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UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 10-Q
(Mark one)

☒ | QUARTERLY REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended March 31, 2024
or

☐ | Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.

For the Transition Period from to .

Commission File Number | 1-15202

W. R. BERKLEY CORPORATION
(Exact name of registrant as specified in its charter)

Delaware |  | 22-1867895
(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification No.)
475 Steamboat Road | Greenwich | Connecticut | 06830
(Address of principal executive offices) |  |  | (Zip Code)

(203) | 629-3000

(Registrant’s telephone number, including area code)

| None |
Former name, former address and former fiscal year, if changed since last report.

Securities registered pursuant to Section 12(b) of the Act:

Title | Trading Symbol | Name
Common Stock, par value $.20 per share | WRB | New York Stock Exchange
5.700% Subordinated Debentures due 2058 | WRB-PE | New York Stock Exchange
5.100% Subordinated Debentures due 2059 | WRB-PF | New York Stock Exchange
4.250% Subordinated Debentures due 2060 | WRB-PG | New York Stock Exchange
4.125% Subordinated Debentures due 2061 | WRB-PH | New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐
1

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer | ☒ |  | Accelerated filer | ☐
Non-accelerated filer | ☐ |  | Smaller reporting company | ☐
|  |  | Emerging growth company | ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒
Number of shares of common stock, $.20 par value, outstanding as of April 29, 2024: 255,662,277

2

TABLE OF CONTENTS

Part I — FINANCIAL INFORMATION
| Item 1. Financial Statements
| Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations
| Item 3. Quantitative and Qualitative Disclosure About Market Risk
| Item 4. Controls and Procedures
PART II — OTHER INFORMATION
| Item 1. Legal Proceedings
| Item 1A. Risk Factors
| Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
| Item 5. Other Information
| Item 6. Exhibits
SIGNATURES
EX-10.1
EX-31.1
EX-31.2
EX-32.1
EX-101 INSTANCE DOCUMENT
EX-101 SCHEMA DOCUMENT
EX-101 CALCULATION LINKBASE DOCUMENT
EX-101 LABELS LINKBASE DOCUMENT
EX-101 PRESENTATION LINKBASE DOCUMENT
EX-101 DEFINITION LINKBASE DOCUMENT

3

Part I — FINANCIAL INFORMATION
Item 1. Financial Statements
W. R. BERKLEY CORPORATION AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS
(In thousands, except share data)

| March 31, 2024 |  | December 31, 2023
| (Unaudited) |  | (Audited)
Assets |  |  |
Investments: |  |  |
Fixed maturity securities (amortized cost of $21,775,516 and $20,915,245; allowance for expected credit losses of $22,869 and $36,751 at March 31, 2024 and December 31, 2023, respectively) | $ | 20,964,854 |  |  | $ | 20,178,308 |
Investment funds | 1,555,818 |  |  | 1,621,655 |
Real estate | 1,273,063 |  |  | 1,249,874 |
Equity securities | 1,178,048 |  |  | 1,090,347 |
Arbitrage trading account | 1,146,119 |  |  | 938,049 |
Loans receivable (net of allowance for expected credit losses of $2,609 and $3,004 at March 31, 2024 and December 31, 2023, respectively) | 228,766 |  |  | 201,271 |
Total investments | 26,346,668 |  |  | 25,279,504 |
Cash and cash equivalents | 1,169,053 |  |  | 1,363,195 |
Premiums and fees receivable (net of allowance for expected credit losses of $35,039 and $35,110 at March 31, 2024 and December 31, 2023, respectively) | 3,171,108 |  |  | 3,109,334 |
Due from reinsurers (net of allowance for expected credit losses of $9,185 and $8,404 at March 31, 2024 and December 31, 2023, respectively) | 3,510,097 |  |  | 3,534,527 |
Deferred policy acquisition costs | 888,719 |  |  | 861,609 |
Prepaid reinsurance premiums | 757,659 |  |  | 758,927 |
Trading account receivables from brokers and clearing organizations | 141,277 |  |  | 303,614 |
Property, furniture and equipment | 466,855 |  |  | 426,803 |
Goodwill | 174,597 |  |  | 174,597 |
Accrued investment income | 217,801 |  |  | 213,408 |
Current and deferred federal and foreign income taxes | 120,754 |  |  | 220,756 |
Other assets | 886,484 |  |  | 865,556 |
Total assets | $ | 37,851,072 |  |  | $ | 37,111,830 |
Liabilities and Equity |  |  |
Liabilities: |  |  |
Reserves for losses and loss expenses | $ | 19,099,628 |  |  | $ | 18,739,652 |
Unearned premiums | 5,996,812 |  |  | 5,922,326 |
Due to reinsurers | 683,508 |  |  | 631,164 |
Trading account securities sold but not yet purchased | 40,298 |  |  | 9,357 |
Other liabilities | 1,395,048 |  |  | 1,503,053 |
Senior notes and other debt | 1,827,997 |  |  | 1,827,951 |
Subordinated debentures | 1,009,269 |  |  | 1,009,090 |
Total liabilities | 30,052,560 |  |  | 29,642,593 |
Equity: |  |  |
Preferred stock, par value $.10 per share: |  |  |
Authorized 5,000,000 shares; issued and outstanding - none | — |  |  | — |
Common stock, par value $.20 per share: |  |  |
Authorized 1,250,000,000 shares; issued and outstanding, net of treasury shares, 256,548,669 and 256,544,757 shares, respectively | 105,803 |  |  | 105,803 |
Additional paid-in capital | 1,030,475 |  |  | 1,017,691 |
Retained earnings | 11,455,158 |  |  | 11,040,908 |
Accumulated other comprehensive loss | (1,023,530) |  |  | (925,838) |
Treasury stock, at cost, 272,465,959 and 272,469,871 shares, respectively | (3,783,074) |  |  | (3,783,133) |
Total stockholders’ equity | 7,784,832 |  |  | 7,455,431 |
Noncontrolling interests | 13,680 |  |  | 13,806 |
Total equity | 7,798,512 |  |  | 7,469,237 |
Total liabilities and equity | $ | 37,851,072 |  |  | $ | 37,111,830 |

See accompanying notes to interim consolidated financial statements.
1

W. R. BERKLEY CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)
(In thousands, except per share data)

| For the Three Months Ended March 31, |  |
| 2024 |  | 2023 |  |  |  |
REVENUES: |  |  |  |  |  |  |
Net premiums written | $ | 2,851,291 |  |  | $ | 2,574,824 |  |  |  |  |
Change in net unearned premiums | (86,944) |  |  | (83,392) |  |  |  |  |
Net premiums earned | 2,764,347 |  |  | 2,491,432 |  |  |  |  |
Net investment income | 319,839 |  |  | 223,398 |  |  |  |  |
Net investment gains: |  |  |  |  |  |  |
Net realized and unrealized gains on investments | 11,503 |  |  | 22,611 |  |  |  |  |
Change in allowance for expected credit losses on investments | 14,277 |  |  | 399 |  |  |  |  |
Net investment gains | 25,780 |  |  | 23,010 |  |  |  |  |
Revenues from non-insurance businesses | 120,992 |  |  | 124,200 |  |  |  |  |
Insurance service fees | 25,319 |  |  | 32,857 |  |  |  |  |
Other income | 496 |  |  | 107 |  |  |  |  |
Total revenues | 3,256,773 |  |  | 2,895,004 |  |  |  |  |
OPERATING COSTS AND EXPENSES: |  |  |  |  |  |  |
Losses and loss expenses | 1,663,778 |  |  | 1,538,755 |  |  |  |  |
Other operating costs and expenses | 868,589 |  |  | 825,575 |  |  |  |  |
Expenses from non-insurance businesses | 118,607 |  |  | 122,767 |  |  |  |  |
Interest expense | 31,728 |  |  | 31,836 |  |  |  |  |
Total operating costs and expenses | 2,682,702 |  |  | 2,518,933 |  |  |  |  |
Income before income taxes | 574,071 |  |  | 376,071 |  |  |  |  |
Income tax expense | (132,036) |  |  | (80,342) |  |  |  |  |
Net income before noncontrolling interests | 442,035 |  |  | 295,729 |  |  |  |  |
Noncontrolling interests | 436 |  |  | (1,603) |  |  |  |  |
Net income to common stockholders | $ | 442,471 |  |  | $ | 294,126 |  |  |  |  |
NET INCOME PER SHARE: |  |  |  |  |  |  |
Basic | $ | 1.65 |  |  | $ | 1.07 |  |  |  |  |
Diluted | $ | 1.64 |  |  | $ | 1.06 |  |  |  |  |

See accompanying notes to interim consolidated financial statements.
2

W. R. BERKLEY CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)
(In thousands)

| For the Three Months Ended March 31, |  |
| 2024 |  | 2023 |  |  |  |
Net income before noncontrolling interests | $ | 442,035 |  |  | $ | 295,729 |  |  |  |  |
Other comprehensive (loss) income: |  |  |  |  |  |  |
Change in unrealized currency translation adjustments | (27,570) |  |  | 4,866 |  |  |  |  |
Change in unrealized investment (losses) gains, net of taxes | (70,122) |  |  | 180,799 |  |  |  |  |
Other comprehensive (loss) income | (97,692) |  |  | 185,665 |  |  |  |  |
Comprehensive income | 344,343 |  |  | 481,394 |  |  |  |  |
Noncontrolling interests | 436 |  |  | (1,602) |  |  |  |  |
Comprehensive income to common stockholders | $ | 344,779 |  |  | $ | 479,792 |  |  |  |  |

See accompanying notes to interim consolidated financial statements.
3

W. R. BERKLEY CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED)
(In thousands, except per share data)

| For the Three Months Ended March 31, |  |
| 2024 |  | 2023 |  |  |  |
COMMON STOCK: |  |  |  |  |  |  |
Beginning and end of period | $ | 105,803 |  |  | $ | 105,803 |  |  |  |  |
ADDITIONAL PAID-IN CAPITAL: |  |  |  |  |  |  |
Beginning of period | $ | 1,017,691 |  |  | $ | 997,534 |  |  |  |  |
Restricted stock units issued | (195) |  |  | (1,200) |  |  |  |  |
Restricted stock units expensed | 12,979 |  |  | 11,794 |  |  |  |  |
End of period | $ | 1,030,475 |  |  | $ | 1,008,128 |  |  |  |  |
RETAINED EARNINGS: |  |  |  |  |  |  |
Beginning of period | $ | 11,040,908 |  |  | $ | 10,161,005 |  |  |  |  |
Net income to common stockholders | 442,471 |  |  | 294,126 |  |  |  |  |
Dividends ($0.11 and $0.60 per share, respectively) | (28,221) |  |  | (158,592) |  |  |  |  |
End of period | $ | 11,455,158 |  |  | $ | 10,296,539 |  |  |  |  |
ACCUMULATED OTHER COMPREHENSIVE LOSS: |  |  |  |  |  |  |
Unrealized investment losses: |  |  |  |  |  |  |
Beginning of period | $ | (586,354) |  |  | $ | (892,905) |  |  |  |  |
Change in unrealized (losses) gains on securities without an allowance for expected credit losses | (71,109) |  |  | 177,342 |  |  |  |  |
Change in unrealized gains on securities with an allowance for expected credit losses | 987 |  |  | 3,456 |  |  |  |  |
End of period | (656,476) |  |  | (712,107) |  |  |  |  |
Currency translation adjustments: |  |  |  |  |  |  |
Beginning of period | (339,484) |  |  | (371,676) |  |  |  |  |
Net change in period | (27,570) |  |  | 4,866 |  |  |  |  |
End of period | (367,054) |  |  | (366,810) |  |  |  |  |
Total accumulated other comprehensive loss | $ | (1,023,530) |  |  | $ | (1,078,917) |  |  |  |  |
TREASURY STOCK: |  |  |  |  |  |  |
Beginning of period | $ | (3,783,133) |  |  | $ | (3,251,429) |  |  |  |  |
Stock exercised/vested | 59 |  |  | 395 |  |  |  |  |
Stock repurchased | — |  |  | (135,152) |  |  |  |  |
Other | — |  |  | (1,352) |  |  |  |  |
End of period | $ | (3,783,074) |  |  | $ | (3,387,538) |  |  |  |  |
NONCONTROLLING INTERESTS: |  |  |  |  |  |  |
Beginning of period | $ | 13,806 |  |  | $ | 19,829 |  |  |  |  |
Contributions | 310 |  |  | 177 |  |  |  |  |
Net (loss) income | (436) |  |  | 1,603 |  |  |  |  |
Other comprehensive loss, net of tax | — |  |  | (1) |  |  |  |  |
End of period | $ | 13,680 |  |  | $ | 21,608 |  |  |  |  |

See accompanying notes to interim consolidated financial statements.
4

W. R. BERKLEY CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)
(In thousands)

| For the Three Months Ended March 31,
| 2024 |  | 2023
CASH FROM OPERATING ACTIVITIES: |  |  |
Net income to common stockholders | $ | 442,471 |  |  | $ | 294,126 |
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Net investment gains | (25,780) |  |  | (23,010) |
Depreciation and (accretion) amortization | (80,784) |  |  | 9,737 |
Noncontrolling interests | (436) |  |  | 1,603 |
Investment funds | 29,349 |  |  | (2,180) |
Stock incentive plans | 12,979 |  |  | 11,793 |
Change in: |  |  |
Arbitrage trading account | (14,793) |  |  | (14,879) |
Premiums and fees receivable | (68,133) |  |  | (33,460) |
Reinsurance accounts | 81,684 |  |  | (84,746) |
Deferred policy acquisition costs | (28,283) |  |  | (23,727) |
Income taxes | 120,052 |  |  | 76,933 |
Reserves for losses and loss expenses | 393,176 |  |  | 424,149 |
Unearned premiums | 84,952 |  |  | 87,991 |
Other | (200,219) |  |  | (279,007) |
Net cash from operating activities | 746,235 |  |  | 445,323 |
CASH USED IN INVESTING ACTIVITIES: |  |  |
Proceeds from sale of fixed maturity securities | 426,084 |  |  | 429,400 |
Proceeds from sale of equity securities | 83,987 |  |  | 9,933 |
Distributions from investment funds | 31,238 |  |  | 7,518 |
Proceeds from maturities and prepayments of fixed maturity securities | 968,330 |  |  | 956,308 |
Purchase of fixed maturity securities | (2,266,087) |  |  | (1,686,107) |
Purchase of equity securities | (105,599) |  |  | (59,529) |
Real estate (purchased) sold | (30,697) |  |  | 7,472 |
Change in loans receivable | (28,150) |  |  | 612 |
Net purchases of property, furniture and equipment | (54,335) |  |  | (11,532) |
Change in balances due to security brokers | 70,120 |  |  | (13,598) |
Other | — |  |  | 93 |
Net cash used in investing activities | (905,109) |  |  | (359,430) |
CASH USED IN FINANCING ACTIVITIES: |  |  |
Net proceeds (payments) from issuance of debt | 20 |  |  | (868) |
Cash dividends to common stockholders | (28,220) |  |  | (158,592) |
Purchase of common treasury shares | — |  |  | (135,152) |
Other, net | (1,505) |  |  | (1,114) |
Net cash used in financing activities | (29,705) |  |  | (295,726) |
Net impact on cash due to change in foreign exchange rates | (5,563) |  |  | 2,844 |
Net change in cash and cash equivalents | (194,142) |  |  | (206,989) |
Cash and cash equivalents at beginning of period | 1,363,195 |  |  | 1,449,346 |
Cash and cash equivalents at end of period | $ | 1,169,053 |  |  | $ | 1,242,357 |

See accompanying notes to interim consolidated financial statements.
5

W. R. Berkley Corporation and Subsidiaries
NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)
(1) General
The unaudited consolidated financial statements, which include the accounts of W. R. Berkley Corporation and its subsidiaries (the “Company”), have been prepared on the basis of U.S. generally accepted accounting principles (“GAAP”) for interim financial information. Accordingly, they do not include all the information and notes required by GAAP for annual financial statements. The unaudited consolidated financial statements reflect all adjustments, consisting only of normal recurring items, which are necessary to present fairly the Company’s financial position and results of operations on a basis consistent with the prior audited consolidated financial statements. Operating results for interim periods are not necessarily indicative of the results that may be expected for the year. All significant intercompany accounts and transactions have been eliminated.
The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the revenues and expenses reflected during the reporting period. For further information related to areas of judgment and estimates and other information necessary to understand the Company’s financial position and results of operations, refer to the audited consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023.
Reclassifications have been made in the 2023 financial statements as originally reported to conform to the presentation of the 2024 financial statements. The Company reclassified a program management business from the Insurance segment to the Reinsurance & Monoline Excess segment. The reclassified business is a program management business offering support on a nationwide basis for commercial casualty and property program administrators.
The income tax provision has been computed based on the Company’s estimated annual effective tax rate. The effective income tax rate differs from the federal income tax rate of 21% primarily due to the geographical mix of earnings and larger amounts being subject to tax at a rate greater than the U.S. statutory rate, which was partially offset by tax benefits related to tax-exempt investment income.
(2) Per Share Data
The Company presents both basic and diluted net income per share (“EPS”) amounts. Basic EPS is calculated by dividing net income by the weighted average number of common shares outstanding during the period (including 11,663,450 and 11,416,856 common shares held in a grantor trust as of March 31, 2024 and 2023, respectively). The common shares held in the grantor trust are for delivery upon settlement of vested but mandatorily deferred restricted stock units ("RSUs"). Shares held by the grantor trust do not affect diluted shares outstanding since the shares deliverable under vested RSUs were already included in diluted shares outstanding. Diluted EPS is based upon the weighted average number of basic and common equivalent shares outstanding during the period and is calculated using the treasury stock method for stock incentive plans. Common equivalent shares are excluded from the computation in periods in which they have an anti-dilutive effect.
The weighted average number of common shares used in the computation of basic and diluted earnings per share was as follows:

| For the Three Months Ended March 31, |  |
(In thousands) | 2024 |  | 2023 |  |  |  |
Basic | 268,211 |  |  | 274,977 |  |  |  |  |
Diluted | 270,505 |  |  | 277,339 |  |  |  |  |

(3) Recent Accounting Pronouncements and Accounting Policies
Recently adopted accounting pronouncements:
All accounting and reporting standards that became effective in 2024 were either not applicable to the Company or their adoption did not have a material impact on the Company.
6

Accounting and reporting standards that are not yet effective:
All recently issued but not yet effective accounting and reporting standards are either not applicable to the Company or are not expected to have a material impact on the Company.
7

(4) Consolidated Statements of Comprehensive (Loss) Income
The following table presents the components of the changes in accumulated other comprehensive (loss) income ("AOCI"):

(In thousands) | Unrealized Investment (Losses) Gains |  | Currency Translation Adjustments |  |  | Accumulated Other Comprehensive (Loss) Income |
As of and for the three months ended March 31, 2024 |  |  |  |  |  |
Changes in AOCI |  |  |  |  |  |
Beginning of period | $ | (586,354) |  |  | $ | (339,484) |  |  |  | $ | (925,838) |  |
Other comprehensive loss before reclassifications | (101,312) |  |  | (27,570) |  |  |  | (128,882) |  |
Amounts reclassified from AOCI | 31,190 |  |  | — |  |  |  | 31,190 |  |
Other comprehensive loss | (70,122) |  |  | (27,570) |  |  |  | (97,692) |  |
Unrealized investment loss related to noncontrolling interest | — |  |  | — |  |  |  | — |  |
End of period | $ | (656,476) |  |  | $ | (367,054) |  |  |  | $ | (1,023,530) |  |
Amounts reclassified from AOCI |  |  |  |  |  |  |
Pre-tax | $ | 39,481 |  | (1) | $ | — |  |  |  | $ | 39,481 |  |
Tax effect | (8,291) |  | (2) | — |  |  |  | (8,291) |  |
After-tax amounts reclassified | $ | 31,190 |  |  | $ | — |  |  |  | $ | 31,190 |  |
Other comprehensive loss |  |  |  |  |  |  |
Pre-tax | $ | (89,297) |  |  | $ | (27,570) |  |  |  | $ | (116,867) |  |
Tax effect | 19,175 |  |  | — |  |  |  | 19,175 |  |
Other comprehensive loss | $ | (70,122) |  |  | $ | (27,570) |  |  |  | $ | (97,692) |  |
As of and for the three months ended March 31, 2023 |  |  |  |  |  |
Changes in AOCI |  |  |  |  |  |
Beginning of period | $ | (892,905) |  |  | $ | (371,676) |  |  |  | $ | (1,264,581) |  |
Other comprehensive income before reclassifications | 155,215 |  |  | 4,866 |  |  |  | 160,081 |  |
Amounts reclassified from AOCI | 25,584 |  |  | — |  |  |  | 25,584 |  |
Other comprehensive income | 180,799 |  |  | 4,866 |  |  |  | 185,665 |  |
Unrealized investment loss related to noncontrolling interest | (1) |  |  | — |  |  |  | (1) |  |
Ending balance | $ | (712,107) |  |  | $ | (366,810) |  |  |  | $ | (1,078,917) |  |
Amounts reclassified from AOCI |  |  |  |  |  |  |
Pre-tax | $ | 32,385 |  | (1) | $ | — |  |  |  | $ | 32,385 |  |
Tax effect | (6,801) |  | (2) | — |  |  |  | (6,801) |  |
After-tax amounts reclassified | $ | 25,584 |  |  | $ | — |  |  |  | $ | 25,584 |  |
Other comprehensive income |  |  |  |  |  |  |
Pre-tax | $ | 232,021 |  |  | $ | 4,866 |  |  |  | $ | 236,887 |  |
Tax effect | (51,222) |  |  | — |  |  |  | (51,222) |  |
Other comprehensive income | $ | 180,799 |  |  | $ | 4,866 |  |  |  | $ | 185,665 |  |

____________
(1) Net investment gains in the consolidated statements of income.
(2) Income tax expense in the consolidated statements of income.
(5) Statements of Cash Flows
Interest payments were $28,577,000 and $41,150,000 for the three months ended March 31, 2024 and 2023, respectively. There were no income taxes paid for the three months ended March 31, 2024 and 2023, respectively.
8

(6) Investments in Fixed Maturity Securities
At March 31, 2024 and December 31, 2023, investments in fixed maturity securities were as follows:

(In thousands) | Amortized Cost |  | Allowance for Expected Credit Losses (1) |  | Gross Unrealized |  | Fair Value |  | Carrying Value
Gains |  | Losses |
March 31, 2024 |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |
State and municipal | $ | 51,258 |  |  | $ | (38) |  |  | $ | 2,276 |  |  | $ | — |  |  | $ | 53,496 |  |  | $ | 51,220 |
Residential mortgage-backed | 2,762 |  |  | — |  |  | 82 |  |  | — |  |  | 2,844 |  |  | 2,762 |
Total held to maturity | 54,020 |  |  | (38) |  |  | 2,358 |  |  | — |  |  | 56,340 |  |  | 53,982 |
Available for sale: |  |  |  |  |  |  |  |  |  |  |
U.S. government and government agency | 1,875,920 |  |  | — |  |  | 8,888 |  |  | (55,256) |  |  | 1,829,552 |  |  | 1,829,552 |
State and municipal: |  |  |  |  |  |  |  |  |  |  |
Special revenue | 1,626,511 |  |  | — |  |  | 3,370 |  |  | (83,769) |  |  | 1,546,112 |  |  | 1,546,112 |
State general obligation | 393,807 |  |  | — |  |  | 1,833 |  |  | (16,316) |  |  | 379,324 |  |  | 379,324 |
Pre-refunded | 88,359 |  |  | — |  |  | 908 |  |  | (214) |  |  | 89,053 |  |  | 89,053 |
Corporate backed | 166,261 |  |  | (693) |  |  | 539 |  |  | (10,588) |  |  | 155,519 |  |  | 155,519 |
Local general obligation | 393,482 |  |  | — |  |  | 2,298 |  |  | (13,002) |  |  | 382,778 |  |  | 382,778 |
Total state and municipal | 2,668,420 |  |  | (693) |  |  | 8,948 |  |  | (123,889) |  |  | 2,552,786 |  |  | 2,552,786 |
Mortgage-backed: |  |  |  |  |  |  |  |  |  |  |
Residential | 1,963,060 |  |  | — |  |  | 9,805 |  |  | (174,727) |  |  | 1,798,138 |  |  | 1,798,138 |
Commercial | 630,348 |  |  | (562) |  |  | 326 |  |  | (20,232) |  |  | 609,880 |  |  | 609,880 |
Total mortgage-backed | 2,593,408 |  |  | (562) |  |  | 10,131 |  |  | (194,959) |  |  | 2,408,018 |  |  | 2,408,018 |
Asset-backed | 4,298,768 |  |  | (1,097) |  |  | 6,475 |  |  | (64,585) |  |  | 4,239,561 |  |  | 4,239,561 |
Corporate: |  |  |  |  |  |  |  |  |  |  |
Industrial | 3,865,664 |  |  | — |  |  | 14,741 |  |  | (146,130) |  |  | 3,734,275 |  |  | 3,734,275 |
Financial | 3,172,945 |  |  | — |  |  | 10,100 |  |  | (69,749) |  |  | 3,113,296 |  |  | 3,113,296 |
Utilities | 751,234 |  |  | — |  |  | 2,864 |  |  | (24,436) |  |  | 729,662 |  |  | 729,662 |
Other | 590,644 |  |  | — |  |  | 2,516 |  |  | (7,690) |  |  | 585,470 |  |  | 585,470 |
Total corporate | 8,380,487 |  |  | — |  |  | 30,221 |  |  | (248,005) |  |  | 8,162,703 |  |  | 8,162,703 |
Foreign government | 1,904,493 |  |  | (20,479) |  |  | 8,585 |  |  | (174,347) |  |  | 1,718,252 |  |  | 1,718,252 |
Total available for sale | 21,721,496 |  |  | (22,831) |  |  | 73,248 |  |  | (861,041) |  |  | 20,910,872 |  |  | 20,910,872 |
Total investments in fixed maturity securities | $ | 21,775,516 |  |  | $ | (22,869) |  |  | $ | 75,606 |  |  | $ | (861,041) |  |  | $ | 20,967,212 |  |  | $ | 20,964,854 |

____________
(1) Represents the amount of impairment that has resulted from credit-related factors. The change in the allowance for expected credit losses is recognized in the consolidated statements of income. Amount excludes unrealized losses relating to non-credit factors.
9

(In thousands) | Amortized Cost |  | Allowance for Expected Credit Losses (1) |  | Gross Unrealized |  | Fair Value |  | Carrying Value |  |
| Gains |  | Losses |  |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
State and municipal | $ | 50,547 |  |  | $ | (43) |  |  | $ | 3,132 |  |  | $ | — |  |  | $ | 53,636 |  |  | $ | 50,504 |  |  |
Residential mortgage-backed | 2,868 |  |  | — |  |  | 107 |  |  | — |  |  | 2,975 |  |  | 2,868 |  |  |
Total held to maturity | 53,415 |  |  | (43) |  |  | 3,239 |  |  | — |  |  | 56,611 |  |  | 53,372 |  |  |
Available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and government agency | 1,762,997 |  |  | — |  |  | 11,403 |  |  | (57,669) |  |  | 1,716,731 |  |  | 1,716,731 |  |  |
State and municipal: |  |  |  |  |  |  |  |  |  |  |  |  |
Special revenue | 1,682,550 |  |  | — |  |  | 5,651 |  |  | (82,006) |  |  | 1,606,195 |  |  | 1,606,195 |  |  |
State general obligation | 394,429 |  |  | — |  |  | 3,550 |  |  | (16,405) |  |  | 381,574 |  |  | 381,574 |  |  |
Pre-refunded | 103,029 |  |  | — |  |  | 1,634 |  |  | (185) |  |  | 104,478 |  |  | 104,478 |  |  |
Corporate backed | 166,873 |  |  | (757) |  |  | 696 |  |  | (11,973) |  |  | 154,839 |  |  | 154,839 |  |  |
Local general obligation | 396,041 |  |  | — |  |  | 3,188 |  |  | (11,893) |  |  | 387,336 |  |  | 387,336 |  |  |
Total state and municipal | 2,742,922 |  |  | (757) |  |  | 14,719 |  |  | (122,462) |  |  | 2,634,422 |  |  | 2,634,422 |  |  |
Mortgage-backed: |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | 1,773,206 |  |  | — |  |  | 12,780 |  |  | (163,844) |  |  | 1,622,142 |  |  | 1,622,142 |  |  |
Commercial | 657,157 |  |  | (158) |  |  | 626 |  |  | (13,312) |  |  | 644,313 |  |  | 644,313 |  |  |
Total mortgage-backed | 2,430,363 |  |  | (158) |  |  | 13,406 |  |  | (177,156) |  |  | 2,266,455 |  |  | 2,266,455 |  |  |
Asset-backed | 4,252,883 |  |  | (1,164) |  |  | 8,527 |  |  | (73,206) |  |  | 4,187,040 |  |  | 4,187,040 |  |  |
Corporate: |  |  |  |  |  |  |  |  |  |  |  |  |
Industrial | 3,679,219 |  |  | (40) |  |  | 24,312 |  |  | (143,936) |  |  | 3,559,555 |  |  | 3,559,555 |  |  |
Financial | 2,838,220 |  |  | (4,986) |  |  | 14,681 |  |  | (68,681) |  |  | 2,779,234 |  |  | 2,779,234 |  |  |
Utilities | 701,865 |  |  | — |  |  | 6,471 |  |  | (23,412) |  |  | 684,924 |  |  | 684,924 |  |  |
Other | 635,975 |  |  | — |  |  | 1,605 |  |  | (7,234) |  |  | 630,346 |  |  | 630,346 |  |  |
Total corporate | 7,855,279 |  |  | (5,026) |  |  | 47,069 |  |  | (243,263) |  |  | 7,654,059 |  |  | 7,654,059 |  |  |
Foreign government | 1,817,386 |  |  | (29,603) |  |  | 15,865 |  |  | (137,419) |  |  | 1,666,229 |  |  | 1,666,229 |  |  |
Total available for sale | 20,861,830 |  |  | (36,708) |  |  | 110,989 |  |  | (811,175) |  |  | 20,124,936 |  |  | 20,124,936 |  |  |
Total investments in fixed maturity securities | $ | 20,915,245 |  |  | $ | (36,751) |  |  | $ | 114,228 |  |  | $ | (811,175) |  |  | $ | 20,181,547 |  |  | $ | 20,178,308 |  |  |

____________
(1) Represents the amount of impairment that has resulted from credit-related factors. The change in the allowance for expected credit losses is recognized in the consolidated statements of income. Amount excludes unrealized losses relating to non-credit factors.
The following table presents the rollforward of the allowance for expected credit losses for held to maturity securities for the three months ended March 31, 2024 and 2023:

(In thousands) | 2024 |  | 2023
Allowance for expected credit losses, beginning of period | $ | 43 |  |  | $ | 114 |
Provision for expected credit losses | (5) |  |  | (7) |
Allowance for expected credit losses, end of period | $ | 38 |  |  | $ | 107 |

The following table presents the rollforward of the allowance for expected credit losses for available for sale securities for the three months ended March 31, 2024 and 2023:
10

| 2024 |  | 2023
(In thousands) | Foreign Government |  | Corporate |  | Mortgage-backed |  | Asset-backed |  | State and Municipal |  | Total |  | Foreign Government |  | Corporate |  | Mortgage-backed |  | Total
Allowance for expected credit losses, beginning of period | $ | 29,603 |  |  | $ | 5,026 |  |  | $ | 158 |  |  | $ | 1,164 |  |  | $ | 757 |  |  | $ | 36,708 |  |  | $ | 32,633 |  |  | $ | 4,701 |  |  | $ | 18 |  |  | $ | 37,352 |
Expected credit losses on securities for which credit losses were not previously recorded | — |  |  | — |  |  | 562 |  |  | — |  |  | — |  |  | 562 |  |  | — |  |  | 186 |  |  | — |  |  | 186 |
Expected credit (gains) losses on securities for which credit losses were previously recorded | (9,124) |  |  | (5,026) |  |  | (158) |  |  | (67) |  |  | (64) |  |  | (14,439) |  |  | 691 |  |  | (1,087) |  |  | 5 |  |  | (391) |
Reduction due to disposals | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (5) |  |  | — |  |  | (5) |
Allowance for expected credit losses, end of period | $ | 20,479 |  |  | $ | — |  |  | $ | 562 |  |  | $ | 1,097 |  |  | $ | 693 |  |  | $ | 22,831 |  |  | $ | 33,324 |  |  | $ | 3,795 |  |  | $ | 23 |  |  | $ | 37,142 |

During the three months ended March 31, 2024, the Company decreased the allowance for expected credit losses for available for sale securities utilizing its credit loss assessment process and inputs used in its credit loss model, primarily due to improved pricing associated with foreign government securities and corporate securities. During the three months ended March 31, 2023, the Company decreased the allowance for expected credit losses for available for sale securities utilizing its credit loss assessment process and inputs used in its credit loss model due to a decrease in unrealized losses primarily associated with corporate securities.
The amortized cost and fair value of fixed maturity securities at March 31, 2024, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because certain issuers may have the right to call or prepay obligations.

(In thousands) | Amortized Cost (1) |  | Fair Value |  |  |  |  |  |  |  |
Due in one year or less | $ | 1,980,563 |  |  | $ | 1,907,003 |  |  |  |  |  |  |  |  |
Due after one year through five years | 9,877,133 |  |  | 9,528,047 |  |  |  |  |  |  |  |  |
Due after five years through ten years | 4,681,226 |  |  | 4,577,859 |  |  |  |  |  |  |  |  |
Due after ten years | 2,640,386 |  |  | 2,543,441 |  |  |  |  |  |  |  |  |
Mortgage-backed securities | 2,596,170 |  |  | 2,410,862 |  |  |  |  |  |  |  |  |
Total | $ | 21,775,478 |  |  | $ | 20,967,212 |  |  |  |  |  |  |  |  |

________________
(1) Amortized cost is reduced by the allowance for expected credit losses of $38 thousand related to held to maturity securities.
At March 31, 2024 and December 31, 2023, there were no investments that exceeded 10% of common stockholders' equity, other than investments in United States government and government agency securities.
11

(7) Investments in Equity Securities
At March 31, 2024 and December 31, 2023, investments in equity securities were as follows:

(In thousands) | Cost |  | Gross Unrealized |  | Fair Value |  | Carrying Value
Gains |  | Losses |
March 31, 2024 |  |  |  |  |  |  |  |  |
Common stocks | $ | 671,958 |  |  | $ | 196,093 |  |  | $ | (21,382) |  |  | $ | 846,669 |  |  | $ | 846,669 |
Preferred stocks | 339,263 |  |  | 8,491 |  |  | (16,375) |  |  | 331,379 |  |  | 331,379 |
Total | $ | 1,011,221 |  |  | $ | 204,584 |  |  | $ | (37,757) |  |  | $ | 1,178,048 |  |  | $ | 1,178,048 |
December 31, 2023 |  |  |  |  |  |  |  |  |
Common stocks | $ | 664,997 |  |  | $ | 191,806 |  |  | $ | (18,749) |  |  | $ | 838,054 |  |  | $ | 838,054 |
Preferred stocks | 284,335 |  |  | 3,075 |  |  | (35,117) |  |  | 252,293 |  |  | 252,293 |
Total | $ | 949,332 |  |  | $ | 194,881 |  |  | $ | (53,866) |  |  | $ | 1,090,347 |  |  | $ | 1,090,347 |

(8) Arbitrage Trading Account
At March 31, 2024 and December 31, 2023, the fair and carrying values of the arbitrage trading account were $1,146 million and $938 million, respectively. The primary focus of the trading account is merger arbitrage. Merger arbitrage is the business of investing in the securities of publicly held companies which are the targets in announced tender offers and mergers. Arbitrage investing differs from other types of investing in its focus on transactions and events believed likely to bring about a change in value over a relatively short time period (usually four months or less).
The Company uses put options and call options in order to mitigate the impact of potential changes in market conditions on the merger arbitrage trading account. These options are reported at fair value. As of March 31, 2024, the fair value of long option contracts outstanding was $117 thousand (notional amount of $162 million) and the fair value of short option contracts was $40 million (notional amount of $162 million). Other than with respect to the use of these trading account securities, the Company does not make use of derivatives.
(9) Net Investment Income
Net investment income consisted of the following:

| For the Three Months Ended March 31, |  |
(In thousands) | 2024 |  | 2023 |  |  |  |
Investment income (loss) earned on: |  |  |  |  |  |  |
Fixed maturity securities, including cash and cash equivalents and loans receivable | $ | 335,248 |  |  | $ | 195,642 |  |  |  |  |
Arbitrage trading account (1) | 18,011 |  |  | 18,256 |  |  |  |  |
Equity securities | 11,336 |  |  | 13,746 |  |  |  |  |
Investment funds | (29,349) |  |  | 2,180 |  |  |  |  |
Real estate | (13,163) |  |  | (3,711) |  |  |  |  |
Gross investment income | 322,083 |  |  | 226,113 |  |  |  |  |
Investment expense | (2,244) |  |  | (2,715) |  |  |  |  |
Net investment income | $ | 319,839 |  |  | $ | 223,398 |  |  |  |  |

(1) Net investment income includes earnings from trading account receivables from brokers and clearing organizations.
12

(10) Investment Funds
The Company evaluates whether it is an investor in a variable interest entity ("VIE"). Such entities do not have sufficient equity at risk to finance their activities without additional subordinated financial support, or the equity investors, as a group, do not have the characteristics of a controlling financial interest (primary beneficiary). The Company determines whether it is the primary beneficiary of an entity subject to consolidation based on a qualitative assessment of the VIE's capital structure, contractual terms, nature of the VIE's operations and purpose, and the Company's relative exposure to the related risks of the VIE on the date it becomes initially involved in the VIE and on an ongoing basis. The Company is not the primary beneficiary in any of its investment funds, and accordingly, carries its interests in investment funds under the equity method of accounting.
The Company’s maximum exposure to loss with respect to these investments is limited to the carrying amount reported on the Company’s consolidated balance sheet and its unfunded commitments, which were $309 million as of March 31, 2024.
Investment funds consisted of the following:

| Carrying Value as of |  | Income (Loss) from Investment Funds
| March 31, |  | December 31, |  | For the Three Months Ended March 31,
(In thousands) | 2024 |  | 2023 |  | 2024 |  | 2023
Financial services | $ | 418,877 |  |  | $ | 433,407 |  |  | $ | (13,491) |  |  | $ | (13,047) |
Transportation | 296,021 |  |  | 344,278 |  |  | (28,661) |  |  | 11,788 |
Real Estate | 189,309 |  |  | 201,625 |  |  | 5,356 |  |  | 956 |
Infrastructure | 137,201 |  |  | 130,589 |  |  | 5,039 |  |  | 3,355 |
Energy | 134,195 |  |  | 114,794 |  |  | 8,632 |  |  | 3,439 |
Other funds | 380,215 |  |  | 396,962 |  |  | (6,224) |  |  | (4,311) |
Total | $ | 1,555,818 |  |  | $ | 1,621,655 |  |  | $ | (29,349) |  |  | $ | 2,180 |

The Company's share of the earnings or losses from investment funds is generally reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.
Financial services investment funds include the minority investment in Lifson Re, a Bermuda reinsurance company. Effective January 1, 2021, Lifson Re participated on a fully collateralized basis in a majority of the Company’s reinsurance placements for a 22.5% share of placed amounts. The percentage increased from 22.5% to 30.0% effective July 1, 2022. This pertains to all traditional reinsurance/retrocessional placements for both property and casualty business where there is more than one open market reinsurer participating. For the three months ended March 31, 2024 and 2023, the Company ceded approximately $94 million and $107 million, respectively, of written premiums to Lifson Re.
Other funds include deferred compensation trust assets of $41 million and $36 million as of March 31, 2024 and December 31, 2023, respectively. These assets support other liabilities reflected in the balance sheet of an equal amount for employees who have elected to defer a portion of their compensation. The change in the net asset value of the trust is recorded in other funds within net investment income with an offsetting equal amount within corporate expenses.
(11) Real Estate
Investment in real estate represents directly owned property held for investment, as follows:

| Carrying Value
| March 31, |  | December 31,
(In thousands) | 2024 |  | 2023
Properties in operation | $ | 1,045,712 |  |  | $ | 1,022,654 |
Properties under development | 227,351 |  |  | 227,220 |
Total | $ | 1,273,063 |  |  | $ | 1,249,874 |

As of March 31, 2024, properties in operation included a long-term ground lease in Washington, D.C., an office complex in New York City and the completed portion of a mixed-use project in Washington D.C. Properties in operation are net of accumulated depreciation and amortization of $34,131,000 and $32,745,000 as of March 31, 2024 and December 31, 2023, respectively. Related depreciation expense was $1,941,000 and $2,281,000 for the three months ended March 31, 2024
13

and 2023, respectively. Future minimum rental income expected on operating leases relating to properties in operation is $25,874,266 in 2024, $33,742,431 in 2025, $31,539,135 in 2026, $30,794,160 in 2027, $31,352,156 in 2028, $26,899,553 in 2029 and $413,976,622 thereafter.
A mixed-use project in Washington, D.C. had been under development in 2024 and 2023, with the completed portion reported in properties in operation as of March 31, 2024.
(12) Loans Receivable
At March 31, 2024 and December 31, 2023, loans receivable were as follows:

(In thousands) | March 31, 2024 |  | December 31, 2023
Amortized cost (net of allowance for expected credit losses): |  |  |
Real estate loans | $ | 227,431 |  |  | $ | 200,381 |
Commercial loans | 1,335 |  |  | 890 |
Total | $ | 228,766 |  |  | $ | 201,271 |
Fair value: |  |  |
Real estate loans | $ | 227,821 |  |  | $ | 197,354 |
Commercial loans | 1,335 |  |  | 890 |
Total | $ | 229,156 |  |  | $ | 198,244 |

The real estate loans are secured by commercial and residential real estate primarily located in the UK and New York. These loans generally earn interest at fixed or stepped interest rates and have maturities through 2026. The commercial loans are with small business owners who have secured the related financing with the assets of the business. Commercial loans primarily earn interest on a fixed basis and have varying maturities generally not exceeding 10 years.
The following table presents the rollforward of the allowance for expected credit losses for loans receivable for the three months ended March 31, 2024 and 2023:

| 2024 |  | 2023
(In thousands) | Real Estate Loans |  | Commercial Loans |  | Total |  | Real Estate Loans |  | Commercial Loans |  | Total
Allowance for expected credit losses, beginning of period | $ | 2,983 |  |  | $ | 21 |  |  | $ | 3,004 |  |  | $ | 1,100 |  |  | $ | 691 |  |  | $ | 1,791 |
Change in expected credit losses | (396) |  |  | 1 |  |  | (395) |  |  | (61) |  |  | (121) |  |  | (182) |
Allowance for expected credit losses, end of period | $ | 2,587 |  |  | $ | 22 |  |  | $ | 2,609 |  |  | $ | 1,039 |  |  | $ | 570 |  |  | $ | 1,609 |

The Company monitors the performance of its loans receivable and assesses the ability of the borrower to pay principal and interest based upon loan structure, underlying property values, cash flow and related financial and operating performance of the property and market conditions.
In evaluating the real estate loans, the Company considers their credit quality indicators, including loan to value ratios, which compare the outstanding loan amount to the estimated value of the property, the borrower’s financial condition and performance with respect to loan terms, the position in the capital structure, the overall leverage in the capital structure and other market conditions.
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(13) Net Investment Gains
Net investment gains were as follows:

| For the Three Months Ended March 31, |  |
(In thousands) | 2024 |  | 2023 |  |  |  |
Net investment gains: |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |
Gains | $ | 3,557 |  |  | $ | 943 |  |  |  |  |
Losses | (2,323) |  |  | (18,130) |  |  |  |  |
Equity securities (1): |  |  |  |  |  |  |
Net realized gains on investment sales | 40,277 |  |  | 1,060 |  |  |  |  |
Change in unrealized gains | 25,812 |  |  | 43,404 |  |  |  |  |
Investment funds | 993 |  |  | 10 |  |  |  |  |
Real estate | (2,216) |  |  | 10,739 |  |  |  |  |
Loans receivable | — |  |  | — |  |  |  |  |
Other (2) | (54,597) |  |  | (15,415) |  |  |  |  |
Net realized and unrealized gains on investments in earnings before allowance for expected credit losses | 11,503 |  |  | 22,611 |  |  |  |  |
Change in allowance for expected credit losses on investments: |  |  |  |  |  |  |
Fixed maturity securities | 13,882 |  |  | 217 |  |  |  |  |
Loans receivable | 395 |  |  | 182 |  |  |  |  |
Change in allowance for expected credit losses on investments | 14,277 |  |  | 399 |  |  |  |  |
Net investment gains | 25,780 |  |  | 23,010 |  |  |  |  |
Income tax expense | (6,633) |  |  | (4,850) |  |  |  |  |
After-tax net investment gains | $ | 19,147 |  |  | $ | 18,160 |  |  |  |  |

Change in unrealized investment (losses) gains on available for sale securities: |  |  |  |  |  |  |
Fixed maturity securities without allowance for expected credit losses | $ | (88,594) |  |  | $ | 227,116 |  |  |  |  |
Fixed maturity securities with allowance for expected credit losses | 987 |  |  | 3,456 |  |  |  |  |
Investment funds | (1,703) |  |  | 1,936 |  |  |  |  |
Other | 13 |  |  | (487) |  |  |  |  |
Total change in unrealized investment (losses) gains | (89,297) |  |  | 232,021 |  |  |  |  |
Income tax benefit (expense) | 19,175 |  |  | (51,222) |  |  |  |  |
Noncontrolling interests | — |  |  | (1) |  |  |  |  |
After-tax change in unrealized investment (losses) gains of available for sale securities | $ | (70,122) |  |  | $ | 180,798 |  |  |  |  |

______________________
(1) The net realized gains or losses on investment sales represent the total gains or losses from the purchase dates of the equity securities. The change in unrealized gains (losses) consists of two components: (i) the reversal of the gain or loss recognized in previous periods on equity securities sold and (ii) the change in unrealized gain or loss resulting from mark-to-market adjustments on equity securities still held.
(2) Primarily relates to realized foreign currency losses upon the disposition of fixed maturity securities.
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(14) Fixed Maturity Securities in an Unrealized Loss Position
The following tables summarize all fixed maturity securities in an unrealized loss position at March 31, 2024 and December 31, 2023 by the length of time those securities have been continuously in an unrealized loss position:

| Less Than 12 Months |  | 12 Months or Greater |  | Total
(In thousands) | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
March 31, 2024 |  |  |  |  |  |  |  |  |  |  |
U.S. government and government agency | $ | 439,699 |  |  | $ | 6,725 |  |  | $ | 666,947 |  |  | $ | 48,531 |  |  | $ | 1,106,646 |  |  | $ | 55,256 |
State and municipal | 308,609 |  |  | 3,376 |  |  | 1,764,296 |  |  | 120,513 |  |  | 2,072,905 |  |  | 123,889 |
Mortgage-backed | 288,696 |  |  | 5,023 |  |  | 1,374,227 |  |  | 189,936 |  |  | 1,662,923 |  |  | 194,959 |
Asset-backed | 1,055,695 |  |  | 3,765 |  |  | 1,282,145 |  |  | 60,820 |  |  | 2,337,840 |  |  | 64,585 |
Corporate | 1,532,300 |  |  | 16,754 |  |  | 4,372,753 |  |  | 231,251 |  |  | 5,905,053 |  |  | 248,005 |
Foreign government | 321,236 |  |  | 5,078 |  |  | 754,322 |  |  | 169,269 |  |  | 1,075,558 |  |  | 174,347 |
Fixed maturity securities | $ | 3,946,235 |  |  | $ | 40,721 |  |  | $ | 10,214,690 |  |  | $ | 820,320 |  |  | $ | 14,160,925 |  |  | $ | 861,041 |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |
U.S. government and government agency | $ | 384,392 |  |  | $ | 6,655 |  |  | $ | 614,623 |  |  | $ | 51,014 |  |  | $ | 999,015 |  |  | $ | 57,669 |
State and municipal | 264,273 |  |  | 3,013 |  |  | 1,680,034 |  |  | 119,449 |  |  | 1,944,307 |  |  | 122,462 |
Mortgage-backed | 278,819 |  |  | 2,025 |  |  | 1,360,748 |  |  | 175,131 |  |  | 1,639,567 |  |  | 177,156 |
Asset-backed | 413,511 |  |  | 2,070 |  |  | 2,176,035 |  |  | 71,136 |  |  | 2,589,546 |  |  | 73,206 |
Corporate | 874,754 |  |  | 11,975 |  |  | 4,418,309 |  |  | 231,288 |  |  | 5,293,063 |  |  | 243,263 |
Foreign government | 204,908 |  |  | 1,758 |  |  | 794,174 |  |  | 135,661 |  |  | 999,082 |  |  | 137,419 |
Fixed maturity securities | $ | 2,420,657 |  |  | $ | 27,496 |  |  | $ | 11,043,923 |  |  | $ | 783,679 |  |  | $ | 13,464,580 |  |  | $ | 811,175 |

Substantially all of the securities in an unrealized loss position are rated investment grade, except for the securities in the foreign government classification. A significant amount of the unrealized loss on foreign government securities is the result of changes in currency exchange rates.
A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at March 31, 2024 is presented in the table below:

($ in thousands) | Number of Securities |  | Aggregate Fair Value |  | Gross Unrealized Loss
Foreign government | 36 |  |  | $ | 93,212 |  |  | $ | 141,742 |
State and municipal | 5 |  |  | 24,438 |  |  | 4,918 |
Corporate | 25 |  |  | 42,772 |  |  | 2,291 |
Mortgage-backed | 15 |  |  | 4,526 |  |  | 237 |
Asset-backed | 4 |  |  | 86 |  |  | 70 |
Total | 85 |  |  | $ | 165,034 |  |  | $ | 149,258 |

For fixed maturity securities that management does not intend to sell or to be required to sell, the portion of the decline in value that is considered to be due to credit factors is recognized in earnings, and the portion of the decline in value that is considered to be due to non-credit factors is recognized in other comprehensive income (loss).
The Company has evaluated its fixed maturity securities in an unrealized loss position and believes the unrealized losses are due primarily to temporary market and sector-related factors rather than to issuer-specific factors. None of these securities are delinquent or in default under financial covenants. Based on its assessment of these issuers, the Company expects them to continue to meet their contractual payment obligations as they become due.
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(15) Fair Value Measurements
The Company’s fixed maturity available for sale securities, equity securities and its arbitrage trading account securities are carried at fair value. Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows:
Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
Level 2 - Quoted prices for similar assets or valuations based on inputs that are observable.
Level 3 - Estimates of fair value based on internal pricing methodologies using unobservable inputs. Unobservable inputs are only used to measure fair value to the extent that observable inputs are not available.
Substantially all of the Company’s fixed maturity securities were priced by independent pricing services. The prices provided by the independent pricing services are estimated based on observable market data in active markets utilizing pricing models and processes, which may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, sector groupings, matrix pricing and reference data. The pricing services may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs are available for each security evaluation on any given day. The pricing services used by the Company have indicated that they will only produce an estimate of fair value if objectively verifiable information is available. The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness and periodically performs independent price tests of a sample of securities to ensure proper valuation.
If prices from independent pricing services are not available for fixed maturity securities, the Company estimates the fair value. For Level 2 securities, the Company utilizes pricing models and processes which may include benchmark yields, sector groupings, matrix pricing, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, bids, offers and reference data. Where broker quotes are used, the Company generally requests two or more quotes and sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes received from brokers. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial projections, credit quality and business developments of the issuer and other relevant information.
For Level 3 securities, the Company generally uses a discounted cash flow model to estimate the fair value of fixed maturity securities. The cash flow models are based upon assumptions as to prevailing credit spreads, interest rate and interest rate volatility, time to maturity and subordination levels. Projected cash flows are discounted at rates that are adjusted to reflect illiquidity, where appropriate.
17

The following tables present the assets and liabilities measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023 by level:

(In thousands) | Total |  | Level 1 |  | Level 2 |  | Level 3
March 31, 2024 |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Fixed maturity securities available for sale: |  |  |  |  |  |  |
U.S. government and government agency | $ | 1,829,552 |  |  | $ | — |  |  | $ | 1,829,552 |  |  | $ | — |
State and municipal | 2,552,786 |  |  | — |  |  | 2,552,786 |  |  | — |
Mortgage-backed | 2,408,018 |  |  | — |  |  | 2,408,018 |  |  | — |
Asset-backed | 4,239,561 |  |  | — |  |  | 4,239,561 |  |  | — |
Corporate | 8,162,703 |  |  | — |  |  | 8,162,703 |  |  | — |
Foreign government | 1,718,252 |  |  | — |  |  | 1,718,252 |  |  | — |
Total fixed maturity securities available for sale | 20,910,872 |  |  | — |  |  | 20,910,872 |  |  | — |
Equity securities: |  |  |  |  |  |  |
Common stocks | 846,669 |  |  | 843,441 |  |  | 1,059 |  |  | 2,169 |
Preferred stocks | 331,379 |  |  | — |  |  | 327,743 |  |  | 3,636 |
Total equity securities | 1,178,048 |  |  | 843,441 |  |  | 328,802 |  |  | 5,805 |
Arbitrage trading account | 1,146,119 |  |  | 752,159 |  |  | 390,284 |  |  | 3,676 |
Total | $ | 23,235,039 |  |  | $ | 1,595,600 |  |  | $ | 21,629,958 |  |  | $ | 9,481 |
Liabilities: |  |  |  |  |  |  |
Trading account securities sold but not yet purchased | $ | 40,298 |  |  | $ | 40,298 |  |  | $ | — |  |  | $ | — |
December 31, 2023 |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Fixed maturity securities available for sale: |  |  |  |  |  |  |
U.S. government and government agency | $ | 1,716,731 |  |  | $ | — |  |  | $ | 1,716,731 |  |  | $ | — |
State and municipal | 2,634,422 |  |  | — |  |  | 2,634,422 |  |  | — |
Mortgage-backed | 2,266,455 |  |  | — |  |  | 2,266,455 |  |  | — |
Asset-backed | 4,187,040 |  |  | — |  |  | 4,187,040 |  |  | — |
Corporate | 7,654,059 |  |  | — |  |  | 7,654,059 |  |  | — |
Foreign government | 1,666,229 |  |  | — |  |  | 1,666,229 |  |  | — |
Total fixed maturity securities available for sale | 20,124,936 |  |  | — |  |  | 20,124,936 |  |  | — |
Equity securities: |  |  |  |  |  |  |
Common stocks | 838,054 |  |  | 835,338 |  |  | 1,158 |  |  | 1,558 |
Preferred stocks | 252,293 |  |  | — |  |  | 248,598 |  |  | 3,695 |
Total equity securities | 1,090,347 |  |  | 835,338 |  |  | 249,756 |  |  | 5,253 |
Arbitrage trading account | 938,049 |  |  | 546,110 |  |  | 388,167 |  |  | 3,772 |
Total | $ | 22,153,332 |  |  | $ | 1,381,448 |  |  | $ | 20,762,859 |  |  | $ | 9,025 |
Liabilities: |  |  |  |  |  |  |
Trading account securities sold but not yet purchased | $ | 9,357 |  |  | $ | 9,357 |  |  | $ | — |  |  | $ | — |

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The following tables summarize changes in Level 3 assets and liabilities for the three months ended March 31, 2024 and for the year ended December 31, 2023:

Gains (Losses) Included In:
(In thousands) | Beginning Balance |  | Earnings (Losses) |  | Other Comprehensive Income (Losses) |  | Impairments |  | Purchases |  | Sales |  | Paydowns / Maturities |  | Transfers In / (Out) |  | Ending Balance
Three Months Ended March 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stocks | $ | 1,558 |  |  | $ | 611 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,169 |
Preferred stocks | 3,695 |  |  | (2) |  |  | — |  |  | — |  |  | — |  |  | (57) |  |  | — |  |  | — |  |  | 3,636 |
Total | 5,253 |  |  | 609 |  |  | — |  |  | — |  |  | — |  |  | (57) |  |  | — |  |  | — |  |  | 5,805 |
Arbitrage trading account | 3,772 |  |  | (133) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 37 |  |  | 3,676 |
Total | $ | 9,025 |  |  | $ | 476 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (57) |  |  | $ | — |  |  | $ | 37 |  |  | $ | 9,481 |
Year Ended December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stocks | $ | 2,599 |  |  | $ | (1,041) |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,558 |
Preferred stocks | 11,299 |  |  | (3) |  |  | — |  |  | (7,601) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,695 |
Total | 13,898 |  |  | (1,044) |  |  | — |  |  | (7,601) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 5,253 |
Arbitrage trading account | 3,590 |  |  | 117 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 65 |  |  | 3,772 |
Total | $ | 17,488 |  |  | $ | (927) |  |  | $ | — |  |  | $ | (7,601) |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 65 |  |  | $ | 9,025 |

For the three months ended March 31, 2024 and for the year ended December 31, 2023, securities within the arbitrage trading account portfolio that no longer had a publicly traded price were transferred into Level 3.
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(16) Reserves for Loss and Loss Expenses
The Company's reserves for losses and loss expenses are comprised of case reserves and incurred but not reported liabilities ("IBNR"). When a claim is reported, a case reserve is established for the estimated ultimate payment based upon known information about the claim. As more information about the claim becomes available over time, case reserves are adjusted up or down as appropriate. Reserves are also established on an aggregate basis to provide for IBNR liabilities and expected loss reserve development on reported claims.
Loss reserves included in the Company’s financial statements represent management’s best estimates based upon an actuarially derived point estimate and other considerations. The Company uses a variety of actuarial techniques and methods to derive an actuarial point estimate for each operating unit. These methods include paid loss development, incurred loss development, paid and incurred Bornhuetter-Ferguson methods and frequency and severity methods. In circumstances where one actuarial method is considered more credible than the others, that method is used to set the point estimate. The actuarial point estimate may also be based on a judgmental weighting of estimates produced from each of the methods considered. Industry loss experience is used to supplement the Company’s own data in selecting “tail factors” in areas where the Company’s own data is limited. The actuarial data is analyzed by line of business, coverage and accident or policy year, as appropriate, for each operating unit.
The establishment of the actuarially derived loss reserve point estimate also includes consideration of qualitative factors that may affect the ultimate losses. These qualitative considerations include, among others, the impact of re-underwriting initiatives, changes in the mix of business, changes in distribution sources and changes in policy terms and conditions.
The key assumptions used to arrive at the best estimate of loss reserves are the expected loss ratios, rate of loss cost inflation, and reported and paid loss emergence patterns. Expected loss ratios represent management’s expectation of losses at the time the business is priced and written, before any actual claims experience has emerged. This expectation is a significant determinant of the estimate of loss reserves for recently written business where there is little paid or incurred loss data to consider. Expected loss ratios are generally derived from historical loss ratios adjusted for the impact of rate changes, loss cost trends and known changes in the type of risks underwritten. Expected loss ratios are estimated for each key line of business within each operating unit. Expected loss cost inflation is particularly important for the long-tail lines, such as excess casualty, and claims with a high medical component, such as workers’ compensation. Reported and paid loss emergence patterns are used to project current reported or paid loss amounts to their ultimate settlement value. Loss development factors are based on the historical emergence patterns of paid and incurred losses, and are derived from the Company’s own experience and industry data. The paid loss emergence pattern is also significant to excess and assumed workers’ compensation reserves because those reserves are discounted to their estimated present value based upon such estimated payout patterns.
Loss frequency and severity are measures of loss activity that are considered in determining the key assumptions described in our discussion of loss and loss expense reserves, including expected loss ratios, rate of loss cost inflation and reported and paid loss emergence patterns. Loss frequency is a measure of the number of claims per unit of insured exposure, and loss severity is a measure of the average size of claims. Factors affecting loss frequency include the effectiveness of loss controls and safety programs and changes in economic activity or weather patterns. Factors affecting loss severity include changes in policy limits, retentions, rate of inflation and judicial interpretations.
Another factor affecting estimates of loss frequency and severity is the loss reporting lag, which is the period of time between the occurrence of a loss and the date the loss is reported to the Company. The length of the loss reporting lag affects our ability to accurately predict loss frequency (loss frequencies are more predictable for lines with short reporting lags) as well as the amount of reserves needed for incurred but not reported losses (less IBNR is required for lines with short reporting lags). As a result, loss reserves for lines with short reporting lags are likely to have less variation from initial loss estimates. For lines with short reporting lags, which include commercial automobile, primary workers’ compensation, other liability (claims-made) and property business, the key assumption is the loss emergence pattern used to project ultimate loss estimates from known losses paid or reported to date. For lines of business with long reporting lags, which include other liability (occurrence), products liability, excess workers’ compensation and liability reinsurance, the key assumption is the expected loss ratio since there is often little paid or incurred loss data to consider. Historically, the Company has experienced less variation from its initial loss estimates for lines of business with short reporting lags than for lines of business with long reporting lags.
The key assumptions used in calculating the most recent estimate of the loss reserves are reviewed each quarter and adjusted, to the extent necessary, to reflect the latest reported loss data, current trends and other factors observed.
20

The table below provides a reconciliation of the beginning and ending reserve balances:

| March 31, |  |
(In thousands) | 2024 |  | 2023 |  |
Net reserves at beginning of period | $ | 15,661,820 |  |  | $ | 14,248,879 |  |  |
Net provision for losses and loss expenses: |  |  |  |  |
Claims occurring during the current year (1) | 1,647,674 |  |  | 1,502,817 |  |  |
Increase in estimates for claims occurring in prior years (2) (3) | 7,367 |  |  | 28,205 |  |  |
Loss reserve discount accretion | 8,737 |  |  | 7,733 |  |  |
Total | 1,663,778 |  |  | 1,538,755 |  |  |
Net payments for claims: |  |  |  |  |
Current year | 107,434 |  |  | 110,274 |  |  |
Prior years | 1,158,864 |  |  | 1,106,481 |  |  |
Total | 1,266,298 |  |  | 1,216,755 |  |  |
Foreign currency translation | (52,944) |  |  | 1,154 |  |  |
Net reserves at end of period | 16,006,356 |  |  | 14,572,033 |  |  |
Ceded reserves at end of period | 3,093,272 |  |  | 2,859,602 |  |  |
Gross reserves at end of period | $ | 19,099,628 |  |  | $ | 17,431,635 |  |  |

_______________________________________
(1) Claims occurring during the current year are net of loss reserve discounts of $14 million and $11 million for the three months ended March 31, 2024 and 2023, respectively.
(2) The change in estimates for claims occurring in prior years is net of loss reserve discount. On an undiscounted basis, the estimates for claims occurring in prior years decreased by $10 million and increased by $19 million for the three months ended March 31, 2024 and 2023, respectively.
(3) For certain retrospectively rated insurance policies and reinsurance agreements, reserve development is offset by additional or return premiums. Favorable development, net of additional and return premiums, was $1 million and adverse development was $24 million for the three months ended March 31, 2024 and 2023, respectively.
The ultimate net impact of COVID-19 on the Company’s reserves remains uncertain. As of March 31, 2024, the Company had recognized losses for COVID-19-related claims activity, net of reinsurance, of approximately $386 million, of which $328 million relates to the Insurance segment and $58 million relates to the Reinsurance & Monoline Excess segment. Such $386 million of COVID-19-related losses included $383 million of reported losses and $3 million of IBNR.
During the three months ended March 31, 2024, favorable prior year development (net of additional and return premiums) of $1 million included $9 million for the Reinsurance & Monoline Excess segment largely offset by $8 million of adverse prior year development for the Insurance segment.
For the Insurance segment, the adverse development during the first quarter of 2024 was driven by commercial auto liability and excess other liability, including umbrella, and was partially offset by favorable development for workers’ compensation and professional liability. The adverse commercial auto liability development was concentrated in accident years 2019 through 2023, while the excess other liability, including umbrella, development was focused in accident years 2017 through 2021. A significant portion of the excess other liability, including umbrella, development related to underlying commercial auto exposures. The Company believes that commercial auto-related claims are being particularly impacted by social inflation, which is contributing to an increase in the frequency of large losses beyond expectations. Social inflation can include higher settlement demands from plaintiffs, use of aggressive actions by the plaintiffs' bar such as litigation funding, negative public sentiment towards large businesses and corporations, and erosion of tort reforms, among others.
The favorable workers’ compensation development for the Insurance segment was mainly related to accident years 2018 through 2023, while the favorable professional liability development was mainly in accident years 2021 and 2022. For workers’ compensation, favorable reported claim frequency, below expectations, continued to drive the favorable reserve development. For professional liability, the reported loss experience for the 2021 and 2022 accident years was better than expected. These accident years also feature business written at peak pricing levels, which the Company now believes will result in higher profitability than initially anticipated.
For the Reinsurance & Monoline Excess segment, the favorable development was driven mainly by favorable development in excess workers’ compensation, partially offset by adverse development in the non-proportional reinsurance assumed liability line of business. The favorable excess workers’ compensation development was driven by continued lower claim frequency and reported losses relative to expectations, and to favorable claim settlements spread across many prior accident years. The unfavorable development for non-proportional reinsurance was concentrated mainly in accident years 2017
21

through 2019 and was associated primarily with our U.S. and U.K. excess general liability reinsurance businesses, including accounts reinsuring construction projects.
During the three months ended March 31, 2023, adverse prior year development (net of additional and return premiums) of $24 million included $12 million for the Insurance segment and $12 million for the Reinsurance & Monoline Excess segment.
This overall adverse development for both segments was primarily attributable to property catastrophe losses related to 2022 events which were still being adjusted and settled during the first quarter of 2023. In particular, losses related to U.S. winter storms which occurred during the month of December were a significant driver of the development, as information gathering and evaluation of many of these losses were still ongoing into 2023.
In addition to the property prior year adverse development discussed above, during the first quarter of 2023, the Insurance segment experienced adverse prior year development on casualty lines for the 2016 through 2019 accident years, which was offset by favorable prior year development on casualty lines for the 2022 accident year. The adverse development on the 2016 through 2019 accident years was concentrated in the other liability line of business, and to a lesser degree, professional liability, including medical professional. The development, which particularly impacted business attaching excess of primary policy limits, was driven by a larger than expected number of large losses reported. The Company believes social inflation contributed to an increase in the frequency of large losses for these accident years. Social inflation can include higher settlement demands from plaintiffs, use of tactics such as litigation funding by the plaintiffs’ bar, negative public sentiment towards large businesses and corporations, and erosion of tort reforms, among others.
The favorable prior year development on casualty lines for the 2022 accident year in the Insurance segment was concentrated in the other liability, professional liability, and workers’ compensation lines of business. Due to uncertainty regarding incurred loss frequency and severity in light of ongoing social inflation and the emergence from the COVID-19 pandemic, the Company set its initial loss ratios for the 2022 accident year prudently, and largely maintained these estimates through the end of 2022. The reported loss experience for these lines of business for the 2022 accident year was significantly better than expected, and the Company reacted to this favorable emergence in the first quarter of 2023.
(17) Fair Value of Financial Instruments
The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:

| March 31, 2024 |  | December 31, 2023
(In thousands) | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Assets: |  |  |  |  |  |  |
Fixed maturity securities | $ | 20,964,854 |  |  | $ | 20,967,212 |  |  | $ | 20,178,308 |  |  | $ | 20,181,547 |
Equity securities | 1,178,048 |  |  | 1,178,048 |  |  | 1,090,347 |  |  | 1,090,347 |
Arbitrage trading account | 1,146,119 |  |  | 1,146,119 |  |  | 938,049 |  |  | 938,049 |
Loans receivable | 228,766 |  |  | 229,156 |  |  | 201,271 |  |  | 198,244 |
Cash and cash equivalents | 1,169,053 |  |  | 1,169,053 |  |  | 1,363,195 |  |  | 1,363,195 |
Trading account receivables from brokers and clearing organizations | 141,277 |  |  | 141,277 |  |  | 303,614 |  |  | 303,614 |
Due from broker | — |  |  | — |  |  | 36,747 |  |  | 36,747 |
Liabilities: |  |  |  |  |  |  |
Due to broker | 33,027 |  |  | 33,027 |  |  | — |  |  | — |
Trading account securities sold but not yet purchased | 40,298 |  |  | 40,298 |  |  | 9,357 |  |  | 9,357 |
Senior notes and other debt | 1,827,997 |  |  | 1,435,877 |  |  | 1,827,951 |  |  | 1,480,076 |
Subordinated debentures | 1,009,269 |  |  | 893,358 |  |  | 1,009,090 |  |  | 929,598 |

The estimated fair values of the Company’s fixed maturity securities, equity securities and arbitrage trading account securities are based on various valuation techniques that rely on fair value measurements as described in Note 15. The fair value of loans receivable are estimated by using current institutional purchaser yield requirements for loans with similar credit characteristics, which is considered a Level 2 input. The fair value of the senior notes and other debt and the subordinated debentures is based on spreads for similar securities, which is considered a Level 2 input.
22

(18) Premiums and Reinsurance Related Information
The following is a summary of insurance and reinsurance financial information:

| For the Three Months Ended March 31, |  |
(In thousands) | 2024 |  | 2023 |  |  |  |
Written premiums: |  |  |  |  |  |  |
Direct | $ | 3,039,066 |  |  | $ | 2,738,754 |  |  |  |  |
Assumed | 323,689 |  |  | 310,563 |  |  |  |  |
Ceded | (511,464) |  |  | (474,493) |  |  |  |  |
Total net premiums written | $ | 2,851,291 |  |  | $ | 2,574,824 |  |  |  |  |
Earned premiums: |  |  |  |  |  |  |
Direct | $ | 2,936,643 |  |  | $ | 2,667,063 |  |  |  |  |
Assumed | 337,911 |  |  | 295,230 |  |  |  |  |
Ceded | (510,207) |  |  | (470,861) |  |  |  |  |
Total net premiums earned | $ | 2,764,347 |  |  | $ | 2,491,432 |  |  |  |  |
Ceded losses and loss expenses incurred | $ | 305,951 |  |  | $ | 315,476 |  |  |  |  |
Ceded commissions earned | $ | 121,054 |  |  | $ | 118,418 |  |  |  |  |

The following table presents the rollforward of the allowance for expected credit losses for premiums and fees receivable for the three months ended March 31, 2024 and 2023:

(In thousands) | 2024 |  | 2023
Allowance for expected credit losses, beginning of period | $ | 35,110 |  |  | $ | 30,660 |
Change in expected credit losses | (71) |  |  | 1,693 |
Allowance for expected credit losses, end of period | $ | 35,039 |  |  | $ | 32,353 |

The Company reinsures a portion of its insurance exposures in order to reduce its net liability on individual risks and catastrophe losses. The Company also cedes premiums to state assigned risk plans and captive insurance companies. Estimated amounts due from reinsurers are reported net of an allowance for expected credit losses.
The following table presents the rollforward of the allowance for expected credit losses associated with due from reinsurers for the three months ended March 31, 2024 and 2023:

(In thousands) | 2024 |  | 2023 |  |
Allowance for expected credit losses, beginning of period | $ | 8,404 |  |  | $ | 8,064 |  |  |
Change in expected credit losses | 781 |  |  | 639 |  |  |
Allowance for expected credit losses, end of period | $ | 9,185 |  |  | $ | 8,703 |  |  |

(19) Restricted Stock Units
Pursuant to its stock incentive plan, the Company may issue restricted stock units ("RSUs") to employees of the Company and its subsidiaries. The RSUs generally vest three to five years from the award date and are subject to other vesting and forfeiture provisions contained in the award agreement. RSUs are expensed pro-ratably over the vesting period. RSU expenses were $13 million and $12 million for the three months ended March 31, 2024 and 2023, respectively. A summary of RSUs issued in the three months ended March 31, 2024 and 2023 follows:

($ in thousands) | Units |  | Fair Value
2024 | 1,214 |  |  | $ | 100 |
2023 | — |  |  | $ | — |

23

(20) Litigation and Contingent Liabilities
In the ordinary course of business, the Company is subject to disputes, litigation and arbitration arising from its insurance and reinsurance businesses. These matters are generally related to insurance and reinsurance claims and are considered in the establishment of loss and loss expense reserves. In addition, the Company may also become involved in legal actions which seek extra-contractual damages, punitive damages or penalties, including claims alleging bad faith in handling of insurance claims. The Company expects its ultimate liability with respect to such matters will not be material to its financial condition. However, adverse outcomes on such matters are possible, from time to time, and could be material to the Company’s results of operations in any particular financial reporting period.
On December 22, 2023, one of the Company’s subsidiaries filed a lawsuit against certain reinsurers to recover in excess of $90 million in respect of certain losses paid to its policyholders under certain event cancellation and related insurance policies. The Company believes its claims against the reinsurers are meritorious and expects a positive resolution to its lawsuit. While an adverse outcome is possible, the Company believes that the outcome, in any case, will not be material to the Company’s financial condition.
(21) Leases
Lessees are required to recognize a right-of-use asset and a lease liability for leases with terms of more than 12 months on the balance sheet. All leases disclosed within this footnote are classified as operating leases. Recognized right-of-use asset and lease liability are reported within other assets and other liabilities, respectively, in the consolidated balance sheet. Lease expense is reported in other operating costs and expenses in the consolidated statement of income and accounted for on a straight-line basis over the lease term.
To determine the discount rate used to calculate present value of future minimum lease payments, the Company uses its incremental borrowing rate during the lease commencement period in line with the respective lease duration. In certain cases, the Company has the option to renew the lease. Lease renewal future payments are included in the present value of the future minimum lease payments when the Company determines it is reasonably certain to renew.
The main leases entered into by the Company are for office space used by the Company’s operating units across the world. Additionally, the Company, to a lesser extent, has equipment leases mainly for office equipment. Further information relating to operating lease expense and other operating lease information are as follows:

| For the Three Months Ended March 31, |  |
(In thousands) | 2024 |  | 2023 |  |  |  |
Leases: |  |  |  |  |  |  |
Lease cost | $ | 11,077 |  |  | $ | 10,188 |  |  |  |  |
Cash paid for amounts included in the measurement of lease liabilities reported in operating cash flows | $ | 12,232 |  |  | $ | 10,563 |  |  |  |  |
Right-of-use assets obtained in exchange for new lease liabilities | $ | 24,695 |  |  | $ | 5,313 |  |  |  |  |

| As of March 31,
($ in thousands) | 2024 |  | 2023
Right-of-use assets | $ | 191,720 |  | $ | 164,547
Lease liabilities | $ | 233,114 |  | $ | 199,225
Weighted-average remaining lease term | 7.6 years |  | 7.1 years
Weighted-average discount rate | 5.44 | % |  | 4.49 | %

24

Contractual maturities of the Company’s future minimum lease payments are as follows:

(In thousands) | March 31, 2024 |  |  |
Contractual Maturities: |  |  |  |
2024 | $ | 38,862 |  |  |  |
2025 | 44,402 |  |  |  |
2026 | 37,499 |  |  |  |
2027 | 28,341 |  |  |  |
2028 | 26,760 |  |  |  |
Thereafter | 104,223 |  |  |  |
Total undiscounted future minimum lease payments | 280,087 |  |  |  |
Less: Discount impact | 46,973 |  |  |  |
Total lease liability | $ | 233,114 |  |  |  |

25

(22) Business Segments
The Company’s reportable segments include the following two business segments, plus a corporate segment:
•Insurance - predominantly commercial insurance business, including excess and surplus lines, admitted lines and specialty personal lines throughout the United States, as well as insurance business in Asia, Australia, Canada, Continental Europe, Mexico, Scandinavia, South America and the United Kingdom.
•Reinsurance & Monoline Excess - reinsurance business on a facultative and treaty basis, primarily in the United States, the United Kingdom, Continental Europe, Australia, the Asia-Pacific Region and South Africa, as well as operations that solely retain risk on an excess basis and certain program management business.
The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Income tax expense and benefits are calculated based upon the Company's overall effective tax rate.
Summary financial information about the Company's reporting segments is presented in the following tables. Income (loss) before income taxes by segment includes allocated investment income. Identifiable assets by segment are those assets used in or allocated to the operation of each segment.

| Revenues |  |  |  |
(In thousands) | Earned Premiums (1) |  | Investment Income |  | Other |  | Total (2) |  | Pre-Tax Income (Loss) |  | Net Income (Loss) to Common Stockholders
Three months ended March 31, 2024 |  |  |  |  |  |  |  |  |  |
Insurance | $ | 2,398,768 |  |  | $ | 244,778 |  |  | $ | 9,423 |  |  | $ | 2,652,969 |  |  | $ | 478,149 |  |  | $ | 365,091 |
Reinsurance & Monoline Excess | 365,579 |  |  | 53,211 |  |  | — |  |  | 418,790 |  |  | 127,624 |  |  | 102,126 |
Corporate, other and eliminations (3) | — |  |  | 21,850 |  |  | 137,384 |  |  | 159,234 |  |  | (57,482) |  |  | (43,893) |
Net investment gains | — |  |  | — |  |  | 25,780 |  |  | 25,780 |  |  | 25,780 |  |  | 19,147 |
Total | $ | 2,764,347 |  |  | $ | 319,839 |  |  | $ | 172,587 |  |  | $ | 3,256,773 |  |  | $ | 574,071 |  |  | $ | 442,471 |
Three months ended March 31, 2023 |  |  |  |  |  |  |  |  |  |
Insurance | $ | 2,142,924 |  |  | $ | 163,558 |  |  | $ | 9,577 |  |  | $ | 2,316,059 |  |  | $ | 352,626 |  |  | $ | 274,108 |
Reinsurance & Monoline Excess | 348,508 |  |  | 54,583 |  |  | — |  |  | 403,091 |  |  | 101,285 |  |  | 82,357 |
Corporate, other and eliminations (3) | — |  |  | 5,257 |  |  | 147,587 |  |  | 152,844 |  |  | (100,850) |  |  | (80,499) |
Net investment gains | — |  |  | — |  |  | 23,010 |  |  | 23,010 |  |  | 23,010 |  |  | 18,160 |
Total | $ | 2,491,432 |  |  | $ | 223,398 |  |  | $ | 180,174 |  |  | $ | 2,895,004 |  |  | $ | 376,071 |  |  | $ | 294,126 |

_________________
(1) Certain amounts included in earned premiums of each segment are related to inter-segment transactions.
(2) Revenues for Insurance from foreign operations for the three months ended March 31, 2024 and 2023 were $393 million and $274 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign operations for the three months ended March 31, 2024 and 2023 were $111 million and $106 million, respectively.
(3) Corporate, other and eliminations represent corporate revenues and expenses that are not allocated to business segments.
Identifiable Assets

(In thousands) | March 31, 2024 |  | December 31, 2023 |
Insurance | $ | 30,048,006 |  |  | $ | 29,923,282 |  |
Reinsurance & Monoline Excess | 5,506,533 |  |  | 5,545,249 |  |
Corporate, other and eliminations | 2,296,533 |  |  | 1,643,299 |  |
Consolidated | $ | 37,851,072 |  |  | $ | 37,111,830 |  |

26

Net premiums earned by major line of business are as follows:

| For the Three Months Ended March 31, |  |
(In thousands) | 2024 |  | 2023 |  |  |  |
Insurance: |  |  |  |  |  |  |
Other liability | $ | 967,260 |  |  | $ | 853,472 |  |  |  |  |
Short-tail lines (1) | 510,809 |  |  | 412,534 |  |  |  |  |
Auto | 354,013 |  |  | 294,116 |  |  |  |  |
Workers' compensation | 301,495 |  |  | 305,561 |  |  |  |  |
Professional liability | 265,191 |  |  | 277,241 |  |  |  |  |
Total Insurance | 2,398,768 |  |  | 2,142,924 |  |  |  |  |
Reinsurance & Monoline Excess: |  |  |  |  |  |  |
Casualty (2) | 197,844 |  |  | 214,712 |  |  |  |  |
Property (2) | 102,384 |  |  | 75,152 |  |  |  |  |
Monoline excess (3) | 65,351 |  |  | 58,644 |  |  |  |  |
Total Reinsurance & Monoline Excess | 365,579 |  |  | 348,508 |  |  |  |  |
Total | $ | 2,764,347 |  |  | $ | 2,491,432 |  |  |  |  |

______________
(1) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery, high net worth homeowners and other lines.
(2) Includes reinsurance casualty and property and certain program management business.
(3) Monoline excess includes operations that solely retain risk on an excess basis.
27

SAFE HARBOR STATEMENT
This is a “Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995. Any forward-looking statements contained herein, including statements related to our outlook for the industry and for our performance for the year 2024 and beyond, are based upon the Company’s historical performance and on current plans, estimates and expectations. The inclusion of this forward-looking information should not be regarded as a representation by us or any other person that the future plans, estimates or expectations contemplated by us will be achieved. They are subject to various risks and uncertainties, including but not limited to: the cyclical nature of the property casualty industry; the impact of significant competition, including new entrants to the industry; the long-tail and potentially volatile nature of the insurance and reinsurance business; product demand and pricing; claims development and the process of estimating reserves; investment risks, including those of our portfolio of fixed maturity securities and investments in equity securities, including investments in financial institutions, foreign governmental bonds, municipal bonds, mortgage-backed securities, loans receivable, investment funds, including real estate, merger arbitrage, energy related and private equity investments; the effects of emerging claim and coverage issues; the uncertain nature of damage theories and loss amounts, including claims for cybersecurity-related risks; natural and man-made catastrophic losses, including as a result of terrorist activities; the ongoing effects of the COVID-19 pandemic, or other epidemics and pandemics; the impact of climate change, which may alter the frequency and increase the severity of catastrophe events; general economic and market activities, including inflation, changing interest rates, and volatility in the credit and capital markets; the impact of the conditions in the financial markets and the global economy, and the potential effect of legislative, regulatory, accounting or other initiatives taken in response, on our results and financial condition; foreign currency and political risks relating to our international operations; our ability to attract and retain key personnel and qualified employees; continued availability of capital and financing; the success of our new ventures or acquisitions and the availability of other opportunities; the availability of reinsurance; our retention under the Terrorism Risk Insurance Program Reauthorization Act of 2019; the ability or willingness of our reinsurers to pay reinsurance recoverables owed to us; other legislative and regulatory developments, including those related to business practices in the insurance industry; credit risk related to our policyholders, independent agents and brokers; changes in the ratings assigned to us or our insurance company subsidiaries by rating agencies; the availability of dividends from our insurance company subsidiaries; cyber security breaches of our information technology systems and the information technology systems of our vendors and other third parties, or related processes and systems; the effectiveness of our controls to ensure compliance with guidelines, policies and legal and regulatory standards; and other risks detailed from time to time in the Company’s filings with the Securities and Exchange Commission.
These risks and uncertainties could cause our actual results for the year 2024 and beyond to differ materially from those expressed in any forward-looking statement we make. Any projections of growth in our revenues would not necessarily result in commensurate levels of earnings. Our future financial performance is dependent upon factors discussed in our Annual Report on Form 10-K, elsewhere in this Form 10-Q and our other SEC filings. Forward-looking statements speak only as of the date on which they are made. Except to the extent required by applicable laws, the Company does not undertake any obligation to update or revise any forward-looking statement, whether as a result of new information, future developments or otherwise.
28

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations
Overview
W. R. Berkley Corporation is an insurance holding company that is among the largest commercial lines writers in the United States and operates worldwide in two segments of the property and casualty business: Insurance and Reinsurance & Monoline Excess. Our decentralized structure provides us with the flexibility to respond quickly and efficiently to local or specific market conditions and to pursue specialty business niches. It also allows us to be closer to our customers in order to better understand their individual needs and risk characteristics. While providing our business units with certain operating autonomy, our structure allows us to capitalize on the benefits of economies of scale through centralized capital, investment, reinsurance, enterprise risk management, and actuarial, financial and corporate legal staff support. The Company’s primary sources of revenues and earnings are its insurance operations and its investments.
An important part of our strategy is to form new operating units to capitalize on various business opportunities. Over the years, the Company has formed numerous operating units that are focused on important parts of the economy in the U.S., including healthcare, cyber security, energy and agriculture, and on growing international markets, including the Asia-Pacific region, South America and Mexico.
The profitability of the Company’s insurance business is affected primarily by the adequacy of premium rates. The ultimate adequacy of premium rates is not known with certainty at the time an insurance policy is issued because premiums are determined before claims are reported. The ultimate adequacy of premium rates is affected mainly by the severity and frequency of claims, which are influenced by many factors, including natural and other disasters, regulatory measures and court decisions that define and change the extent of coverage and the effects of economic inflation on the amount of compensation for injuries or losses. General insurance prices are also influenced by available insurance capacity, i.e., the level of capital employed in the industry, and the industry’s willingness to deploy that capital.
The Company’s profitability is also affected by its investment income and investment gains. The Company’s invested assets are invested principally in fixed maturity securities. The return on fixed maturity securities is affected primarily by general interest rates, as well as the credit quality and duration of the securities.
The Company also invests in equity securities, merger arbitrage securities, investment funds, private equity, loans and real estate-related assets. The Company's investments in investment funds and its other alternative investments have experienced, and the Company expects to continue to experience, greater fluctuations in investment income. The Company's share of the earnings or losses from investment funds is generally reported on a one-quarter lag in order to facilitate the timely completion of the Company's consolidated financial statements.
Commencing with the first quarter of 2024, the Company reclassified a program management business from the Insurance segment to the Reinsurance & Monoline Excess segment. The reclassified business is a program management business offering support on a nationwide basis for commercial casualty and property program administrators. Reclassifications have been made to the Company's 2023 financial information to conform with this presentation.
In June 2023, the Company completed a sale of the property and casualty insurance services division of Breckenridge IS, Inc. and recognized a pre-tax net realized gain on investment of $89 million.
Critical Accounting Estimates
The following presents a discussion of accounting policies and estimates relating to reserves for losses and loss expenses, assumed premiums and allowance for expected credit losses on investments. Management believes these policies and estimates are the most critical to its operations and require the most difficult, subjective and complex judgments.
Reserves for Losses and Loss Expenses. To recognize liabilities for unpaid losses, either known or unknown, insurers establish reserves, which is a balance sheet account representing estimates of future amounts needed to pay claims and related expenses with respect to insured events which have occurred. Estimates and assumptions relating to reserves for losses and loss expenses are based on complex and subjective judgments, often including the interplay of specific uncertainties with related accounting and actuarial measurements. Such estimates are also susceptible to change as significant periods of time may elapse between the occurrence of an insured loss, the report of the loss to the insurer, the ultimate determination of the cost of the loss and the insurer’s payment of that loss.
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In general, when a claim is reported, claims personnel establish a “case reserve” for the estimated amount of the ultimate payment based upon known information about the claim at that time. The estimate represents an informed judgment based on general reserving practices and reflects the experience and knowledge of the claims personnel regarding the nature and value of the specific type of claim. Reserves are also established on an aggregate basis to provide for losses incurred but not reported (“IBNR”) to the insurer, potential inadequacy of case reserves and the estimated expenses of settling claims, including legal and other fees and general expenses of administrating the claims adjustment process. Reserves are established based upon the then current legal interpretation of coverage provided.
In examining reserve adequacy, several factors are considered in estimating the ultimate economic value of losses. These factors include, among other things, historical data, legal developments, changes in social attitudes and economic conditions, including the effects of inflation. The actuarial process relies on the basic assumption that past experience, adjusted judgmentally for the effects of current developments and anticipated trends, is an appropriate basis for predicting future outcomes. Reserve amounts are based on management’s informed estimates and judgments using currently available data. As additional experience and other data become available and are reviewed, these estimates and judgments may be revised. This may result in reserve increases or decreases that would be reflected in our results in periods in which such estimates and assumptions are changed.
Reserves do not represent an exact calculation of liability. Rather, reserves represent an estimate of what management expects the ultimate settlement and claim administration will cost. While the methods for establishing reserves are well tested over time, some of the major assumptions about anticipated loss emergence patterns are subject to uncertainty. These estimates, which generally involve actuarial projections, are based on management’s assessment of facts and circumstances then known, as well as estimates of trends in claims severity and frequency, judicial theories of liability and other factors, including the actions of third parties which are beyond the Company’s control. These variables are affected by external and internal events, such as inflation and economic volatility, judicial and litigation trends, reinsurance coverage, legislative changes and claim handling and reserving practices, which make it more difficult to accurately predict claim costs. The inherent uncertainties of estimating reserves are greater for certain types of liabilities where long periods of time elapse before a definitive determination of liability is made. Because setting reserves is inherently uncertain, the Company cannot provide assurance that its current reserves will prove adequate in light of subsequent events.
Loss reserves included in the Company’s financial statements represent management’s best estimates based upon an actuarially derived point estimate and other considerations. The Company uses a variety of actuarial techniques and methods to derive an actuarial point estimate for each operating unit. These methods include paid loss development, incurred loss development, paid and incurred Bornhuetter-Ferguson methods and frequency and severity methods. In circumstances where one actuarial method is considered more credible than the others, that method is used to set the point estimate. For example, the paid loss and incurred loss development methods rely on historical paid and incurred loss data. For new lines of business, where there is insufficient history of paid and incurred claims data, or in circumstances where there have been significant changes in claim practices, the paid and incurred loss development methods would be less credible than other actuarial methods. The actuarial point estimate may also be based on a judgmental weighting of estimates produced from each of the methods considered. Industry loss experience is used to supplement the Company’s own data in selecting “tail factors” and in areas where the Company’s own data is limited. The actuarial data is analyzed by line of business, coverage and accident or policy year, as appropriate, for each operating unit.
The establishment of the actuarially derived loss reserve point estimate also includes consideration of qualitative factors that may affect the ultimate losses. These qualitative considerations include, among others, the impact of re-underwriting initiatives, changes in the mix of business, changes in distribution sources and changes in policy terms and conditions. Examples of changes in terms and conditions that can have a significant impact on reserve levels are the use of aggregate policy limits, the expansion of coverage exclusions, whether or not defense costs are within policy limits, and changes in deductibles and attachment points.
The key assumptions used to arrive at the best estimate of loss reserves are the expected loss ratios, rate of loss cost inflation, and reported and paid loss emergence patterns. Expected loss ratios represent management’s expectation of losses at the time the business is written, before any actual claims experience has emerged. This expectation is a significant determinant of the estimate of loss reserves for recently written business where there is little paid or incurred loss data to consider. Expected loss ratios are generally derived from historical loss ratios adjusted for the impact of rate changes, loss cost trends and known changes in the type of risks underwritten. Expected loss ratios are estimated for each key line of business within each operating unit. Expected loss cost inflation is particularly important for the long-tail lines, such as excess casualty, and claims with a high medical component, such as workers’ compensation. Reported and paid loss emergence patterns are used to project current reported or paid loss amounts to their ultimate settlement value. Loss development factors are based on the historical emergence patterns of paid and incurred losses, and are derived from the Company’s own experience and industry data. The paid loss emergence pattern is also significant to excess and assumed workers’ compensation reserves because those reserves are
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discounted to their estimated present value based upon such estimated payout patterns. Management believes the estimates and assumptions it makes in the reserving process provide the best estimate of the ultimate cost of settling claims and related expenses with respect to insured events which have occurred; however, different assumptions and variables could lead to significantly different reserve estimates.
Loss frequency and severity are measures of loss activity that are considered in determining the key assumptions described in our discussion of loss and loss expense reserves, including expected loss ratios, rate of loss cost inflation and reported and paid loss emergence patterns. Loss frequency is a measure of the number of claims per unit of insured exposure, and loss severity is a measure of the average size of claims. Factors affecting loss frequency include the effectiveness of loss controls and safety programs and changes in economic activity or weather patterns. Factors affecting loss severity include changes in policy limits, retentions, rate of inflation and judicial interpretations.
Another factor affecting estimates of loss frequency and severity is the loss reporting lag, which is the period of time between the occurrence of a loss and the date the loss is reported to the Company. The length of the loss reporting lag affects our ability to accurately predict loss frequency (loss frequencies are more predictable for lines with short reporting lags) as well as the amount of reserves needed for incurred but not reported losses (less IBNR is required for lines with short reporting lags). As a result, loss reserves for lines with short reporting lags are likely to have less variation from initial loss estimates. For lines with short reporting lags, which include commercial automobile, primary workers’ compensation, other liability (claims-made) and property business, the key assumption is the loss emergence pattern used to project ultimate loss estimates from known losses paid or reported to date. For lines of business with long reporting lags, which include other liability (occurrence), products liability, excess workers’ compensation and liability reinsurance, the key assumption is the expected loss ratio since there is often little paid or incurred loss data to consider. Historically, the Company has experienced less variation from its initial loss estimates for lines of business with short reporting lags than for lines of business with long reporting lags.
The key assumptions used in calculating the most recent estimate of the loss reserves are reviewed each quarter and adjusted, to the extent necessary, to reflect the latest reported loss data, current trends and other factors observed. If the actual level of loss frequency and severity are higher or lower than expected, the ultimate losses will be different than management’s estimate. The following table reflects the impact of changes (which could be favorable or unfavorable) in frequency and severity, relative to our assumptions, on our loss estimate for claims occurring in 2023:

(In thousands) | Frequency (+/-)
Severity (+/-) | 1% |  | 5% |  | 10%
1% | $ | 126,867 |  |  | $ | 381,863 |  |  | $ | 700,608 |
5% | 381,863 |  |  | 646,957 |  |  | 978,326 |
10% | 700,608 |  |  | 978,326 |  |  | 1,325,474 |

Our net reserves for losses and loss expenses of approximately $16.0 billion as of March 31, 2024 relate to multiple accident years. Therefore, the impact of changes in frequency or severity for more than one accident year could be higher or lower than the amounts reflected above. The impact of such changes would likely be manifested gradually over the course of many years, as the magnitude of the changes became evident.
Approximately $3.2 billion, or 20%, of the Company’s net loss reserves as of March 31, 2024 relate to the Reinsurance & Monoline Excess segment. There is a higher degree of uncertainty and greater variability regarding estimates of excess workers' compensation and assumed reinsurance loss reserves, which predominantly comprise these reserves. In the case of excess workers’ compensation, our policies generally attach at $1 million or higher. The claims which reach our layer therefore tend to involve the most serious injuries and many remain open for the lifetime of the claimant, which extends the claim settlement tail. These claims also occur less frequently but tend to be larger than primary claims, which increases claim variability. In the case of assumed reinsurance our loss reserve estimates are based, in part, upon information received from ceding companies. If information received from ceding companies is not timely or correct, the Company’s estimate of ultimate losses may not be accurate. Furthermore, due to delayed reporting of claim information by ceding companies, the claim settlement tail for assumed reinsurance is also extended. Management considers the impact of delayed reporting and the extended tail in its selection of loss development factors for these lines of business.
Information received from ceding companies is used to set initial expected loss ratios, to establish case reserves and to estimate reserves for incurred but not reported losses on assumed reinsurance business. This information, which is generally provided through reinsurance intermediaries, is gathered through the underwriting process and from periodic claim reports and other correspondence with ceding companies. The Company performs underwriting and claim audits of selected ceding companies to determine the accuracy and completeness of information provided to the Company. The information received from the ceding companies is supplemented by the Company’s own loss development experience with similar lines of business as well as industry loss trends and loss development benchmarks.
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Following is a summary of the Company’s reserves for losses and loss expenses by business segment:

(In thousands) | March 31, 2024 |  | December 31, 2023
Insurance | $ | 12,770,463 |  |  | $ | 12,430,202 |
Reinsurance & Monoline Excess | 3,235,893 |  |  | 3,231,618 |
Net reserves for losses and loss expenses | 16,006,356 |  |  | 15,661,820 |
Ceded reserves for losses and loss expenses | 3,093,272 |  |  | 3,077,832 |
Gross reserves for losses and loss expenses | $ | 19,099,628 |  |  | $ | 18,739,652 |

Following is a summary of the Company’s net reserves for losses and loss expenses by major line of business:

(In thousands) | Reported Case Reserves |  | Incurred But Not Reported |  | Total
March 31, 2024 |  |  |  |  |
Other liability | $ | 1,922,606 |  |  | $ | 4,774,029 |  |  | $ | 6,696,635 |
Workers’ compensation (1) | 1,022,080 |  |  | 814,134 |  |  | 1,836,214 |
Professional liability | 570,243 |  |  | 1,425,768 |  |  | 1,996,011 |
Auto | 657,773 |  |  | 774,517 |  |  | 1,432,290 |
Short-tail lines (2) | 356,373 |  |  | 452,940 |  |  | 809,313 |
Total Insurance | 4,529,075 |  |  | 8,241,388 |  |  | 12,770,463 |
Reinsurance & Monoline Excess (1) (3) | 1,658,934 |  |  | 1,576,959 |  |  | 3,235,893 |
Total | $ | 6,188,009 |  |  | $ | 9,818,347 |  |  | $ | 16,006,356 |
December 31, 2023 |  |  |  |  |
Other liability | $ | 1,912,594 |  |  | $ | 4,607,507 |  |  | $ | 6,520,101 |
Workers’ compensation (1) | 1,019,445 |  |  | 790,944 |  |  | 1,810,389 |
Professional liability | 527,555 |  |  | 1,438,102 |  |  | 1,965,657 |
Auto | 645,707 |  |  | 700,850 |  |  | 1,346,557 |
Short-tail lines (2) | 375,129 |  |  | 412,369 |  |  | 787,498 |
Total Insurance | 4,480,430 |  |  | 7,949,772 |  |  | 12,430,202 |
Reinsurance & Monoline Excess (1) (3) | 1,673,581 |  |  | 1,558,037 |  |  | 3,231,618 |
Total | $ | 6,154,011 |  |  | $ | 9,507,809 |  |  | $ | 15,661,820 |

___________
(1) Reserves for workers’ compensation and Reinsurance & Monoline Excess are net of an aggregate net discount of $378 million and $390 million as of March 31, 2024 and December 31, 2023, respectively.
(2) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery, high net worth homeowners and other lines.
(3) Reinsurance & Monoline Excess includes property and casualty reinsurance, as well as operations that solely retain risk on an excess basis and certain program management business.
The Company evaluates reserves for losses and loss adjustment expenses on a quarterly basis. Changes in estimates of prior year losses are reported when such changes are made. The changes in prior year loss reserve estimates are generally the result of ongoing analysis of recent loss development trends. Original estimates are increased or decreased as additional information becomes known regarding individual claims and aggregate claim trends.
Certain of the Company's insurance and reinsurance contracts are retrospectively rated, whereby the Company collects more or less premiums based on the level of loss activity. For those contracts, changes in loss and loss adjustment expenses for prior years may be fully or partially offset by additional or return premiums.
Net prior year development (i.e., the sum of prior year reserve changes and prior year earned premiums changes) for the three months ended March 31, 2024 and 2023 are as follows:
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(In thousands) | 2024 |  | 2023 |  |
Increase in prior year loss reserves | $ | (7,367) |  |  | $ | (28,205) |  |  |
Increase in prior year earned premiums | 8,091 |  |  | 4,313 |  |  |
Net favorable (unfavorable) prior year development | $ | 724 |  |  | $ | (23,892) |  |  |

The ultimate net impact of COVID-19 on the Company’s reserves remains uncertain. As of March 31, 2024, the Company had recognized losses for COVID-19-related claims activity, net of reinsurance, of approximately $386 million, of which $328 million relates to the Insurance segment and $58 million relates to the Reinsurance & Monoline Excess segment. Such $386 million of COVID-19-related losses included $383 million of reported losses and $3 million of IBNR.
During the three months ended March 31, 2024, favorable prior year development (net of additional and return premiums) of $1 million included $9 million for the Reinsurance & Monoline Excess segment largely offset by $8 million of adverse prior year development for the Insurance segment.
For the Insurance segment, the adverse development during the first quarter of 2024 was driven by commercial auto liability and excess other liability, including umbrella, and was partially offset by favorable development for workers’ compensation and professional liability. The adverse commercial auto liability development was concentrated in accident years 2019 through 2023, while the excess other liability, including umbrella, development was focused in accident years 2017 through 2021. A significant portion of the excess other liability, including umbrella, development related to underlying commercial auto exposures. The Company believes that commercial auto-related claims are being particularly impacted by social inflation, which is contributing to an increase in the frequency of large losses beyond expectations. Social inflation can include higher settlement demands from plaintiffs, use of aggressive actions by the plaintiffs' bar such as litigation funding, negative public sentiment towards large businesses and corporations, and erosion of tort reforms, among others.
The favorable workers’ compensation development for the Insurance segment was mainly related to accident years 2018 through 2023, while the favorable professional liability development was mainly in accident years 2021 and 2022. For workers’ compensation, favorable reported claim frequency, below expectations, continued to drive the favorable reserve development. For professional liability, the reported loss experience for the 2021 and 2022 accident years was better than expected. These accident years also feature business written at peak pricing levels, which the Company now believes will result in higher profitability than initially anticipated.
For the Reinsurance & Monoline Excess segment, the favorable development was driven mainly by favorable development in excess workers’ compensation, partially offset by adverse development in the non-proportional reinsurance assumed liability line of business. The favorable excess workers’ compensation development was driven by continued lower claim frequency and reported losses relative to expectations, and to favorable claim settlements spread across many prior accident years. The unfavorable development for non-proportional reinsurance was concentrated mainly in accident years 2017 through 2019 and was associated primarily with our U.S. and U.K. excess general liability reinsurance businesses, including accounts reinsuring construction projects.
During the three months ended March 31, 2023, adverse prior year development (net of additional and return premiums) of $24 million included $12 million for the Insurance segment and $12 million for the Reinsurance & Monoline Excess segment.
This overall adverse development for both segments was primarily attributable to property catastrophe losses related to 2022 events which were still being adjusted and settled during the first quarter of 2023. In particular, losses related to U.S. winter storms which occurred during the month of December were a significant driver of the development, as information gathering and evaluation of many of these losses were still ongoing into 2023.
In addition to the property prior year adverse development discussed above, during the first quarter of 2023, the Insurance segment experienced adverse prior year development on casualty lines for the 2016 through 2019 accident years, which was offset by favorable prior year development on casualty lines for the 2022 accident year. The adverse development on the 2016 through 2019 accident years was concentrated in the other liability line of business, and to a lesser degree, professional liability, including medical professional. The development, which particularly impacted business attaching excess of primary policy limits, was driven by a larger than expected number of large losses reported. The Company believes social inflation contributed to an increase in the frequency of large losses for these accident years. Social inflation can include higher settlement demands from plaintiffs, use of tactics such as litigation funding by the plaintiffs’ bar, negative public sentiment towards large businesses and corporations, and erosion of tort reforms, among others.
The favorable prior year development on casualty lines for the 2022 accident year in the Insurance segment was concentrated in the other liability, professional liability, and workers’ compensation lines of business. Due to uncertainty regarding incurred loss frequency and severity in light of ongoing social inflation and the emergence from the COVID-19 pandemic, the Company set its initial loss ratios for the 2022 accident year prudently, and largely maintained these estimates
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through the end of 2022. The reported loss experience for these lines of business for the 2022 accident year was significantly better than expected, and the Company reacted to this favorable emergence in the first quarter of 2023.
Reserve Discount. The Company discounts its liabilities for certain workers’ compensation reserves. The amount of workers’ compensation reserves that were discounted was $1,311 million and $1,352 million at March 31, 2024 and December 31, 2023, respectively. The aggregate net discount for those reserves, after reflecting the effects of ceded reinsurance, was $378 million and $390 million at March 31, 2024 and December 31, 2023, respectively. At March 31, 2024, discount rates by year ranged from 0.7% to 6.5%, with a weighted average discount rate of 3.5%.
Substantially all of the workers’ compensation discount (97% of total discounted reserves at March 31, 2024) relates to excess workers’ compensation reserves. In order to properly match loss expenses with income earned on investment securities supporting the liabilities, reserves for excess workers’ compensation business are discounted using risk-free discount rates determined by reference to the U.S. Treasury yield curve. These rates are determined annually based on the weighted average rate for the period. Once established, no adjustments are made to the discount rate for that period, and any increases or decreases in loss reserves in subsequent years are discounted at the same rate, without regard to when any such adjustments are recognized. The expected loss and loss expense payout patterns subject to discounting are derived from the Company’s loss payout experience.
The Company also discounts reserves for certain other long-duration workers’ compensation reserves (representing approximately 3% of total discounted reserves at March 31, 2024), including reserves for quota share reinsurance and reserves related to losses regarding occupational lung disease. These reserves are discounted at statutory rates permitted by the Department of Insurance of the State of Delaware.
Assumed Reinsurance Premiums. The Company estimates the amount of assumed reinsurance premiums that it will receive under treaty reinsurance agreements at the inception of the contracts. These premium estimates are revised as the actual amount of assumed premiums is reported to the Company by the ceding companies. As estimates of assumed premiums are made or revised, the related amount of earned premiums, commissions and incurred losses associated with those premiums are recorded. Estimated assumed premiums receivable were approximately $63 million at March 31, 2024 and $65 million at December 31, 2023. The assumed premium estimates are based upon terms set forth in reinsurance agreements, information received from ceding companies during the underwriting and negotiation of agreements, reports received from ceding companies and discussions and correspondence with reinsurance intermediaries. The Company also considers its own view of market conditions, economic trends and experience with similar lines of business. These premium estimates represent management’s best estimate of the ultimate amount of premiums to be received under its assumed reinsurance agreements.
Allowance for Expected Credit Losses on Investments.
Fixed Maturity Securities – For fixed maturity securities in an unrealized loss position where the Company intends to sell, or it is more likely than not that it will be required to sell the security before recovery in value, the amortized cost basis is written down to fair value through net investment gains (losses). For fixed maturity securities in an unrealized loss position where the Company does not intend to sell, or it is more likely than not that it will not be required to sell the security before recovery in value, the Company evaluates whether the decline in fair value has resulted from credit losses or all other factors (non-credit factors). In making this assessment, the Company considers the extent to which fair value is less than amortized cost, changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, an allowance for expected credit losses is recorded for the credit loss through net investment gains (losses), limited by the amount that the fair value is less than the amortized cost basis. The allowance is adjusted for any change in expected credit losses and subsequent recoveries through net investment gains (losses). The impairment related to non-credit factors is recognized in other comprehensive income (loss).
The Company’s credit assessment of allowance for expected credit losses uses a third party model for available for sale and held to maturity securities, as well as loans receivable. The allowance for expected credit losses is generally based on the performance of the underlying collateral under various economic and default scenarios that involve subjective judgments and estimates by management. Modeling these securities involves various factors, such as projected default rates, the nature and realizable value of the collateral, if any, the ability of the issuer to make scheduled payments, historical performance and other relevant economic and performance factors. A discounted cash flow analysis is used to ascertain the amount of the allowance for expected credit losses, if any. In general, the model reverts to the rating-level long-term average marginal default rates based on 10 years of historical data, beyond the forecast period. For other inputs, the model in most cases reverts to the baseline long-term assumptions linearly over 5 years beyond the forecast period. The long-term assumptions are based on the historical averages.
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The Company classifies its fixed maturity securities by credit rating, primarily based on ratings assigned by credit rating agencies. For purposes of classifying securities with different ratings, the Company uses the average of the credit ratings assigned, unless in limited situations the Company’s own analysis indicates an internal rating is more appropriate. Securities that are not rated by a rating agency are evaluated and classified by the Company on a case-by-case basis.
A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at March 31, 2024 is presented in the table below:

($ in thousands) | Number of Securities |  | Aggregate Fair Value |  | Gross Unrealized Loss
Foreign government | 36 |  |  | $ | 93,212 |  |  | $ | 141,742 |
State and municipal | 5 |  |  | 24,438 |  |  | 4,918 |
Corporate | 25 |  |  | 42,772 |  |  | 2,291 |
Mortgage-backed | 15 |  |  | 4,526 |  |  | 237 |
Asset-backed | 4 |  |  | 86 |  |  | 70 |
Total | 85 |  |  | $ | 165,034 |  |  | $ | 149,258 |

As of March 31, 2024, the Company has recorded an allowance for expected credit losses on fixed maturity securities of $23 million. The Company has evaluated the remaining fixed maturity securities in an unrealized loss position and believes the unrealized losses are due primarily to temporary market and sector-related factors rather than to issuer-specific factors. None of these securities are delinquent or in default under financial covenants. Based on its assessment of these issuers, the Company expects them to continue to meet their contractual payment obligations as they become due.
Loans Receivable – For loans receivable, the Company estimates an allowance for expected credit losses based on relevant information about past events, including historical loss experience, current conditions and forecasts that affect the expected collectability of the amortized cost of the financial asset. The allowance for expected credit losses is presented as a reduction to amortized cost of the financial asset in the consolidated balance sheet and changes to the estimate for expected credit losses are recognized through net investment gains (losses). Loans receivable are reported net of an allowance for expected credit losses of $3 million as of both March 31, 2024 and December 31, 2023.
Fair Value Measurements. The Company’s fixed maturity available for sale securities, equity securities, and its arbitrage trading account securities are carried at fair value. Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for similar assets in active markets. Level 3 inputs are unobservable inputs for the asset or liability. Unobservable inputs may only be used to measure fair value to the extent that observable inputs are not available. The fair value of the vast majority of the Company’s portfolio is based on observable data (other than quoted prices) and, accordingly, is classified as Level 2.
In classifying particular financial securities in the fair value hierarchy, the Company uses its judgment to determine whether the market for a security is active and whether significant pricing inputs are observable. The Company determines the existence of an active market by assessing whether transactions occur with sufficient frequency and volume to provide reliable pricing information. The Company determines whether inputs are observable based on the use of such information by pricing services and external investment managers, the uninterrupted availability of such inputs, the need to make significant adjustments to such inputs and the volatility of such inputs over time. If the market for a security is determined to be inactive or if significant inputs used to price a security are determined to be unobservable, the security is categorized in Level 3 of the fair value hierarchy.
Because many fixed maturity securities do not trade on a daily basis, the Company utilizes pricing models and processes which may include benchmark curves, benchmarking of like securities, sector groupings and matrix pricing. Market inputs used to evaluate securities include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data. Quoted prices are often unavailable for recently issued securities that are infrequently traded or securities that are only traded in private transactions. For publicly traded securities for which quoted prices are unavailable, the Company determines fair value based on independent broker quotations and other observable market data. For securities traded only in private negotiations, the Company determines fair value based primarily on the cost of such securities, which is adjusted to reflect prices of recent placements of securities of the same issuer, financial data, projections and business developments of the issuer and other relevant information.
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The following is a summary of pricing sources for the Company's fixed maturity securities available for sale as of March 31, 2024:

($ in thousands) | Carrying Value |  | Percent of Total
Pricing source: |  |  |
Independent pricing services | $ | 20,347,668 |  |  | 97.3 | %
Syndicate manager | 94,481 |  |  | 0.5 |
Directly by the Company based on: |  |  |
Observable data | 468,723 |  |  | 2.2 |
Total | $ | 20,910,872 |  |  | 100.0 | %

Independent pricing services – Substantially all of the Company’s fixed maturity securities available for sale were priced by independent pricing services (generally one U.S. pricing service plus additional pricing services with respect to a limited number of foreign securities held by the Company). The prices provided by the independent pricing services are generally based on observable market data in active markets (e.g., broker quotes and prices observed for comparable securities). The determination of whether markets are active or inactive is based upon the volume and level of activity for a particular asset class. The Company reviews the prices provided by pricing services for reasonableness based upon current trading levels for similar securities. If the prices appear unusual to the Company, they are re-examined and the value is either confirmed or revised. In addition, the Company periodically performs independent price tests of a sample of securities to ensure proper valuation and to verify our understanding of how securities are priced. As of March 31, 2024, the Company did not make any adjustments to the prices provided by the pricing services. Based upon the Company’s review of the methodologies used by the independent pricing services, these securities were classified as Level 2.
Syndicate manager – The Company has a 15% participation in a Lloyd’s syndicate, and the Company’s share of the securities owned by the syndicate is priced by the syndicate’s manager. The majority of the securities are liquid, short duration fixed maturity securities. The Company reviews the syndicate manager’s pricing methodology and audited financial statements and holds discussions with the syndicate manager as necessary to confirm its understanding and agreement with security prices. Based upon the Company’s review of the methodologies used by the syndicate manager, these securities were classified as Level 2.
Observable data – If independent pricing is not available, the Company prices the securities directly. Prices are based on observable market data where available, including current trading levels for similar securities and non-binding quotations from brokers. The Company generally requests two or more quotes. If more than one quote is received, the Company sets a price within the range of quotes received based on its assessment of the credibility of the quote and its own evaluation of the security. The Company generally does not adjust quotes obtained from brokers. Since these securities were priced based on observable data, they were classified as Level 2.
Cash flow model – If the above methodologies are not available, the Company prices securities using a discounted cash flow model based upon assumptions as to prevailing credit spreads, interest rates and interest rate volatility, time to maturity and subordination levels. Discount rates are adjusted to reflect illiquidity where appropriate. These securities were classified as Level 3.
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Results of Operations for the Three Months Ended March 31, 2024 and 2023
Business Segment Results
Following is a summary of gross and net premiums written, net premiums earned, loss ratios (losses and loss expenses incurred expressed as a percentage of net premiums earned), expense ratios (underwriting expenses expressed as a percentage of net premiums earned) and GAAP combined ratios (sum of loss ratio and expense ratio) for each of our business segments for the three months ended March 31, 2024 and 2023. The GAAP combined ratio represents a measure of underwriting profitability, excluding investment income. A GAAP combined ratio in excess of 100 indicates an underwriting loss; a number below 100 indicates an underwriting profit.

($ in thousands) | 2024 |  | 2023
Insurance: |  |  |
Gross premiums written | $ | 2,921,050 |  |  | $ | 2,626,346 |
Net premiums written | 2,445,715 |  |  | 2,185,421 |
Net premiums earned | 2,398,768 |  |  | 2,142,924 |
Loss ratio | 61.8 | % |  | 62.6 | %
Expense ratio | 28.4 | % |  | 28.6 | %
GAAP combined ratio | 90.2 | % |  | 91.2 | %
Reinsurance & Monoline Excess: |  |  |
Gross premiums written | $ | 441,705 |  |  | $ | 422,971 |
Net premiums written | 405,576 |  |  | 389,403 |
Net premiums earned | 365,579 |  |  | 348,508 |
Loss ratio | 49.8 | % |  | 56.4 | %
Expense ratio | 29.8 | % |  | 30.2 | %
GAAP combined ratio | 79.6 | % |  | 86.6 | %
Consolidated: |  |  |
Gross premiums written | $ | 3,362,755 |  |  | $ | 3,049,317 |
Net premiums written | 2,851,291 |  |  | 2,574,824 |
Net premiums earned | 2,764,347 |  |  | 2,491,432 |
Loss ratio | 60.2 | % |  | 61.8 | %
Expense ratio | 28.6 | % |  | 28.8 | %
GAAP combined ratio | 88.8 | % |  | 90.6 | %

Net Income to Common Stockholders. The following table presents the Company’s net income to common stockholders and net income per diluted share for the three months ended March 31, 2024 and 2023:

(In thousands, except per share data) | 2024 |  | 2023
Net income to common stockholders | $ | 442,471 |  |  | $ | 294,126 |
Weighted average diluted shares | 270,505 |  |  | 277,339 |
Net income per diluted share | $ | 1.64 |  |  | $ | 1.06 |

The Company reported net income to common stockholders of $442 million in 2024 compared to $294 million in 2023. The $148 million increase in net income was primarily due to an after-tax increase in net investment income of $74 million mainly due to higher interest rates, a larger fixed maturity securities portfolio and investment income associated with our Argentine inflation-linked securities, partially offset by investment fund losses, an after-tax increase in underwriting income of $58 million due to growth in premium rates, an after-tax increase in foreign currency gains of $18 million mainly due to the strengthening of the U.S. dollar against other currencies in 2024, an after-tax reduction in corporate expenses of $3 million, an after-tax increase in net investment gains of $2 million and an after-tax increase in minority interest of $2 million, partially offset by an increase of $6 million in tax expense due to a change in the effective tax rate and an after-tax reduction in profit from insurance service businesses of $3 million. The number of weighted average diluted shares decreased 6.8 million for 2024 compared to 2023, mainly reflecting shares repurchased in 2023.
Premiums. Gross premiums written were $3,363 million in 2024, an increase of 10% from $3,049 million in 2023. The increase was due to a $295 million increase in the Insurance segment and a $19 million increase in the Reinsurance & Monoline Excess segment. Approximately 81% of premiums expiring in 2024 were renewed, and 79% of premiums expiring in 2023 were renewed.
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Average renewal premium rates for insurance and facultative reinsurance increased 6.7% in 2024 when adjusted for changes in exposures, and increased 7.8% excluding workers' compensation.
A summary of gross premiums written in 2024 compared with 2023 by line of business within each business segment follows:
•Insurance - gross premiums increased 11% to $2,921 million in 2024 from $2,626 million in 2023. Gross premiums increased $134 million (21%) for short-tail lines, $133 million (13%) for other liability and $54 million (18%) for auto, partially offset by a reduction of $21 million (6%) for professional liability and $5 million (2%) for workers' compensation.
•Reinsurance & Monoline Excess - gross premiums increased 4% to $442 million in 2024 from $423 million in 2023. Gross premiums increased $27 million (32%) for property and $13 million (11%) for monoline excess, partially offset by a reduction of $21 million (10%) for casualty.
Net premiums written were $2,851 million in 2024, an increase of 11% from $2,575 million in 2023. Ceded reinsurance premiums as a percentage of gross written premiums were 15% in 2024 and 16% in 2023.
Premiums earned increased 11% to $2,764 million in 2024 from $2,491 million in 2023. Insurance premiums (including the impact of rate changes) are generally earned evenly over the policy term, and accordingly, recent rate increases will be earned over the upcoming quarters. Premiums earned in 2024 are related to business written during both 2024 and 2023. Audit premiums were $88 million in 2024 compared with $91 million in 2023.
Net Investment Income. Following is a summary of net investment income for the three months ended March 31, 2024 and 2023:

| Amount |  | Average Annualized Yield
($ in thousands) | 2024 |  | 2023 |  | 2024 |  | 2023
Fixed maturity securities, including cash and cash equivalents and loans receivable | $ | 335,248 |  |  | $ | 195,642 |  |  | 5.9 | % |  | 3.8 | %
Arbitrage trading account | 18,011 |  |  | 18,256 |  |  | 5.8 |  |  | 6.2 |
Equity securities | 11,336 |  |  | 13,746 |  |  | 4.6 |  |  | 4.8 |
Investment funds | (29,349) |  |  | 2,180 |  |  | (7.4) |  |  | 0.5 |
Real estate | (13,163) |  |  | (3,711) |  |  | (4.2) |  |  | (1.1) |
Gross investment income | 322,083 |  |  | 226,113 |  |  | 4.6 |  |  | 3.5 |
Investment expenses | (2,244) |  |  | (2,715) |  |  | — |  |  | — |
Total | $ | 319,839 |  |  | $ | 223,398 |  |  | 4.6 | % |  | 3.5 | %

Net investment income increased 43% to $320 million in 2024 from $223 million in 2023 due primarily to a $140 million increase in income from fixed maturity securities mainly driven by higher interest rates, a larger fixed maturity securities portfolio and our Argentine inflation-linked securities (see below for further discussion), and a $1 million reduction in investment expenses, partially offset by a $32 million decrease in income from investment funds primarily due to transportation funds and financial services funds, a $10 million decrease in real estate and a $2 million decrease in equity securities. The Company expects investment income to benefit as it continues to invest maturing securities at the current higher rates. The Company maintained the shortened duration of its fixed maturity security portfolio, with a small increase in average duration from 2.4 to 2.5 years, thereby reducing the potential impact of mark-to-market on the portfolio and positioning the Company to react quickly to changes in the current interest rate environment. Average invested assets, at cost (including cash and cash equivalents), were $27.9 billion in 2024 up 8.7% from $25.7 billion in 2023.
As of March 31, 2024, the book value of the Company's investments in Argentine bonds was $295 million, which is comprised of inflation-linked securities of $173 million and other Argentine bonds of $122 million (of these other Argentine bonds, $113 million are U.S. dollar-denominated). Pre-tax net investment income associated with these inflation-linked securities for the quarter ended March 31, 2024 was $96 million. Such investment income increased as a result of an adjustment to the inflation rate that was made by the Argentine government in late 2023. As certain of our Argentine bonds matured in the first quarter, we do not expect investment income relating to these securities to continue at this level. The proceeds from the Argentine inflation-linked securities that matured in the first quarter of 2024 have been reinvested.
Insurance Service Fees. The Company earns fees from an insurance distribution business (part of which was sold in June 2023), a third-party administrator and as a servicing carrier of workers' compensation assigned risk plans for certain states.
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Insurance service fees were $25 million in 2024 and $33 million in 2023. The decrease in service fees resulted from the sale of the property and casualty insurance services division of Breckenridge IS, Inc.
Net Realized and Unrealized Gains on Investments. The Company buys and sells securities and other investment assets on a regular basis in order to maximize its total return on investments. Decisions to sell securities and other investment assets are based on management’s view of the underlying fundamentals of specific investments as well as management’s expectations regarding interest rates, credit spreads, currency values and general economic conditions. Net realized and unrealized gains on investments were $12 million in 2024 compared with $23 million in 2023. The gains of $12 million in 2024 reflected an increase in unrealized gains on equity securities of $26 million partially offset by net realized losses on investments of $14 million. The gains of $23 million in 2023 reflected an increase in unrealized gains on equity securities of $43 million partially offset by net realized losses on investments of $20 million.
Change in Allowance for Expected Credit Losses on Investments. Based on credit factors, the allowance for expected credit losses is increased or decreased depending on the percentage of unrealized loss relative to amortized cost by security, changes in rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. The pre-tax change in allowance for expected credit losses on investments decreased by $14 million ($11 million after-tax) and $399 thousand ($315 thousand after-tax) in 2024 and 2023, respectively, which are both reflected in net investment gains, primarily due to a change in estimate.
Revenues from Non-Insurance Businesses. Revenues from non-insurance businesses were derived from businesses engaged in the distribution of promotional merchandise, world-wide textile solutions and aviation-related businesses that provide services to aviation markets, including (i) the distribution, manufacturing, repair and overhaul of aircraft parts and components, (ii) the sale of new and used aircraft, and (iii) avionics, fuel, maintenance, storage and charter services. Revenues from non-insurance businesses were $121 million in 2024 and $124 million in 2023. The decrease mainly relates to aviation-related business and promotional merchandise, partially offset by an increase in the commercial and residential textile business.
Losses and Loss Expenses. Losses and loss expenses increased to $1,664 million in 2024 from $1,539 million in 2023. The consolidated loss ratio was 60.2% in 2024 and 61.8% in 2023. Catastrophe losses, net of reinsurance recoveries, were $31 million in 2024 and $48 million in 2023. Favorable prior year reserve development (net of premium offsets) was $1 million in 2024 and adverse prior year reserve development was $24 million in 2023. The loss ratio excluding catastrophe losses and prior year reserve development increased 0.2 points to 59.1% in 2024 from 58.9% in 2023.
A summary of loss ratios in 2024 compared with 2023 by business segment follows:
•Insurance - The loss ratio was 61.8% in 2024 and 62.6% in 2023. Catastrophe losses were $28 million in 2024 compared with $45 million in 2023. Adverse prior year reserve development was $8 million in 2024 and $12 million in 2023. The loss ratio excluding catastrophe losses and prior year reserve development increased 0.3 points to 60.3% in 2024 from 60.0% in 2023.
•Reinsurance & Monoline Excess - The loss ratio was 49.8% in 2024 and 56.4% in 2023. Catastrophe losses were $3 million in both 2024 and 2023. Favorable prior year reserve development was $9 million in 2024, and adverse prior year reserve development was $12 million in 2023. The loss ratio excluding catastrophe losses and prior year reserve development decreased 0.9 points to 51.4% in 2024 from 52.3% in 2023.
Other Operating Costs and Expenses. Following is a summary of other operating costs and expenses for the three months ended March 31, 2024 and 2023:

($ in thousands) | 2024 |  | 2023
Policy acquisition and insurance operating expenses | $ | 791,532 |  |  | $ | 718,276 |
Insurance service expenses | 21,439 |  |  | 25,180 |
Net foreign currency (gains) losses | (13,177) |  |  | 9,495 |
Other costs and expenses | 68,795 |  |  | 72,624 |
Total | $ | 868,589 |  |  | $ | 825,575 |

Policy acquisition and insurance operating expenses are comprised of commissions paid to agents and brokers, premium taxes and other assessments and internal underwriting costs. Policy acquisition and insurance operating expenses increased 10% and net premiums earned increased 11% from 2023. The expense ratio (underwriting expenses expressed as a percentage of net premiums earned) decreased 0.2 points to 28.6% in 2024 from 28.8% in 2023 mainly due to a non-recurring benefit associated with compensation costs.
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Service expenses, which represent the costs associated with the fee-based businesses, was $21 million in 2024, down from $25 million in 2023, as a result of the sale of the property and casualty insurance services division of Breckenridge IS, Inc.
Net foreign currency (gains) losses result from transactions denominated in a currency other than a company's operating functional currency. Net foreign currency gains were $13 million in 2024 compared to losses of $9 million in 2023, primarily due to the strengthening of the U.S. dollar against other currencies in 2024.
Other costs and expenses represent general and administrative expenses of the parent company and other expenses not allocated to business segments, including the cost of certain long-term incentive plans and new business ventures. Other costs and expenses decreased to $69 million in 2024 from $73 million in 2023, primarily due to lower compensation-related costs.
Expenses from Non-Insurance Businesses. Expenses from non-insurance businesses represent costs associated with businesses engaged in the distribution of promotional merchandise, world-wide textile solutions and aviation-related businesses that include (i) cost of goods sold related to aircraft and products sold and services provided, and (ii) general and administrative expenses. Expenses from non-insurance businesses were $119 million in 2024 compared to $123 million in 2023. The decrease mainly relates to aviation-related business and promotional merchandise, partially offset by an increase in the commercial and residential textile business.
Interest Expense. Interest expense was $32 million in both 2024 and 2023.
Income Taxes. The effective income tax rate was 23.0% and 21.4% for the three months ended March 31, 2024 and 2023, respectively. The higher effective income tax rate for the three months ended March 31, 2024, as compared to the earlier period, was primarily due to the geographical mix of earnings and larger amounts being subject to tax at a rate greater than the U.S. statutory rate.
The Company has not provided U.S. deferred income taxes on the undistributed earnings of approximately $335 million of its non-U.S. subsidiaries since these earnings are intended to be permanently reinvested in the non-U.S. subsidiaries. In the future, if such earnings were distributed, the Company projects that the incremental tax, if any, will be immaterial.
From 2023, as part of the Inflation Reduction Act of 2022, a 1% excise tax is imposed on common share repurchase activity, net of common share issuances, and included in the cost of treasury stock acquired. During the three months ended March 31, 2024, the Company did not repurchase any shares of its common stock.
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Investments
As part of its investment strategy, the Company establishes a level of cash and highly liquid short-term and intermediate-term securities that, combined with expected cash flow, it believes is adequate to meet its payment obligations. In addition to fixed maturity securities, the Company invests in equity securities, merger arbitrage securities, investment funds, private equity, loans and real estate related assets. The Company's investments in investment funds and its other alternative investments have experienced, and the Company expects to continue to experience, greater fluctuations in investment income.
The Company also attempts to maintain an appropriate relationship between the average duration of the investment portfolio and the approximate duration of its liabilities (i.e., policy claims and debt obligations). The average duration of the fixed maturity portfolio, including cash and cash equivalents, was 2.5 years at March 31, 2024 and 2.4 years at December 31, 2023. The Company’s fixed maturity investment portfolio and investment-related assets as of March 31, 2024 were as follows:

($ in thousands) | Carrying Value |  | Percent of Total
Fixed maturity securities: |  |  |
U.S. government and government agencies | $ | 1,829,552 |  |  | 6.6 | %
State and municipal: |  |  |
Special revenue | 1,546,112 |  |  | 5.6 |
State general obligation | 430,544 |  |  | 1.6 |
Local general obligation | 382,778 |  |  | 1.4 |
Corporate backed | 155,519 |  |  | 0.6 |
Pre-refunded (1) | 89,053 |  |  | 0.3 |
Total state and municipal | 2,604,006 |  |  | 9.5 |
Mortgage-backed: |  |  |
Agency | 1,612,183 |  |  | 5.8 |
Commercial | 609,880 |  |  | 2.2 |
Residential-Prime | 185,957 |  |  | 0.7 |
Residential-Alt A | 2,760 |  |  | — |
Total mortgage-backed | 2,410,780 |  |  | 8.7 |
Asset-backed | 4,239,561 |  |  | 15.4 |
Corporate: |  |  |
Industrial | 3,734,275 |  |  | 13.5 |
Financial | 3,113,296 |  |  | 11.3 |
Utilities | 729,662 |  |  | 2.6 |
Other | 585,470 |  |  | 2.1 |
Total corporate | 8,162,703 |  |  | 29.5 |
Foreign government and foreign government agencies | 1,718,252 |  |  | 6.2 |
Total fixed maturity securities | 20,964,854 |  |  | 75.9 |
Equity securities: |  |  |
Common stocks | 846,669 |  |  | 3.1 |
Preferred stocks | 331,379 |  |  | 1.2 |
Total equity securities | 1,178,048 |  |  | 4.3 |
Investment funds | 1,555,818 |  |  | 5.6 |
Real estate | 1,273,063 |  |  | 4.6 |
Cash and cash equivalents (2) | 1,237,005 |  |  | 4.5 |
Arbitrage trading account | 1,146,119 |  |  | 4.2 |
Loans receivable | 228,766 |  |  | 0.9 |
Total investments | $ | 27,583,673 |  |  | 100.0 | %

____________________
(1) Pre-refunded securities are securities for which an escrow account has been established to fund the remaining payments of principal and interest through maturity. Such escrow accounts are funded almost exclusively with U.S. Treasury and U.S. government agency securities.
(2) Cash and cash equivalents includes trading accounts receivable from brokers and clearing organizations, trading account securities sold but not yet purchased and unsettled purchases.
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Fixed Maturity Securities. The Company’s investment policy with respect to fixed maturity securities is generally to purchase instruments with the expectation of holding them to their maturity. However, management of the available for sale portfolio is considered necessary to maintain an approximate matching of assets and liabilities as well as to adjust the portfolio as a result of changes in financial market conditions and tax considerations.
The Company’s philosophy related to holding or selling fixed maturity securities is based on its objective of maximizing total return. The key factors that management considers in its investment decisions as to whether to hold or sell fixed maturity securities are its view of the underlying fundamentals of specific securities as well as its expectations regarding interest rates, credit spreads and currency values. In a period in which management expects interest rates to rise, the Company may sell longer duration securities in order to mitigate the impact of an interest rate rise on the fair value of the portfolio. Similarly, in a period in which management expects credit spreads to widen, the Company may sell lower quality securities, and in a period in which management expects certain foreign currencies to decline in value, the Company may sell securities denominated in those foreign currencies. The sale of fixed maturity securities in order to achieve the objective of maximizing total return may result in realized gains or losses; however, there is no reason to expect these gains or losses to continue in future periods.
Equity Securities. Equity securities primarily represent investments in common and preferred stocks in companies with potential growth opportunities in different sectors, mainly in the financial institutions, energy and technology sectors.
Investment Funds. At March 31, 2024, the carrying value of investment funds was $1.6 billion, including investments in financial services funds of $419 million, other funds of $380 million (which includes a deferred compensation trust asset of $41 million), transportation funds of $296 million, real estate funds of $189 million, infrastructure funds of $137 million and energy funds of $134 million. Investment funds are generally reported on a one-quarter lag.
Real Estate. Real estate is directly owned property held for investment. At March 31, 2024, real estate properties in operation included a long-term ground lease in Washington D.C., an office complex in New York City and the completed portion of a mixed-use project in Washington D.C. In addition, part of the previously mentioned mixed-use project in Washington D.C. is under development. The Company expects to fund further development costs for the project with a combination of its own funds and external financing.
Arbitrage Trading Account. The arbitrage trading account is comprised of direct investments in arbitrage securities. Merger arbitrage is the business of investing in the securities of publicly held companies that are the targets in announced tender offers and mergers.
Loans Receivable. Loans receivable, which are carried at amortized cost (net of allowance for expected credit losses), had an amortized cost of $229 million and an aggregate fair value of $229 million at March 31, 2024. The amortized cost of loans receivable is net of an allowance for expected credit losses of $3 million as of March 31, 2024. Loans receivable include real estate loans of $228 million that are secured by commercial and residential real estate located primarily in the UK and New York. Real estate loans generally earn interest at fixed or stepped interest rates and have maturities through 2026. Loans receivable include commercial loans of $1 million that are secured by business assets and have fixed interest rates with varying maturities not exceeding 10 years.
Market Risk. The fair value of the Company’s investments is subject to risks of fluctuations in credit quality and interest rates. The Company uses various models and stress test scenarios to monitor and manage interest rate risk. The Company attempts to manage its interest rate risk by maintaining an appropriate relationship between the effective duration of the investment portfolio and the approximate duration of its liabilities (i.e., policy claims and debt obligations). The effective duration for the fixed maturity portfolio (including cash and cash equivalents) was 2.5 years at March 31, 2024 and 2.4 years at December 31, 2023.
In addition, the fair value of the Company’s international investments is subject to currency risk. The Company attempts to manage its currency risk by matching its foreign currency assets and liabilities where considered appropriate.
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Liquidity and Capital Resources
Cash Flow. Cash flow provided from operating activities increased to $746 million in the three months ended March 31, 2024 from $445 million in the three months ended March 31, 2023, primarily due to increased premium receipts and reduced loss and loss expense payments.
The Company's insurance subsidiaries' principal sources of cash are premiums, investment income, service fees and proceeds from sales and maturities of portfolio investments. The principal uses of cash are payments for claims, taxes, operating expenses and dividends. The Company expects its insurance subsidiaries to fund the payment of losses with cash received from premiums, investment income and fees. The Company generally targets an average duration for its investment portfolio that is within 1.5 years of the average duration of its liabilities so that portions of its investment portfolio mature throughout the claim cycle and are available for the payment of claims if necessary. In the event operating cash flow and proceeds from maturities and prepayments of fixed income securities are not sufficient to fund claim payments and other cash requirements, the remainder of the Company's cash and investments is available to pay claims and other obligations as they become due. The Company's investment portfolio is highly liquid, with approximately 80% invested in cash, cash equivalents and marketable fixed maturity securities as of March 31, 2024. If the sale of fixed maturity securities were to become necessary, a realized gain or loss equal to the difference between the cost and sales price of securities sold would be recognized.
Debt. At March 31, 2024, the Company had senior notes, subordinated debentures and other debt outstanding with a carrying value of $2,837 million and a face amount of $2,861 million. The maturities of the outstanding debt are $6 million in 2024, $250 million in 2037, $350 million in 2044, $470 million in 2050, $400 million in 2052, $185 million in 2058, $300 million in 2059, $250 million in 2060, and $650 million in 2061.
On April 1, 2022, the Company entered into a senior unsecured revolving credit facility that provides for revolving, unsecured borrowings up to an aggregate of $300 million with a $50 million sublimit for letters of credit. The Company may increase the amount available under the facility to a maximum of $500 million subject to obtaining lender commitments for the increase and other customary conditions. Borrowings under the facility may be used for working capital and other general corporate purposes. All borrowings under the facility must be repaid by April 1, 2027, except that letters of credit outstanding on that date may remain outstanding until April 1, 2028 (or such later date approved by all lenders). Our ability to utilize the facility is conditioned on the satisfaction of representations, warranties and covenants that are customary for facilities of this type. As of March 31, 2024, there were no borrowings outstanding under the facility.
Equity. At March 31, 2024, total common stockholders’ equity was $7.8 billion, common shares outstanding were 256,548,669 and stockholders’ equity per outstanding share was $30.34. During the three months ended March 31, 2024, the Company did not repurchase any shares of its common stock. In the first quarter of 2024, the board of directors of the Company declared a regular quarterly cash dividend of $0.11 per share. The number of common shares outstanding excludes shares held in a grantor trust established by the Company for delivery upon settlement of vested but mandatorily deferred RSUs.
Total Capital. Total capitalization (equity, debt and subordinated debentures) was $10.6 billion at March 31, 2024. The percentage of the Company’s capital attributable to senior notes, subordinated debentures and other debt was 27% at March 31, 2024 and 28% at December 31, 2023.
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Item 3. Quantitative and Qualitative Disclosure About Market Risk
Reference is made to the information under “Investments - Market Risk” under the caption “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in this Form 10-Q.
Item 4. Controls and Procedures
Disclosure Controls and Procedures. The Company’s management, including its Chief Executive Officer and Chief Financial Officer, has conducted an evaluation of the effectiveness of the Company’s disclosure controls and procedures pursuant to Securities Exchange Act Rule 13a-14 as of the end of the period covered by this quarterly report. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the Company has in place effective controls and procedures designed to ensure that information required to be disclosed by the Company in the reports it files or submits under the Securities Exchange Act of 1934, as amended, and the rules thereunder, is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms.
Changes in Internal Control over Financial Reporting. During the quarter ended March 31, 2024, there were no changes in the Company’s internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.
PART II — OTHER INFORMATION
Item 1. Legal Proceedings
Please see Note 20 to the notes to the interim consolidated financial statements.
Item 1A. Risk Factors
There have been no material changes from the risk factors previously disclosed in the Company’s annual report on Form 10-K for the fiscal year ended December 31, 2023.
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
The Company did not repurchase any of its shares during the three months ended March 31, 2024, and accordingly the number of shares authorized for purchase by the Company remains 13,241,283.
Item 5. Other Information
None of the Company's directors or officers adopted, modified or terminated a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement during the quarter ended March 31, 2024, as such terms are defined under Item 408(a) of Regulation S-K.
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Item 6. Exhibits

Number |  |  |
(10.1) |  | Form of 2024 Performance Unit Award Agreement under the W. R. Berkley Corporation 2019 Long-Term Incentive Plan. |
(31.1) |  | Certification of the Chief Executive Officer pursuant to Rule 13a-14(a)/ 15d-14(a). |
(31.2) |  | Certification of the Chief Financial Officer pursuant to Rule 13a-14(a)/ 15d-14(a). |
(32.1) |  | Certification of the Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. |

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SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned thereunto duly authorized.

|  | W. R. BERKLEY CORPORATION
Date: | May 3, 2024 | /s/ W. Robert Berkley, Jr.
|  | W. Robert Berkley, Jr.
|  | President and Chief Executive Officer
Date: | May 3, 2024 | /s/ Richard M. Baio
|  | Richard M. Baio
|  | Executive Vice President - Chief Financial Officer

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