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v3.25.3

Segment Information - Summary of underwriting income or loss by segment (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) segment | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Number of segments | segment |  |  |  |  | 3 |  |  |
Gross premiums written |  | $ 5,410 |  | $ 5,440 | $ 18,069 |  | $ 16,755 |
Premiums ceded |  | (1,446) |  | (1,393) | (5,242) |  | (4,842) |
Net premiums written |  | 3,964 |  | 4,047 | 12,827 |  | 11,913 |
Change in unearned premiums |  | 321 |  | (77) | (17) |  | (956) |
Net premiums earned |  | 4,285 |  | 3,970 | 12,810 |  | 10,957 |
Other underwriting income |  | 50 |  | 5 | 165 |  | 20 |
Losses and loss adjustment expenses |  | (2,200) |  | (2,403) | (7,090) |  | (5,958) |
Acquisition expenses |  | (786) |  | (681) | (2,374) |  | (1,921) |
Other operating expenses |  | (478) |  | (353) | (1,405) |  | (1,062) |
Underwriting income (loss) |  | 871 |  | 538 | 2,106 |  | 2,036 |
Net investment income |  | 408 |  | 399 | 1,191 |  | 1,090 |
Net realized gains (losses) |  | 210 |  | 169 | 442 |  | 358 |
Equity in net income of investments accounted for using the equity method |  | 134 |  | 171 | 349 |  | 437 |
Other income (loss) |  | 22 |  | 8 | 38 |  | 30 |
Corporate expenses | [1] | (28) |  | (19) | (107) |  | (88) |
Transaction costs and other | [1] | (21) |  | (30) | (49) |  | (55) |
Amortization of intangible assets |  | (49) |  | (88) | (146) |  | (136) |
Interest expense |  | (37) |  | (35) | (110) |  | (104) |
Net foreign exchange gains (losses) |  | (7) |  | (63) | (122) |  | (31) |
Income (loss) before income taxes and income (loss) from operating affiliates |  | 1,503 |  | 1,050 | 3,592 |  | 3,537 |
Income tax expense (benefit) |  | (215) |  | (98) | (550) |  | (296) |
Income (loss) from operating affiliates |  | 62 |  | 36 | 119 |  | 136 |
Net income available to Arch |  | 1,350 |  | 988 | 3,161 |  | 3,377 |
Preferred dividends |  | (10) |  | (10) | (30) |  | (30) |
Net income (loss) available to Arch common shareholders |  | $ 1,340 |  | $ 978 | $ 3,131 |  | $ 3,347 |
Underwriting Ratios |  |  |  |  |  |  |  |
Loss ratio |  | 51.40% |  | 60.50% | 55.40% |  | 54.40% |
Acquisition expense ratio |  | 18.40% |  | 17.20% | 18.50% |  | 17.50% |
Other operating expense ratio | [2] | 10.00% |  |  | 9.70% |  |  |
Other operating expense ratio |  |  |  | 8.90% |  |  | 9.70% |
Combined ratio |  | 79.80% |  | 86.60% | 83.60% |  | 81.60% |
Goodwill and intangible assets |  | $ 1,268 |  | $ 1,486 | $ 1,268 |  | $ 1,486 | $ 1,351
Operating segments | Insurance |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gross premiums written | [3] | 2,567 |  | 2,341 | 7,893 |  | 6,569 |
Premiums ceded | [3] | (614) |  | (521) | (1,971) |  | (1,649) |
Net premiums written |  | 1,953 |  | 1,820 | 5,922 |  | 4,920 |
Change in unearned premiums |  | 16 |  | (55) | (124) |  | (226) |
Net premiums earned |  | 1,969 |  | 1,765 | 5,798 |  | 4,694 |
Other underwriting income |  | 9 | [4] | 0 | 25 | [4] | 0 |
Losses and loss adjustment expenses |  | (1,162) |  | (1,087) | (3,568) |  | (2,789) |
Acquisition expenses |  | (386) |  | (308) | (1,116) |  | (872) |
Other operating expenses | [5] | (301) |  | (250) | (883) |  | (718) |
Underwriting income (loss) |  | $ 129 |  | $ 120 | $ 256 |  | $ 315 |
Underwriting Ratios |  |  |  |  |  |  |  |
Loss ratio |  | 59.00% |  | 61.60% | 61.50% |  | 59.40% |
Acquisition expense ratio |  | 19.60% |  | 17.40% | 19.30% |  | 18.60% |
Other operating expense ratio | [2] | 14.80% |  |  | 14.80% |  |  |
Other operating expense ratio |  |  |  | 14.10% |  |  | 15.30% |
Combined ratio |  | 93.40% |  | 93.10% | 95.60% |  | 93.30% |
Goodwill and intangible assets |  | $ 833 |  | $ 1,025 | $ 833 |  | $ 1,025 |
Operating segments | Reinsurance |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gross premiums written | [3] | 2,515 |  | 2,763 | 9,205 |  | 9,171 |
Premiums ceded | [3] | (778) |  | (818) | (3,093) |  | (3,013) |
Net premiums written |  | 1,737 |  | 1,945 | 6,112 |  | 6,158 |
Change in unearned premiums |  | 278 |  | (53) | 18 |  | (820) |
Net premiums earned |  | 2,015 |  | 1,892 | 6,130 |  | 5,338 |
Other underwriting income |  | 38 | [4] | 2 | 123 | [4] | 5 |
Losses and loss adjustment expenses |  | (1,040) |  | (1,317) | (3,524) |  | (3,206) |
Acquisition expenses |  | (398) |  | (374) | (1,251) |  | (1,050) |
Other operating expenses | [5] | (133) |  | (54) | (378) |  | (193) |
Underwriting income (loss) |  | $ 482 |  | $ 149 | $ 1,100 |  | $ 894 |
Underwriting Ratios |  |  |  |  |  |  |  |
Loss ratio |  | 51.60% |  | 69.60% | 57.50% |  | 60.10% |
Acquisition expense ratio |  | 19.80% |  | 19.80% | 20.40% |  | 19.70% |
Other operating expense ratio | [2] | 4.70% |  |  | 4.20% |  |  |
Other operating expense ratio |  |  |  | 2.90% |  |  | 3.60% |
Combined ratio |  | 76.10% |  | 92.30% | 82.10% |  | 83.40% |
Goodwill and intangible assets |  | $ 100 |  | $ 113 | $ 100 |  | $ 113 |
Operating segments | Mortgage |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gross premiums written | [3] | 330 |  | 339 | 979 |  | 1,020 |
Premiums ceded | [3] | (56) |  | (57) | (186) |  | (185) |
Net premiums written |  | 274 |  | 282 | 793 |  | 835 |
Change in unearned premiums |  | 27 |  | 31 | 89 |  | 90 |
Net premiums earned |  | 301 |  | 313 | 882 |  | 925 |
Other underwriting income |  | 3 | [4] | 3 | 17 | [4] | 15 |
Losses and loss adjustment expenses |  | 2 |  | 1 | 2 |  | 37 |
Acquisition expenses |  | (2) |  | 1 | (7) |  | 1 |
Other operating expenses | [5] | (44) |  | (49) | (144) |  | (151) |
Underwriting income (loss) |  | $ 260 |  | $ 269 | $ 750 |  | $ 827 |
Underwriting Ratios |  |  |  |  |  |  |  |
Loss ratio |  | (0.50%) |  | (0.40%) | (0.20%) |  | (4.00%) |
Acquisition expense ratio |  | 0.70% |  | (0.40%) | 0.80% |  | (0.10%) |
Other operating expense ratio | [2] | 13.30% |  |  | 14.30% |  |  |
Other operating expense ratio |  |  |  | 15.60% |  |  | 16.30% |
Combined ratio |  | 13.50% |  | 14.80% | 14.90% |  | 12.20% |
Goodwill and intangible assets |  | $ 335 |  | $ 348 | $ 335 |  | $ 348 |
[1] | Certain expenses have been excluded from ‘Corporate expenses’ and reflected in ‘Transaction costs and other.’
[2] | The ‘Other operating expense ratio’ for the 2025 period includes ‘Other underwriting income.’
[3] | Certain assumed and ceded amounts related to intersegment transactions are included in individual segment results. Accordingly, the sum of such transactions for each segment does not agree to the total due to eliminations.
[4] | ‘Other underwriting income’ includes revenue earned from underwriting-related activities covered under existing service contracts.
[5] | ‘Other operating expenses’ primarily include expenses that are related to compensation and employee benefits, information technology and professional fees.

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