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INVESTMENTS (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Fair Value of Fixed Maturity Investments Trading and Equity Investments | The following table summarizes the fair value of fixed maturity investments trading:
|  | At September 30, 2025 |  | At December 31, 2024 |
| U.S. treasuries | $ | 10,423,051 |  |  | $ | 11,001,893 |  |
| Corporate (1) | 8,127,496 |  |  | 7,862,423 |  |
| Residential mortgage-backed | 2,249,921 |  |  | 1,707,056 |  |
| Asset-backed | 1,456,067 |  |  | 1,422,393 |  |
| Non-U.S. government | 692,295 |  |  | 618,809 |  |
| Agencies | 521,942 |  |  | 623,489 |  |
| Commercial mortgage-backed | 301,450 |  |  | 326,451 |  |
| Total fixed maturity investments trading | $ | 23,772,222 |  |  | $ | 23,562,514 |  |
(1)Corporate fixed maturity investments include non-U.S. government-backed corporate fixed maturity investments. The following table summarizes the fair value of equity investments:
|  | At September 30, 2025 |  | At December 31, 2024 |
| Fixed income exchange traded funds | $ | 1,329,544 |  |  | $ | — |  |
| Financials | 134,177 |  |  | 116,400 |  |
| Industrial, utilities and energy | 1,402 |  |  | 312 |  |
| Basic materials | 437 |  |  | 595 |  |
| Consumer | 124 |  |  | 154 |  |
| Healthcare | 99 |  |  | 32 |  |
| Communications and technology | 50 |  |  | 263 |  |
| Total | $ | 1,465,833 |  |  | $ | 117,756 |  |
Schedule of Contractual Maturities of Fixed Maturity Investments | Contractual maturities of fixed maturity investments trading are described in the following table. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | At September 30, 2025 |  | At December 31, 2024 |
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |
| Due in less than one year | $ | 1,459,627 |  |  | $ | 1,462,105 |  |  | $ | 1,374,089 |  |  | $ | 1,373,838 |  |
| Due after one through five years | 12,585,181 |  |  | 12,742,119 |  |  | 12,139,153 |  |  | 12,131,114 |  |
| Due after five through ten years | 5,135,454 |  |  | 5,216,558 |  |  | 6,339,563 |  |  | 6,246,506 |  |
| Due after ten years | 362,812 |  |  | 344,002 |  |  | 387,413 |  |  | 355,156 |  |
| Mortgage-backed | 2,559,465 |  |  | 2,551,371 |  |  | 2,094,190 |  |  | 2,033,507 |  |
| Asset-backed | 1,452,317 |  |  | 1,456,067 |  |  | 1,416,132 |  |  | 1,422,393 |  |
| Total | $ | 23,554,856 |  |  | $ | 23,772,222 |  |  | $ | 23,750,540 |  |  | $ | 23,562,514 |  |
Schedule of Components of Net Investment Income | The components of net investment income are as follows:
|  | Three months ended |  | Nine months ended |
|  | September 30, 2025 |  | September 30, 2024 |  | September 30, 2025 |  | September 30, 2024 |
| Fixed maturity investments trading | $ | 287,139 |  |  | $ | 289,687 |  |  | $ | 854,035 |  |  | $ | 820,876 |  |
| Short term investments | 51,855 |  |  | 46,746 |  |  | 141,299 |  |  | 141,923 |  |
| Equity investments |  |  |  |  |  |  |  |
| Fixed income exchange traded funds | 15,876 |  |  | — |  |  | 23,588 |  |  | — |  |
| Other equity investments | 610 |  |  | 670 |  |  | 1,951 |  |  | 1,819 |  |
| Other investments |  |  |  |  |  |  |  |
| Catastrophe bonds | 50,503 |  |  | 61,175 |  |  | 153,205 |  |  | 177,860 |  |
| Other | 27,036 |  |  | 20,937 |  |  | 67,451 |  |  | 59,525 |  |
| Cash and cash equivalents | 12,045 |  |  | 10,226 |  |  | 35,488 |  |  | 40,347 |  |
|  | 445,064 |  |  | 429,441 |  |  | 1,277,017 |  |  | 1,242,350 |  |
| Investment expenses | (6,710) |  |  | (5,582) |  |  | (20,202) |  |  | (16,871) |  |
| Net investment income | $ | 438,354 |  |  | $ | 423,859 |  |  | $ | 1,256,815 |  |  | $ | 1,225,479 |  |
Schedule of Net Realized and Unrealized Gains (Losses) on Investments | Net realized and unrealized gains (losses) on investments are as follows:
|  | Three months ended |  | Nine months ended |
|  | September 30, 2025 |  | September 30, 2024 |  | September 30, 2025 |  | September 30, 2024 |
| Gross realized gains on fixed maturity investments trading | $ | 31,036 |  |  | $ | 41,538 |  |  | $ | 83,919 |  |  | $ | 128,544 |  |
| Gross realized losses on fixed maturity investments trading | (11,743) |  |  | (19,486) |  |  | (56,358) |  |  | (162,509) |  |
| Net realized gains (losses) on fixed maturity investments trading | 19,293 |  |  | 22,052 |  |  | 27,561 |  |  | (33,965) |  |
| Net unrealized gains (losses) on fixed maturity investments trading | 66,796 |  |  | 590,309 |  |  | 389,382 |  |  | 353,465 |  |
| Net realized and unrealized gains (losses) on fixed maturity investments trading | 86,089 |  |  | 612,361 |  |  | 416,943 |  |  | 319,500 |  |
| Net realized and unrealized gains (losses) on investment-related derivatives (1) | 181,012 |  |  | 97,534 |  |  | 498,089 |  |  | 50,102 |  |
| Net realized gains (losses) on equity investments | 541 |  |  | 340 |  |  | 613 |  |  | 355 |  |
| Net unrealized gains (losses) on equity investments | 6,609 |  |  | 18,778 |  |  | 33,366 |  |  | 26,368 |  |
| Net realized and unrealized gains (losses) on equity investments | 7,150 |  |  | 19,118 |  |  | 33,979 |  |  | 26,723 |  |
| Net realized and unrealized gains (losses) on other investments - catastrophe bonds | 44,592 |  |  | 66,291 |  |  | (9,837) |  |  | 51,091 |  |
| Net realized and unrealized gains (losses) on other investments - other | (6,953) |  |  | 148,441 |  |  | 55,376 |  |  | 155,091 |  |
| Net realized and unrealized gains (losses) on investments | $ | 311,890 |  |  | $ | 943,745 |  |  | $ | 994,550 |  |  | $ | 602,507 |  |
(1)Net realized and unrealized gains (losses) on investment-related derivatives includes fixed maturity investments related derivatives, equity investments related derivatives and commodity related derivatives. See “Note 13. Derivative Instruments” for additional information.

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