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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Number of Reportable Segments |  |  |  |  |  |  |  |  | 2 |  |
Net premiums earned | $ 18,931 | $ 27,441 | $ 27,054 | $ 25,579 | $ 24,945 | $ 12,187 | $ 7,785 | $ 6,995 | $ 99,005 | $ 51,911 | $ 13,869
Commission income | 38,009 | 23,064 | 13,221 | 17,729 | 12,191 | 14,572 | 10,032 | 14,486 | 92,023 | 51,281 | 30,695
Program fees | 3,989 | 3,622 | 3,328 | 2,567 | 2,461 | 2,415 | 2,076 | 1,485 | 13,506 | 8,437 | 3,095
Revenues from external customers |  |  |  |  |  |  |  |  | 92,023 | 51,281 | 30,695
Net investment income, net investment gains (losses), including impairments |  |  |  |  |  |  |  |  | 13,951 | 13,176 | 4,442
Net gains (losses) on derivative contracts | (2,043) | 6,545 | (438) | (48) | 69 | (27) | (146) | (175) | 4,016 | (279) | 935
Other income (expense) |  |  |  |  |  |  |  |  | 13,314 | 200 | 576
Total revenues and other income |  |  |  |  |  |  |  |  | 235,815 | 124,728 | 53,612
Loss and loss adjustment expenses (benefit) | 9,826 | 20,421 | 23,024 | 19,355 | 16,805 | 9,509 | 5,739 | 4,659 | 72,626 | 36,712 | 9,071
Policy acquisition costs | 7,850 | 5,993 | 5,399 | 4,424 | 5,851 | 1,956 | 1,351 | 1,399 | 23,666 | 10,557 | 2,535
Commission expenses | 13,667 | 9,499 | 7,888 | 9,822 | 7,392 | 8,455 | 6,021 | 7,597 | 40,876 | 29,465 | 17,641
Depreciation expense |  |  |  |  |  |  |  |  | 2,345 | 1,078 | 872
Amortization of intangible assets | 8,901 | 6,423 | 1,139 | 1,139 | 1,139 | 1,079 | 966 | 967 | 17,602 | 4,152 | 2,921
EBITDA | (30,518) |  |  |  | (18,991) |  |  |  | (30,518) | (18,991) | (31,913)
Other Comprehensive Income (losss) Net of Tax Portion Attributable to Noncontrolling Interest EBITDA Adjusted |  |  |  |  |  |  |  |  | (6,448) | (2,102) | (1,463)
AMBAC EBITDA | (36,966) |  |  |  | (21,093) |  |  |  | (36,966) | (21,093) | (33,377)
Interest expense |  |  |  |  |  |  |  |  | 9,379 | 0 | 0
Compensation expense |  |  |  |  |  |  |  |  | 64,346 | 48,468 | 39,159
Non Compensation expense |  |  |  |  |  |  |  |  | 64,820 | 18,517 | 17,119
Total expenses |  |  |  |  |  |  |  |  | 295,660 | 148,949 | 89,318
Pretax income (loss) from continuing operations |  |  |  |  |  |  |  |  | (59,845) | (24,221) | (35,706)
Segment income tax expense (benefit) |  |  |  |  |  |  |  |  | (924) | (989) | (462)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total | (20,943) | (19,890) | (14,719) | (3,369) | (9,099) | (4,595) | (8,725) | (813) | (58,921) | (23,232) | (35,244)
Noncontrolling interest |  |  |  |  |  |  |  |  | (361) | (1,319) | (871)
Segment net income (loss) attributable to Ambac shareholders |  |  |  |  |  |  |  |  | (59,282) | (24,551) | (36,115)
Discontinued operations | (526,102) | $ (9,387) | $ 14,182 | $ 24,140 | 7,169 | $ 66,190 | $ (9,300) | $ (35,876) | (497,167) | 28,183 | 557,364
Net income (loss) attributable to Ambac shareholders |  |  |  |  |  |  |  |  | (556,449) | 3,632 | 522,380
Assets | 8,058,378 |  |  |  | 8,428,320 |  |  |  | 8,058,378 | 8,428,320 | 7,972,730
Disposal Group, Including Discontinued Operation, Assets | 6,267,200 |  |  |  | 7,516,456 |  |  |  | 6,267,200 | 7,516,456 | 7,291,949
Corporate Expenses Changed to Discontinued Operations |  |  |  |  |  |  |  |  | 14,919 | 19,367 | 20,189
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Total revenues and other income |  |  |  |  |  |  |  |  | 212,605 | 124,728 | 53,612
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |
Total revenues and other income |  |  |  |  |  |  |  |  | 23,210 | 0 | 0
Specialty Property & Casualty Program |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 99,005 | 51,911 | 13,869
Program fees |  |  |  |  |  |  |  |  | 13,506 | 8,437 | 3,095
Net investment income, net investment gains (losses), including impairments |  |  |  |  |  |  |  |  | 6,400 | 3,759 | 1,559
Net gains (losses) on derivative contracts |  |  |  |  |  |  |  |  | 0 | 0 |
Other income (expense) |  |  |  |  |  |  |  |  | 7,409 | (6) | (58)
Total revenues and other income |  |  |  |  |  |  |  |  | 126,320 | 64,101 | 18,465
Loss and loss adjustment expenses (benefit) |  |  |  |  |  |  |  |  | 72,626 | 36,712 | 9,071
Policy acquisition costs |  |  |  |  |  |  |  |  | 23,666 | 10,557 | 2,535
Depreciation expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
EBITDA | 12,222 |  |  |  | 383 |  |  |  | 12,222 | 383 | (6,346)
AMBAC EBITDA | 12,222 |  |  |  | 383 |  |  |  | 12,222 | 383 | (6,347)
Interest expense |  |  |  |  |  |  |  |  |  |  | 0
Compensation expense |  |  |  |  |  |  |  |  | 10,201 | 10,853 | 7,799
Non Compensation expense |  |  |  |  |  |  |  |  | 7,605 | 5,596 | 5,406
Total expenses |  |  |  |  |  |  |  |  | 114,098 | 63,718 | 24,811
Pretax income (loss) from continuing operations |  |  |  |  |  |  |  |  | 12,222 | 383 | (6,346)
Segment income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,753 | 48 | (1)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  | 10,469 | 335 | (6,345)
Noncontrolling interest |  |  |  |  |  |  |  |  | 2 | (1) | 15
Segment net income (loss) attributable to Ambac shareholders |  |  |  |  |  |  |  |  | 10,471 | 334 | (6,330)
Assets | 751,272 |  |  |  | 523,179 |  |  |  | 751,272 | 523,179 | 316,327
Insurance Distribution |  |  |  |  |  |  |  |  |  |  |
Commission income |  |  |  |  |  |  |  |  | 92,023 | 51,281 | 30,695
Net investment income, net investment gains (losses), including impairments |  |  |  |  |  |  |  |  | 787 | 64 | 0
Net gains (losses) on derivative contracts |  |  |  |  |  |  |  |  | 106 | 0 |
Other income (expense) |  |  |  |  |  |  |  |  | 6,320 | 200 | 715
Total revenues and other income |  |  |  |  |  |  |  |  | 99,236 | 51,546 | 31,410
Commission expenses |  |  |  |  |  |  |  |  | 40,876 | 29,465 | 17,641
Depreciation expense |  |  |  |  |  |  |  |  | 481 | 42 | 31
Operating Expenses |  |  |  |  |  |  |  |  |  | 0 |
Amortization of intangible assets |  |  |  |  |  |  |  |  | 17,602 | 4,152 | 2,921
EBITDA | 19,653 |  |  |  | 11,483 |  |  |  | 19,653 | 11,483 | 7,476
Other Comprehensive Income (losss) Net of Tax Portion Attributable to Noncontrolling Interest EBITDA Adjusted |  |  |  |  |  |  |  |  | (6,448) | (2,102) | (1,463)
AMBAC EBITDA | 13,208 |  |  |  |  |  |  |  | 13,208 |  | 6,013
Interest expense |  |  |  |  |  |  |  |  | 9,379 |  | 0
Compensation expense |  |  |  |  |  |  |  |  | 28,353 | 7,951 | 4,518
Non Compensation expense |  |  |  |  |  |  |  |  | 10,354 | 2,647 | 1,775
Total expenses |  |  |  |  |  |  |  |  | 107,045 | 44,257 | 26,886
Pretax income (loss) from continuing operations |  |  |  |  |  |  |  |  | (7,809) | 7,289 | 4,524
Segment income tax expense (benefit) |  |  |  |  |  |  |  |  | (928) | 156 | 0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  | (6,881) | 7,133 | 4,524
Noncontrolling interest |  |  |  |  |  |  |  |  | (363) | (1,318) | (886)
Segment net income (loss) attributable to Ambac shareholders |  |  |  |  |  |  |  |  | (7,244) | 5,815 | 3,638
Assets | 900,222 |  |  |  | 154,846 |  |  |  | 900,222 | 154,846 | 138,068
Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Assets | 1,791,178 |  |  |  | 911,864 |  |  |  | 1,791,178 | 911,864 | 680,781
Corporation |  |  |  |  |  |  |  |  |  |  |
Net investment income, net investment gains (losses), including impairments |  |  |  |  |  |  |  |  |  |  | 2,883
Net gains (losses) on derivative contracts |  |  |  |  |  |  |  |  |  |  | 935
Other income (expense) |  |  |  |  |  |  |  |  |  |  | (81)
Total revenues and other income |  |  |  |  |  |  |  |  |  |  | 3,737
Depreciation expense |  |  |  |  |  |  |  |  |  |  | 841
EBITDA |  |  |  |  |  |  |  |  |  |  | (33,043)
AMBAC EBITDA |  |  |  |  |  |  |  |  |  |  | (33,043)
Compensation expense |  |  |  |  |  |  |  |  |  |  | 26,842
Non Compensation expense |  |  |  |  |  |  |  |  |  |  | 9,938
Total expenses |  |  |  |  |  |  |  |  |  |  | 37,621
Pretax income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  | (33,884)
Segment income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | (462)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  |  |  | (33,422)
Segment net income (loss) attributable to Ambac shareholders |  |  |  |  |  |  |  |  |  |  | (33,422)
Assets |  |  |  |  |  |  |  |  |  |  | $ 226,386
Corporate Segment |  |  |  |  |  |  |  |  |  |  |
Net investment income, net investment gains (losses), including impairments |  |  |  |  |  |  |  |  | 6,764 | 9,353 |
Net gains (losses) on derivative contracts |  |  |  |  |  |  |  |  | 3,910 | (279) |
Other income (expense) |  |  |  |  |  |  |  |  | (415) | 6 |
Total revenues and other income |  |  |  |  |  |  |  |  | 10,259 | 9,080 |
Depreciation expense |  |  |  |  |  |  |  |  | 1,864 | 1,036 |
EBITDA | (62,393) |  |  |  | (30,858) |  |  |  | (62,393) | (30,858) |
AMBAC EBITDA | (62,396) |  |  |  | (30,858) |  |  |  | (62,396) | (30,858) |
Compensation expense |  |  |  |  |  |  |  |  | 25,791 | 29,664 |
Non Compensation expense |  |  |  |  |  |  |  |  | 46,861 | 10,274 |
Total expenses |  |  |  |  |  |  |  |  | 74,516 | 40,974 |
Pretax income (loss) from continuing operations |  |  |  |  |  |  |  |  | (64,257) | (31,894) |
Segment income tax expense (benefit) |  |  |  |  |  |  |  |  | (1,748) | (1,193) |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  | (62,509) | (30,701) |
Segment net income (loss) attributable to Ambac shareholders |  |  |  |  |  |  |  |  | (62,509) | (30,701) |
Assets | $ 139,684 |  |  |  | 233,839 |  |  |  | $ 139,684 | 233,839 |
Income Loss On Variable Interest Entities [Member] |  |  |  |  |  |  |  |  |  |  |
AMBAC EBITDA |  |  |  |  | $ 9,381 |  |  |  |  | $ 9,381 |

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