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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Pay vs Performance Disclosure |  |  |  |  |
Pay vs Performance Disclosure, Table |
| Summary Compensation Table Total for PEO (1) | Compensation Actually Paid to PEO (2) | Average Summary Compensation Table Total for Non-PEO NEOs (1) | Average Compensation Actually Paid to Non-PEO NEOs (2) | Value of Initial Fixed $100 Investment Based On: | Net Income (Loss) (in millions) | Company-Selected Performance Measure - rTSR percentile rank (4)
Year | Total Shareholder Return | Peer Group Total Shareholder Return (3)
2024 | $ | 6,340,720 |  | $ | 1,789,951 |  | $ | 2,041,272 |  | $ | 1,045,001 |  | $ | 59 | $ | 150 | $ | (556) | 10th
2023 | $ | 6,917,719 |  | $ | 7,049,544 |  | $ | 2,200,003 |  | $ | 2,229,021 |  | $ | 76 | $ | 130 | $ | 5 | 39th
2022 | $ | 6,185,762 |  | $ | 9,867,444 |  | $ | 2,058,411 |  | $ | 2,882,417 |  | $ | 81 | $ | 105 | $ | 522 | 45th
2021 | $ | 6,979,315 |  | $ | 8,273,439 |  | $ | 2,190,289 |  | $ | 2,413,753 |  | $ | 75 | $ | 145 | $ | (17) | 7th
2020 | $ | 6,011,501 |  | $ | 2,777,279 |  | $ | 1,989,183 |  | $ | 1,431,419 |  | $ | 71 | $ | 131 | $ | (437) | 20th
Company Selected Measure Name | relative total shareholder return ("rTSR") |  |  |  |
Named Executive Officers, Footnote | The registrant's Principle Executive Officer ("PEO") for the years 2020, 2021, 2022, 2023, and 2024 was Claude LeBlanc. Non-PEO NEOs for the years 2020, 2021, 2022, 2023, and 2024 were Messrs. Trick, Barranco, and Ksenak, and Ms. Smith. |  |  |  |
Peer Group Issuers, Footnote | Peer group total shareholder return represents the performance of the S&P Completion index (SPCMI). |  |  |  |
PEO Total Compensation Amount | $ 6,340,720 | $ 6,917,719 | $ 6,185,762 | $ 6,979,315 | $ 6,011,501
PEO Actually Paid Compensation Amount | $ 1,789,951 | 7,049,544 | 9,867,444 | 8,273,439 | 2,777,279
Adjustment To PEO Compensation, Footnote | Compensation Actually Paid ("CAP") equals the Summary Compensation Table total, adjusted to replace the grant date value of stock unit awards with the sum of: (i) the fair value of all equity grants made during the year valued as of the last day of the year; (ii) the year over year changes in fair value of prior year awards that remain outstanding at the end of the year presented; and (iii) for awards that vested in the year presented, the changes in fair value of from prior year end to the vesting date. There were no equity awards that were granted and vested in the same year during the years presented. There were no dividends paid on unvested stock awards during the years presented. The assumptions used to calculate an award's fair value do not materially differ from the disclosed valuation assumptions used to calculate grant date fair value. The following tables contain a reconciliation of the amounts reported for (i) total compensation in the Summary Compensation Table with the amounts reported for Compensation Actually Paid in each of the years indicated for the PEO, and (ii) an average of the total compensation in the Summary Compensation Table with the amounts reported for the average Compensation Actually Paid to the Non-PEO NEOs, respectively.
| Reconciliation of Summary Compensation Table Total to Compensation Actually Paid for the PEO |
Year | Summary Compensation Table Total | Deduct Grant Date Fair Value of Stock Unit Awards | Add Year-end fair value of stock unit awards granted | Add change in fair value of prior year outstanding awards | Add change in fair value of prior year vested awards | Compensation Actually Paid
2024 | $ | 6,340,720 | $ | (3,788,006) | $ | 2,494,082 | $ | (3,177,612) | $ | (79,233) | $ | 1,789,951
2023 | $ | 6,917,719 | $ | (4,125,142) | $ | 4,396,779 | $ | 461,933 | $ | (601,745) | $ | 7,049,544
2022 | $ | 6,185,762 | $ | (3,420,095) | $ | 4,906,825 | $ | 2,649,464 | $ | (454,512) | $ | 9,867,444
2021 | $ | 6,979,315 | $ | (4,358,942) | $ | 3,779,167 | $ | 1,335,745 | $ | 538,154 | $ | 8,273,439
2020 | $ | 6,011,501 | $ | (3,285,787) | $ | 2,534,939 | $ | (2,206,007) | $ | (277,367) | $ | 2,777,279
| Reconciliation of the Average Summary Compensation Table Total to the Average Compensation Actually Paid to the non-PEO NEOs |
Year | Average Summary Compensation Table Total | Deduct Grant Date Average Fair Value of Stock Unit Awards | Add Year-end average fair value of stock unit awards granted | Add change in average fair value of prior year outstanding awards | Add change in average fair value of prior year vested awards | Average Compensation Actually Paid
2024 | $ | 2,041,272 | $ | (829,407) | $ | 546,093 | $ | (695,746) | $ | (17,211) | $ | 1,045,001
2023 | $ | 2,200,003 | $ | (903,227) | $ | 962,697 | $ | 102,449 | $ | (132,901) | $ | 2,229,021
2022 | $ | 2,058,411 | $ | (748,853) | $ | 1,074,383 | $ | 577,697 | $ | (79,221) | $ | 2,882,417
2021 | $ | 2,190,289 | $ | (947,297) | $ | 821,299 | $ | 281,351 | $ | 68,111 | $ | 2,413,753
2020 | $ | 1,989,183 | $ | (725,939) | $ | 560,051 | $ | (303,616) | $ | (88,260) | $ | 1,431,419
Non-PEO NEO Average Total Compensation Amount | $ 2,041,272 | 2,200,003 | 2,058,411 | 2,190,289 | 1,989,183
Non-PEO NEO Average Compensation Actually Paid Amount | $ 1,045,001 | 2,229,021 | 2,882,417 | 2,413,753 | 1,431,419
Adjustment to Non-PEO NEO Compensation Footnote | Compensation Actually Paid ("CAP") equals the Summary Compensation Table total, adjusted to replace the grant date value of stock unit awards with the sum of: (i) the fair value of all equity grants made during the year valued as of the last day of the year; (ii) the year over year changes in fair value of prior year awards that remain outstanding at the end of the year presented; and (iii) for awards that vested in the year presented, the changes in fair value of from prior year end to the vesting date. There were no equity awards that were granted and vested in the same year during the years presented. There were no dividends paid on unvested stock awards during the years presented. The assumptions used to calculate an award's fair value do not materially differ from the disclosed valuation assumptions used to calculate grant date fair value. The following tables contain a reconciliation of the amounts reported for (i) total compensation in the Summary Compensation Table with the amounts reported for Compensation Actually Paid in each of the years indicated for the PEO, and (ii) an average of the total compensation in the Summary Compensation Table with the amounts reported for the average Compensation Actually Paid to the Non-PEO NEOs, respectively.
| Reconciliation of Summary Compensation Table Total to Compensation Actually Paid for the PEO |
Year | Summary Compensation Table Total | Deduct Grant Date Fair Value of Stock Unit Awards | Add Year-end fair value of stock unit awards granted | Add change in fair value of prior year outstanding awards | Add change in fair value of prior year vested awards | Compensation Actually Paid
2024 | $ | 6,340,720 | $ | (3,788,006) | $ | 2,494,082 | $ | (3,177,612) | $ | (79,233) | $ | 1,789,951
2023 | $ | 6,917,719 | $ | (4,125,142) | $ | 4,396,779 | $ | 461,933 | $ | (601,745) | $ | 7,049,544
2022 | $ | 6,185,762 | $ | (3,420,095) | $ | 4,906,825 | $ | 2,649,464 | $ | (454,512) | $ | 9,867,444
2021 | $ | 6,979,315 | $ | (4,358,942) | $ | 3,779,167 | $ | 1,335,745 | $ | 538,154 | $ | 8,273,439
2020 | $ | 6,011,501 | $ | (3,285,787) | $ | 2,534,939 | $ | (2,206,007) | $ | (277,367) | $ | 2,777,279
| Reconciliation of the Average Summary Compensation Table Total to the Average Compensation Actually Paid to the non-PEO NEOs |
Year | Average Summary Compensation Table Total | Deduct Grant Date Average Fair Value of Stock Unit Awards | Add Year-end average fair value of stock unit awards granted | Add change in average fair value of prior year outstanding awards | Add change in average fair value of prior year vested awards | Average Compensation Actually Paid
2024 | $ | 2,041,272 | $ | (829,407) | $ | 546,093 | $ | (695,746) | $ | (17,211) | $ | 1,045,001
2023 | $ | 2,200,003 | $ | (903,227) | $ | 962,697 | $ | 102,449 | $ | (132,901) | $ | 2,229,021
2022 | $ | 2,058,411 | $ | (748,853) | $ | 1,074,383 | $ | 577,697 | $ | (79,221) | $ | 2,882,417
2021 | $ | 2,190,289 | $ | (947,297) | $ | 821,299 | $ | 281,351 | $ | 68,111 | $ | 2,413,753
2020 | $ | 1,989,183 | $ | (725,939) | $ | 560,051 | $ | (303,616) | $ | (88,260) | $ | 1,431,419
Compensation Actually Paid vs. Total Shareholder Return | The following graph describes the relationship between Compensation Actually Paid ("CAP") to the principal executive officer and the Average Compensation Actually Paid to the Non-PEO NEOs and Ambac's cumulative total shareholder return ("Ambac TSR") over the last five fiscal years. |  |  |  |
Compensation Actually Paid vs. Net Income | The following graph describes the relationship between CAP to our named executive officers and Ambac's Net Income over the last five fiscal years. |  |  |  |
Compensation Actually Paid vs. Company Selected Measure | Ambac has selected rTSR as its CSM. The rTSR measure is the percentile rank of Ambac's TSR as compared to the TSR of all members of the peer group within each LTIP issuance, ranked in descending order (including Ambac). This measure was first approved by Ambac's Compensation Committee for the 2019 LTIP issuance with a three year performance period, therefore, the rTSR reported in the below chart for 2020 represents two outstanding LTIP award issuances while all other years represent three outstanding LTIP award issuances. The following graph shows the relationship of CAP compared with percentile rank rTSR, over the last five fiscal years. |  |  |  |
Total Shareholder Return Vs Peer Group | Ambac's TSR and the S&P Completion index cumulative TSR over the last five fiscal years. The comparison assumes $100 was invested in the Company and in the S&P Completion index for the period starting December 31, 2019 and was held through the end of each fiscal year listed in the first table set forth above. Historical stock performance is not necessarily indicative of future stock performance. |  |  |  |
Tabular List, Table |
l | Reductions in Net Par Outstanding in the insured portfolio | l | Number of underwritten programs at Everspan
l | Reductions in Gross Operating Run Rate Expenses | l | EBITDA margins at Cirrata
l | Earned premium and program fees at Everspan | l | Number of new MGAs and non-program business at Cirrata
l | Reductions in Watch List and Adversely Classified Credits | l | Relative Total Shareholder Return
l | Cumulative Xchange EBITDA |  |
Total Shareholder Return Amount | $ 59 | 76 | 81 | 75 | 71
Peer Group Total Shareholder Return Amount | 150 | 130 | 105 | 145 | 131
Net Income (Loss) | $ (556,000,000) | $ 5,000,000 | $ 522,000,000 | $ (17,000,000) | $ (437,000,000)
Company Selected Measure Amount | 0.10 | 0.39 | 0.45 | 0.07 | 0.20
PEO Name | Claude LeBlanc |  |  |  |
Additional 402(v) Disclosure | This “Pay Versus Performance” section provides information concerning executive pay ("compensation actually paid" as defined by the SEC) and Company performance for each of the fiscal years ending December 31, 2020, 2021, 2022, 2023, and 2024. The Compensation Committee did not consider this pay versus performance disclosure when making compensation decisions. These amounts have been calculated as required by SEC rules and do not reflect the actual amounts of compensation earned or realized by our NEOs. The following table below provides information concerning executive pay and Company performance as required under SEC Regulation S-K Item 402(v). The following table contains a list that shows the most important financial performance measures used by Ambac's Compensation Committee to link compensation actually paid to the named executive officers to Company performance for the most recently completed fiscal year. |  |  |  |
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Reductions in Net Par Outstanding in the insured portfolio |  |  |  |
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Reductions in Gross Operating Run Rate Expenses |  |  |  |
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Earned premium and program fees at Everspan |  |  |  |
Measure:: 4 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Reductions in Watch List and Adversely Classified Credits |  |  |  |
Measure:: 5 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Cumulative Xchange EBITDA |  |  |  |
Measure:: 6 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Number of underwritten programs at Everspan |  |  |  |
Measure:: 7 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | EBITDA margins at Cirrata |  |  |  |
Measure:: 8 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Number of new MGAs and non-program business at Cirrata |  |  |  |
Non-GAAP Measure Description | Ambac selected relative total shareholder return ("rTSR") as the company-selected measure ("CSM") for 2024 as reflected in the table above. rTSR is presented as the percentile rank of Ambac's Total Shareholder Return ("TSR") as compared to the TSR of all members of the peer group. SEC regulations require Ambac to designate a CSM that in its assessment represents the most important financial performance measure (that is not total shareholder return or net income) used by Ambac to link CAP of our NEOs, for the most recently completed fiscal year, to performance. This measure was first approved by Ambac's Compensation Committee for the 2019 LTIP issuance with a three year performance period, therefore, the rTSR reported in the above chart for 2020 represents two outstanding LTIP award issuances while 2021, 2022, 2023 and 2024 represent four outstanding LTIP award issuances, respectively. While rTSR has been selected as Ambac's CSM it is not the most important measure used by the Board in determination of compensation. For the most recent year, reductions in Watch List and Adversely Classified Credits at AAC were given more weight in determining compensation but under SEC regulations this measure does not meet the criteria of a CSM. rTSR may not have been the most important financial performance measure for years 2020, 2021, 2022, 2023, and 2024 and Ambac may determine a different CSM to be the most important financial performance measure in future years. |  |  |  |
Measure:: 9 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Relative Total Shareholder Return |  |  |  |
PEO | Stock Awards Adjustments [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (3,788,006) | $ (4,125,142) | $ (3,420,095) | $ (4,358,942) | $ (3,285,787)
PEO | Equity Awards Reported Value [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 2,494,082 | 4,396,779 | 4,906,825 | 3,779,167 | 2,534,939
PEO | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (3,177,612) | 461,933 | 2,649,464 | 1,335,745 | (2,206,007)
PEO | Equity Awards Granted in Prior Years, Vested [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (79,233) | (601,745) | (454,512) | 538,154 | (277,367)
Non-PEO NEO | Stock Awards Adjustments [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (829,407) | (903,227) | (748,853) | (947,297) | (725,939)
Non-PEO NEO | Equity Awards Reported Value [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 546,093 | 962,697 | 1,074,383 | 821,299 | 560,051
Non-PEO NEO | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (695,746) | 102,449 | 577,697 | 281,351 | (303,616)
Non-PEO NEO | Equity Awards Granted in Prior Years, Vested [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (17,211) | $ (132,901) | $ (79,221) | $ 68,111 | $ (88,260)

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