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Net Income Per Share (Tables)
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share
The following table provides a reconciliation of the weighted average shares denominator used for basic net income per share to the denominator used for diluted net income per share:
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Basic WASO denominator48,106,069 47,688,986 47,862,071 46,580,518 
Effect of potential dilutive shares :
Restricted stock units— — — — 
Performance stock units (1)
— — — — 
Diluted WASO denominator 48,106,069 47,688,986 47,862,071 46,580,518 
Anti-dilutive shares excluded from the above reconciliation:
Warrants
— — — — 
Restricted stock units
170,982 470,482 183,058 480,944 
Performance stock units (1)
— 515,035 — 515,238 
(1)    Performance stock units are reflected based on the performance metrics through the balance sheet date. Vesting of these units is contingent upon meeting certain performance metrics. Although a portion of these performance metrics have been achieved as of the respective period end, it is possible that awards may no longer meet the metric at the end of the performance period.
Schedule of Earnings Per Share, Basic and Diluted
The following table provides a reconciliation of net income attributable to common stockholders to the numerator in the basic and diluted earnings per share calculation, together with the resulting earnings per share amounts:
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Net income (loss) attributable to common stockholders$(112,620)$(27,503)$(231,710)(8,183)
Adjustment of NCI to fair value— — (10,276)— 
Adjustment to redemption value (ASC 480)(569)(2,402)(2,717)(2,533)
Numerator of basic and diluted EPS$(113,189)$(29,905)$(244,703)(10,716)
Per Share:
Basic$(2.35)$(0.63)$(5.11)$(0.23)
Diluted$(2.35)$(0.63)$(5.11)$(0.23)
Schedule of Repurchased Shares
The following table shows shares repurchased by year.
($ in thousands,
except per share)
Year Ended December 31,
YTD
2025
202220232024
Shares repurchased1,605,316325,068937,141292,191
Total cost$14,217 $4,510 $11,678 $3,301 
Average purchase price per share$8.86 $13.88 $12.46 $11.30 
Unused authorization amount$8,449 
Subsequent to September 30, 2025, Ambac repurchased 3,142,554 common shares in the open market at an average price of $8.46 (including brokerage commissions) under a 10b5-1 program. As of the date of this filing $8,449 of unused capacity remains under Ambac's current share repurchase authorization.