STOCK TITAN

[8-K] AMBAC FINANCIAL GROUP INC Reports Material Event

Filing Impact
(Moderate)
Filing Sentiment
(Neutral)
Form Type
8-K

Ambac Financial Group completed the sale of its wholly owned subsidiary Ambac Assurance Corporation to Acorn for $420,000,000 in cash, subject to adjustments, on September 29, 2025. Concurrent with the closing, the company issued a warrant to the investor exercisable for 5,092,707 shares of Ambac common stock. The warrant includes staged conversion windows beginning after the six-month lock-up termination and limits conversion frequency and size, and the company may elect to settle conversions in stock, cash based on a Black-Scholes valuation, or a combination.

The total cash and stock consideration the company may pay upon conversion of the warrant is capped at $70 million in the aggregate. The warrant and related Warrant Shares were issued in reliance on Section 4(a)(2) exemptions. The transaction and investor rights are described as governed by referenced agreements incorporated by exhibit.

Ambac Financial Group ha completato la vendita della sua controllata interamente posseduta Ambac Assurance Corporation ad Acorn per 420.000.000 di dollari in contanti, soggetti a aggiustamenti, il 29 settembre 2025. Contestualmente al closing, la società ha emesso un warrant all'investitore esercitabile per 5.092.707 azioni ordinarie di Ambac. Il warrant prevede finestre di conversione scaglionate a partire dopo la cessazione del periodo di lock-up di sei mesi e limita la frequenza e la dimensione della conversione, e la società può scegliere di pagare le conversioni in azioni, in contanti basati su una valutazione Black-Scholes o in una combinazione.
Il totale della contropartita in contanti e azioni che la società può pagare in caso di conversione del warrant è limitato a 70 milioni di dollari in aggregato. Il warrant e le relative azioni warrant sono stati emessi facendo affidamento sulle esenzioni della Sezione 4(a)(2). La transazione e i diritti degli investitori sono descritti come disciplinati dagli accordi di riferimento incorporati in una mostra.

Ambac Financial Group completó la venta de su controlada totalmente poseída Ambac Assurance Corporation a Acorn por $420,000,000 en efectivo, sujeto a ajustes, el 29 de septiembre de 2025. Concurrentemente con el cierre, la empresa emitió un warrant al inversionista que se puede ejercer por 5,092,707 acciones comunes de Ambac. El warrant incluye ventanas de conversión escalonadas que comienzan después de la terminación del período de bloqueo de seis meses y limita la frecuencia y el tamaño de la conversión, y la empresa puede optar por liquidar las conversiones en acciones, en efectivo basado en una valoración Black-Scholes, o en una combinación.
La compensación total en efectivo y acciones que la empresa puede pagar al convertir el warrant está limitada a 70 millones de dólares en total. El warrant y las acciones asociadas se emitieron basándose en las exenciones de la Sección 4(a)(2). Se describe la transacción y los derechos de los inversionistas como gobernados por los acuerdos de referencia incorporados en el anexo.

앰백 파이낸셜 그룹은 2025년 9월 29일에 $420,000,000의 현금으로 Acorn에 Ambac Assurance Corporation를 완전한 소유의 자회사로 매각하는 거래를 완료했습니다. 조정될 수 있습니다. 거래 종결과 동시에 투자자에게 행사 가능한 Ambac 일반주 5,092,707주에 대한 워런트를 발행했습니다. 이 워런트는 6개월 잠금 해제 후 시작되는 단계적 전환 창을 포함하며 전환 빈도와 규모를 제한하고, 회사는 전환을 주식, 블랙-숄즈 평가에 따른 현금 지급, 또는 이들의 조합으로 결제할 수 있습니다.
워런트 전환 시 현금 및 주식으로 지급될 수 있는 총 보상은 총액 7천만 달러로 한정됩니다. 워런트 및 관련 워런트 주식은 섹션 4(a)(2) 면제를 근거로 발행되었습니다. 거래 및 투자자 권리는 첨부된 exhibit에 포함된 참고 계약에 의해 규율되는 것으로 설명됩니다.

Le groupe Ambac Financial a finalisé la vente de sa filiale entièrement détenue Ambac Assurance Corporation à Acorn pour 420 000 000 dollars en espèces, soumis à ajustements, le 29 septembre 2025. Conjointement à la clôture, la société a émis un warrant à l'investisseur exerçable pour 5 092 707 actions ordinaires Ambac. Le warrant prévoit des fenêtres de conversion échelonnées à partir de la résiliation du lock-up de six mois et limite la fréquence et la taille des conversions, et la société peut choisir d’effectuer les conversions soit en actions, soit en espèces sur la base d’une valorisation Black-Scholes, soit en une combinaison des deux.
Le total des contreparties en espèces et en actions que la société peut payer lors de la conversion du warrant est plafonné à 70 millions de dollars au total. Le warrant et les actions associées ont été émis en s’appuyant sur les exemptions de la Section 4(a)(2). La transaction et les droits des investisseurs sont décrits comme étant régis par les accords de référence incorporés en annexe.

Ambac Financial Group hat den Verkauf seiner vollständig im Eigentum befindlichen Tochtergesellschaft Ambac Assurance Corporation an Acorn für 420.000.000 US-Dollar in bar, vorbehaltlich Anpassungen, am 29. September 2025 abgeschlossen. Gleichzeitig mit dem Abschluss hat das Unternehmen dem Investor eine Option (Warrant) zum Erwerb von 5.092.707 Aktien der Ambac-Stammaktien ausgestellt. Der Warrant umfasst gestaffelte Konversionsfenster, die nach Ablauf der sechsmonatigen Lock-up-Periode beginnen, und beschränkt Häufigkeit und Größe der Konversion; das Unternehmen kann entscheiden, Konversionen in Aktien, in Cash basierend auf einer Black‑Scholes-Bewertung oder in einer Mischung zu begleichen.
Die gesamte Cash- und Aktienvergütung, die das Unternehmen bei einer Konversion des Warrants zahlen kann, ist insgesamt auf 70 Millionen US-Dollar begrenzt. Der Warrant und die damit verbundenen Warrant Shares wurden unter Berufung auf Ausnahmen der Section 4(a)(2) ausgegeben. Die Transaktion und die Rechte der Investoren werden als von den in der Beilage genannten Referenzvereinbarungen geregelt beschrieben.

أكملت مجموعة أمباك المالية بيع فرعها التابع بالكامل Ambac Assurance Corporation إلى Acorn بمبلغ 420,000,000 دولار نقداً، مع مراعاة التعديلات، في 29 سبتمبر 2025. وبالتزامن مع الإغلاق، أصدرت الشركة منحة حق لمستثمر يمكن ممارسته لـ 5,092,707 أسهم من أسهم أمباك العادية. يتضمن هذا الحق فترات تحويل متدرجة تبدأ بعد إنهاء قفل الستة أشهر وتحد من تكرار وحجم التحويل، وتملك الشركة الخيار في تسوية التحويلات سواء بالأسهم، أو نقداً بناءً على تقييم بلاك-شولز، أو مزيج منهما.
المقابل الإجمالي بالعملة النقدية والأسهم الذي يمكن للشركة دفعه عند تحويل المنحة مقيد بمبلغ 70 مليون دولار كإجمالي. تم إصدار المنحة والأسهم المرتبطة بها وفق استثناءات القسم 4(a)(2). وتُوصف الصفقة وحقوق المستثمرين بأنها محكومة بالاتفاقيات المشار إليها المدرجة كملاحق.

Ambac Financial Group 于 2025 年 9 月 29 日完成对其全资子公司 Ambac Assurance Corporation 的出售,出售对象为 Acorn,现金交易金额为 4.2 亿美元,需经调整。 收盘同时,公司向投资者发行了一份认股权证,可认购 Ambac 普通股共 5,092,707 股。该认股权证包含自六个月锁定期结束后开始的分阶段转换窗口,限制转换的频率和规模,公司可选择以股票、基于 Black-Scholes 估值的现金,或两者的组合来清算转换。
在认股权证转换时,公司可支付的现金及股票总对价上限为 7000 万美元(总额上限)。认股权证及相关的认股股权在第四条(2)条款豁免下发行。交易及投资者权利被描述为受嵌入展览所附的参考协议所规制。

Positive
  • $420,000,000 cash proceeds from the sale of Ambac Assurance Corporation provide significant near-term liquidity
  • Contingent obligation capped at $70 million limits the maximum aggregate economic exposure from the warrant
  • Staged conversion mechanics and company option to settle in cash reduce immediate dilution risk
Negative
  • Issuance of a warrant for 5,092,707 shares creates potential future dilution if settled in stock
  • Investor rights include standstill and registration provisions that may constrain company or shareholder actions
  • Cash proceeds are subject to adjustments, so final consideration may differ from the stated $420,000,000

Insights

TL;DR: Ambac monetized a regulated insurance subsidiary for substantial cash proceeds while retaining a capped contingent equity/liability via a warrant.

The $420 million cash sale of Ambac Assurance Corporation is a material liquidity event that reduces Ambac's regulatory insurance exposure and provides near-term capital flexibility. The issuance of a warrant for 5,092,707 shares creates a contingent dilution and potential cash settlement obligation, but the $70 million aggregate cap limits ultimate economic outlay from conversions. Staged conversion mechanics and Black-Scholes cash settlement option mitigate immediate dilution risk but extend contingent obligations into the coming years. Overall, the structure is consistent with monetization plus deferred investor upside while containing downside to a defined cap.

TL;DR: Sale proceeds meaningfully boost cash resources; the warrant creates a capped future obligation and trading/liquidity considerations for shareholders.

The $420 million purchase price provides a clear, quantifiable inflow, subject to adjustments, which improves near-term balance sheet liquidity. The Warrant for 5,092,707 shares introduces future dilution risk if exercised for shares, or a cash expense if settled under Black-Scholes valuation, but the $70 million ceiling limits maximum impact. Issuance under Section 4(a)(2) indicates a private placement to the investor with associated investor rights, including limited registration and standstill provisions, which may affect secondary market dynamics for the stock. Impact is material but contains mitigating contractual caps and timing controls.

Ambac Financial Group ha completato la vendita della sua controllata interamente posseduta Ambac Assurance Corporation ad Acorn per 420.000.000 di dollari in contanti, soggetti a aggiustamenti, il 29 settembre 2025. Contestualmente al closing, la società ha emesso un warrant all'investitore esercitabile per 5.092.707 azioni ordinarie di Ambac. Il warrant prevede finestre di conversione scaglionate a partire dopo la cessazione del periodo di lock-up di sei mesi e limita la frequenza e la dimensione della conversione, e la società può scegliere di pagare le conversioni in azioni, in contanti basati su una valutazione Black-Scholes o in una combinazione.
Il totale della contropartita in contanti e azioni che la società può pagare in caso di conversione del warrant è limitato a 70 milioni di dollari in aggregato. Il warrant e le relative azioni warrant sono stati emessi facendo affidamento sulle esenzioni della Sezione 4(a)(2). La transazione e i diritti degli investitori sono descritti come disciplinati dagli accordi di riferimento incorporati in una mostra.

Ambac Financial Group completó la venta de su controlada totalmente poseída Ambac Assurance Corporation a Acorn por $420,000,000 en efectivo, sujeto a ajustes, el 29 de septiembre de 2025. Concurrentemente con el cierre, la empresa emitió un warrant al inversionista que se puede ejercer por 5,092,707 acciones comunes de Ambac. El warrant incluye ventanas de conversión escalonadas que comienzan después de la terminación del período de bloqueo de seis meses y limita la frecuencia y el tamaño de la conversión, y la empresa puede optar por liquidar las conversiones en acciones, en efectivo basado en una valoración Black-Scholes, o en una combinación.
La compensación total en efectivo y acciones que la empresa puede pagar al convertir el warrant está limitada a 70 millones de dólares en total. El warrant y las acciones asociadas se emitieron basándose en las exenciones de la Sección 4(a)(2). Se describe la transacción y los derechos de los inversionistas como gobernados por los acuerdos de referencia incorporados en el anexo.

앰백 파이낸셜 그룹은 2025년 9월 29일에 $420,000,000의 현금으로 Acorn에 Ambac Assurance Corporation를 완전한 소유의 자회사로 매각하는 거래를 완료했습니다. 조정될 수 있습니다. 거래 종결과 동시에 투자자에게 행사 가능한 Ambac 일반주 5,092,707주에 대한 워런트를 발행했습니다. 이 워런트는 6개월 잠금 해제 후 시작되는 단계적 전환 창을 포함하며 전환 빈도와 규모를 제한하고, 회사는 전환을 주식, 블랙-숄즈 평가에 따른 현금 지급, 또는 이들의 조합으로 결제할 수 있습니다.
워런트 전환 시 현금 및 주식으로 지급될 수 있는 총 보상은 총액 7천만 달러로 한정됩니다. 워런트 및 관련 워런트 주식은 섹션 4(a)(2) 면제를 근거로 발행되었습니다. 거래 및 투자자 권리는 첨부된 exhibit에 포함된 참고 계약에 의해 규율되는 것으로 설명됩니다.

Le groupe Ambac Financial a finalisé la vente de sa filiale entièrement détenue Ambac Assurance Corporation à Acorn pour 420 000 000 dollars en espèces, soumis à ajustements, le 29 septembre 2025. Conjointement à la clôture, la société a émis un warrant à l'investisseur exerçable pour 5 092 707 actions ordinaires Ambac. Le warrant prévoit des fenêtres de conversion échelonnées à partir de la résiliation du lock-up de six mois et limite la fréquence et la taille des conversions, et la société peut choisir d’effectuer les conversions soit en actions, soit en espèces sur la base d’une valorisation Black-Scholes, soit en une combinaison des deux.
Le total des contreparties en espèces et en actions que la société peut payer lors de la conversion du warrant est plafonné à 70 millions de dollars au total. Le warrant et les actions associées ont été émis en s’appuyant sur les exemptions de la Section 4(a)(2). La transaction et les droits des investisseurs sont décrits comme étant régis par les accords de référence incorporés en annexe.

Ambac Financial Group hat den Verkauf seiner vollständig im Eigentum befindlichen Tochtergesellschaft Ambac Assurance Corporation an Acorn für 420.000.000 US-Dollar in bar, vorbehaltlich Anpassungen, am 29. September 2025 abgeschlossen. Gleichzeitig mit dem Abschluss hat das Unternehmen dem Investor eine Option (Warrant) zum Erwerb von 5.092.707 Aktien der Ambac-Stammaktien ausgestellt. Der Warrant umfasst gestaffelte Konversionsfenster, die nach Ablauf der sechsmonatigen Lock-up-Periode beginnen, und beschränkt Häufigkeit und Größe der Konversion; das Unternehmen kann entscheiden, Konversionen in Aktien, in Cash basierend auf einer Black‑Scholes-Bewertung oder in einer Mischung zu begleichen.
Die gesamte Cash- und Aktienvergütung, die das Unternehmen bei einer Konversion des Warrants zahlen kann, ist insgesamt auf 70 Millionen US-Dollar begrenzt. Der Warrant und die damit verbundenen Warrant Shares wurden unter Berufung auf Ausnahmen der Section 4(a)(2) ausgegeben. Die Transaktion und die Rechte der Investoren werden als von den in der Beilage genannten Referenzvereinbarungen geregelt beschrieben.

0000874501FALSE00008745012025-09-292025-09-29

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
Date of Report (Date of earliest event reported): September 29, 2025
Ambac Financial Group, Inc.
(Exact name of Registrant as specified in its charter)

Delaware1-1077713-3621676
(State of incorporation)(Commission
file number)
(I.R.S. employer
identification no.)
One World Trade CenterNew YorkNY10007
(Address of principal executive offices)
(212)
658-7470
(Registrant's telephone number, including area code)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the Registrant under any of the following provisions:
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act
(17 CFR 240.14d-2(b))
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act
(17 CFR 240.13e-4c))
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading SymbolName of each exchange on which registered
Common stock, par value $0.01 per shareAMBCNew York Stock Exchange
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 under the Securities Act (17 CFR 230.405) or Rule 12b-2 under the Exchange Act (17 CFR 240.12b-2).
Emerging growth company
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to
Section 13(a) of the Exchange Act.



Item 1.01. Entry into a Material Definitive Agreement
Investor Rights Agreement
On September 29, 2025, in connection with the completion of the AAC Transaction (as defined below), Ambac Financial Group, Inc., a Delaware corporation (the “Company”) and American Acorn Holdings, LLC, a Delaware limited liability company owned by funds managed by Oaktree Capital Management, L.P. (the “Investor”) entered into an Investor Rights Agreement (the “Investor Rights Agreement”). Certain terms of the Investor Rights Agreement were amended by the Letter Agreement, dated as of July 3, 2025 (the "Letter Agreement"), by and between the Company and American Acorn Corporation, a Delaware corporation ("Acorn").
The Investor Rights Agreement provides for, among other things, (i) the grant of limited shelf registration rights related to the Warrant Shares (as defined below), unless the Investor owns less than 25% of the Warrants (as defined below) and the Warrant Shares or after a Fall-Away Event (as defined in the Investor Rights Agreement), the Warrant Shares are eligible to be sold by the Investor pursuant to Rule 144 under the Securities Act of 1933, as amended (the “Securities Act”) without any limitations as to volume or manner of sale and piggyback registration rights, (ii) a standstill restriction on the Investor that prohibits certain actions by the Investor without the prior written approval of the Company and (iii) confidentiality and indemnification obligations.
The description of the Investor Rights Agreement in this report is qualified in its entirety by reference to the full text of the Investor Rights Agreement, which is attached as Exhibit 10.1 to this Current Report on Form 8-K, and the Letter Agreement, which was filed as Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on July 7, 2025, each of which is incorporated by reference herein.
Warrant
On September 29, 2025, in connection with the consummation of the AAC Transaction, the Company issued to Investor a warrant (the “Warrant”) exercisable for 5,092,707 shares of common stock, par value $0.01, per share of the Company (the “Warrant Shares”). Certain terms of the Warrant were amended by the Letter Agreement.
Following the close of business on the six-month anniversary of the closing of the AAC Transaction (the “Lock-Up Termination Date”) and until 5:00 p.m., Eastern Time, on March 29, 2032, the Investor may, once in the first six-month period following the Lock-Up Termination Date and then, once in any three-month period following the end of such six-month period, convert up to the lesser of (a) the amount of the unexercised and unconverted Warrant and (b) one-third of the original amount of the Warrant. The Warrant may be converted, at the Company’s option, for (i) the number of Warrant Shares for which the Investor has elected to convert or (ii) a cash payment, in each case based on the Black-Scholes Value (as defined in the Letter Agreement) of the number of Warrant Shares for which the Investor has elected to convert, or (iii) a combination of Warrant Shares and cash. The sum of all amounts paid by the Company (whether in the form of Warrant Shares or cash) to Investor or its affiliates with respect to the Warrant upon conversion of the Warrant (including conversions in connection with a Change of Control (as defined in the Letter Agreement)) will not exceed $70 million in the aggregate. The Warrant was, and the Warrant Shares will be, issued in reliance upon an exemption from registration pursuant to Section 4(a)(2) of the Securities Act.
The description of the Warrant in this report is qualified in its entirety by reference to the full text of the Warrant Agreement, which is attached as Exhibit 4.1 to this Current Report on Form 8-K, and the Letter Agreement, each of which is incorporated by reference herein.
Item 2.01. Completion of Acquisition or Disposition of Assets.
On September 29, 2025, the Company completed its previously announced sale to Acorn of all of the issued and outstanding shares of common stock, par value $2.50 per share, of Ambac Assurance Corporation, a Wisconsin stock insurance company and wholly owned subsidiary of the Company (the “AAC Transaction”), for $420,000,000 in cash, subject to certain adjustments, pursuant to and upon the terms and subject to the conditions set forth in, the stock purchase agreement, dated as of June 3, 2024, as amended by the First Amendment, dated as of July 3, 2025 (together, the “AAC Sale Agreement”), by and between the Company and Acorn.
The description of the AAC Sale Agreement in this report is qualified in its entirety by reference to the full text of the AAC Sale Agreement, which was filed as Exhibit 2.1 to the Company’s Current Report on Form 8-K/A on June 5, 2024, and the First Amendment to the AAC Sale Agreement, which was filed as Exhibit 2.1 to the Company’s Current Report on Form 8-K on July 7, 2025, each of which is incorporated by reference herein.
Item 3.02. Unregistered Sales of Equity Securities.
1


The information contained in Item 1.01 relating to the issuance of the Warrant is incorporated by reference into this Item 3.02.
Item 7.01. Regulation FD Disclosure.
On September 29, 2025, the Company issued a press release to announce the closing of the AAC Transaction, a copy of which is attached as Exhibit 99.1 hereto and is incorporated by reference herein.
The information furnished pursuant to this Item 7.01, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act or the Exchange Act.

Item 9.01. Financial Statements and Exhibits
(d) Exhibits. The following exhibits are filed as part of this Current Report on Form 8-K
EXHIBIT INDEX
Incorporated by Reference
Exhibit
Number
Exhibit DescriptionFormFiling
Date
Exhibit
Number
Filed
Herewith
2.1
Stock Purchase Agreement, by and between Ambac Financial Group, Inc. and American Acorn Corporation, dated as of June 4, 2024.
8-K/A6/5/20242.1
2.2
First Amendment to the Stock Purchase Agreement, by and between Ambac Financial Group, Inc. and American Acorn Corporation, dated as of July 3, 2025
8-K7/7/20252.1
4.1
Warrant Agreement, by and between Ambac Financial Group, Inc. and American Acorn Holdings, LLC, dated as of September 29, 2025.
X
10.1
Investor Rights Agreement, by and between Ambac Financial Group, Inc. and American Acorn Holdings, LLC, dated as of September 29, 2025.
X
10.2
Letter Agreement, by and between Ambac Financial Group, Inc. and American Acorn Corporation, dated as of July 3, 2025.
8-K7/7/202510.1
99.1
Press Release dated September 29, 2025.
X
101.INS
XBRL Instance Document - the instance document does not appear in the interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH
XBRL Taxonomy Extension Schema Document.
101.CAL
XBRL Taxonomy Extension Calculation Linkbase Document.
101.LAB
XBRL Taxonomy Extension Label Linkbase Document.
101.PRE
XBRL Taxonomy Extension Presentation Linkbase Document.
101.DEF
XBRL Taxonomy Extension Definition Linkbase Document.
104
Cover Page Interactive Data File - The cover page interactive data file does not appear in the Interactive Data File because its XBRL tags or embedded within the Inline XBRL document

2


SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Ambac Financial Group, Inc.
(Registrant)
Dated:September 29, 2025By:
/s/ William J. White
William J. White
First Vice President, Secretary and
Assistant General Counsel
3

FAQ

What did AMBC sell and for how much?

Ambac sold all issued and outstanding shares of Ambac Assurance Corporation for $420,000,000 in cash, subject to certain adjustments.

How many shares are covered by the warrant issued to the investor?

The company issued a warrant exercisable for 5,092,707 shares of common stock.

Is there a limit on the company’s payout related to the warrant?

Yes, the aggregate amount the company may pay upon conversion of the warrant is capped at $70 million.

How and when can the warrant be converted?

Following the six-month anniversary of the closing, conversions are allowed in staged windows: once in the first six-month period after the lock-up termination, then once every three months thereafter, up to specified amounts.

Can the company settle warrant conversions in cash?

Yes, the company may elect to settle conversions in Warrant Shares, cash based on a Black-Scholes value, or a combination.

Were the warrant and shares registered for public sale?

No, the warrant and Warrant Shares were issued in reliance on an exemption from registration under Section 4(a)(2) of the Securities Act.
Ambac Finl Group Inc

NYSE:AMBC

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451.02M
42.07M
6.59%
81.01%
5.49%
Insurance - Specialty
Surety Insurance
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United States
NEW YORK