20-F: Aspen Reports Strong Underwriting Amid Sompo Merger, Control Weakness

Aspen Insurance Holdings Limited reported increased underwriting income and improved combined ratio for 2025, while disclosing a material weakness in internal controls and the completion of its acquisition by Sompo Holdings, Inc.

Summary

• Gross written premiums increased by 1.4% to $4,673.2 million in 2025, driven by new business growth and existing cross-class program partnerships.
• Overall underwriting income was $370.8 million (combined ratio of 86.9%) for 2025, an improvement from $345.8 million (combined ratio of 87.9%) in 2024.
• Catastrophe losses decreased to $151.5 million (5.3 combined ratio points) in 2025, down from $187.3 million (6.5 combined ratio points) in 2024.
• Net favorable prior year loss reserve development of $127.3 million (4.5 combined ratio points) was recognized for accident years 2020 onwards in 2025.
• Adjusted underwriting income, which excludes the impact of the Loss Portfolio Transfer (LPT), was $390.5 million (adjusted combined ratio of 86.2%) for 2025.
• The capital markets business contributed $194.4 million in fee income in 2025, an increase of $25.4 million from $169.0 million in 2024.
• Third-party capital managed by Aspen Capital Markets grew to $2,724.5 million at December 31, 2025, from $2,207.4 million at December 31, 2024.
• Operating return on average equity decreased to 15.9% for 2025, compared with 19.4% in 2024.
• Total shareholders equity increased by 7.5% to $3,625.1 million as at December 31, 2025.
• The company redeemed $275.0 million of its 5.950% Fixed-to-Floating Perpetual Non-Cumulative Preference Shares on January 1, 2025.
• Aspen issued $300.0 million aggregate principal amount of 5.750% Senior Notes due 2030 on June 13, 2025, using the net proceeds to repay a $300.0 million 2026 Term Loan.
• A material weakness was identified in the design and operating effectiveness of internal controls within the Claims function as of December 31, 2025.
• The acquisition of Aspen by a wholly-owned indirect subsidiary of Sompo Holdings, Inc. was completed on February 24, 2026, resulting in the delisting and deregistration of Aspen's ordinary shares from the NYSE.

Sentiment

Score: 6

Explanation: StockSavvy.ai views this as a moderately positive filing. Strong underwriting performance and capital growth are offset by a decline in net income, a material weakness in internal controls, and ongoing litigation. The Sompo acquisition provides stability but also introduces new regulatory complexities.

Positives

• Gross written premiums increased by 1.4% to $4,673.2 million in 2025, driven by new business growth and existing cross-class program partnerships.
• Overall underwriting income increased to $370.8 million in 2025 from $345.8 million in 2024, demonstrating improved core business performance.
• The combined ratio improved to 86.9% in 2025 from 87.9% in 2024, indicating enhanced underwriting profitability.
• Net favorable prior year loss reserve development of $127.3 million for accident years 2020 onwards contributed positively to 2025 results.
• Capital markets business fee income increased by $25.4 million to $194.4 million in 2025, reflecting successful leveraging of underwriting expertise.
• Third-party capital grew significantly to $2,724.5 million at year-end 2025, up from $2,207.4 million in 2024, indicating strong investor confidence in Aspen's alternative reinsurance platforms.
• Total shareholders equity increased by 7.5% to $3,625.1 million at December 31, 2025, strengthening the company's balance sheet.
• Successful issuance of $300.0 million Senior Notes due 2030 to repay existing debt, optimizing the capital structure.
• S&P upgraded the financial strength and issuer credit ratings of Aspen Bermuda, AAIC, and Aspen UK to A from Afollowing the Sompo acquisition, with a positive outlook, enhancing competitive position.
• A.M. Best maintained 'under review with positive implications' status for the Financial Strength Rating of A (Excellent) for key operating subsidiaries, signaling potential further rating improvements.

Negatives

• Operating return on average equity decreased to 15.9% in 2025 from 19.4% in 2024, indicating a reduction in overall profitability efficiency.
• Net income decreased significantly to $340.2 million in 2025 from $486.1 million in 2024, primarily due to non-operating expenses and foreign exchange losses.
• Net earned premiums decreased by 2.0% in 2025 compared to 2024, partially due to increased ceded earned premiums.
• The general and administrative expense ratio increased from 14.0% in 2024 to 17.4% in 2025, driven by higher compensation, depreciation, and professional/consulting fees.
• Net realized and unrealized foreign exchange losses of $78.5 million were incurred in 2025, a significant reversal from gains of $60.2 million in 2024.
• A material weakness was identified in the design and operating effectiveness of internal controls over financial reporting within the Claims function as of December 31, 2025.
• Cavello Bay Reinsurance Limited initiated litigation claiming breaches of the Loss Portfolio Transfer Reinsurance Agreement, with potential claims exceeding $300.0 million.
• The Brazilian anti-trust regulator CADE's formal investigation concluded with a recommendation to find Aspen UK's conduct anti-competitive in the aviation insurance segment.

Risks

• The occurrence of catastrophes, including weather-related natural disasters, severe weather events, outbreaks of pandemic or contagious diseases, war, terrorism, political unrest, cyber attacks, and government action, could lead to unanticipated losses.
• Global climate change may increase the frequency and severity of severe weather events, wildfires, and flooding, potentially increasing loss costs and disrupting business continuity.
• The effects of emerging claim trends and social inflation, including aggressive litigation strategies and rising settlement values, are uncertain and may adversely affect loss experience and reserving practices.
• Economic inflation may cause premiums to be inadequate and increase claims costs beyond the levels assumed in reserves, requiring reserve strengthening.
• Cyclical changes in the reinsurance and insurance industries, characterized by periods of price competition and excess underwriting capacity, could reduce growth and profitability.
• Reinsurers may not reimburse claims on a timely basis, or at all, or may raise allegations regarding specific contractual provisions, which could materially and adversely affect the company's financial condition.
• The reinsurance purchased and capital market transactions entered into may not always be available on favorable terms, or the company may choose to retain a higher proportion of particular risks.
• A material proportion of the business relies on the assessment and pricing of individual risks by third parties, exposing the company to risks if these parties exceed authority or fail to comply with obligations.
• The failure of any risk management and loss limitation methods employed could have a material adverse effect on financial condition and operating results.
• Actual claims exceeding loss reserves could materially adversely affect financial condition and operating results, as establishing reserves is an inherently uncertain process.
• Increases in the frequency and severity of cyber attacks on policyholders, including 'silent cyber' risks, could adversely affect financial condition and operating results.
• Investments are subject to interest rate, credit, and real estate related risks, which may adversely affect net income and capital adequacy, including illiquidity and potential losses from forced sales.
• Adverse developments affecting the financial services industry, such as liquidity issues or defaults by financial institutions, could impact the company's liquidity and investments.
• The determination of allowances and impairments on investments is highly subjective and could materially impact operating results or financial position.
• Currency fluctuations may adversely affect financial condition and operating results if not effectively mitigated.
• The failure of policyholders, brokers, or other intermediaries or reinsurers to honor their payment obligations could adversely affect operating results.
• Competition and consolidation in the (re)insurance industry could reduce growth and profitability due to increased competition, lower premium rates, and less favorable policy terms.
• A decline in financial strength ratings could adversely affect standing among brokers and customers, decrease premiums and earnings, and trigger contractual provisions.
• Increasing scrutiny and evolving expectations from investors, customers, regulators, and policymakers regarding environmental, social, and governance (ESG) matters may adversely affect reputation or business.
• Future acquisitions, growth into new lines of business or geographic regions, and joint ventures may expose the company to integration risks and potential losses.
• Dependence on a few brokers for a large portion of insurance and reinsurance revenues means the loss of business from any one of these brokers could adversely affect the company.
• Risks associated with the management of alternative reinsurance platforms (ACM) on behalf of investors, including legal duties, regulatory compliance, and potential investor redemptions.
• The company may require additional capital in the future, which may not be available or may only be available on unfavorable terms, especially after significant insured losses.
• Debt, credit, and International Swaps and Derivatives Association (ISDA) agreements may limit financial and operational flexibility, potentially leading to default or restricted access to credit.
• Political, regulatory, governmental, and industry initiatives, as well as changes in laws and regulations (e.g., climate change, AI, U.S. mortgage insurance), may increase compliance costs or restrict business activities.
• The United Kingdom's withdrawal from the European Union (Brexit) has had, and may continue to have, an adverse impact on business, results of operations, and financial condition.
• Changes in Bermuda law and regulations, and the political environment in Bermuda, could adversely affect operations, including the imposition of corporate income tax liability.
• As a result of the acquisition by Sompo, the company may become subject to Japanese regulations, increasing compliance costs and potential liability.
• Changes in current accounting practices and future pronouncements may materially impact reported financial results, potentially requiring considerable additional expenses or restatements.
• Internal controls over financial reporting have gaps or other deficiencies, including a material weakness in the Claims function, which could lead to undetected misstatements.
• Management turnover or the inability to attract and retain senior staff, particularly following the Merger, creates uncertainties and could harm the business.
• The business may be adversely affected if third-party outsourced service providers fail to satisfactorily perform certain technology and business process functions.
• Exposure to general employee and third-party litigation risks, including commercial disputes, employee claims, and regulatory investigations, could harm business and reputation.
• Loss of foreign private issuer status would require compliance with the Exchange Act's domestic reporting regime, incurring significant legal, accounting, and other expenses.
• A failure in data security and/or technology systems or infrastructure, or those of third parties, could disrupt business, damage reputation, and cause losses.
• Damage to computer infrastructure and software systems, and issues relating to the incorporation of artificial intelligence (AI) solutions, could harm the business.
• Compliance with ever-evolving national, federal, state, and international laws relating to the handling of information collected from individuals involves significant expenditure and resources, and any failure to comply may result in significant liability.
• Reliance on analytical models to assist decision-making in key areas carries the risk that actual results could differ materially from model outputs and related analyses.
• The controlling shareholder (Sompo) owns all ordinary shares and has the power to determine company affairs, potentially in ways not favorable to preference shareholders.
• The holding company structure and certain Companies Act, regulatory, and other constraints may limit the ability to pay dividends on securities.
• U.S. persons who own the company's securities may have more difficulty in protecting their interests than U.S. persons who are shareholders of a U.S. corporation.
• The company's bye-laws contain an exclusive jurisdiction provision that may discourage lawsuits against the company and its directors and officers.
• The company's structure involves complex provisions of tax law for which no clear precedent or authority may be available, and is subject to ongoing future potential legislative, judicial, or administrative changes and differing interpretations.
• Non-U.S. companies may be subject to U.S. taxes (e.g., CFC, RPII, PFIC rules), which may have a material adverse effect on operating results and investment.
• Non-U.K. companies may be subject to U.K. tax (e.g., transfer pricing adjustments, Diverted Profits Tax, Unassessed Transfer Pricing Profits), which may have a material adverse effect on operating results.
• The OECD's initiative to limit harmful tax competition (BEPS, BEPS 2.0) may result in higher taxation and increased complexity, burden, and cost of compliance.
• Changes to Bermuda tax policies, including the Corporate Income Tax Act 2023, may impact the company's financial position.

Future Outlook

Aspen expects market conditions to remain attractive, providing opportunities for profitable growth through its multi-platform capabilities and disciplined risk selection. The company anticipates a sustained higher interest rate environment to further boost investment income. However, rate pressure in property and specialty reinsurance is expected to persist through the 2026 renewal cycle due to increased competition. The company will continue to assess the impact of new AI and cyber developments in the EU and UK on its business and is preparing for potential new regulatory requirements, such as the Solvent Exit Analysis in the UK.

Management Comments

• Our objective is to create a diversified portfolio of insurance and reinsurance risks, spread across lines of business, products, geographic areas of coverage, cedants and sources. The acceptance of appropriately priced risk is the core of our business.
• We view underwriting quality and risk management as critical to our success.
• We believe the market currently remains attractive; however, there is softening occurring primarily in short tail lines of business due to benign catastrophe activity. Our business may be significantly and adversely affected if these conditions do not persist.
• Management considers the current cash and cash equivalents, together with dividends declared or expected to be declared by subsidiary companies and our credit facilities, sufficient to appropriately satisfy planned and expected liquidity requirements of Aspen Holdings during 2026 and in light of liquidity projections for the period thereafter.
• Management believes that the reserve for losses and loss adjustment expenses is sufficient to cover expected claims incurred before the reporting date on the basis of the methodologies and judgments used to support its estimates.
• We actively manage our insurance and reinsurance portfolios across market cycles and identify the most attractive risk versus return opportunities to allocate capital.
• Our ability to offer our broker and client partners holistic and customized solutions across our entire platform of Insurance and Reinsurance, and third-party capital offerings through ACM, provides us the opportunity to execute larger, more complex deals which frequently result in more attractive terms and conditions.
• Maintaining underwriting discipline, portfolio balance and strong trading relationships across a diversified portfolio remains critical as market conditions normalize.
• We still believe the business is adequately priced, but would expect rate pressure to persist through the rest of 2026 renewal cycle.

Industry Context

StockSavvy.ai notes that the global (re)insurance market continues to present significant opportunities for companies like Aspen, driven by demand for complex solutions due to increased frequency and severity of natural catastrophes, inflation, and geopolitical tensions. The market is experiencing moderate price increases overall, though softening is observed in short-tail lines due to benign catastrophe activity and increased competition. The trend of higher interest rates is also providing a tailwind for investment income across the industry, benefiting companies with well-managed investment portfolios.

Comparison to Industry Standards

• The combined ratio of 86.9% (86.2% adjusted) for 2025 indicates strong underwriting profitability, generally outperforming many industry peers who might struggle to maintain sub-90% combined ratios in competitive markets.
• The operating return on average equity of 15.9% in 2025, while a decrease from 2024, remains a solid return in the financial services sector, though some top-tier peers might achieve higher returns.
• The S&P rating upgrade to A and A.M. Best's 'under review with positive implications' status for key operating subsidiaries position Aspen favorably against competitors, as strong ratings are crucial for market confidence and business acquisition.
• The growth in third-party capital to $2,724.5 million highlights Aspen's success in leveraging alternative reinsurance markets, a growing trend in the industry to optimize capital and risk management.

Management Changes

Corporate Governance

Legal Proceedings

• Cavello Bay Reinsurance Limited commenced proceedings against the Company in the State of Connecticut Superior Court on August 22, 2025, subsequently refiled in the Supreme Court of the State of New York on October 17, 2025.
• Cavello Bay claims the Company breached the Loss Portfolio Transfer Reinsurance Agreement by refusing to comply with contractual obligations related to collected premiums (over $150.0 million plus prejudgment interest), claims with loss dates after January 1, 2020 under straddle contracts (over $50.0 million in paid claims and reserves), and proper application of loss dates to construction defect claims (exceeding $100.0 million).
• The Company intends to vigorously defend against these claims and bring certain counterclaims.
• The Brazilian anti-trust regulator CADE's formal investigation into alleged anti-competitive practices in the aviation insurance segment concluded in February 2026 with a recommendation to find Aspen UK's conduct anti-competitive; the matter is now referred to the CADE Tribunal for formal decision.

Related Party Transactions

• The Management Consulting Agreement with Apollo Management Holdings, L.P. was terminated with effect from May 9, 2025, following the IPO. Fees recognized in 2025 were $1.8 million (2024: $5.0 million).
• Investment management fees paid to Apollo Asset Management Europe PC LLP (now AAME) were $6.4 million in 2025 (2024: $9.2 million). These IMAs remained in place post-Merger.
• Investments in other investments managed by Apollo had a fair value of $81.4 million at December 31, 2025, generating $2.1 million in income in 2025.
• Investments in notes issued by special purpose vehicles established and managed by Apollo had a fair value of $Nil at December 31, 2025 (sold in Q4 2025), generating $3.4 million in income in 2025.
• Investments in Collateralized Loan Obligations (CLOs) issued by special purpose vehicles established and managed by Apollo had a fair value of $88.8 million at December 31, 2025, generating $8.3 million in income in 2025.
• Investments in Middle Market Loans originated and managed by Apollo had a fair value of $4.8 million at December 31, 2025, resulting in losses of $1.9 million in 2025.
• The Company and its subsidiaries provided insurance and reinsurance coverage to Apollo or certain of its affiliates, with net earned premium of $5.9 million and losses and loss adjustment expenses of $3.7 million in 2025.

Stakeholder Impact

• Ordinary shareholders received US$37.50 per share in cash as a result of the Sompo merger, providing liquidity and a definitive exit price, but their shares were delisted from the NYSE.
• Preference shareholders retain their listed preference shares, which were converted into preference shares of the Surviving Company with the same rights and dividend entitlements, offering continued stability.
• Employees experienced changes to their long-term incentive schemes, with MEP stock options replaced by cash-based or restricted cash awards upon the merger, subject to vesting conditions. Management turnover is a potential risk following the merger.
• Customers and policyholders benefit from the company's strong financial strength ratings (S&P upgraded to A, A.M. Best 'under review with positive implications'), which enhances confidence in Aspen's ability to meet its obligations.
• Regulators will now oversee Aspen as an indirect subsidiary of a Japanese insurance company, potentially introducing new compliance requirements and scrutiny. The company is actively addressing a material weakness in internal controls and ongoing legal/regulatory matters.
• Creditors benefit from the company's strong financial ratings and proactive management of debt obligations, including the issuance of new senior notes to refinance existing debt.

Next Steps

• Continue to implement changes to improve internal controls over financial reporting and remediate the identified material weakness in the Claims function.
• Engage with local and onshore counsel through the dispute resolution process regarding the Cavello Bay litigation and the Brazilian anti-trust investigation.
• Monitor and assess the scope, impact, and risk of new AI and cyber developments in the EU and UK on the business.
• Prepare for potential Solvent Exit Analysis (SEA) requirements from the PRA starting June 30, 2026.
• Monitor further consultations and publications from the FCA regarding consumer duty in 2026.
• Monitor the expected publication of the final rule for Cyber Incident Reporting for Critical Infrastructure Act Reporting Requirements in May 2026.
• The Board declared a $300.0 million dividend on ordinary shares and $11.0 million on preference shares, payable as soon as reasonably practicable after March 4, 2026.

Key Dates

Recommendation

Aspen's strong underwriting performance and improved combined ratio in 2025 are positive indicators of its core business health. The acquisition by Sompo provides significant financial backing and stability, reflected in the S&P rating upgrade. However, the identified material weakness in internal controls over financial reporting, ongoing litigation with Cavello Bay, and the anti-competitive finding in Brazil introduce notable uncertainties and potential liabilities. For preference shareholders, the continued listing and dividend payments offer stability, but the delisting of ordinary shares removes public market liquidity for that class. The overall picture is mixed, suggesting a 'hold' for existing preference shareholders, while new investors should carefully weigh the benefits of strong operational performance and parental backing against the operational and legal risks.

Keywords

Specialty Insurance, Reinsurance, Underwriting, Sompo Acquisition, SEC Filing, Financial Performance, Combined Ratio, Catastrophe Losses, Loss Reserves, Capital Markets, Risk Management, Corporate Governance, Regulatory Compliance, ESG, Cybersecurity, AI, Taxation, Dividends, NYSE Delisting, Bermuda, Financial Services