Welcome to our dedicated page for White Mountains SEC filings (Ticker: WTM), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
The White Mountains Insurance Group, Ltd. (WTM) SEC filings page on Stock Titan provides direct access to the company’s U.S. regulatory disclosures, including Forms 10‑K, 10‑Q and 8‑K. As a Bermuda‑domiciled financial services holding company with common shares listed on the New York Stock Exchange and the Bermuda Stock Exchange, White Mountains files detailed reports describing its property and casualty insurance and reinsurance activities, municipal bond reinsurance operations, capital solutions for asset and wealth management firms, insurance distribution platforms and other investments.
In its annual reports on Form 10‑K and quarterly reports on Form 10‑Q, White Mountains presents consolidated financial statements, segment information for businesses such as Ark/WM Outrigger, HG Global, Kudu, Bamboo, Distinguished and Other Operations, and discussions of book value per share, comprehensive income and risk factors. These filings also describe exposures to catastrophic events, reserve adequacy considerations, investment portfolio performance and the impact of holdings such as MediaAlpha.
Current reports on Form 8‑K capture material events affecting WTM. Recent examples include the renewal of Outrigger Re Ltd., a collateralized reinsurance sidecar providing quota share protection on a portion of Ark Bermuda’s global property catastrophe portfolio; the entry into and closing of transactions to acquire a controlling interest in Distinguished Programs; the sale of a controlling financial interest in the Bamboo Group to affiliates of funds advised by CVC Capital Partners while retaining an indirect equity interest; announcements of quarterly results and non‑GAAP segment metrics; and disclosures regarding executive leadership changes.
On Stock Titan, these filings are updated as they are posted to EDGAR and are accompanied by AI‑powered summaries that highlight key points, such as segment performance, transaction terms, capital deployment, and changes in book value per share. Users can quickly scan 10‑K and 10‑Q reports for segment‑level trends, review 8‑K filings for acquisitions, dispositions, tender offers and governance changes, and examine how White Mountains describes risks related to catastrophes, reinsurance capacity, rating agency actions and regulatory developments. The platform also surfaces insider‑related disclosures contained in periodic and current reports, helping investors understand how management and the board respond to evolving conditions in the insurance and financial services markets.
White Mountains Insurance Group completed a major divestiture of its Bamboo business. On December 5, 2025, a wholly owned subsidiary sold approximately 77.3% of its equity interest in WM Pierce Holdings, Inc. and its subsidiaries, including Bamboo Ide8 Insurance Services, LLC, to affiliates of funds advised by CVC Capital Partners under a securities purchase agreement dated October 2, 2025.
The transaction generated net cash proceeds at closing of $848 million, while White Mountains retained an indirect equity interest in the Bamboo Group valued at $250 million. The company also prepared and filed unaudited pro forma condensed consolidated financial statements to show how this sale would have affected its balance sheet as of September 30, 2025 and its results of operations for the nine months ended September 30, 2025 and the year ended December 31, 2024.
White Mountains Insurance Group Ltd. (WTM) director reported a small change in personal holdings. On 11/25/2025, the reporting person disposed of 50 common shares at a stated price of $0 under transaction code "G," which typically indicates a gift. Following this transaction, the reporting person beneficially owns 15,440 common shares directly and 119 common shares indirectly through a 401(k) plan. The filing covers only non-derivative equity and shows no derivative securities activity.
White Mountains Insurance Group Ltd filed a Form 13F disclosing institutional holdings with a reported Form 13F Information Table Value Total of $203,208,267.
The report lists 1 information table entry and is signed by Michaela J. Hildreth, Managing Director and Chief Accounting Officer, on 11-13-2025.
White Mountains Insurance Group (WTM) director reported a bona fide gift of 4 common shares on November 10, 2025 at $0 (Code G). Following the transaction, the director beneficially owns 2,104 shares, held directly, per Form 4.
Morgan Stanley filed an amended Schedule 13G reporting beneficial ownership in White Mountains Insurance Group Ltd. (WTM). The filing discloses 132,638 shares beneficially owned, representing 5.2% of the common stock as of the event date 09/30/2025.
The filing lists 0 shares with sole voting power and 95,280 shares with shared voting power. It also reports 0 shares with sole dispositive power and 132,638 shares with shared dispositive power. Morgan Stanley certifies the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control of the issuer.
White Mountains Insurance Group, Ltd. reported net income attributable to common shareholders of $113.8 million for the quarter and $270.6 million for the first nine months of 2025, down from $179.0 million and $360.8 million a year earlier. Total revenues rose to $864.2 million for the quarter and $2.13 billion year-to-date, reflecting strong contributions from P&C insurance, asset management and distribution businesses.
The company agreed to sell a controlling interest in Bamboo at a $1.75 billion enterprise value, expecting about $840 million in net cash and retaining a $250 million stake. It also acquired controlling interests in Distinguished, a specialty insurance distribution platform, and Enterprise Solutions, expanding non-insurance operations. Investment portfolios remained sizable, with $7.06 billion in total investments and growing Level 3 holdings tied mainly to Kudu participation contracts.
White Mountains Insurance Group (WTM) furnished a press release with results for the three and nine months ended September 30, 2025. The update emphasizes several non‑GAAP measures across Kudu, Bamboo, and Distinguished, with reconciliations provided in the accompanying exhibit.
Bamboo’s MGA pre-tax income was $14.9 million for Q3 2025 and $40.1 million for the nine-month period, after removing the Bamboo captive from consolidated GAAP. Total consolidated portfolio return was 2.1% for Q3; excluding MediaAlpha it was 2.0%. For the nine months, total consolidated portfolio return was 6.6%; excluding MediaAlpha it was 6.8%. The Q3 total equity portfolio return was 2.8% and 2.7% excluding MediaAlpha.
The release details how Kudu’s EBITDA and adjusted metrics exclude fair‑value changes, equity‑based comp, and transaction costs; Bamboo’s MGA metrics exclude captive results and specified expenses; and Distinguished’s ScaleCo figures exclude GrowthCo results and certain non‑cash items. Reconciliations are included in Exhibit 99.1.
White Mountains Insurance Group Ltd. (WTM) filed an Form 8-K reporting a material event that references a Securities Purchase Agreement dated October 2, 2025 among White Mountains Investments (Luxembourg) S.à r.l., WM Pierce Holdings, Inc., PM Holdings, LLC and other parties. The filing also includes a press release dated October 3, 2025. The 8-K identifies a significant transaction document and a public announcement but does not include transaction economics, consideration amounts, or detailed terms within the excerpt provided.
White Mountains Insurance Group, Ltd. has completed a significant acquisition in the specialty insurance program space. On September 2, 2025, the company and two indirect wholly owned subsidiaries closed the previously announced purchase of 50% of AQ Phoenix Parent, L.P., known as Distinguished Programs, for $224 million in cash.
Including an existing interest of approximately 1%, White Mountains now holds a 51% controlling stake in Distinguished Programs. This gives White Mountains majority control over the business, meaning it can direct key decisions and will typically consolidate Distinguished Programs’ financial results in its own reporting.
White Mountains Insurance Group announced a planned CEO succession: Manning Rountree will retire as CEO and director on December 31, 2025, and will become Senior Advisor through January 1, 2028. Liam Caffrey, currently President and CFO, will become CEO and a director on January 1, 2026. Michael Papamichael will succeed Caffrey as CFO and Giles Harrison will become President, both effective January 1, 2026. The filing states there are no arrangements, family relationships, or material transactions requiring disclosure for the new officers, and no material changes to their compensation at this time. The Board approved a letter agreement with Mr. Rountree providing a 2025 cash bonus formula and a $300,000 annual salary during his advisory term, plus restrictive covenants and a mutual release of claims.