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.
White Mountains Insurance Group Ltd. filings document the formal disclosures of a Bermuda-incorporated insurance and financial-services holding company with common shares listed on the New York Stock Exchange and the Bermuda Stock Exchange. The record includes 8-K reports on operating results, non-GAAP reconciliations, capital deployment, acquisitions, dispositions and reinsurance arrangements.
Filings also cover proxy governance, annual meeting matters, capital structure and shareholder actions, including share repurchase and tender-offer disclosures. Company-specific exhibits and pro forma materials describe transactions involving White Mountains Partners, Ark/WM Outrigger, Kudu, Distinguished and the completed sale of Bamboo, alongside risk and financial disclosures tied to insurance, reinsurance, investment portfolio performance and capital management.
White Mountains Insurance Group Ltd. executive Wesley C. Bell, the MD & Chief Accounting Officer, reported a stock transaction dated December 23, 2025. He disposed of 60 common shares, coded as a "G" transaction, at a reported price of $0, indicating a gift or similar transfer. Following this activity, he beneficially owns 2,165 common shares directly, plus 1,825 restricted common shares directly and 20 common shares held indirectly through a 401(k) account. An accompanying note explains that the 401(k) position reflects the accumulation of 2 common shares in his company retirement account based on a plan report dated December 22, 2025.
White Mountains Insurance Group Ltd director reported a stock sale of company shares. On 12/19/2025, the reporting person sold 5,000 common shares in a transaction coded "S" (sale) at a price of $2,050 per share. After this sale, the director beneficially owned 10,440 common shares directly. In addition, 119 common shares were held indirectly through a 401(k) plan. The filing is submitted as a Form 4/A amendment for an earlier report dated 12/22/2025 and reflects the director’s updated ownership position.
White Mountains Insurance Group Ltd. reported an insider share transaction by a company director. On 12/19/2025, the reporting person sold 5,000 common shares of the company, coded as a sale transaction. The reported sale price per share is $0. Following this transaction, the director beneficially owns 10,440 common shares directly and an additional 119 shares indirectly through a 401(k) plan. The filing is made by a single reporting person who serves as a director of White Mountains Insurance Group Ltd.
White Mountains Insurance Group's chief executive officer and director reported an insider sale of 5,000 common shares on 12/19/2025 at a price of $2,050 per share. Following this transaction, the insider directly owned 13,809 common shares and 5,425 restricted common shares, plus 122 common shares held indirectly through a 401(k) account. The 401(k) balance reflects the accumulation of 2 additional common shares based on a plan report dated as of December 20, 2025.
White Mountains Insurance Group, Ltd. has filed an amendment to its issuer tender offer for its common shares. The company is offering to repurchase up to $300 million of its outstanding shares for cash at a price not greater than $2,050 nor less than $1,850 per share, subject to the terms in the Offer to Purchase and Letter of Transmittal. The amendment notes that the offer expired at 12:00 midnight, New York City time, on December 19, 2025, and that the company issued a press release on December 22, 2025 announcing preliminary results of the offer, which is included as a new exhibit.
White Mountains Insurance Group Ltd reported that a director disposed of 165 common shares on 12/16/2025, leaving 1,568 shares beneficially owned in direct form.
The transaction is coded "S" in the filing and lists a price of $2,048.51 for the common shares. The report is filed for one reporting person and identifies the filer’s relationship to the company as a director.
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.