White Mountains: Bamboo Sale Boosts BVPS $320, $1B Capital, $190M Buybacks

Bamboo sale drives capital surge at White Mountains

White Mountains Insurance Group reports book value per share of $2,188 as of Dec. 31, 2025, marking an 18% increase in the fourth quarter and 25% for the full year including dividends. The company attributes the gain chiefly to an $816 million net gain from the sale of Bamboo, which adds roughly $320 to BVPS in 2025, alongside solid operating results and investment returns. Comprehensive income attributable to common shareholders is $837 million in the quarter and $1,109 million for the year, versus $(131) million and $230 million in the comparable 2024 periods.

Management is framing the Bamboo transaction as a transformative capital event that materially strengthens balance-sheet flexibility. White Mountains says the proceeds, coupled with robust underlying earnings, enable a range of capital-deployment options: the company repurchases roughly $190 million of its shares during the quarter (including a self-tender) and reports undeployed capital of about $1.0 billion, which includes a January distribution from WM Outrigger Re. Executives emphasize that the combination of realized gains and recurring earnings positions the group to pursue strategic investments, share repurchases or reinvestment in its operating businesses.

The company highlights that the BVPS increase is not solely transaction-driven, noting contributions from underwriting and investment performance across its subsidiaries. Net operating results and portfolio appreciation supplement the Bamboo proceeds, and management signals continued focus on disciplined capital allocation to support growth across insurance platforms while preserving financial strength.

Underwriting and operating performance

Ark delivers an 83% combined ratio for the year and $2.6 billion of gross written premiums, up 16%, while HG Global posts $61 million of gross written premiums driven by a record year at BAM. Kudu produces a 13% return on equity and grows the fair value of its participation-contract portfolio by 8% on a same‑store basis. Distinguished records $145 million of managed premiums in the quarter across scaled and growth programs.

Tax and investment notes

White Mountains recognizes a $73 million net deferred tax expense in Q4 tied to reversal of a Bermuda economic transition asset ($51 million at Ark, $22 million at HG Global) and says that, following Luxembourg’s Pillar II legislation, it no longer expects to utilize that adjustment. Excluding MediaAlpha, the investment portfolio returns 2.0% in the quarter and 8.9% for the year; MediaAlpha unrealized gains contribute $28 million in the quarter and $30 million for the year.