Highest-materiality recent filing
Steven M. Yi did not stand for re-election; term ended May 21, 2026.
White Mountains' HG Global unit issues $200M 7.39% senior notes due 2036
Net proceeds will repay $150M existing term loan (9.93% floating), pay fees, and fund a dividend to White Mountains.
White Mountains Q1 book value per share down 1% to $2,170; comprehensive loss $27M
Book value per share $2,170, down 0.8% in quarter; comprehensive loss $(27)M vs $35M income a year ago.
White Mountains acquires majority stake in BaseSix for ~$97M
White Mountains Partners completed acquisition of majority interest in BaseSix Systems for ~$97 million equity investment.
White Mountains invests $125M in Bishop Street MGA platform
White Mountains completed a $125M structured capital investment into Bishop Street Underwriters.
White Mountains Q4 BVPS +18%, full-year +25%; Bamboo sale adds ~$320
Book value per share $2,188 at Dec 31, 2025, up 18% QoQ and 25% YoY including dividends.
Ark Insurance renews Outrigger sidecar with $70M third-party capital for 2026
Outrigger Re Ltd. renewed for 2026 on similar terms as 2025; deployed $70M total investor capital from third-party investors.
White Mountains completes sale of controlling Bamboo stake to CVC for $848M net cash
Sold 77.3% equity interest in Bamboo Group for $848M net cash proceeds at closing on Dec 5, 2025.
White Mountains Q3 BVPS $1,851 (+3%); sells 77% of Bamboo to CVC for ~$325/share boost
Book value per share $1,851, up 3% in Q3 and 6% YTD including dividends; pro-forma BVPS $2,176 after Bamboo sale.
White Mountains sells ~77% of Bamboo to CVC at $1.75B enterprise value
White Mountains will sell ~77% equity interest in Bamboo to CVC, retaining ~15% fully-diluted stake.
White Mountains closes $224M acquisition of 50% of Distinguished Programs, now holds 51% control
Closed acquisition of 50% of AQ Phoenix Parent, L.P. (Distinguished Programs) for $224M in cash on Sept. 2, 2025.
White Mountains CEO Manning Rountree to retire Dec 31, 2025; Liam Caffrey to succeed
Manning Rountree to retire as CEO and board member on Dec 31, 2025; becomes Senior Advisor through Jan 1, 2028.
White Mountains Q2 BVPS +3% to $1,804; Ark combined ratio 84%, Bamboo record quarter
BVPS $1,804 (+3% for Q2 and H1); comprehensive income $124M vs -$55M prior year.
White Mountains closes $150M strategic investment in BroadStreet Partners
White Mountains invested $150M in BroadStreet as part of a group led by Ethos Capital, BCI, and T. Rowe Price.
White Mountains enters $250M senior unsecured revolver, undrawn at close
Established $250M senior unsecured revolving credit facility, fully undrawn as of July 16, 2025.
White Mountains acquires 51% controlling interest in Distinguished Programs for $230M
Acquisition includes existing ~1% interest; total cash consideration ~$230M for 51% controlling stake.
White Mountains files investor presentation for annual meeting; no specifics in exhibit text
White Mountains held its Annual Investor Information Meeting on June 6, 2025.
White Mountains shareholders approve all proposals at 2025 AGM, elect directors
Elected Class I directors Reid T. Campbell, Peter M. Carlson, Suzanne F. Shank to terms ending 2028.
Comprehensive income $35M vs $236M prior year; MediaAlpha unrealized loss $37M vs gain $211M.
White Mountains invests $150M alongside Ethos Capital and BCI in BroadStreet Partners
White Mountains to invest $150M as co-lead investor with Ethos Capital and BCI for ownership stake in BroadStreet.
White Mountains Q4 ABVPS down 3% on $122M MediaAlpha loss; full-year ABVPS up 8%
Adjusted book value per share $1,834 at Dec 31, 2024, down 3% QoQ; full-year gain 8% including dividends.
White Mountains renews Outrigger Re sidecar with $230M total capital for 2025
Outrigger Re renewed on similar terms as 2024; quota share with Ark on global property catastrophe portfolio starting Jan 1, 2025.
White Mountains Q3 ABVPS up 6% to $1,883; Ark combined ratio improves to 79%
Adjusted book value per share of $1,883, up 6% in Q3 and 11% YTD including dividends.
White Mountains Q2 ABVPS down 1% on MediaAlpha loss; operating units post solid growth
ABVPS down 1% to $1,777; comprehensive loss $55M vs $21M profit a year ago.
White Mountains holds annual investor meeting; presentation filed without specific new disclosures
White Mountains held its 2024 Annual Investor Information Meeting on June 7, 2024.
White Mountains holds 2024 AGM; all director nominees and proposals approved
2,565,733 common shares outstanding and eligible to vote as of April 1, 2024 record date.
Mr. Steven M. Yi did not stand for re-election in 2026 as a director of White Mountains Insurance Group, Ltd. (the “Company”) and completed his tenure as a member of the Board of Directors of the Company on May 21, 2026 at the conclusion of his term.
Max materiality 0.85 · Median 0.65 · Most common event earnings