Highest-materiality recent filing
White Mountains Q2 book value per share up 4% to $2,258; Ark combined ratio 84%
Book value per share $2,258, up 4% in Q2; comprehensive income $199M.
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.
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 acquires 51% controlling interest in Distinguished Programs for $230M
Acquisition includes existing ~1% interest; total cash consideration ~$230M for 51% controlling stake.
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 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 Q1 ABVPS up 6% to $1,797; MediaAlpha gain $211M
Comprehensive income $236M vs $180M YoY; driven by $211M MediaAlpha unrealized gains.
White Mountains appoints Giles Harrison EVP/CSO, Liam Caffrey named President
Giles Harrison to become EVP & Chief Strategy Officer on June 10, 2024.
White Mountains reports Q4 2023 ABVPS up 7% to $1,704; full-year ABVPS up 14%
Comprehensive income attributable to common shareholders: $288M Q4, $511M full year 2023.
White Mountains closes acquisition of 72.8% of Bamboo IDE8 for $296.7M
Closed merger and primary investment in Bamboo IDE8 Insurance Services on January 2, 2024.
White Mountains renews $250M Outrigger Re sidecar; WTM commits $130M for 2024
Outrigger Re Ltd. renewed on similar terms as 2023 for Ark's global property catastrophe portfolio starting Jan 1, 2024.
White Mountains Q3 ABVPS up 1% to $1,588; acquires Bamboo, launches WM Partners
Book value per share $1,542, adjusted $1,588, both up 1% in Q3 and 6% YTD including dividends.
White Mountains to acquire ~70% of Bamboo for ~$285M; California homeowners MGA
White Mountains to invest approx. $285M for ~70% of Bamboo, a California homeowner MGA.
White Mountains reports 1% ABVPS increase in Q2; Ark GWP up 50% YoY
Book value per share $1,532; adjusted book value per share $1,576 as of June 30, 2023.
White Mountains Q1 ABVPS up 5% to $1,567; Ark combined ratio 94%, GWP up 28%
Comprehensive income attributable to common shareholders $180M vs $31M in Q1 2022.
White Mountains Q4 ABVPS up 2% to $1,495; full-year ABVPS +26%
Comprehensive income $40M in Q4, $788M for full year 2022, driven by NSM sale gain of $876M.
White Mountains leads $250M reinsurance sidecar Outrigger Re for Ark
Outrigger Re Ltd. formed as a Bermuda special purpose insurer with $250M total capital.
Adjusted BVPS of $1,471 as of Sept 30, up 28% quarter-over-quarter; YTD increase including dividends of 24%.
White Mountains Q2 comprehensive loss of $174M; closes NSM sale adding ~$300 per share to book value
Comprehensive loss attributable to common shareholders of $174M in Q2 2022 vs. $139M gain in Q2 2021.
White Mountains completes sale of NSM Insurance Group to Carlyle for $1.4B net cash proceeds
Completed sale of NSM Insurance Group to Carlyle on August 1, 2022, receiving $1.4B net cash proceeds.
Kudu raises $114M from MassMutual and White Mountains; WTM ownership drops to 89%
MassMutual invests $64M, WM Regent (White Mountains) invests $50M at ~1.3x Dec 2021 equity.
On August 26, 2026, the Board of Directors (the “Board”) of White Mountains Insurance Group, Ltd. (the “Company”) elected Stephen Klar as a director of the Company.
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.
Liam Caffrey, 52, has been named President of the Company.
On June 10, 2024, Giles E. Harrison, 55, will become Executive Vice President and Chief Strategy Officer of White Mountains Insurance Group, Ltd.
On February 22, 2024, the Board of Directors (the “Board”) of White Mountains Insurance Group, Ltd. (the “Company”) elected Reid T. Campbell as a director of the Company.
On February 22, 2024, Mr. Campbell retired from employment with the Company after thirty years of service in various roles, including the roles of Chief Financial Officer and, most recently, President.
Morgan W. Davis retired from the Board
elected Weston M. Hicks as Chairman of the Board
On February 22, 2023, the Board of Directors (the “Board”) of White Mountains Insurance Group, Ltd. (the “Company”) elected Weston M. Hicks as a new director, effective immediately.
On March 1, 2022, Liam P. Caffrey, 49, will become Executive Vice President and Chief Financial Officer of White Mountains Insurance Group, Ltd. (the “Company”).
Reid T. Campbell, the current Executive Vice President and Chief Financial Officer of the Company, will become President of the Company on March 1, 2022 and will serve in that role until his retirement in February 2024.
On October 10, 2021, the Board of Directors (the “Board”) of White Mountains Insurance Group, Ltd. (the “Company”) elected Suzanne Shank as a new director, effective immediately.
Max materiality 0.85 · Median 0.65 · Most common event earnings