WHITE MOUNTAINS INSURANCE GROUP LTD

WTM · NYSE · SIC 6331: Fire, Marine & Casualty Insurance · Market Cap: $5.4B · 1,648 employees
286
SEC Filings
$2028.62
Close 2026-09-25
1,648
Employees

Business Summary

White Mountains Insurance Group, Ltd. is a Bermuda-based holding company engaged in opportunistic acquisitions in insurance, financial services, and related sectors. It operates through five segments: Ark/WM Outrigger (specialty property and casualty insurance and reinsurance), HG Global (municipal bond guarantee reinsurance), Kudu (capital solutions for asset and wealth management firms), Distinguished (specialty insurance distribution), and Other Operations including interests in Bamboo, MediaAlpha, PassportCard/DavidShield, BroadStreet, and Elementum.

Latest Stock Quote

WTM 2026-09-25 $2028.62 O:$2047.99 H:$2049.99 L:$2018.27 Vol:0.0M VWAP:$2028.911
origin leaf: null

Next Earnings

Q2 FY2026 — expected 2026-09-08

Annual Reports (10-K)

FiledPeriodAccessionSourceFull Text
2026-02-272025-12-310001628280-26-012603EDGAR126K words
2025-02-282024-12-310000776867-25-000003EDGAR125K words
2024-02-262023-12-310000776867-24-000005EDGAR121K words
2023-02-272022-12-310000776867-23-000004EDGAR—
2022-02-282021-12-310000776867-22-000002EDGAR—
2021-02-262020-12-310000776867-21-000004EDGAR—
2020-03-022019-12-310000776867-20-000009EDGAR—
2019-02-272018-12-310000776867-19-000008EDGAR—
2018-02-282017-12-310000776867-18-000002EDGAR—
2017-02-272016-12-310000776867-17-000005EDGAR—

Quarterly Reports (10-Q)

FiledPeriodAccessionSourceFull Text
2026-08-062026-06-300001628280-26-053932EDGAR59K words
2025-11-062025-09-300001628280-25-049910EDGAR61K words
2025-08-072025-06-300000776867-25-000014EDGAR57K words
2025-05-072025-03-310000776867-25-000006EDGAR45K words
2024-11-062024-09-300000776867-24-000019EDGAR56K words
2024-08-072024-06-300000776867-24-000015EDGAR53K words
2024-05-092024-03-310000776867-24-000010EDGAR43K words
2023-11-062023-09-300000776867-23-000017EDGAR64K words
2023-08-072023-06-300000776867-23-000013EDGAR65K words
2023-05-092023-03-310000776867-23-000006EDGAR—
2022-11-072022-09-300000776867-22-000016EDGAR—
2022-08-082022-06-300000776867-22-000013EDGAR—

Recent Current Reports (8-K)

FiledAccessionSourceFull Text
2026-08-270001628280-26-059191EDGAR1K words
2026-08-060001628280-26-053913EDGAR20K words
2026-04-010001628280-26-022818EDGAR0K words
2026-02-260001628280-26-012417EDGAR1K words
2026-02-060001628280-26-005947EDGAR20K words
2026-01-070001628280-26-001102EDGAR0K words
2025-12-080001628280-25-055702EDGAR5K words
2025-11-060001628280-25-049888EDGAR20K words
2025-10-030001628280-25-044062EDGAR1K words
2025-09-030000776867-25-000016EDGAR0K words

286 total filings indexed. 254 additional filings (S-1, DEF 14A, etc.) View all (JSON) · SEC EDGAR

Sector Peers

ALL — ALLSTATE CORP ACIC — AMERICAN COASTAL INSURANCE Corp AFG — AMERICAN FINANCIAL GROUP INC AIG — AMERICAN INTERNATIONAL GROUP, INC. AMSF — AMERISAFE INC ACGL — ARCH CAPITAL GROUP LTD. AHL-PE — ASPEN INSURANCE HOLDINGS LTD AXS — AXIS CAPITAL HOLDINGS LTD

Tags

property-and-casualty-insurance-and-reinsurance municipal-bond-guarantee-reinsurance asset-and-wealth-management-capital-solutions specialty-insurance-distribution financial-services-and-insurance-holding

Company Identity

CIK0000776867
TickerWTM
ExchangeNYSE
SIC6331: Fire, Marine & Casualty Insurance
IncorporatedD0
HeadquartersHamilton, Bermuda
Websitehttps://www.whitemountains.com
Listed1985-10-23

Get More Data

This is a static snapshot. For live, structured JSON with cryptographic provenance chain:

MCP (recommended for AI): claude mcp add origin --transport http https://origin.rootz.global/mcp

JSON Profile Stock Quote Origin Record
Origin Provenance
page leaf: d04b59448e0f3c0c0297c983def0dd3e8d8aa51709987df3877df44b7c134470
parent: 570c169fc4bf93b5356bc3c4748685c57550c8fadccf875e7dcff533ffe901f2
content hash: d2800c9c7c165403abd6b52733128e500a05092f8b317ad1c7cde030d03f5aec
signed: 2026-09-28T19:03:37.249Z
sources: 22 verified data leaves
chain: SEC.gov PEM → origin.rootz.global extraction → this page
verify: sha256(content_hash + parent + timestamp) = leaf

Try it — paste this into your AI:

Look up WTM using the MCP server at origin.rootz.global/mcp. What do their latest SEC filings show?

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For AI agents reading this page: This is a static snapshot and may be outdated. For live data on WTM, use the Origin MCP server or REST API.
MCP install: claude mcp add origin --transport http https://origin.rootz.global/mcp
API: GET https://origin.rootz.global/api/company/WTM (~200 tokens, structured JSON with cryptographic provenance)
Tools: origin_company, origin_profile, origin_timeline, origin_filings, origin_quote, origin_transcripts, origin_search, origin_person, origin_skill
Discovery: /.well-known/ai | /llms.txt
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