Stocks › WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
WTM·NYSE·
United States·USD
United States·USD$2037.25
+17.81 (+0.88%)
Close · Oct 6, 2026 · Close Prices from Tiingo.com
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD · NYSE
Nasdaq 100S&P 500
Filings
Default90D1Y5YALL
WTMS&P 500 (rebased)
Congress BuyCongress SellInsider BuyInsider SellForm 1448-K ResultsLobbying
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Daily closes, adjusted for splits and dividends · Close Prices from Tiingo.comHover a marker, every one is a filing · move across the line for the crosshair
Congressional Trades
Recent trades of WTM by members of U.S. Congress · 27 on record · 1 in the last 12 months
Whale Activity
Position changes in WTM reported for 2026-06-30 by 1 tracked institutional filer
- Increased0
- New0
- Held0
- Decreased0
- Closed0
- No prior filing1
| Filer | Shares | Value | Change |
|---|---|---|---|
| FIDUCIARY MANAGEMENT INC /WI/ | 66.5K | $138.0M | — |
KeyVex tracks a curated set of large 13F filers plus the largest positions in recent filings, so this is a sample of institutional activity, not the whole market.
Insider Trading
Net shares bought (+) or sold (−) on the open market by WTM insiders, by quarter · Form 4
Recent Insider Transactions
859 transactions on record · newest first
| Insider | Type | Shares | Price | Value | Date | |
|---|---|---|---|---|---|---|
| Tanner David AllenDirector | Grant / award | +135 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| SHANK SUZANNE F.Director | Grant / award | +135 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| Hicks Weston MDirector | Grant / award | +190 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| Gelston Philip ADirector | Grant / award | +135 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| Dillon MargaretDirector | Grant / award | +135 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| Chu JohnDirector | Grant / award | +135 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| CHOKSI MARY CDirector | Grant / award | +135 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| Carlson Peter MDirector | Grant / award | +135 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| CAMPBELL REID TARLTONDirector | Grant / award | +135 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| SEELIG ROBERT LAWRENCEEVP & General Counsel | Gift | −50 | $0.00 | $0 | Mar 19, 2026 | Form 4 ↗ |
| Tanner David AllenDirector | Gift | −225 | $0.00 | $0 | Mar 4, 2026 | Form 4 ↗ |
| Caffrey Liam PChief Executive Officer · Director | Grant / award | +1,500 | $0.00 | $0 | Feb 25, 2026 | Form 4 ↗ |
| Harrison Giles EPresident | Grant / award | +775 | $0.00 | $0 | Feb 25, 2026 | Form 4 ↗ |
| Hildreth MichaelaMD & Chief Accounting Officer | Grant / award | +600 | $0.00 | $0 | Feb 25, 2026 | Form 4 ↗ |
| Papamichael Michael AChief Financial Officer | Grant / award | +500 | $0.00 | $0 | Feb 25, 2026 | Form 4 ↗ |
| SEELIG ROBERT LAWRENCEEVP & General Counsel | Grant / award | +775 | $0.00 | $0 | Feb 25, 2026 | Form 4 ↗ |
| Hildreth MichaelaMD & Chief Accounting Officer | Tax withholding | −274 | $2078.03 | $569K | Jan 1, 2026 | Form 4 ↗ |
| Papamichael Michael AChief Financial Officer | Tax withholding | −131 | $2078.03 | $272K | Jan 1, 2026 | Form 4 ↗ |
| SEELIG ROBERT LAWRENCEEVP & General Counsel | Tax withholding | −398 | $2078.03 | $827K | Jan 1, 2026 | Form 4 ↗ |
| Caffrey Liam PChief Executive Officer | Tax withholding | −425 | $2078.03 | $883K | Jan 1, 2026 | Form 4 ↗ |
Fund Holders
Mutual funds and ETFs holding WTM · SEC Form N-PORT
| Fund | Shares | Value | % of fund | As of |
|---|---|---|---|---|
| VANGUARD TOTAL STOCK MARKET INDEX FUND VANGUARD INDEX FUNDS | 74.7K | $154.8M | 0.01% | Jun 30, 2026 |
| VANGUARD SMALL-CAP INDEX FUND VANGUARD INDEX FUNDS | 54.0K | $111.9M | 0.06% | Jun 30, 2026 |
| VANGUARD SELECTED VALUE FUND VANGUARD WHITEHALL FUNDS | 34.9K | $73.3M | 1.05% | Jul 31, 2026 |
| VANGUARD SMALL-CAP VALUE INDEX FUND VANGUARD INDEX FUNDS | 34.2K | $70.9M | 0.10% | Jun 30, 2026 |
| VANGUARD EXTENDED MARKET INDEX FUND VANGUARD INDEX FUNDS | 28.0K | $58.1M | 0.06% | Jun 30, 2026 |
| Avantis U.S. Small Cap Value ETF American Century ETF Trust | 24.6K | $50.8M | 0.19% | May 31, 2026 |
| Dimensional U.S. Targeted Value ETF Dimensional ETF Trust | 17.4K | $36.4M | 0.25% | Jul 31, 2026 |
| Longleaf Partners Small Cap Fund Longleaf Partners Funds Trust | 15.2K | $31.6M | 4.90% | Jun 30, 2026 |
| Dimensional US Small Cap Value ETF Dimensional ETF Trust | 13.0K | $27.3M | 0.33% | Jul 31, 2026 |
| VANGUARD GLOBAL MINIMUM VOLATILITY FUND VANGUARD WHITEHALL FUNDS | 11.3K | $23.7M | 1.18% | Jul 31, 2026 |
Mutual funds and ETFs whose N-PORT filings list WTM's shares (CUSIP G9618E107), each fund at its latest report since Mar 7, 2026, largest positions first. Bonds, options and short positions are left out.
Corporate Lobbying
Estimated quarterly lobbying spending reported under the LDA, filings naming WHITE MOUNTAINS INSURANCE GROUP LTD as client
No lobbying filings found naming WHITE MOUNTAINS INSURANCE GROUP LTD as the client.
Government Contracts
Federal awards to WHITE MOUNTAINS INSURANCE GROUP LTD · USAspending
No federal contract awards found for WHITE MOUNTAINS INSURANCE GROUP LTD.
U.S. Patents
Recent USPTO applications naming WHITE MOUNTAINS INSURANCE GROUP LTD
No USPTO patent applications found for WHITE MOUNTAINS INSURANCE GROUP LTD.
Annual Financials
From WTM's 10-K filings · XBRL
No annual XBRL figures on record for WTM. KeyVex's fundamentals cover about 130 large companies so far.
Stock Splits
Every split and reverse split in the price history
No stock splits in WTM's price history.
Material Events (8-K)
Corporate events filed with the SEC
- 8-K · Items 5.02, 9.01Officer / director changeAug 27, 2026
EDGAR ↗ - 8-K · Items 2.02, 9.01Results of operationsAug 6, 2026
EDGAR ↗ - 8-K · Items 7.01, 9.01Reg FD disclosureJun 5, 2026
EDGAR ↗ - 8-K · Items 5.02, 5.07, 9.01Officer / director change · Shareholder voteMay 21, 2026
EDGAR ↗ - 8-K · Items 1.01, 2.03, 9.01Material agreement · Direct financial obligationMay 15, 2026
EDGAR ↗ - 8-K · Items 2.02, 9.01Results of operationsMay 6, 2026
EDGAR ↗
About WHITE MOUNTAINS INSURANCE GROUP LTD
From SEC EDGAR company records
Industry (SIC 6331)Fire, Marine & Casualty Insurance
SectorFinancials
HeadquartersHANOVER, NH
IncorporatedD0
SEC CIK0000776867 ↗
Former namesWHITE MOUNTAINS INSURANCE GROUP INC, FUND AMERICAN ENTERPRISES HOLDINGS INC