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Of the 10 tracked institutions holding WTM, 4 have a 3-year clone track record — 4 of them beat the S&P. Average holder's clone alpha: +4.0pt. It's a gauge of who owns the name, not just how many.
Among the 10 tracked institutional investors we monitor, WTM (WHITE MTNS INS GROUP LTD) is held with a combined value of $938.57M across 452,148 shares. The largest holder is VANGUARD GROUP INC with a position worth $489.79M. 5 funds increased their holdings. 5 funds reduced their position.
Total Institutional Value
$938.57M
Total Shares Held
452,148
Institutional Holders
10
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $489.79M | 0.01% | -4.6% |
| 2 | BlackRock, Inc. | $244.39M | 0.00% | +4.0% |
| 3 | STATE STREET CORP | $104.20M | 0.00% | +2.2% |
| 4 | Gotham Asset Management, LLC | $37.20M | 0.09% | +98.3% |
| 5 | WELLINGTON MANAGEMENT GROUP LLP | $30.13M | 0.01% | -2.4% |
| 6 | CITADEL ADVISORS LLC | $14.80M | 0.01% | +174.1% |
| 7 | AQR CAPITAL MANAGEMENT LLC | $11.30M | 0.00% | -29.6% |
| 8 | PRICE T ROWE ASSOCIATES INC /MD/ | $4.84M | 0.00% | +5.6% |
| 9 | FMR LLC | $1.63M | 0.00% | -13.1% |
| 10 | MILLENNIUM MANAGEMENT LLC | $296.50K | 0.00% | -63.0% |
| Member | Type | Date |
|---|---|---|
| James French Hill | Buy | Jun 23, 2025 |
As of the latest SEC 13F filings, VANGUARD GROUP INC is the largest institutional holder of WTM with a position worth $489.79M, representing 0.01% of their portfolio. In total, 10 institutional investors hold WTM with a combined value of $938.57M.
Institutional investors hold $938.57M worth of WTM stock across 10 positions. The largest institutional holder is VANGUARD GROUP INC with $489.79M in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For WTM, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their WTM positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
Last Close
$2,076
2026-09-10
YTD
+1.7%
64% of 52-week range
