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Of the 12 tracked institutions holding WTM, 6 have a 3-year clone track record — 5 of them beat the S&P. Average holder's clone alpha: +4.3pt. It's a gauge of who owns the name, not just how many.
Among the 12 tracked institutional investors we monitor, WTM (WHITE MTNS INS GROUP LTD) is held with a combined value of $936.40M across 438,984 shares. The largest holder is VANGUARD GROUP INC with a position worth $489.79M. Bridgewater Associates, LP opened a new position in the most recent quarter. 6 funds increased their holdings. 5 funds reduced their position.
Total Institutional Value
$936.40M
Total Shares Held
438,984
Institutional Holders
12
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. | $248.98M | 0.00% | +0.9% |
| 3 | STATE STREET CORP | $108.00M | 0.00% | -3.0% |
| 4 | WELLINGTON MANAGEMENT GROUP LLP | $32.70M | 0.01% | -6.6% |
| 5 | Gotham Asset Management, LLC | $19.88M | 0.06% | +34.7% |
| 6 | AQR CAPITAL MANAGEMENT LLC | $17.00M | 0.01% | +72.9% |
| 7 | RENAISSANCE TECHNOLOGIES LLC | $5.74M | 0.01% | +74.0% |
| 8 | CITADEL ADVISORS LLC | $5.72M | 0.00% | +118.2% |
| 9 | PRICE T ROWE ASSOCIATES INC /MD/ | $4.86M | 0.00% | +11.1% |
| 10 | FMR LLC | $1.99M | 0.00% | -3.6% |
| 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, 12 institutional investors hold WTM with a combined value of $936.40M.
In the most recent quarter, 1 fund opened a new position in WTM. Additionally, 6 increased their holdings and 5 reduced their positions.
Institutional investors hold $936.40M worth of WTM stock across 12 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
$2,208
2026-07-24
YTD
+8.1%
83% of 52-week range
