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Holder clone rankings through .
Of the 10 tracked institutions holding WTM, 2 have a 3-year clone track record — 2 of them beat the S&P. Average holder's clone alpha: +1.8pt. It's a gauge of who owns the name, not just how many.
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 →
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.
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Last Close
$2,209
2026-10-28
YTD
+8.2%
75% of 52-week range