WHITE MTNS INS GROUP LTD (WTM) Institutional Ownership Changes & 13F Activity
WHITE MTNS INS GROUP LTD (WTM). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Gendell Jeffrey L, Raymond James Financial Inc, Gotham Asset Management, Llc, Qube Research & Technologies Ltd, and T. Rowe Price Investment Management, Inc..
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Manufacturers Life Insurance Company, The | Buy | +3 | +0.5% | 617 | $1.28M | Q2 2026 | Sep 09, 2026 |
| Citadel Advisors Llc | Buy | +4,533 | +174.1% | 7,136 | $14.80M | Q2 2026 | Sep 02, 2026 |
| Allianz Asset Management Gmbh | Buy | +844 | — | 844 | $1.75M | Q2 2026 | Sep 02, 2026 |
| Corient Private Wealth Llc | Sell | -787 | -56.3% | 611 | $1.27M | Q2 2026 | Aug 27, 2026 |
| California State Teachers Retirement System | Sell | -126 | -4.4% | 2,761 | $5.72M | Q2 2026 | Aug 24, 2026 |
| Mercer Global Advisors Inc | Buy | +189 | +21.8% | 1,055 | $2.19M | Q2 2026 | Aug 19, 2026 |
| Beacon Pointe Advisors, Llc | Buy | +178 | — | 178 | $369.06K | Q2 2026 | Aug 18, 2026 |
| Empowered Funds, Llc | Sell | -1,181 | -92.0% | 103 | $213.56K | Q2 2026 | Aug 17, 2026 |
| Public Employees Retirement System Of Ohio | Sell | -30 | -4.0% | 721 | $1.49M | Q2 2026 | Aug 17, 2026 |
| Gendell Jeffrey L | Buy | +21,429 | +56.7% | 59,243 | $122.83M | Q2 2026 | Aug 14, 2026 |
| Raymond James Financial Inc | Sell | -9,118 | -38.1% | 14,833 | $30.75M | Q2 2026 | Aug 14, 2026 |
| Gotham Asset Management, Llc | Buy | +8,893 | +98.3% | 17,940 | $37.20M | Q2 2026 | Aug 14, 2026 |
| Qube Research & Technologies Ltd | Buy | +8,657 | +852.1% | 9,673 | $20.06M | Q2 2026 | Aug 14, 2026 |
| T. Rowe Price Investment Management, Inc. | Sell | -7,276 | -17.5% | 34,237 | $70.99M | Q2 2026 | Aug 14, 2026 |
| Hrt Financial Lp | Buy | +4,385 | +184.6% | 6,760 | $14.02M | Q2 2026 | Aug 14, 2026 |
| Goldman Sachs Group Inc | Sell | -3,632 | -23.0% | 12,151 | $25.19M | Q2 2026 | Aug 14, 2026 |
| Invesco Ltd. | Buy | +3,497 | — | 3,497 | $7.25M | Q2 2026 | Aug 14, 2026 |
| Jane Street Group, Llc | Buy | +3,418 | +24.8% | 17,226 | $35.72M | Q2 2026 | Aug 14, 2026 |
| Bank Of America Corp | Sell | -3,330 | -11.7% | 25,028 | $51.89M | Q2 2026 | Aug 14, 2026 |
| London Co Of Virginia | Sell | -3,106 | -5.4% | 54,025 | $112.08M | Q2 2026 | Aug 14, 2026 |
| Sei Investments Co | Sell | -2,990 | -26.9% | 8,108 | $16.81M | Q2 2026 | Aug 14, 2026 |
| Ameriprise Financial Inc | Buy | +2,852 | — | 2,852 | $5.91M | Q2 2026 | Aug 14, 2026 |
| Aqr Capital Management Llc | Sell | -2,299 | -29.7% | 5,439 | $11.28M | Q2 2026 | Aug 14, 2026 |
| D. E. Shaw & Co., Inc. | Sell | -2,292 | -25.7% | 6,618 | $13.72M | Q2 2026 | Aug 14, 2026 |
| Lighthouse Investment Partners, Llc | Buy | +1,868 | — | 1,868 | $3.87M | Q2 2026 | Aug 14, 2026 |
| Longleaf Partners | Sell | -1,760 | -9.3% | 17,104 | $35.46M | Q2 2026 | Aug 14, 2026 |
| Xtx Topco Ltd | Buy | +1,394 | +557.6% | 1,644 | $3.41M | Q2 2026 | Aug 14, 2026 |
| Wallace Capital Management Inc. | Buy | +1,272 | +1.6% | 80,067 | $166.01M | Q2 2026 | Aug 14, 2026 |
| California Public Employees Retirement System | Sell | -1,166 | -18.2% | 5,248 | $10.88M | Q2 2026 | Aug 14, 2026 |
| Squarepoint Ops Llc | Buy | +905 | — | 905 | $1.88M | Q2 2026 | Aug 14, 2026 |
Frequently asked questions about WTM activity
Which institutional owners are buying WTM?
Institutional owners buying WTM include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in WTM activity?
"Buy" means an investor increased their reported position in WTM compared to the prior reporting period. This reflects growing exposure to WHITE MTNS INS GROUP LTD (WTM) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in WTM increasing?
Institutional interest in WTM can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.
Related WTM Institutional Insights
- WTM Overview
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- Financial Services Sector Institutional Ownership
- Financial Services Sector Portfolio Overlap
- Institutional Portfolio Overlap & Shared Holdings
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- Most Sold Financial Services Stocks By Institutional Investors
- WTM Insider Trading & SEC Form 4 Activity
- WTM Articles
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