WHITE MTNS INS GROUP LTD: Ownership & Insider Activity
Hedge funds and institutional managers reporting a position in WHITE MTNS INS GROUP LTD. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
14
13F filers
Aggregate Value
$160.1M
Across holders
Last Price
—
EOD close
Sector
—
GICS
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| Gotham Asset Management, LLC CIK 0001510387 | Hedge Fund | 18K | $37.2M | 23.2% | 0.1% | Added | +$18.4M | Q2 2026 |
| SOUTHEASTERN ASSET MANAGEMENT INC/TN/ CIK 0000807985 | Hedge Fund | 17K | $35.5M | 22.1% | 1.8% | Unchanged | $-27.7M | Q2 2026 |
| Qube Research & Technologies Ltd CIK 0001729829 | Hedge Fund | 10K | $20.1M | 12.5% | 0.0% | Added | +$17.9M | Q2 2026 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 0001164508 | Hedge Fund | 7K | $15.1M | 9.4% | 0.0% | Added | +$11.1M | Q2 2026 |
| CITADEL ADVISORS LLC CIK 0001423053 | Hedge Fund | 7K | $14.8M | 9.2% | 0.0% | Added | +$9.3M | Q2 2026 |
| SHAW D E & CO INC CIK 0001009207 | Hedge Fund | 7K | $13.7M | 8.6% | 0.0% | Reduced | $-21.6M | Q2 2026 |
| AQR CAPITAL MANAGEMENT LLC CIK 0001167557 | Hedge Fund | 5K | $11.3M | 7.1% | 0.0% | Added | +$11.3M | Q2 2026 |
| Lighthouse Investment Partners, LLC CIK 0001600344 | Hedge Fund | 2K | $3.9M | 2.4% | 0.1% | New | — | Q2 2026 |
| ExodusPoint Capital Management, LP CIK 0001736225 | Hedge Fund | 1K | $3.0M | 1.9% | 0.0% | New | — | Q2 2026 |
| Walleye Capital LLC CIK 0001758720 | Hedge Fund | 1K | $2.3M | 1.5% | 0.0% | New | — | Q2 2026 |
Added
Hedge Fund
$37.2M· 23.2% of total· 0.1% port· 18K sh· +$18.4M QoQ· Q2 2026
Unchanged
Hedge Fund
$35.5M· 22.1% of total· 1.8% port· 17K sh· $-27.7M QoQ· Q2 2026
Added
Hedge Fund
$20.1M· 12.5% of total· 0.0% port· 10K sh· +$17.9M QoQ· Q2 2026
Added
Hedge Fund
$15.1M· 9.4% of total· 0.0% port· 7K sh· +$11.1M QoQ· Q2 2026
Added
Hedge Fund
$14.8M· 9.2% of total· 0.0% port· 7K sh· +$9.3M QoQ· Q2 2026
Reduced
Hedge Fund
$13.7M· 8.6% of total· 0.0% port· 7K sh· $-21.6M QoQ· Q2 2026
Added
Hedge Fund
$11.3M· 7.1% of total· 0.0% port· 5K sh· +$11.3M QoQ· Q2 2026
New
Hedge Fund
$3.9M· 2.4% of total· 0.1% port· 2K sh· — QoQ· Q2 2026
New
Hedge Fund
$3.0M· 1.9% of total· 0.0% port· 1K sh· — QoQ· Q2 2026
New
Hedge Fund
$2.3M· 1.5% of total· 0.0% port· 1K sh· — QoQ· Q2 2026
New
Hedge Fund
$1.9M· 1.2% of total· 0.0% port· 905 sh· — QoQ· Q2 2026
Added
Hedge Fund
$898K· 0.6% of total· 0.0% port· 433 sh· $-296K QoQ· Q2 2026
Reduced
Hedge Fund
$296K· 0.2% of total· 0.0% port· 143 sh· $-506K QoQ· Q2 2026
Unchanged
Hedge Fund
$207K· 0.1% of total· 0.0% port· 100 sh· +$0 QoQ· Q2 2026
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