WTM insider transaction filings
WHITE MOUNTAINS INSURANCE GROUP LTD — 50 most recent Form 4 filings from SEC EDGAR, normalized by FilingPulse. Latest filing: 2026-08-31. Screen WTM transaction legs live →
Insider transaction summary — last 90 days
2026-06-24 to 2026-09-22, from the filings listed below: 2 Form 4 filings. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): none reported.
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 2.
By insider — same window
Open-market purchase/sale legs on non-derivative securities, grouped by the filing's reporting owner(s); joint filings appear once. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Insider | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|
| Klar Stephen — Director | 1 | — | — | 1 |
| Tanner David Allen — Director | 1 | — | — | 1 |
Recent Form 4 filings — WHITE MOUNTAINS INSURANCE GROUP LTD
| Filed | Form | Insider | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-31 | 4 | Tanner David Allen — Director | Gift (G): 2 @ $0 | EDGAR |
| 2026-08-27 | 4 | Klar Stephen — Director | Grant/award (A): 113 @ $0 | EDGAR |
| 2026-05-22 | 4 | Chu John — Director | Grant/award (A): 135 @ $0 | EDGAR |
| 2026-05-22 | 4 | Dillon Margaret — Director | Grant/award (A): 135 @ $0 | EDGAR |
| 2026-05-22 | 4 | Gelston Philip A — Director | Grant/award (A): 135 @ $0 | EDGAR |
| 2026-05-22 | 4 | SHANK SUZANNE F. — Director | Grant/award (A): 135 @ $0 | EDGAR |
| 2026-05-22 | 4 | Carlson Peter M — Director | Grant/award (A): 135 @ $0 | EDGAR |
| 2026-05-22 | 4 | CAMPBELL REID TARLTON — Director | Grant/award (A): 135 @ $0 | EDGAR |
| 2026-05-22 | 4 | Tanner David Allen — Director | Grant/award (A): 135 @ $0 | EDGAR |
| 2026-05-22 | 4 | CHOKSI MARY C — Director | Grant/award (A): 135 @ $0 | EDGAR |
| 2026-05-22 | 4 | Hicks Weston M — Director | Grant/award (A): 190 @ $0 | EDGAR |
| 2026-03-20 | 4 | SEELIG ROBERT LAWRENCE — EVP & General Counsel | Gift (G): 50 @ $0 | EDGAR |
| 2026-03-05 | 4 | Tanner David Allen — Director | Gift (G): 225 @ $0 | EDGAR |
| 2026-02-27 | 4 | Papamichael Michael A — Chief Financial Officer | Grant/award (A): 500 @ $0 | EDGAR |
| 2026-02-27 | 4 | Harrison Giles E — President | Grant/award (A): 775 @ $0 | EDGAR |
| 2026-02-27 | 4 | Caffrey Liam P — Chief Executive Officer, Director | Grant/award (A): 1,500 @ $0 | EDGAR |
| 2026-02-27 | 4 | Hildreth Michaela — MD & Chief Accounting Officer | Grant/award (A): 600 @ $0 | EDGAR |
| 2026-02-27 | 4 | SEELIG ROBERT LAWRENCE — EVP & General Counsel | Grant/award (A): 775 @ $0 | EDGAR |
| 2026-01-05 | 4 | Hildreth Michaela — MD & Chief Accounting Officer | Tax withholding (F): 274 @ $2,078.03 | EDGAR |
| 2026-01-02 | 4 | Papamichael Michael A — Chief Financial Officer | Tax withholding (F): 131 @ $2,078.03 | EDGAR |
| 2026-01-02 | 4 | Caffrey Liam P — Chief Executive Officer | Tax withholding (F): 425 @ $2,078.03 | EDGAR |
| 2026-01-02 | 4 | SEELIG ROBERT LAWRENCE — EVP & General Counsel | Tax withholding (F): 398 @ $2,078.03 | EDGAR |
| 2025-12-23 | 4 | Hildreth Michaela — MD & Chief Accounting Officer | Gift (G): 60 @ $0 | EDGAR |
| 2025-12-22 | 4 | Rountree George Manning — Chief Executive Officer, Director | Sale (S): 5,000 @ $2,050 | EDGAR |
| 2025-12-22 | 4 | CAMPBELL REID TARLTON — Director | Sale (S): 5,000 @ $0 | EDGAR |
| 2025-12-22 | 4/A | CAMPBELL REID TARLTON — Director | Sale (S): 5,000 @ $2,050 | EDGAR |
| 2025-12-16 | 4 | Gelston Philip A — Director | Sale (S): 165 @ $2,048.51 | EDGAR |
| 2025-11-26 | 4 | CAMPBELL REID TARLTON — Director | Gift (G): 50 @ $0 | EDGAR |
| 2025-11-10 | 4 | Tanner David Allen — Director | Gift (G): 4 @ $0 | EDGAR |
| 2025-05-27 | 4 | SHANK SUZANNE F. — Director | Grant/award (A): 150 @ $0 | EDGAR |
| 2025-05-23 | 4 | Yi Steven — Director | Grant/award (A): 150 @ $0 | EDGAR |
| 2025-05-23 | 4 | Dillon Margaret — Director | Grant/award (A): 150 @ $0 | EDGAR |
| 2025-05-23 | 4 | Gelston Philip A — Director | Grant/award (A): 150 @ $0 | EDGAR |
| 2025-05-23 | 4 | Carlson Peter M — Director | Grant/award (A): 150 @ $0 | EDGAR |
| 2025-05-23 | 4 | CAMPBELL REID TARLTON — Director | Grant/award (A): 150 @ $0 | EDGAR |
| 2025-05-23 | 4 | Tanner David Allen — Director | Grant/award (A): 150 @ $0 | EDGAR |
| 2025-05-23 | 4 | CHOKSI MARY C — Director | Grant/award (A): 150 @ $0 | EDGAR |
| 2025-05-23 | 4 | Hicks Weston M — Director | Grant/award (A): 210 @ $0 | EDGAR |
| 2025-02-28 | 4 | Harrison Giles E — EVP & Chief Strategy Officer | Grant/award (A): 900 @ $0 | EDGAR |
| 2025-02-28 | 4 | Caffrey Liam P — EVP& Chief Financial Officer | Grant/award (A): 1,025 @ $0 | EDGAR |
| 2025-02-28 | 4 | Hildreth Michaela — MD & Chief Accounting Officer | Grant/award (A): 625 @ $0 | EDGAR |
| 2025-02-28 | 4 | Rountree George Manning — Chief Executive Officer, Director | Grant/award (A): 1,625 @ $0 | EDGAR |
| 2025-02-28 | 4 | SEELIG ROBERT LAWRENCE — EVP & General Counsel | Grant/award (A): 825 @ $0 | EDGAR |
| 2025-01-03 | 4 | Caffrey Liam P — President & CFO | Tax withholding (F): 420 @ $1,945.06 | EDGAR |
| 2025-01-03 | 4 | Hildreth Michaela — MD & Chief Accounting Officer | Tax withholding (F): 323 @ $1,945.06 | EDGAR |
| 2025-01-03 | 4 | Rountree George Manning — Chief Executive Officer, Director | Tax withholding (F): 1,067 @ $1,945.06 | EDGAR |
| 2025-01-03 | 4 | SEELIG ROBERT LAWRENCE — EVP & General Counsel | Tax withholding (F): 496 @ $1,945.06 | EDGAR |
| 2024-12-02 | 4 | Hildreth Michaela — MD & Chief Accounting Officer | Gift (G): 75 @ $0 | EDGAR |
| 2024-06-10 | 4 | Harrison Giles E — EVP & Chief Strategy Officer | Grant/award (A): 1,000 @ $0 | EDGAR |
| 2024-05-24 | 4 | Hicks Weston M — Director | Grant/award (A): 230 @ $0 | EDGAR |
Recent 8-K events — WHITE MOUNTAINS INSURANCE GROUP LTD
| Filed | Form | Items reported | Source |
|---|---|---|---|
| 2026-08-27 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-08-06 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-06-05 | 8-K | 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-05-21 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 5.07 — Submission of Matters to a Vote of Security Holders 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-05-15 | 8-K | 1.01 — Entry into a Material Definitive Agreement 2.03 — Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-05-06 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-04-01 | 8-K | 8.01 — Other Events 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-02-26 | 8-K | 8.01 — Other Events 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-02-06 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-01-07 | 8-K | 8.01 — Other Events | EDGAR |
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