White Mountains Insurance Group (WTM) — insider trading
Financials · NYSE
White Mountains Insurance Group (WTM) has 13 reported SEC Form 4 insider transactions in our data (latest 2026-08-31).
Recent Form 4 transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-08-31 | Tanner David Allen | Director | Bona fide gift | 2 | — | $0 | Form 4 |
| 2026-08-26 | Klar Stephen | Director | Grant / award / vesting | 113 | — | $0 | Form 4 |
| 2026-05-21 | CAMPBELL REID TARLTON | Director | Grant / award / vesting | 135 | — | $0 | Form 4 |
| 2026-05-21 | Carlson Peter M | Director | Grant / award / vesting | 135 | — | $0 | Form 4 |
| 2026-05-21 | CHOKSI MARY C | Director | Grant / award / vesting | 135 | — | $0 | Form 4 |
| 2026-05-21 | Chu John | Director | Grant / award / vesting | 135 | — | $0 | Form 4 |
| 2026-05-21 | Dillon Margaret | Director | Grant / award / vesting | 135 | — | $0 | Form 4 |
| 2026-05-21 | Gelston Philip A | Director | Grant / award / vesting | 135 | — | $0 | Form 4 |
| 2026-05-21 | Hicks Weston M | Director | Grant / award / vesting | 190 | — | $0 | Form 4 |
| 2026-05-21 | SHANK SUZANNE F. | Director | Grant / award / vesting | 135 | — | $0 | Form 4 |
| 2026-05-21 | Tanner David Allen | Director | Grant / award / vesting | 135 | — | $0 | Form 4 |
| 2026-03-19 | SEELIG ROBERT LAWRENCE | Officer (EVP & General Counsel) | Bona fide gift | 50 | — | $0 | Form 4 |
| 2026-03-04 | Tanner David Allen | Director | Bona fide gift | 225 | — | $0 | Form 4 |
Ask the chat about WTM's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: White Mountains Insurance Group (WTM).
Last updated 2026-08-31 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.