White Mountains Insurance Group Ltd (WTM) insider trading
Every open-market stock purchase and sale by White Mountains Insurance Group Ltd executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Other.
Insider activity at a glance
- Insiders sold $20.8M over the last 12 months (4 sales). No open-market buys.
- Last insider buy: Weston M Hicks (Director), $857K, 2 years ago.
Last 12 months: insiders bought $0 (0 buys) and sold $20.8M (4 sales). Last close $2,105 on Sep 2, 2026.
Recent WTM insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Aug 31, 2026 | David Allen Tanner (Director) | Sold (not open market) | — |
| Aug 26, 2026 | Stephen Klar (Director) | Bought (not open market) | — |
| May 21, 2026 | Margaret Dillon (Director) | Bought (not open market) | — |
| May 21, 2026 | John Chu (Director) | Bought (not open market) | — |
| May 21, 2026 | Peter M Carlson (Director) | Bought (not open market) | — |
| May 21, 2026 | Weston M Hicks (Director) | Bought (not open market) | — |
| May 21, 2026 | Philip A Gelston (Director) | Bought (not open market) | — |
| May 21, 2026 | Reid Tarlton Campbell (Director) | Bought (not open market) | — |
| May 21, 2026 | Mary C Choksi (Director) | Bought (not open market) | — |
| May 21, 2026 | David Allen Tanner (Director) | Bought (not open market) | — |
| May 21, 2026 | Suzanne F. Shank (Director) | Bought (not open market) | — |
| Mar 19, 2026 | Robert Lawrence Seelig (VP) | Sold (not open market) | — |
| Mar 4, 2026 | David Allen Tanner (Director) | Sold (not open market) | — |
| Feb 25, 2026 | Liam P Caffrey (CEO) | Bought (not open market) | — |
| Feb 25, 2026 | Giles E Harrison (President) | Bought (not open market) | — |
| Feb 25, 2026 | Michaela Hildreth (C-suite exec) | Bought (not open market) | — |
| Feb 25, 2026 | Michael A Papamichael (CFO) | Bought (not open market) | — |
| Feb 25, 2026 | Robert Lawrence Seelig (VP) | Bought (not open market) | — |
| Jan 1, 2026 | Liam P Caffrey (CEO) | Sold (not open market) | $883K |
| Jan 1, 2026 | Robert Lawrence Seelig (VP) | Sold (not open market) | $827K |
| Jan 1, 2026 | Michaela Hildreth (C-suite exec) | Sold (not open market) | $569K |
| Jan 1, 2026 | Michael A Papamichael (CFO) | Sold (not open market) | $272K |
| Dec 23, 2025 | Michaela Hildreth (C-suite exec) | Sold (not open market) | — |
| Dec 19, 2025 | George Manning Rountree (CEO) | Sold | $10.3M |
| Dec 19, 2025 | Reid Tarlton Campbell (Director) | Sold | $10.3M |
Who's trading WTM
- David Allen Tanner, Director: other filings, last Aug 31, 2026
- Stephen Klar, Director: other filings, last Aug 26, 2026
- Peter M Carlson, Director: other filings, last May 21, 2026
- John Chu, Director: other filings, last May 21, 2026
- Margaret Dillon, Director: other filings, last May 21, 2026
- Philip A Gelston, Director: sold $338K (1 sale), last May 21, 2026
- Weston M Hicks, Director: other filings, last May 21, 2026
- Reid Tarlton Campbell, Director: sold $10.3M (2 sales), last May 21, 2026
- Mary C Choksi, Director: other filings, last May 21, 2026
- Suzanne F. Shank, Director: other filings, last May 21, 2026
- Robert Lawrence Seelig, VP: other filings, last Mar 19, 2026
- Michael A Papamichael, CFO: other filings, last Feb 25, 2026
- Giles E Harrison, C-suite exec: other filings, last Feb 25, 2026
- Liam P Caffrey, CEO: other filings, last Feb 25, 2026
- Michaela Hildreth, C-suite exec: other filings, last Feb 25, 2026
Get free alerts when an insider at White Mountains Insurance Group Ltd files a new trade →