Who
Philip A. Gelston
Director
Company insider
Files Form 4 as: Director, White Mountains Insurance Group.
In numbers
- Trades disclosed
- 12
- Buys
- 0
- Sells
- 1
- Bought
- $0
- Sold
- $338K
- Companies
- 1
- Companies where not an officer
- 1
- First trade
- 1 Mar 2018
- Last trade
- 21 May 2026
- Last filed
- 22 May 2026
Companies traded
Activity over time
1 Dec 2025 – 1 Oct 2026
Buys above the line, sells below, each month.
Every trade
| Traded | Company | What | Amount | |
|---|---|---|---|---|
| 21 May 2026filed 22 May 2026 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Code A | —135 at $0.00 | filing |
| 21 May 2026filed 22 May 2026 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Code A | —135 at $0.00 | filing |
| 16 Dec 2025filed 16 Dec 2025 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Sold | $338K165 at $2,048.51 | filing |
| 22 May 2025filed 23 May 2025 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Code A | —150 at $0.00 | filing |
| 23 May 2024filed 24 May 2024 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Code A | —165 at $0.00 | filing |
| 25 May 2023filed 26 May 2023 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Code A | —180 at $0.00 | filing |
| 26 May 2022filed 27 May 2022 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Code A | —225 at $0.00 | filing |
| 27 May 2021filed 28 May 2021 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Code A | —225 at $0.00 | filing |
| 21 May 2020filed 22 May 2020 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Code A | —225 at $0.00 | filing |
| 23 May 2019filed 28 May 2019 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Code A | —250 at $0.00 | filing |
| 24 May 2018filed 25 May 2018 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Code A | —250 at $0.00 | filing |
| 1 Mar 2018filed 5 Mar 2018 | WTM White Mountains Insurance GroupInsurance | SEC FORM 4 Code A | —63 at $0.00 | filing |
News
How Efficiency and AI Support White Mountains Insurance Group, Ltd.'s (WTM) Revaluation ThesisWTM · insidermonkey.com · 16 Oct 2026
0 headlines in the last 90 days name Philip A. Gelston; 1 article from the last 14 days about the 1 company they traded most, at most three about any one of them.