Summary
Updated Aug 30, 2026
Philip A. Gelston is Director of WHITE MOUNTAINS INSURANCE GROUP LTD (WTM). 2 SEC Form 4 filings on record going back to 2025, most recently on 22 May 2026. Most recent open-market trade: sold $338K of WTM on 16 December 2025. Lifetime open-market sales: $338K.
Recent Transactions
2Every recent SEC Form 4 transaction Philip A. Gelston has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Philip A. Gelston files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- George Manning Rountree - $10.25M of WTM open-market activity in the last 12 months
- Reid Tarlton Campbell - of WTM open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Philip A. Gelston?
Philip A. Gelston is a corporate insider, tracked as Director of WHITE MOUNTAINS INSURANCE GROUP LTD (WTM). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Philip A. Gelston last file a Form 4?
The most recent primary Form 4 on record is dated 22 May 2026, one of 2 filings going back to 2025.
Has Philip A. Gelston been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($338K) across all tracked filings.
Where can I see all of Philip A. Gelston's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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