Giles E. Harrison
President · WHITE MOUNTAINS INSURANCE GROUP LTD
Individual
- 2026
- Feb 27, 2026
- 1
Filings (90d)
Other insiders active in the same stocks
Insiders who reported open-market trades in the last 12 months at the companies Giles E. Harrison 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 in WTM purchases and sales in the last 12 months
- Philip A. Gelston - $338K in WTM purchases and sales in the last 12 months
- Reid Tarlton Campbell - WTM
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Frequently asked questions
Who is Giles E. Harrison?
Giles E. Harrison is a corporate insider, tracked as President of WHITE MOUNTAINS INSURANCE GROUP LTD (WTM). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2026, updated as new SEC EDGAR filings are processed.
When did Giles E. Harrison last file a Form 4?
The only primary Form 4 on record is dated 27 February 2026.
