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George Manning Rountree

CIK 1457475 · Chief Executive Officer · last filed 2025-12-22

George Manning Rountree is a Chief Executive Officer who has filed 34 SEC Form 4 insider transactions across 1 company since 2009. The most recent filing shows the insider sold $10.2M of WTM on Dec 22, 2025. Across all open-market trades the lifetime net is −$13.9M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $29.3M across reported positions. 35 SEC filings were submitted jointly with WHITE MOUNTAINS INSURANCE GROUP LTD.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$29.30M

Companies

1

Total Filings

34

Lifetime Open-Market Net

-$13.89M

Filer Profile

Reported Address
C/O 80 SOUTH MAIN STREET
HANOVER, NH 03755
Related Filers
WHITE MOUNTAINS INSURANCE GROUP LTD — 35 joint filings, latest 2025-12-22
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
WTM Chief Executive Officer 13,931 $2103.49 $29.30M -$13.89M 34 2025-12-22

Recent Filings

34 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2025-12-22 WTM Sell (S) −5,000 -$10.25M EDGAR
2025-02-28 WTM Grant (A) +1,625 $0 EDGAR
2025-01-03 WTM Tax (F) −1,067 -$2.08M EDGAR
2024-02-23 WTM Grant (A) +1,800 $0 EDGAR
2024-01-02 WTM Tax (F) −1,068 -$1.61M EDGAR
2023-02-24 WTM Grant (A) +2,000 $0 EDGAR
2023-01-03 WTM Tax (F) −1,068 -$1.51M EDGAR
2022-02-28 WTM Grant (A) +2,700 $0 EDGAR
2022-01-04 WTM Tax (F) −1,187 -$1.20M EDGAR
2021-02-26 WTM Grant (A) +2,700 $0 EDGAR
Showing 1–10 of 34
Page 1 of 4
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.