George Manning Rountree

CIK: 0001457475

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)1 (33.3%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)1 (33.3%)

Compensation grants

Other (G, F, J, C, D, …)1 (33.3%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

WTM

WHITE MOUNTAINS INSURANCE GROUP LTD

DirectorOfficer

Discretionary Trading P&L

Holdings

Transaction History (3 total)

WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
Dec 19, 2025
Sale(S)
Direct
5K shares at avg. $2050.00$10.3M
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
Feb 26, 2025
Award(A)
Direct
1.6K shares-
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
Jan 1, 2025
Tax Payment(F)
Direct
1.1K shares at avg. $1945.06$2.1M

		Type	Shares	Price		Ownership
Dec 19, 2025	WTM WHITE MOUNTAINS INSURANCE GROUP LTD	Sale(S)	5,000	$2050.00	$10,250,000	Direct
Feb 26, 2025	WTM WHITE MOUNTAINS INSURANCE GROUP LTD	Award(A)	1,625	-	-	Direct
Jan 1, 2025	WTM WHITE MOUNTAINS INSURANCE GROUP LTD	Tax Payment(F)	1,067	$1945.06	$2,075,379	Direct

1-3 of 3 transactions

About Rountree George Manning

Rountree George Manning (SEC CIK 0001457475) files insider reports with the SEC as Chief Executive Officer of WHITE MOUNTAINS INSURANCE GROUP LTD (WTM).

Signal8 holds 3 ownership filings by Rountree George Manning, all Form 4s, filed between Jan 3, 2025 and Dec 22, 2025. Those filings report 3 transactions, from Jan 1, 2025 to Dec 19, 2025. Signal8's Form 4 history starts in Sep 2024.

The business address on Rountree George Manning's filings is in HANOVER, NH.

Recent filings by Rountree George Manning

Dec 19, 2025: Open-market sale of WTM shares (Form 4, code S).
Feb 26, 2025: Grant or award of WTM shares (Form 4, code A).
Jan 1, 2025: Tax withholding of WTM shares (Form 4, code F).

Other insiders filing for WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)

Tanner David Allen, Director
Klar Stephen, Director
SHANK SUZANNE F., Director
Hicks Weston M, Director
Gelston Philip A, Director
Dillon Margaret, Director

How to read Form 4 transaction codes