Reid Tarlton Campbell

CIK: 0001378156

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)2 (40.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)2 (40.0%)

Compensation grants

Other (G, F, J, C, D, …)1 (20.0%)

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

Companies & Roles (1)

WTM

WHITE MOUNTAINS INSURANCE GROUP LTD

Director

Discretionary Trading P&L

Holdings

Transaction History (5 total)

WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
May 21, 2026
Award(A)
Direct
135 shares-
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
Dec 19, 2025
Sale(S)
Direct
5K shares-
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
Nov 25, 2025
Gift(G)
Direct
50 shares-
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
May 22, 2025
Award(A)
Direct
150 shares-

		Type	Shares	Price		Ownership
May 21, 2026	WTM WHITE MOUNTAINS INSURANCE GROUP LTD	Award(A)	135	-	$0	Direct
Dec 19, 2025	WTM WHITE MOUNTAINS INSURANCE GROUP LTD	Sale(S)	5,000	$2050.00	$10,250,000	Direct
Dec 19, 2025	WTM WHITE MOUNTAINS INSURANCE GROUP LTD	Sale(S)	5,000	-	-	Direct
Nov 25, 2025	WTM WHITE MOUNTAINS INSURANCE GROUP LTD	Gift(G)	50	-	-	Direct
May 22, 2025	WTM WHITE MOUNTAINS INSURANCE GROUP LTD	Award(A)	150	-	-	Direct

1-5 of 5 transactions

About CAMPBELL REID TARLTON

CAMPBELL REID TARLTON (SEC CIK 0001378156) files insider reports with the SEC as Director of WHITE MOUNTAINS INSURANCE GROUP LTD (WTM).

Signal8 holds 5 ownership filings by CAMPBELL REID TARLTON, all Form 4s, filed between May 23, 2025 and May 22, 2026. Those filings report 5 transactions, from May 22, 2025 to May 21, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on CAMPBELL REID TARLTON's filings is in HANOVER, NH.

Recent filings by CAMPBELL REID TARLTON

May 21, 2026: Grant or award of WTM shares (Form 4, code A).
Dec 19, 2025: Open-market sales of WTM shares (2 lines, Form 4, code S).
Nov 25, 2025: Gift of WTM shares (Form 4, code G).
May 22, 2025: Grant or award of WTM shares (Form 4, code A).

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