White Mountains Insurance Group Ltd (WTM) Insider Ownership

Historic Insider Ownership Trends

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Weston M Hicks - 2,746 0 22 May, 2025
Robert Lawrence Seelig Evp General Counsel 17,857 0 20 Mar, 2026
Mary C Choksi - 1,858 0 22 May, 2025
Morgan W Davis President, American Centennial 6,709 0 29 Dec, 2022
David Allen Tanner - 1,879 0 04 Mar, 2026
Reid Tarlton Campbell President 10,440 0 22 Dec, 2025
Peter M Carlson - 717 0 22 May, 2025
George Manning Rountree Chief Executive Officer 13,809 0 22 Dec, 2025
Suzanne F. Shank - 871 0 23 May, 2025
Philip A Gelston - 1,568 0 16 Dec, 2025
Margaret Dillon - 945 0 22 May, 2025
Steven Yi - 525 0 23 May, 2025
Michaela Hildreth Md Chief Accounting Officer 2,491 0 02 Jan, 2026
Liam P Caffrey Chief Executive Officer 3,650 0 25 Feb, 2026
Giles E Harrison President 2,675 0 25 Feb, 2026
Michael A Papamichael Chief Financial Officer 1,200 0 25 Feb, 2026

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
19 Mar, 2026 Robert Lawrence Seelig Common Shares D 50 $0.00 17,857 D G
04 Mar, 2026 David Allen Tanner Common Shares D 225 $0.00 1,879 D G
25 Feb, 2026 Michaela Hildreth Common Shares (Restricted) A 600 $0.00 1,825 D A
25 Feb, 2026 Robert Lawrence Seelig Common Shares (restricted) A 775 $0.00 2,500 D A
25 Feb, 2026 Giles E Harrison Common Shares (restricted) A 775 $0.00 2,675 D A
25 Feb, 2026 Michael A Papamichael Common Shares (Restricted) A 500 $0.00 1,200 D A
25 Feb, 2026 Liam P Caffrey Common Shares (Restricted) A 1,500 $0.00 3,650 D A
01 Jan, 2026 Michaela Hildreth Common Shares D 274 $2,078.03 2,491 D F
01 Jan, 2026 Liam P Caffrey Common Shares D 425 $2,078.03 1,655 D F
01 Jan, 2026 Robert Lawrence Seelig Common Shares D 398 $2,078.03 17,907 D F
01 Jan, 2026 Michael A Papamichael Common Shares D 131 $2,078.03 772 D F
23 Dec, 2025 Michaela Hildreth Common Shares D 60 $0.00 2,165 D G
19 Dec, 2025 Reid Tarlton Campbell Common Shares D 5,000 $0.00 10,440 D S
19 Dec, 2025 Reid Tarlton Campbell Common Shares D 5,000 $2,050.00 10,440 D S
19 Dec, 2025 George Manning Rountree Common Shares D 5,000 $2,050.00 13,809 D S
16 Dec, 2025 Philip A Gelston Common Shares D 165 $2,048.51 1,568 D S
25 Nov, 2025 Reid Tarlton Campbell Common Shares D 50 $0.00 15,440 D G
10 Nov, 2025 David Allen Tanner Common Shares D 4 $0.00 2,104 D G
22 May, 2025 Suzanne F. Shank Common Shares A 150 $0.00 871 D A
22 May, 2025 Steven Yi Common Shares A 150 $0.00 525 D A