List of insiders holdings for WHITE MOUNTAINS INSURANCE GROUP LTD:
- Shares directly owned by the insider.
- Shares indirectly owned by the insider.
- Total shares owned by the insider (sum of shares directly and indirectly owned).
- Total market value if available.
- Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
What is insider trading>>
- Peter Lynch
What is insider trading>>
| # | Insider Holder Name | Report Date Time | Shares Owned Directly Indirectly | Total Shares Owned | Filing |
| 1 | BYRNE JOHN JOSEPH 10% Owner | 2013-02-06 16:03:33 | 207,396 429,721 | 637,117 | Form 3 |
| 2 | BYRNE MARK JAMES Director | 2004-02-10 08:21:16 | 0 222,156 | 222,156 | Form 5 |
| 3 | KEMP KARL THOMAS Director | 2004-03-26 08:33:52 | 71,390 23,629 | 95,019 | Form 4 |
| 4 | BARRETTE RAYMOND JOSEPH RENE Chief Executive Officer | 2017-03-03 16:07:49 | 45,988 12,866 | 58,854 | Form 4 |
| 5 | GILLESPIE JOHN DAVIES Director | 2015-02-11 14:55:19 | 3,025 50,014 | 53,039 | Form 5 |
| 6 | FASS STEVE ELLIOTT Director | 2007-02-27 16:22:37 | 33,104 4,043 | 37,147 | Form 4 |
| 7 | FOY DAVID THOMAS Chief Financial Officer | 2017-05-26 16:33:17 | 30,537 76 | 30,613 | Form 4 |
| 8 | WATERS ALLAN LEWIS CEO - Sirius Int'l Ins. Group | 2015-02-27 15:24:57 | 13,854 8,120 | 21,974 | Form 4 |
| 9 | SEELIG ROBERT LAWRENCE EVP & General Counsel | 2026-03-20 14:51:41 | 20,357 587 | 20,944 | Form 4 |
| 10 | Rountree George Manning Chief Executive Officer | 2025-12-22 10:13:58 | 19,234 122 | 19,356 | Form 4 |
| 11 | CAMPBELL REID TARLTON Director | 2025-12-22 16:51:07 | 10,440 119 | 10,559 | Form 4/A |
| 12 | ZANKEL ARTHUR Director | 2004-02-10 08:33:10 | 8,600 0 | 8,600 | Form 5 |
| 13 | COCHRAN ROBERT PHILLIPS Director | 2011-05-31 17:34:36 | 8,045 0 | 8,045 | Form 4 |
| 14 | DAVIS MORGAN W Director | 2022-12-29 09:26:52 | 6,709 1,030 | 7,739 | Form 4 |
| 15 | Linker David Chief Investment Officer | 2017-03-03 16:24:29 | 6,153 15 | 6,168 | Form 4 |
| 16 | Caffrey Liam P Chief Executive Officer | 2026-02-27 11:19:11 | 5,305 8 | 5,313 | Form 4 |
| 17 | Hildreth Michaela MD & Chief Accounting Officer | 2026-02-27 11:18:22 | 4,316 20 | 4,336 | Form 4 |
| 18 | Brouillette Yves Director | 2019-05-28 17:21:53 | 4,121 0 | 4,121 | Form 4 |
| 19 | Oberting Kernan V Managing Director Director | 2016-01-05 14:24:21 | 3,899 23 | 3,922 | Form 4 |
| 20 | Bazos Frank R EVP and Head of M&A | 2020-03-02 16:16:49 | 3,600 0 | 3,600 | Form 4 |
| 21 | PALMER JESS BRIAN Chief Accounting Officer | 2021-01-04 16:00:29 | 2,653 411 | 3,064 | Form 4 |
| 22 | HOLIDAY EDITH E Director | 2020-05-22 16:05:51 | 2,827 0 | 2,827 | Form 4 |
| 23 | Hicks Weston M Director | 2025-05-23 19:10:50 | 2,746 0 | 2,746 | Form 4 |
| 24 | Harrison Giles E President | 2026-02-27 11:18:46 | 2,675 2 | 2,677 | Form 4 |
| 25 | Frinquelli Angelo Michael Director | 2017-11-22 10:07:55 | 1,641 1000 | 2,641 | Form 4 |
| 26 | Tolman Gary Charles Director | 2018-05-25 12:44:04 | 1,822 798 | 2,620 | Form 4 |
| 27 | CHOKEL CHARLES BERGEN CFO - White Mountains Re Group | 2008-06-27 13:08:23 | 1,873 451 | 2,324 | Form 4 |
| 28 | Papamichael Michael A Chief Financial Officer | 2026-02-27 11:17:59 | 1,972 12 | 1,984 | Form 4 |
| 29 | Tanner David Allen Director | 2026-03-05 10:21:50 | 1,879 0 | 1,879 | Form 4 |
| 30 | CHOKSI MARY C Director | 2025-05-23 19:09:43 | 1,858 0 | 1,858 | Form 4 |
| 31 | Gelston Philip A Director | 2025-12-16 20:41:57 | 1,568 0 | 1,568 | Form 4 |
| 32 | CAVOORES JOHN PAUL Pres & CEO, OneBeacon | 2004-04-30 08:48:33 | 1,450 15 | 1,465 | Form 4 |
| 33 | GILLESPIE GEORGE JOSEPH III Director | 2010-07-16 14:27:17 | 1,400 0 | 1,400 | Form 4 |
| 34 | CLARK HOWARD LONGSTRETH JR Director | 2013-05-28 14:26:26 | 1,374 0 | 1,374 | Form 4 |
| 35 | SMITH LOWNDES ANDREW Director | 2019-12-11 16:31:49 | 1,102 0 | 1,102 | Form 4 |
| 36 | Dillon Margaret Director | 2025-05-23 19:10:03 | 945 0 | 945 | Form 4 |
| 37 | SHANK SUZANNE F. Director | 2025-05-27 09:59:16 | 871 0 | 871 | Form 4 |
| 38 | Carlson Peter M Director | 2025-05-23 19:09:16 | 717 0 | 717 | Form 4 |
| 39 | LUSARDI ROBERT R EVP - White Mountains Capital | 2009-03-26 16:14:18 | 507 31 | 538 | Form 4 |
| 40 | Yi Steven Director | 2025-05-23 19:12:17 | 525 0 | 525 | Form 4 |
| 41 | BERKOWITZ BRUCE R former Director Director | 2010-04-28 14:40:42 | 300 0 | 300 | Form 4 |
| 42 | DORCUS MARK KEVIN Pres - WM Advisors | 2005-08-10 16:06:36 | 0 38 | 38 | Form 3 |
| 43 | MILLER T MICHAEL Pres & CEO - OneBeacon | 2005-07-08 16:04:23 | 0 0 | 0 | Form 3 |
| 44 | HUTTON TOM President, White Mountains Re | 2006-02-10 16:46:49 | 0 0 | 0 | Form 3 |
| 45 | BERKSHIRE HATHAWAY INC BUFFETT WARREN E GENERAL RE CORP GENERAL REINSURANCE CORP 10% Owner | 2008-11-03 15:02:16 | 0 0 | 0 | Form 13G |