Key facts
- This page summarizes Peter M. Carlson's Form 4 filing for WHITE MOUNTAINS INSURANCE GROUP LTD (WTM).
- 1 reported transaction and 0 derivative rows are listed below.
- Accepted by SEC: 22 May 2026, 10:31.
Peter M. Carlson - 21 May 2026 Form 4 Insider Report for WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)
- Reporting relationship
- Director
- Issuer ticker
- WTM
- Reported as of
- 21 May 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 22 May 2026, 10:31:46 UTC
- Prior SEC filing
- 20 Jun 2025
- Next SEC filing
- 22 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- Wesley C. Bell, by Power of Attorney
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Peter M. Carlson filed Form 4 for WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) on 22 May 2026.
Change
- Previous filing in this sequence was filed on 20 Jun 2025.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001379320
Primary reporting owner
Carlson Peter M
- Relationship
- Director
- Address
- C/O WHITE MOUNTAINS INSURANCE GROUP, LTD, 23 SOUTH MAIN STREET, SUITE 3B, HANOVER
- Signature
- Wesley C. Bell, by Power of Attorney
- Signature date
- 21 May 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
WTM
transaction
Common Shares
Award
- Transaction value
- Shares
- +135
- Change %
- +19%
- Price
- $0.000000*
- Shares after
- 852
- Date
- 21 May 2026
- Ownership
- Direct
- Footnotes
- F1
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 1 footnote
Footnote F1
Annual Director Share Award