Security key
G9618E107
WHITE MOUNTAINS INSURANCE GROUP LTD - COMMON (WTM)
CUSIP: G9618E107
Q1 2023 13F Holders as of 31 Mar 2023
- Security type / class
- Equity / COMMON
- Total 13F shares
- 2,244,965
- Total 13F value
- $3,093,422,937
- Share change
- -8,312
- SEC-reported price per share
- $1377.49
- Number of holders
- 261
- Value change
- -$11,530,148
- Number of buys
- 95
- Number of sells
- 109
- Shares outstanding
- 2,397,635
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2023
Institutions
261
Top holders
10
WTM full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q3 2025
WHITE MOUNTAINS INSURANCE GROUP LTD SEC filings
WHITE MOUNTAINS INSURANCE GROUP LTD company facts
WHITE MOUNTAINS INSURANCE GROUP LTD 13D/G history
Broader feeds
Reporting periods
Holder history for CUSIP G9618E107
Recent filing periods:
Ownership snapshot
Top reported holders of WTM - WHITE MOUNTAINS INSURANCE GROUP LTD - COMMON (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
VANGUARD GROUP INC
Disclosed value leader
VANGUARD GROUP INC
Comparable rows
0/15
Latest evidence
31 Dec 2022
13F
Highest disclosed value: $359,128,087
15 rows are not safely comparable across share classes.
Showing 1-6 of 15 holder rows.
Quick read
VANGUARD GROUP INC has the largest disclosed position value at $359.13M.
0 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens VANGUARD GROUP INC's linked filing trail.
Disclosed position value
Top 5
VANGUARD GROUP INC
$359.13M
MORGAN STANLEY
$268.26M
DIMENSIONAL FUND ADVISORS LP
$226.4M
FULLER & THALER ASSET MANAGEMENT,...
$216.77M
River Road Asset Management, LLC
$197.19M
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| VANGUARD GROUP INC |
13F
Company
|
—
denominator unverified
|
$359,128,087
253,921 shares
|
— | 31 Dec 2022 |
| MORGAN STANLEY |
13F
Company
|
—
denominator unverified
|
$268,257,403
189,671 shares
|
— | 31 Dec 2022 |
| DIMENSIONAL FUND ADVISORS LP |
13F
Company
|
—
denominator unverified
|
$226,403,000
160,079 shares
|
— | 31 Dec 2022 |
| FULLER & THALER ASSET MANAGEMENT, INC. |
13F
Company
|
—
denominator unverified
|
$216,774,000
153,270 shares
|
— | 31 Dec 2022 |
| River Road Asset Management, LLC |
13F
Company
|
—
denominator unverified
|
$197,190,132
139,423 shares
|
— | 31 Dec 2022 |
| Boston Partners |
13F
Company
|
—
denominator unverified
|
$176,547,331
124,320 shares
|
— | 31 Dec 2022 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2023
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
261
Shares
2,244,965
Rows available
261
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2023 vs Q4 2025 Across Filers
Q4 2025 holders
353
Q1 2023 holders
261
Holder diff
-92
| Investor | Q4 2025 Shares | Q1 2023 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2023 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend