WTM

White Mountains Insurance GP$2,098 0.99%
FinancialsUSCUSIP G9618E107· EOD Jul 31, 2026◍ Confluence graph
Tracked 13F Holders
299
-211 QoQ
13F Value (tracked)
$4.5B
Insider Net · 180d
$0
0↑ 0↓
Recent Filings
15
Smart-money sentimentMixed
BearishBullish
13F funds (latest Q)29 adding · 22 trimming
Insider net (180d)$0

Price & smart-money activity

$2,098 0.99%5Y +84.8%
$898.34$1,277$1,656$2,035$2,41420212022202320242025202625252334223226352243830313629283929305393739393938403659365352585367533757381651934
Hover for who · click for detailEnd-of-day closing prices52w $1,651 – $2,319

Who owns WTM?

299 tracked 13F filers

299 tracked 13F filers disclose a position in WTM as of the latest SEC 13F filings, a combined $4.5B in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

All quarters use one ordinary-share-equivalent series. Historical ADS are converted at 2 ADS = 1 ordinary share. Expand a row for the exact calculation; the residual is not classified as a trade.
1 source-reported value row is withheld because the reported units do not agree with same-security peers. Share counts remain visible and unchanged.
#FundPosition valueSharesLast moveAs ofHistory
1DIMENSIONAL FUND ADVISORS LP
$344.1M
157K
~0%
Added · +14 sh
Q1 2026
2Neuberger Berman Group LLC
$274.0M
125K
−3.8%
Reduced · −5K sh
Q1 2026
3River Road Asset Management, LLC
$264.8M
121K
−0.3%
Reduced · −361 sh
Q1 2026
4VANGUARD PORTFOLIO MANAGEMENT LLC
$253.9M
116K
First observed position
No prior filed position
Q1 2026
5BlackRock, Inc.
$249.0M
113K
+0.9%
Added · +1K sh
Q1 2026
6VANGUARD CAPITAL MANAGEMENT LLC
$239.8M
109K
First observed position
No prior filed position
Q1 2026
7COOKE & BIELER LP
$230.4M
105K
−1.6%
Reduced · −2K sh
Q1 2026
8FULLER & THALER ASSET MANAGEMENT, INC.
$229.7M
105K
−3.3%
Reduced · −4K sh
Q1 2026
9FIDUCIARY MANAGEMENT INC /WI/
$186.9M
85K
−5.8%
Reduced · −5K sh
Q1 2026
10Wallace Capital Management Inc.
$173.1M
79K
−1.9%
Reduced · −2K sh
Q1 2026
11MORGAN STANLEY
$130.3M
59K
−28%
Reduced · −23K sh
Q1 2026
12Boston Partners
$126.2M
57K
−25%
Reduced · −19K sh
Q1 2026
13LONDON CO OF VIRGINIA
$125.5M
57K
−2.7%
Reduced · −2K sh
Q1 2026
14STATE STREET CORP
$108.0M
49K
−3.0%
Reduced · −2K sh
Q1 2026
15GEODE CAPITAL MANAGEMENT, LLC
$92.6M
42K
+1.4%
Added · +601 sh
Q1 2026
16T. Rowe Price Investment Management, Inc.
Withheld
42K
−6.8%
Reduced · −3K sh
Q1 2026
17GENDELL JEFFREY L
$83.1M
38K
+16%
Added · +5K sh
Q1 2026
18REINHART PARTNERS, LLC.
$82.1M
37K
−15%
Reduced · −7K sh
Q1 2026
19NORGES BANK
$66.9M
32K
+5.5%
Added · +2K sh
Q4 2025
20BANK OF AMERICA CORP /DE/
$62.3M
28K
−1.6%
Reduced · −451 sh
Q1 2026
21Cannell & Spears LLC
$61.6M
28K
−0.3%
Reduced · −88 sh
Q1 2026
22CHARLES SCHWAB INVESTMENT MANAGEMENT INC
$53.3M
24K
+4.3%
Added · +1K sh
Q1 2026
23RAYMOND JAMES FINANCIAL INC
$52.6M
24K
−0.1%
Reduced · −18 sh
Q1 2026
24Mraz, Amerine & Associates, Inc.
$46.1M
22K
+0.2%
Added · +39 sh
Q2 2026
25SOUTHEASTERN ASSET MANAGEMENT INC/TN/
$41.4M
19K
−40%
Reduced · −13K sh
Q1 2026

Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

Is WTM being bought or sold by institutions?

Last quarter, 3 funds opened a new position in WTM and 26 added to an existing one, while 22 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).

Opened (NEW)
3
funds
Added
26
funds
Reduced
22
funds
Exited
0
funds

Funds that own WTM also own

CompanyCo-held byCombined value
MICROSOFT CORPMSFT157 funds$227.4B
APPLE INCAAPL155 funds$246.7B
ALPHABET INC-CL CGOOG154 funds$108.6B
ALPHABET INC-CL AGOOGL153 funds$131.7B
JPMORGAN CHASE & COJPM153 funds$53.3B
ELI LILLY & COLLY152 funds$65.0B
NVIDIA CORPNVDA151 funds$327.3B
AMAZON.COM INCAMZN151 funds$165.0B
CHEVRON CORPCVX150 funds$25.6B
VISA INC-CLASS A SHARESV149 funds$51.2B
JOHNSON & JOHNSONJNJ149 funds$39.8B
BANK OF AMERICA CORPBAC149 funds$27.1B

Ranked by how many of WTM's institutional holders also hold each name, a cross-fund conviction signal.

Insider activity (Form 4)

Full insider page →
Buys · 180d
$0
0 insiders
Sells · 180d
$0
0 insiders
Net
$0
0 P/S txns
Signal
Mixed
open-market
DateInsiderRoleActionSharesValue
Dec 19, 2025Rountree George ManningChief Executive Officer, DirectorSell (S)5K$10.3M
Dec 19, 2025CAMPBELL REID TARLTONDirectorSell (S)5K$10.3M
Dec 16, 2025Gelston Philip ADirectorSell (S)165$338K
Nov 17, 2023Hicks Weston MDirectorBuy (P)11$16K
Nov 17, 2023Hicks Weston MDirectorBuy (P)238$353K
Nov 17, 2023Hicks Weston MDirectorBuy (P)120$177K
Nov 17, 2023Hicks Weston MDirectorBuy (P)52$77K
Nov 17, 2023Hicks Weston MDirectorBuy (P)579$857K
Dec 22, 2022Hildreth MichaelaMD & Chief Accounting OfficerSell (S)100$137K
Sep 20, 2022DAVIS MORGAN WDirectorSell (S)945$1.3M
Sep 20, 2022Carlson Peter MDirectorSell (S)200$280K
May 31, 2022Hildreth MichaelaMD & Chief Accounting OfficerSell (S)100$127K

Institutional ownership over time

89 funds-132 since Q3 2024
0150300Q3 2024Q1 2025Q3 2025Q1 2026Q2 2026
funds holding aggregate valuelatest $144.1M

Recent filings

15 shown

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Connected entities for WTM

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Ask your agent what changed in WTM

This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.

Copy-paste
curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://arkolith.com/api/v1/stocks/WTM/capital-change-brief"
Ask your agent
Use Arkolith's capital_change_brief for WTM.
Tell me what changed, whether insider activity
corroborates it, and cite the SEC evidence.

13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for WTM. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.