WHITE MTNS INS GROUP LTD

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WTM·G9618E107·US·Common Stock·Financial Services - Insurance - Property & Casualty-13D/G

WTM institutional ownership changes in Q2 2026: 68 institutions opened or added positions, 102 trimmed or exited. WTM (WHITE MTNS INS GROUP LTD) is held by 169 institutional investors as of Q2 2026. Top institutional shareholders: DIMENSIONAL FUND ADVISORS LP ($329.6M), Neuberger Berman Group LLC ($247M), BlackRock, Inc. ($244.4M). Net institutional sentiment: Mixed.

169

Holders

(17 Elite)

$3.7B

Total Value

40% (170)

Consensus

68 buying - 102 selling

13F: Jun 30, 2026Insider & Congress: Updated regularly

Smart Money Verdict

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Institutional (13F)37

Insider (Form 4)57

Activist (13D/13G)64

Congressional (STOCK Act)62

Holder Quality

41

★★★★★

Elite

53

★★★★

Strong

49

★★★

Solid

87

★★

Below

22

★

Weak

Held by 169 funds

17 elite

Who's Trading

Source dates: Price Oct 21, 2026 · Insiders none · Activists May 7, 2026 · Congress none

ActivistNeuberger Berman Group LLC4.9%May 7, 2026

ActivistVAVanguard Capital Management5.2%Apr 30, 2026

ActivistThe Vanguard Group0.0%Mar 27, 2026

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Top Holders

Top Holders (169)History

AllNewIncreasedHeldDecreasedExitedFirst report

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Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
DIMENSIONAL FUND ADVISORS LP	Increased	158,954(+1.5%)	$329.6M	0.1%	+95.58%	31
Neuberger Berman Group LLC	Decreased	119,141(-4.5%)	$247M	0.2%	+19.82%	0
BlackRock, Inc.	Increased	117,871(+4.0%)	$244.4M	0.0%	+25.23%	32
River Road Asset Management, LLC	Decreased	115,880(-3.9%)	$240.3M	2.7%	+105.73%	0
VPVANGUARD PORTFOLIO MANAGEMENT LLC	Decreased	111,969(-3.1%)	$232.2M	0.0%	-2.47%	0
VAVANGUARD CAPITAL MANAGEMENT LLC	Decreased	107,479(-1.5%)	$222.8M	0.0%	-2.47%	0
FULLER & THALER ASSET MANAGEMENT, INC.	Decreased	101,892(-2.5%)	$211.3M	0.6%	+99.12%	0
COOKE & BIELER LP	Decreased	85,120(-18.8%)	$176.5M	2.0%	+18.60%	0
FIDUCIARY MANAGEMENT INC /WI/	Decreased	66,550(-21.8%)	$138M	2.0%	+47.12%	0
Boston Partners	Decreased	55,569(-3.3%)	$115.3M	0.1%	+134.29%	0
LONDON CO OF VIRGINIA	Decreased	54,025(-5.4%)	$112.1M	0.6%	+112.46%	0
STATE STREET CORP	Increased	50,257(+2.2%)	$104.2M	0.0%	+75.94%	31
GEODE CAPITAL MANAGEMENT, LLC	Increased	49,412(+17.3%)	$102.5M	0.0%	+77.49%	35
MORGAN STANLEY	Decreased	46,866(-21.0%)	$97.2M	0.0%	+18.93%	0
AMERICAN CENTURY COMPANIES INC	Increased	31,108(+274.4%)	$64.5M	0.0%	+3.24%	48
BANK OF AMERICA CORP /DE/	Decreased	25,028(-11.7%)	$51.9M	0.0%	+50.69%	0
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	Decreased	23,505(-3.0%)	$48.7M	0.0%	+111.24%	0
Allspring Global Investments Holdings, LLC	Decreased	18,116(-2.7%)	$37.4M	0.1%	+29.44%	0
GAGotham Asset Management, LLC	Increased	17,940(+98.3%)	$37.2M	0.1%	+10.83%	47
BROWN ADVISORY INC	Decreased	17,722(-0.7%)	$36.7M	0.1%	+46.73%	0

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High Conviction Moves-Smart Money Convergence-Fund Consensus-Double-Down Detection

Data sourced from four public-disclosure sources: SEC 13F, Form 4, 13D/13G, and House/Senate STOCK Act disclosures. Not financial advice. Full disclaimer