WTMWhite Mountains Insurance Group Ltd.

CSNew York Stock Exchange (XNYS)·USD

Identity

Security key: 23779
Ticker: WTM
Type: CS — Common Stock
Exchange: New York Stock Exchange(XNYS)
Venue group: NYSE
Operating MIC: XNYS
Market: stocks
Locale: us
Currency: USD
Listed: 1985-10-23
Round lot: 10
Active: Yes
Last seen in a load: 2026-08-14 20:49
Vendor updated: 2026-08-13 06:09
Ticker root / suffix: WTM

Detail

Enriched 2026-08-14 20:47

Market cap: $5,058,559,690.66
Shares outstanding (class): 2,386,721
Shares outstanding (weighted): 2,386,721
SIC: 6331 FIRE, MARINE & CASUALTY INSURANCE
Employees: 1,648
Location: HANOVER, NH
Homepage: https://www.whitemountains.com
Description: White Mountains Insurance Group Ltd is engaged in the business of making opportunistic and value-oriented acquisitions of businesses and assets in the insurance, financial services, and related sectors, operating these businesses and assets through its subsidiaries and, if and when attractive exit valuations become available, disposing of these businesses and assets. The company conducts its business in five areas: property and casualty insurance and reinsurance, municipal bond reinsurance, capital solutions for asset and wealth management firms, property and casualty insurance distribution, and other operations. The company has four reportable segments: Ark/WM Outrigger, HG Global, Kudu and Distinguished.

Market cap and share counts drift.

Funds holding this security

136 funds · 139 positions · $1.22B reported value, as of 2026-03-31

All holders →

Fund	Ticker	Position value	% of fund	Balance	Match
Undiscovered Managers Behavioral Value Fund UNDISCOVERED MANAGERS FUNDS	—	$187.78M	2.17%	85,474 NS	TICKER
VANGUARD TOTAL STOCK MARKET INDEX FUND VANGUARD INDEX FUNDS	VTI	$168.92M	0.01%	76,890 NS	TICKER
VANGUARD SMALL-CAP INDEX FUND VANGUARD INDEX FUNDS	VB	$122.85M	0.07%	55,920 NS	TICKER
FMI Common Stock Fund FMI Funds Inc	—	$87.88M	5.01%	40,000 NS	TICKER
VANGUARD SMALL-CAP VALUE INDEX FUND VANGUARD INDEX FUNDS	VBR	$78.24M	0.13%	35,613 NS	TICKER
VANGUARD EXTENDED MARKET INDEX FUND VANGUARD INDEX FUNDS	VXF	$60.00M	0.07%	27,309 NS	TICKER
JNL Multi-Manager Small Cap Value Fund JNL Series Trust	—	$46.78M	2.78%	21,295 NS	TICKER
Longleaf Partners Small Cap Fund Longleaf Partners Funds Trust	—	$33.47M	4.81%	15,233 NS	TICKER
Allspring Special Small Cap Value Fund ALLSPRING FUNDS TRUST	—	$28.18M	0.90%	12,827 NS	TICKER
T. Rowe Price Small-Cap Stock Fund, Inc. T. ROWE PRICE SMALL-CAP STOCK FUND, INC.	—	$26.31M	0.33%	11,974 NS	TICKER
LORD ABBETT MID CAP STOCK FUND INC LORD ABBETT MID CAP STOCK FUND INC	—	$26.28M	2.42%	11,963 NS	TICKER
Carillon Scout Mid Cap Fund Carillon Series Trust	—	$26.08M	0.70%	11,873 NS	TICKER
iShares Russell Mid-Cap ETF iShares Trust	IWR	$20.92M	0.04%	9,520 NS	TICKER
T. Rowe Price Small-Cap Value Fund, Inc. T. ROWE PRICE SMALL-CAP VALUE FUND, INC.	—	$18.22M	0.20%	8,292 NS	TICKER
Brown Advisory Small-Cap Fundamental Value Fund Brown Advisory Funds	—	$17.73M	1.65%	8,072 NS	TICKER

How positions resolve to the securities master. FIGI_COMPOSITE is exact identifier equality — both sides got the FIGI from Bloomberg. TICKER is a narrow fallback used only where the master row carries no FIGI at all (2,389 rows do not, disproportionately Irish-domiciled US listings like LIN and ACN). Roughly 22% of all positions resolve to the master.

This match is a candidate, not a mapping. N-PORT tickers are filer-entered free text and collide with delisted and foreign symbols. Only 13% of positions carry a ticker at all. Good enough to ask which funds report holding a symbol; not good enough to build exposure reporting on. Prefer the ISIN-resolved link, which is marked FIGI_COMPOSITE.

Funds holding this security

Identifiers

master.security_identifier

TICKERWTM
CIK0000776867
ISINBMG9618E1075
Resolved through OpenFIGI from a holdings ISIN, not supplied by the securities vendor.

Identifiers

Classification

classification.v_security_classification

Asset class: Equity
Sector: Financials
Industry: Insurance
Source: LLMunreviewed
Self-reported confidence: 0.95
Model: deepseek
Rationale: White Mountains is a property and casualty insurance holding company, classified under financials and insurance.

Classifications are unreviewed model output. All 5,771 assignments carry source = LLM and is_reviewed = false. Confidence is the model’s own estimate and is not calibrated — it clustered at 0.90–0.98 across the whole first pass, including rows that later proved wrong. Use it to order a review queue, not as a probability. Two share classes of one issuer can disagree.

Classification

Fund data

Not linked to a fund series.

Either this is not a fund, or it is one the SEC share-class snapshot cannot reach — commodity trusts and notes have no series ID at all.