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No insider purchase over the last 90 days. The latest, by Hicks Weston M, was filed 20 Nov 2023.
White Mountains Insurance Group Ltd: what insiders have been doing
White Mountains Insurance Group Ltd, classified in the Banks sector, is a listed company. Its insiders report their share dealings to SEC (Form 4). Between 22 October 2025 and 22 October 2026, 14 insiders published 25 filings.
Only sales appear on the open market, 4 sales in all totalling €17.8M, filed by 3 insiders. The totals exclude 1 filing filed without an amount. One trade stands out by size: a sale of €8.7M from Rountree George Manning, disclosed on 22 December 2025.
Typically, a trade is published a median of 1 day after it takes place. For comparison, the SEC allows two business days to file a Form 4. Selling is not necessarily a view on the stock: liquidity needs and diversification are common motives.
With 25 filings in twelve months, the company is quieter than the median of 41 filings across the 2,023 companies we follow on the same exchange. The full history, which starts in 2016, counts 11 purchases against 78 sales. In its latest annual report filed with the SEC (10-K, fiscal year ended 31 December 2025), the company reported revenue of 3.73 bn USD and net income of 1.11 bn USD, with a dividend of 1.00 USD per share.
In the same sector, recent insider purchases at Dynex Capital Inc and Presurance Holdings, Inc. also feature in our signals. Every figure here comes from the filings published by SEC (Form 4) and describes the past, not future prices; it is not investment advice.
Insider Decl.
414
Thresholds
n/a
Buy Volume
€3M
11 ops. · all time
Sell Volume
€44M
78 ops. · all time
Who traded when
BuySaleReid Tarlton Campbell2 sales
George Manning Rountree1 sale
Philip A. Gelston1 sale
Since the insiders bought
- +31.1%Entry US$1,484.02 · Close at T+365 US$1,944.99
- +21.7%Entry US$949.94 · Close at T+365 US$1,156.06
- -2.0%Entry US$924.70 · Close at T+365 US$905.86
Entry is the close on the day after publication, the first price a reader could act on. Prices in the listing currency. Past moves are not a forecast.
This score ranks the purchase within its own market. A position size is suggested only on the venues of the backtested strategy universe; elsewhere, signals stay on watch. Not investment advice.
Fundamental score
Ranked 758 of 26,248 companies
82.2
score / 100
Value82
Quality82
FCF yld10%
Earn yld21%
EV/EBITDA8.2x
ROE20%
Gross mgn·
Net mgn38%
Debt/EBITDA1.1x
Pillars2/3
Transparent value + quality ranking, distinct from the insider signal.
Financial data
as of FY 2025FY ended December 2025 · cache
US$2,213.61
Analyst consensus
Income statement
RevenueUS$2.9B
EBITDAUS$748.6M26% margin
Net incomeUS$1.1B37.7% margin
Valuation
PER (trailing)5.1x
P/Book1.0x
Beta0.28
Balance sheet & cash
Market capUS$5.3B
Total debtUS$837M
Free Cash FlowUS$550.5M
Debt / Equity15%
Profitability & ownership
ROE20.4%
ROA3.5%
% insiders3.2%
% institutions96.3%
Last declaration on 31 August 2026
Declarations414 total
2 shares0Common SharesSEC:0000776867-26-000051:0
113 shares0Common SharesSEC:0000776867-26-000049:0
135 shares0Common SharesSEC:0000776867-26-000036:0
135 shares0Common SharesSEC:0000776867-26-000038:0
135 shares0Common SharesSEC:0000776867-26-000037:0
135 shares0Common SharesSEC:0000776867-26-000040:0
135 shares0Common SharesSEC:0000776867-26-000041:0
50 shares0Common SharesSEC:0000776867-26-000025:0
225 shares0Common SharesSEC:0000776867-26-000023:0
1,500 shares0Common Shares (Restricted)SEC:0000776867-26-000021:0
775 shares0Common Shares (restricted)SEC:0000776867-26-000020:0
500 shares0Common Shares (Restricted)SEC:0000776867-26-000018:0
600 shares0Common Shares (Restricted)SEC:0000776867-26-000019:0
775 shares0Common Shares (restricted)SEC:0000776867-26-000017:0
274 shares@ US$2,078.0323.3% of flowCommon SharesSEC:0000776867-26-000010:0
425 shares@ US$2,078.0348.9% of flowCommon SharesSEC:0000776867-26-000006:0
398 shares@ US$2,078.0326.6% of flowCommon SharesSEC:0000776867-26-000007:0
131 shares@ US$2,078.03100.0% of flowCommon SharesSEC:0000776867-26-000009:0
60 shares0Common SharesSEC:0000776867-25-000034:0
5,000 shares@ US$2,050.0059.6% of flowCommon SharesSEC:0000776867-25-000029:0
5,000 shares@ US$2,050.0076.9% of flowCommon SharesSEC:0000776867-25-000032:0
5,000 shares0Common SharesSEC:0000776867-25-000030:0
165 shares@ US$2,048.51100.0% of flowCommon SharesSEC:0000776867-25-000025:0
50 shares0Common SharesSEC:0000776867-25-000021:0
4 shares0Common SharesSEC:0001318960-25-000008:0
25 of 414 declarations
About White Mountains Insurance Group Ltd
White Mountains Insurance Group Ltd. (NYSE: WTM) is a Bermuda-based holding company with a US-centered economic footprint and a long-standing focus on insurance, reinsurance, and capital allocation. Although the company is legally domiciled in Bermuda, its market listing is on the NYSE and much of its business activity, investments, and operating-company partnerships are tied to the United States. White Mountains is best understood as an insurance-and-investment platform rather than a conventional single-line carrier. ([investor.whitemountains.com](https://investor.whitemountains.com/news-releases/news-release-details/white-mountains-reports-fourth-quarter-results-8?utm_source=openai))
The group’s roots go back several decades, when it was built as a specialty insurance capital vehicle combining underwriting expertise with disciplined investment management. Over time, White Mountains has evolved into a diversified holding company that seeks long-term value creation through a mix of insurance operations, strategic ownership stakes, and balance-sheet deployment. Its model emphasizes risk-adjusted returns, underwriting discipline, and flexibility in where and how capital is allocated. ([investor.whitemountains.com](https://investor.whitemountains.com/?utm_source=openai))
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On the operating side, White Mountains’ core insurance exposure comes through Ark/WM Outrigger, which writes specialty insurance and reinsurance business, including property-casualty lines with meaningful catastrophe exposure. The group also has HG Global, which is linked to BAM (Build America Mutual) and provides exposure to the financial guaranty / municipal insurance market. In addition, White Mountains has built and backed several other platform investments, including Kudu, which participates in cash-flow streams tied to asset managers; MediaAlpha, which is connected to insurance distribution and marketing; and Bamboo, an insurance distribution platform. In 2025 and 2026, the company also announced new capital deployments such as Enterprise Solutions and Bishop Street Underwriters, reinforcing its active investment posture. ([investor.whitemountains.com](https://investor.whitemountains.com/news-releases/news-release-details/white-mountains-reports-fourth-quarter-results-8?utm_source=openai))
Competitive positioning is driven less by scale and more by specialization, underwriting quality, and a willingness to back niche businesses where capital, technical expertise, and execution matter. This gives White Mountains a distinctive profile in the US insurance universe: it is not trying to be a broad mass-market insurer, but rather a selective owner of businesses and asset positions that can compound book value over time. In practical terms, the company competes on disciplined risk selection, balance-sheet strength, and its ability to support growth in specialized markets. ([investor.whitemountains.com](https://investor.whitemountains.com/news-releases/news-release-details/white-mountains-reports-fourth-quarter-results-8?utm_source=openai))
Recent developments have been constructive. In February 2026, White Mountains reported 2025 results with book value per share of $2,188 at December 31, 2025, up 25% for the full year, helped by the sale of Bamboo, solid operating-company results, and favorable investment returns. Management also highlighted record activity at BAM and strong premium growth at Ark. For investors, that combination underscores White Mountains’ identity as a niche insurance capital allocator listed on the NYSE in the United States, with value creation coming from both underwriting and strategic portfolio management. ([investor.whitemountains.com](https://investor.whitemountains.com/news-releases/news-release-details/white-mountains-reports-fourth-quarter-results-8?utm_source=openai))
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