WAVEMAN · COMPANY

WTM · White Mountains Insurance Group Ltd

LIVE

TEAM-0.32% 13F +439META+3.01% 13F +2,694RCG-2.04% CLUSTERUTHR-4.03% 13F +425CRWV+4.49% 13F +693CRM+2.92% 13F +1,018CVNA-0.98% 13F +794TPL-0.71% 13F +444NET+4.32% 13F +710MSTR+17.56% 13F +526DELL+4.91% 13F +1,203CRWD+5.68% 13F +1,382ANET+1.22% 13F +1,323COIN+10.14% 13F +475TEAM-0.32% 13F +439META+3.01% 13F +2,694RCG-2.04% CLUSTERUTHR-4.03% 13F +425CRWV+4.49% 13F +693CRM+2.92% 13F +1,018CVNA-0.98% 13F +794TPL-0.71% 13F +444NET+4.32% 13F +710MSTR+17.56% 13F +526DELL+4.91% 13F +1,203CRWD+5.68% 13F +1,382ANET+1.22% 13F +1,323COIN+10.14% 13F +475

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WTM

Name: WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) insider trading and ownership data
Creator: WaveMan
License: https://wave-man.com/terms

WHITE MOUNTAINS INSURANCE GROUP LTD

INSURANCE · FIRE, MARINE & CASUALTY INSURANCE · CIK 0000776867

SEC FILINGS☆ WATCH

INSIDER NET · 180D

open-market buys minus sells, Form 4 codes P and S

INSIDER BUYERS · 180D

CONGRESS BUYERS · 1Y

FUNDS ADDED · QTR

13F, latest reported quarter

REVENUE GROWTH

+66.8%

XBRL, annual

NET MARGIN

29.6%

SEVEN FACTS, RANKED AGAINST THE SECTOR · RANK IS NOT A FORECAST

INSIDERS

no Form 4 purchases or sales on file

CONGRESS

no member of Congress has reported trading it

FUNDS

fewer than five institutions report holding it

REVENUE

+66.8% year over year

more than 94% of Insurance

MARGIN

29.6% net margin

more than 85% of Insurance

BUYBACKS

$216.8M repurchased, FY to 2026-06-30

more than 57% of Insurance

SHORT

no short interest reported

The year, with the filings on it

Total return indexed to 100 over the last 12 months · every marker is a federal filing, placed at its date — hover any marker for the detail

TOTAL 12M RETURN +14.7%

+14.7%12M

INSIDER SELL

INDEXED RETURN, DIVIDEND-ADJUSTED — NOT A PRICE CHART · LARGE TRADES DRAWN FIRST WHEN A NAME FILES HEAVILY

Live price

Daily candles from TradingView, on their licence — no filings are marked on this one

WHY THIS NAME IS ON THE DESK

The complete filing record, in one place.

Every figure on this page is a federal filing, dated the day it became public — so you can test what was knowable, not what is known now.

Backtest this pattern Open the screener

Same sector, ranked by filing activity

Sector from the SEC's own SIC classification

GSHD DGICA PLMR ALHC CRVL HGTY KNSL TRV AFL MKL GL OSCR

Insider transactions

Form 4 purchases and sales (codes P and S) — grants, option exercises and preferred conversions excluded

No insider purchases or sales are on record for WHITE MOUNTAINS INSURANCE GROUP LTD in the period covered. Source: SEC Form 4 filings, as of 2026-09-05.

INSIDER

FILED

VALUE

CAMPBELL REID TARLTON

Director

SELL

2025-12-19

5,000.0

$10.2M

Rountree George Manning

Chief Executive Officer

SELL

2025-12-19

5,000.0

$10.2M

Gelston Philip A

Director

SELL

2025-12-16

165.0

$338.0K

Hicks Weston M

Director

BUY

2023-11-17

11.0

$16.3K

Hicks Weston M

Director

BUY

2023-11-17

238.0

$353.4K

17 TRANSACTIONS ON RECORD

Showing the most recent few. Create a free account to see 12 more transactions on record, the cross-source screener and CSV export. We store only your email address, and there is no password to create.

Institutional holders

13F · holdings as of the latest quarter funds have reported

no 13F holders found for this ticker

SCHEDULE 13D/G

No 5%+ ownership filings

Nobody has crossed 5% with a filing obligation. Absence is a fact here, not missing data.

FORM 144

No planned-sale notices

No insider has notified an intent to sell. This is the panel to watch after a run-up.

Executive pay vs shareholder return · Mr. Rountree

DEF 14A pay-versus-performance disclosure · both the headline pay and the SEC's mark-to-market figure, beside the return the company delivered and the return of the peer group it chose itself

CEO TOTAL

ACTUALLY PAID

OTHER NEOs AVG

TSR

PEER TSR

2023

$7.6M

$11.7M

$3.7M

+35%

+68%

2022

$7.2M

$23.1M

$3.2M

+27%

+52%

2021

$7.2M

$4.6M

$2.9M

-9%

+28%

2020

$7.2M

$13.8M

$4.0M

-10%

+7%

TAGGED BY THE COMPANY UNDER SEC ITEM 402(v) · RETURN IS CUMULATIVE FROM THE START OF THE DISCLOSURE PERIOD · GREEN WHERE THE COMPANY BEAT ITS OWN PEER GROUP

Fundamentals

Annual figures from XBRL filings · pick a past date to see them exactly as the market knew them then — restatements and all

	2025-12	2024-12	2023-12	2022-12
REVENUE	$3.7B	$2.2B	$2.2B	$1.2B
NET INCOME	$1.1B	$230.4M	$509.2M	$792.8M
EPS (DILUTED)	430.14	89.79	198.60	276.96
OPERATING CASH FLOW	$550.5M	$586.8M	$404.1M	$365.0M
LONG-TERM DEBT	$837.0M	$562.5M	$564.6M	$575.2M
BUYBACKS	$202.6M	$7.9M	$32.7M	$615.8M
DIVIDENDS PAID	$2.6M	$2.5M	$2.6M	$3.0M

SEC XBRL · FISCAL-YEAR PERIODS · AS KNOWN ON 2026-09-05 · NOBODY ELSE SHOWS FUNDAMENTALS AS OF A PAST DATE