WHITE MOUNTAINS INSURANCE GROUP LTD Net Worth - Insider Trades and Bio as of Jul 14, 2026

MAXMediaAlpha, Inc.SEC CIK: 0000776867

Estimated Net Worth

Last Updated: May 18, 2026 08:18 PM EST

Transaction Summary

Total Transactions19

Buy-Sell Ratio0.29

Buy Transactions2

Sell Transactions7

Transaction Volume

Total Volume-$1.14B

Net Volume$1.37B

Buy Volume$113.27M

Sell Volume-$1.26B

Trade Analysis

AVG Trade Size-$163.07M

Largest Trade$59.17M

Most Active MonthMar

Most Active Year2006

Trading Sentiment

OverallBullish

Recent TradeSelling

Last 90 Days0 Trades

ConvictionNone

Net Worth & Trading Activity Over Time

Monthly Trading Pattern

Past Insider Trading and Trends

WHITE MOUNTAINS INSURANCE GROUP LTD does not have any significant net worth to report based on the numbers we have. This is based on reported shares across multiple companies, which include MediaAlpha, Inc., Symetra Financial CORP, OneBeacon Insurance Group, Ltd., and MONTPELIER RE HOLDINGS LTD.

Holdings & Transactions

MAXmediaalpha, inc.

Updated: May 09, 2024VIEW QUOTE

Form Type	Δ Own, %	Traded Shares	Price	Size, $	Filing Date	Own, %	Type	Scheduled	Trade Dates	SEC Filing
From 4	-0.22	5.00M	$19.00	-$95.00M	May 09, 2024	17.86M	Sale	—	May 07	View
From 4	0.35	5.92M	$10.00	$59.17M	Jun 30, 2023	22.86M	Purchase	—	Jun 30	View
From 4	-0.17	3.59M	$46.00	-$165.24M	Mar 25, 2021	16.94M	Sale	—	Mar 23	View
From 4	-0.15	3.61M	$19.00	-$68.59M	Nov 03, 2020	20.53M	Sale	—	Oct 30	View
From 3	—	—	—	—	Oct 28, 2020	24.14M	—	—	—	View

onebeacon insurance group, ltd.

Updated: Sep 28, 2017

Form Type	Δ Own, %	Traded Shares	Price	Size, $	Filing Date	Own, %	Type	Scheduled	Trade Dates	SEC Filing
From 4	-1.00	71.75M	$18.10	-$1.30B	Sep 28, 2017	—	Disposition	—	Sep 28	View
From 4	-0.01	645.26K	$25.85	-$16.68M	Mar 15, 2007	71.75M	Sale	—	Mar 15	View
From 4	-0.28	27.60M	$23.56	-$650.32M	Nov 14, 2006	72.40M	Sale	—	Nov 14	View
From 3	—	—	—	—	Nov 06, 2006	100.00M	—	—	—	View

symetra financial corp

Updated: Feb 02, 2016

Form Type	Δ Own, %	Traded Shares	Price	Size, $	Filing Date	Own, %	Type	Scheduled	Trade Dates	SEC Filing
From 4	-1.00	20.56M	$32.00	-$658.00M	Feb 02, 2016	—	Disposition	—	Feb 01	View
From 4	0.03	513.50K	—	—	Jul 02, 2015	20.56M	Acquisition	—	Jun 30	View
From 4	-0.25	6.84M	$13.51	$6.46	Jun 24, 2013	20.05M	Options	—	Jun 20	View
From 3/A	—	—	—	—	Jan 22, 2010	17.40M	—	—	—	View
From 3	—	—	—	—	Jan 21, 2010	17.40M	—	—	—	View

montpelier re holdings ltd

Updated: Sep 27, 2006

Form Type	Δ Own, %	Traded Shares	Price	Size, $	Filing Date	Own, %	Type	Scheduled	Trade Dates	SEC Filing
From 4	-0.85	5.37M	$19.40	-$104.18M	Sep 27, 2006	8.11M	Sale	—	Sep 27	View
From 4	0.50	3.06K	$41.78	$127.97K	Mar 08, 2005	13.48M	Acquisition	—	Mar 08	View
From 4	—	6.13K	$36.82	$225.56K	Nov 03, 2004	13.48M	Acq/Dis	—	Nov 02	View
From 4	-0.56	4.50M	$34.50	-$155.25M	Mar 12, 2004	13.47M	Sale	—	Mar 12	View
From 4	0.50	2.39M	$22.63	$54.10M	Mar 10, 2004	17.97M	Purchase	—	Mar 08	View

Benzinga

Benzinga

Net Worth & Trading Activity Over Time

Monthly Trading Pattern

Past Insider Trading and Trends

Holdings & Transactions