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MediaAlpha holder sells 5.5M shares at $13.90

After the transaction, the reporting persons reported approximately 24.27% beneficial ownership of Class A shares, with a 30-day transfer restriction subject to certain exceptions.

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Form Type
SCHEDULE 13D/A

Rhea-AI Filing Summary

MediaAlpha, Inc. (MAX) stockholder WM Hinson (Bermuda) Ltd. sold 5,500,391 Class A shares to J.P. Morgan Securities LLC on November 4, 2026, under Rule 144, at $13.90 per share. The stated purpose was to monetize part of the reporting persons’ ownership interest.

After the sale, White Mountains Insurance Group, Ltd. and WM Hinson reported beneficial ownership of 12,356,223 Class A shares, approximately 24.27% of the 50,903,805 Class A shares outstanding as of October 26, 2026. White Mountains directly held 900,000 shares, and WM Hinson directly held 11,456,223. Each reporting person is subject to a 30-day lock-up with J.P. Morgan Securities LLC restricting transfers, subject to certain exceptions.

Class A shares sold 5,500,391 shares WM Hinson sale on November 4, 2026
Sale price $13.90 per share Sale to J.P. Morgan Securities LLC
Combined beneficial ownership 12,356,223 Class A shares Reported after the sale by White Mountains and WM Hinson
Beneficial ownership percentage Approximately 24.27% Reporting persons’ Class A shares after the sale
Class A shares outstanding 50,903,805 shares As of October 26, 2026
WM Hinson directly held shares 11,456,223 Class A shares Reported as of the date of the amendment
Transfer lock-up 30 days Applies to each reporting person, subject to certain exceptions
Rule 144 regulatory
"sold ... pursuant to Rule 144"
Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.
beneficial ownership regulatory
"The Class A Shares held by the Reporting Persons represent approximately 24.27%"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
Class A Shares Outstanding financial
"based on 50,903,805 Class A Shares outstanding as of October 26, 2026"
lock-up financial
"subject to a 30-day lock-up with J.P. Morgan Securities LLC"
A lock-up is an agreement that prevents company insiders, early investors or employees from selling their shares for a set period after a public share offering. It matters to investors because it temporarily limits the number of shares available to trade—like a scheduled hold on extra inventory—and when that hold ends a large number of shares can enter the market, potentially putting downward pressure on the stock price and revealing insiders’ confidence in the company.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many MAX shares did WM Hinson sell, and at what price?

WM Hinson (Bermuda) Ltd. sold 5,500,391 Class A shares on November 4, 2026, to J.P. Morgan Securities LLC at $13.90 per share under Rule 144. The stated purpose was to monetize part of the reporting persons’ ownership interest.

How much of MAX did the reporting persons own after the sale?

White Mountains Insurance Group, Ltd. and WM Hinson reported beneficial ownership of 12,356,223 Class A shares, approximately 24.27% of the 50,903,805 Class A shares outstanding as of October 26, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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58450V104

(CUSIP Number)
Robert L. Seelig, Esq.
23 South Main Street, Suite 3B,
Hanover, NH, 03755
(603) 640-2200

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)
11/04/2026

(Date of Event Which Requires Filing of This Statement)


If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).




schemaVersion:


SCHEDULE 13D






SCHEDULE 13D






SCHEDULE 13D


White Mountains Insurance Group, Ltd.
Signature:/s/ Robert L. Seelig
Name/Title:Robert L. Seelig - Executive Vice President and General Counsel
Date:11/05/2026
WM Hinson (Bermuda) Ltd.
Signature:/s/ John G. Sinkus
Name/Title:John G. Sinkus - Vice President
Date:11/05/2026

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