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MAX SCHEDULE 13D/A: SEC filing

White Mountains Insurance Group and WM Hinson (Bermuda)

Filed with the SEC on · accession 0000950157-26-001142

MAX filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Oct 30, 2026. White Mountains Insurance Group and WM Hinson (Bermuda) filed an amendment to their Schedule 13D regarding MediaAlpha, Inc., updating Annex A with information about their executive officers and directors. The stock moved +4.4% by the first close after the filing.

Summary of the filing

White Mountains Insurance Group and WM Hinson (Bermuda) filed an amendment to their Schedule 13D regarding MediaAlpha, Inc., updating Annex A with information about their executive officers and directors. No change in ownership or intent was disclosed.

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Key details

Reporting personWhite Mountains Insurance Group, Ltd.
Reporting personWM Hinson (Bermuda) Ltd.
Subject companyMediaAlpha, Inc.
Ceo and director of white mountainsLiam P. Caffrey
Cfo of white mountainsMichael Papamichael
President and director of wm hinsonKevin Pearson

How MAX stock reacted

Close before

$14.13

Oct 29, 2026

First close after

+4.39%

$14.75

5 trading days

+2.26%

$14.45

Since filing

+2.26%

$14.45

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Frequently asked questions

What did MAX file with the SEC on Oct 30, 2026?

MAX filed a SCHEDULE 13D/A (SEC filing). White Mountains Insurance Group and WM Hinson (Bermuda) filed an amendment to their Schedule 13D regarding MediaAlpha, Inc., updating Annex A with information about their executive officers and directors. No change in ownership or intent was disclosed.

How do I read a SCHEDULE 13D/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13D/A (schedule 13d/a): A report the company filed with the SEC (the US market regulator).

How did MAX stock react to this filing?

MAX closed at $14.13 before the filing and $14.75 on Oct 30, 2026 (+4.39%). Five trading days later: $14.45 (+2.26%).

Other MAX SEC filings

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