{"transactions":[{"id":1522591,"issuer":{"id":1093,"kind":"organization","name":"MediaAlpha, Inc.","symbol":"MAX"},"owners":[{"id":3904,"kind":"organization","name":"WHITE MOUNTAINS INSURANCE GROUP LTD","position":1,"cik":"0000776867","reported_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":91303,"kind":"organization","name":"WM Hinson (Bermuda) Ltd.","position":2,"cik":"0001979065","reported_name":"WM Hinson (Bermuda) Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2024-05-09T21:04:25.000Z","date":"2024-05-07","kind":"sale","planned":false,"acquired":false,"shares":5000200,"price":19,"value":95003800.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"On May 7, 2024, WM Hinson (Bermuda) Ltd. sold 5,000,200 shares of Class A common stock of MediaAlpha, Inc. as a selling stockholder in an underwritten public secondary offering at a price to the public of $19.00 per share. 652,200 of such shares of Class A common stock were sold pursuant to the option granted to the underwriters by the selling stockholders, which was exercised in full prior to the closing."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Includes 900,000 shares of Class A common stock owned directly by White Mountains Insurance Group, Ltd. and 16,956,614 shares of Class A common stock owned directly by WM Hinson (Bermuda) Ltd., a wholly owned subsidiary of White Mountains Insurance Group, Ltd. White Mountains Insurance Group, Ltd. has indirect pecuniary interest in the securities held by WM Hinson (Bermuda) Ltd. Consequently, White Mountains Insurance Group, Ltd. is deemed to beneficially own the securities held directly by WM Hinson (Bermuda) Ltd. The board of directors and senior officers of White Mountains Insurance Group, Ltd. disclaim beneficial ownership with respect to such securities."}],"balance_after":17856614,"source":{"system":"sec-edgar","filing":"0001062993-24-009800","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/776867/000106299324009800/form4.xml","form_type":"4"}},{"id":1841588,"issuer":{"id":1093,"kind":"organization","name":"MediaAlpha, Inc.","symbol":"MAX"},"owners":[{"id":3904,"kind":"organization","name":"WHITE MOUNTAINS INSURANCE GROUP LTD","position":1,"cik":"0000776867","reported_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":91303,"kind":"organization","name":"WM Hinson (Bermuda) Ltd.","position":2,"cik":"0001979065","reported_name":"WM Hinson (Bermuda) Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2023-06-30T12:13:48.000Z","date":"2023-06-30","kind":"purchase","planned":false,"acquired":true,"shares":5916816,"price":10,"value":59168160.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On June 30, 2023, White Mountains Insurance Group, Ltd. (\"WMIG\"), through its wholly-owned, direct subsidiary, WM Hinson (Bermuda) Ltd. (\"WM Hinson\"), accepted for purchase shares of the class A common stock of MediaAlpha, Inc. (\"Shares\") through a fixed-price tender offer."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"WMIG owns 900,000 Shares directly and owns 21,956,814 Shares indirectly.  Of the Shares owned indirectly by WMIG, 5,916,816 Shares are owned directly by WMIG's direct subsidiary, WM Hinson, and 16,039,998 Shares are held directly by White Mountains Investments (Luxembourg) S.a' r.l., a direct subsidiary of WM Birkdale, Ltd., a direct subsidiary of WMIG."}],"balance_after":22856814,"source":{"system":"sec-edgar","filing":"0001062993-23-014208","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/776867/000106299323014208/form4.xml","form_type":"4"}},{"id":2772520,"issuer":{"id":1093,"kind":"organization","name":"MediaAlpha, Inc.","symbol":"MAX"},"owners":[{"id":3904,"kind":"organization","name":"WHITE MOUNTAINS INSURANCE GROUP LTD","position":1,"cik":"0000776867","reported_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2021-03-25T12:52:06.000Z","date":"2021-03-23","kind":"sale","acquired":false,"shares":3592204,"price":46,"value":165241384.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"On March 23, 2021, White Mountains Investments (Luxembourg) S.a` r.l. sold 3,592,204 shares of Class A common stock of MediaAlpha, Inc. as a selling stockholder in an underwritten public secondary offering at a price to the public of $46.00 per share. 469,744 of such shares of Class A common stock were sold pursuant to the option granted to the underwriters by the selling stockholders, which was exercised in full prior to the closing."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Includes 900,000 shares of Class A common stock owned directly by Bridge Holdings (Bermuda) Ltd. and 16,039,998 shares of Class A common stock owned directly by White Mountains Investments (Luxembourg) S.a` r.l.  Bridge Holdings (Bermuda) Ltd. and White Mountains Investments (Luxembourg) S.a` r.l. are each wholly owned subsidiaries of White Mountains Insurance Group, Ltd. White Mountains Insurance Group, Ltd. has indirect pecuniary interest in the securities held by Bridge Holdings (Bermuda) Ltd. and by White Mountains Investments (Luxembourg) S.a` r.l. Consequently, White Mountains Insurance Group, Ltd. is deemed to beneficially own the securities held directly by Bridge Holdings (Bermuda) Ltd. and White Mountains Investments (Luxembourg) S.a` r.l. The board of directors and senior officers of White Mountains Insurance Group, Ltd. disclaim beneficial ownership with respect to such securities."}],"balance_after":16939998,"source":{"system":"sec-edgar","filing":"0001668244-21-000013","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/776867/000166824421000013/edgar.xml","form_type":"4"}},{"id":2995807,"issuer":{"id":1093,"kind":"organization","name":"MediaAlpha, Inc.","symbol":"MAX"},"owners":[{"id":3904,"kind":"organization","name":"WHITE MOUNTAINS INSURANCE GROUP LTD","position":1,"cik":"0000776867","reported_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"CLASS A COMMON STOCK","published_at":"2020-11-03T21:41:55.000Z","date":"2020-10-30","kind":"sale","acquired":false,"shares":3609894,"price":19,"value":68587986.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"On October 27, 2020, MediaAlpha, Inc. (the \"Issuer\") closed its initial public offering (the \"IPO\") of its shares of Class A common stock, par value $0.01 per share (the \"Class A Common Stock\").  In addition to the stock sold by the Issuer in the IPO, White Mountains Investments (Luxembourg) S.a r.l. sold 3,609,894 shares of Class A Common Stock as the selling stockholder at a price of $19.00 per share, which included 618,396 shares of Class A common stock sold pursuant to the option granted to the underwriters by the selling stockholder, which was exercised in full prior to the closing."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Includes 20,532,202 share of Class A Common Stock owned directly by White Mountains Investments (Luxembourg) S.a r.l.  White Mountains Investments (Luxembourg) S.a r.l. is a wholly owned indirect subsidiary of White Mountains Insurance Group, Ltd.  White Mountains Insurance Group, Ltd. has indirect pecuniary interest in the securities held by White Mountains Investments (Luxembourg) S.a r.l.  Consequently, White Mountains Insurance Group, Ltd. is deemed to beneficially own the securities held directly by White Mountains Investments (Luxembourg) S.a r.l.  The board of directors and senior officers of White Mountains Insurance Group, Ltd. disclaim beneficial ownership with respect to such securities."}],"balance_after":20532202,"source":{"system":"sec-edgar","filing":"0000899243-20-030233","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/776867/000089924320030233/doc4.xml","form_type":"4"}},{"id":4200447,"issuer":{"id":107326,"kind":"organization","name":"OneBeacon Insurance Group, Ltd.","symbol":"OB"},"owners":[{"id":3904,"kind":"organization","name":"WHITE MOUNTAINS INSURANCE GROUP LTD","position":1,"cik":"0000776867","reported_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","relationship":{"ten_percent_owner":true}}],"security":"Class B Common Shares","published_at":"2017-09-28T21:08:23.000Z","date":"2017-09-28","kind":"disposition_to_issuer","acquired":false,"shares":71754738,"price":18.1,"value":1298760757.8,"ownership":{"direct":false,"nature":"By subsidiaries"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Disposition in connection with the merger between Intact Acquisition Co. Ltd. and OneBeacon Insurance Group, Ltd. (\"OneBeacon\") in which each outstanding Class B common share of OneBeacon was converted into the right to receive an amount in cash equal to $18.10 per share."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares owned by indirect wholly owned subsidiaries of White Mountains Insurance Group, Ltd."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000950157-17-001371","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/776867/000095015717001371/form4.xml","form_type":"4"}}]}