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Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"exercise_price":11.494,"exercise_date":"2004-07-30","expiration_date":"2014-07-29","underlying":"Common Stock","underlying_shares":9487872},"source":{"system":"sec-edgar","filing":"0001181431-13-036496","document":"rrd384268.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/40799/000118143113036496/rrd384268.xml","form_type":"4"}},{"id":183209,"issuer":{"id":12429,"kind":"organization","name":"Symetra Financial CORP","symbol":"SYA"},"owners":[{"id":2792,"kind":"organization","name":"BERKSHIRE HATHAWAY INC","symbol":"BRK.A","position":1,"cik":"0001067983","reported_name":"BERKSHIRE HATHAWAY INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":12430,"kind":"organization","name":"GENERAL RE CORP","position":2,"cik":"0000317745","reported_name":"GENERAL RE CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":12431,"kind":"organization","name":"GENERAL REINSURANCE CORP","position":3,"cik":"0000040799","reported_name":"GENERAL REINSURANCE CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":10509,"kind":"person","name":"BUFFETT WARREN E","position":4,"cik":"0000315090","reported_name":"BUFFETT WARREN E","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2013-06-24T20:41:43.000Z","date":"2013-06-20","kind":"other","acquired":true,"shares":184036,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote (1)"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"In order to induce GRC to exercise the warrant as described in footnote 2, SYA has agreed to issue to GRC 184,036 additional shares of SYA common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"These securities are owned directly by General Reinsurance Corporation (\"GRC\"), which is a wholly owned subsidiary of General Re Corporation (\"Gen Re\"), which is a wholly owned subsidiary of Berkshire Hathaway Inc. 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Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein."}],"balance_after":20048879,"source":{"system":"sec-edgar","filing":"0001181431-13-036496","document":"rrd384268.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/40799/000118143113036496/rrd384268.xml","form_type":"4"}},{"id":183208,"issuer":{"id":12429,"kind":"organization","name":"Symetra Financial CORP","symbol":"SYA"},"owners":[{"id":2792,"kind":"organization","name":"BERKSHIRE HATHAWAY INC","symbol":"BRK.A","position":1,"cik":"0001067983","reported_name":"BERKSHIRE HATHAWAY INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":12430,"kind":"organization","name":"GENERAL RE CORP","position":2,"cik":"0000317745","reported_name":"GENERAL RE CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":12431,"kind":"organization","name":"GENERAL REINSURANCE CORP","position":3,"cik":"0000040799","reported_name":"GENERAL REINSURANCE CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":10509,"kind":"person","name":"BUFFETT WARREN E","position":4,"cik":"0000315090","reported_name":"BUFFETT WARREN E","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2013-06-24T20:41:43.000Z","date":"2013-06-20","kind":"other","acquired":false,"shares":7023029,"price":15.528,"value":109053594.312,"ownership":{"direct":false,"nature":"See footnote (1)"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"On June 20, 2013, GRC exercised its warrant to purchase 9,487,872 shares of SYA common stock for $11.494 per share and paid the exercise price on a cashless basis, resulting in SYA's withholding of 7,023,029 shares of SYA common stock in respect of the exercise price."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"These securities are owned directly by General Reinsurance Corporation (\"GRC\"), which is a wholly owned subsidiary of General Re Corporation (\"Gen Re\"), which is a wholly owned subsidiary of Berkshire Hathaway Inc. 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Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein."}],"balance_after":19864843,"source":{"system":"sec-edgar","filing":"0001181431-13-036496","document":"rrd384268.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/40799/000118143113036496/rrd384268.xml","form_type":"4"}},{"id":183207,"issuer":{"id":12429,"kind":"organization","name":"Symetra Financial CORP","symbol":"SYA"},"owners":[{"id":2792,"kind":"organization","name":"BERKSHIRE HATHAWAY INC","symbol":"BRK.A","position":1,"cik":"0001067983","reported_name":"BERKSHIRE HATHAWAY INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":12430,"kind":"organization","name":"GENERAL RE CORP","position":2,"cik":"0000317745","reported_name":"GENERAL RE CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":12431,"kind":"organization","name":"GENERAL REINSURANCE CORP","position":3,"cik":"0000040799","reported_name":"GENERAL REINSURANCE CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":10509,"kind":"person","name":"BUFFETT WARREN E","position":4,"cik":"0000315090","reported_name":"BUFFETT WARREN E","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2013-06-24T20:41:43.000Z","date":"2013-06-20","kind":"other","acquired":true,"shares":9487872,"price":11.494,"value":109053600.768,"ownership":{"direct":false,"nature":"See footnote (1)"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"These securities are owned directly by General Reinsurance Corporation (\"GRC\"), which is a wholly owned subsidiary of General Re Corporation (\"Gen Re\"), which is a wholly owned subsidiary of Berkshire Hathaway Inc. 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Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein."}],"balance_after":26887872,"source":{"system":"sec-edgar","filing":"0001181431-13-036496","document":"rrd384268.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/40799/000118143113036496/rrd384268.xml","form_type":"4"}},{"id":228528,"issuer":{"id":3904,"kind":"organization","name":"WHITE MOUNTAINS INSURANCE GROUP LTD"},"owners":[{"id":2792,"kind":"organization","name":"BERKSHIRE HATHAWAY INC","symbol":"BRK.A","position":1,"cik":"0001067983","reported_name":"BERKSHIRE HATHAWAY INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":10509,"kind":"person","name":"BUFFETT WARREN E","position":2,"cik":"0000315090","reported_name":"BUFFETT WARREN E","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":12430,"kind":"organization","name":"GENERAL RE CORP","position":3,"cik":"0000317745","reported_name":"GENERAL RE CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":12431,"kind":"organization","name":"GENERAL REINSURANCE CORP","position":4,"cik":"0000040799","reported_name":"GENERAL REINSURANCE CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Shares, $1.00 par value","published_at":"2008-11-03T14:48:09.000Z","date":"2008-10-31","kind":"sale","acquired":false,"shares":1634921,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On October 31, 2008, General Reinsurance Corporation exchanged 1,634,921 common shares of White Mountains Insurance Group, Ltd. 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Gen Re and Berkshire are indirect beneficial owners of the reported securities."}],"balance_after":89279,"source":{"system":"sec-edgar","filing":"0001181431-08-059340","document":"rrd221969.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/40799/000118143108059340/rrd221969.xml","form_type":"4"}},{"id":289575,"issuer":{"id":3904,"kind":"organization","name":"WHITE MOUNTAINS INSURANCE GROUP LTD"},"owners":[{"id":2792,"kind":"organization","name":"BERKSHIRE HATHAWAY INC","symbol":"BRK.A","position":1,"cik":"0001067983","reported_name":"BERKSHIRE HATHAWAY INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":10509,"kind":"person","name":"BUFFETT WARREN E","position":2,"cik":"0000315090","reported_name":"BUFFETT WARREN E","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":12430,"kind":"organization","name":"GENERAL RE CORP","position":3,"cik":"0000317745","reported_name":"GENERAL RE CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Warrant (right to buy)","published_at":"2004-07-02T01:36:23.000Z","date":"2004-06-29","kind":"exercise","acquired":false,"shares":1724200,"price":175,"value":301735000.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F1","text":"These securities include (i) 544,285 common shares issuable upon the exercise of Series B Warrants pursuant to the approval of White Mountain's shareholders on August 23, 2001 and (ii) 9,915 common shares issuable upon the exercise of the Series A Warrants and Series B Warrants due to an issuance of convertible preference shares and common shares by White Mountains on October 24, 2002."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These securities are owned directly by General Reinsurance Corporation, which is a wholly-owned subsidiary of General Re Corporation, which is a wholly-owned subsidiary of Berkshire Hathaway Inc.  General Re Corporation and Berkshire Hathaway Inc. are indirect beneficial owners of the reported securities."}],"balance_after":0,"derivative":{"exercise_price":170.51,"exercise_date":"2004-06-29","expiration_date":"2008-06-01","underlying":"Common Shares","underlying_shares":1724200},"source":{"system":"sec-edgar","filing":"0001181431-04-033554","document":"rrd47039.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/315090/000118143104033554/rrd47039.xml","form_type":"4"}},{"id":289574,"issuer":{"id":3904,"kind":"organization","name":"WHITE MOUNTAINS INSURANCE GROUP LTD"},"owners":[{"id":2792,"kind":"organization","name":"BERKSHIRE HATHAWAY INC","symbol":"BRK.A","position":1,"cik":"0001067983","reported_name":"BERKSHIRE HATHAWAY INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":10509,"kind":"person","name":"BUFFETT WARREN E","position":2,"cik":"0000315090","reported_name":"BUFFETT WARREN E","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":12430,"kind":"organization","name":"GENERAL RE CORP","position":3,"cik":"0000317745","reported_name":"GENERAL RE CORP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Shares, $1.00 par value","published_at":"2004-07-02T01:36:23.000Z","date":"2004-06-29","kind":"exercise","acquired":true,"shares":1724200,"price":170.51,"value":293993342.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"These securities include (i) 544,285 common shares issuable upon the exercise of Series B Warrants pursuant to the approval of White Mountain's shareholders on August 23, 2001 and (ii) 9,915 common shares issuable upon the exercise of the Series A Warrants and Series B Warrants due to an issuance of convertible preference shares and common shares by White Mountains on October 24, 2002."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These securities are owned directly by General Reinsurance Corporation, which is a wholly-owned subsidiary of General Re Corporation, which is a wholly-owned subsidiary of Berkshire Hathaway Inc.  General Re Corporation and Berkshire Hathaway Inc. are indirect beneficial owners of the reported securities."}],"balance_after":1724200,"source":{"system":"sec-edgar","filing":"0001181431-04-033554","document":"rrd47039.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/315090/000118143104033554/rrd47039.xml","form_type":"4"}}]}