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These shares were sold in multiple transactions at prices ranging from $70.10 to $70.37 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001591747-26-000007","document":"form4-09152026_040930.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000007/form4-09152026_040930.xml","form_type":"4"}},{"id":4618123,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-15T20:30:35.000Z","date":"2026-09-11","kind":"exercise","planned":false,"acquired":true,"shares":10000,"price":50.86,"value":508600.0,"ownership":{"direct":true},"balance_after":27136,"source":{"system":"sec-edgar","filing":"0001591747-26-000007","document":"form4-09152026_040930.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000007/form4-09152026_040930.xml","form_type":"4"}},{"id":4618122,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-15T20:30:35.000Z","date":"2026-09-11","kind":"exercise","planned":false,"acquired":true,"shares":10000,"price":38.85,"value":388500.0,"ownership":{"direct":true},"balance_after":17136,"source":{"system":"sec-edgar","filing":"0001591747-26-000007","document":"form4-09152026_040930.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000007/form4-09152026_040930.xml","form_type":"4"}},{"id":4618121,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-15T20:30:35.000Z","date":"2026-09-11","kind":"exercise","planned":false,"acquired":true,"shares":7136,"price":45.69,"value":326043.84,"ownership":{"direct":true},"balance_after":7136,"source":{"system":"sec-edgar","filing":"0001591747-26-000007","document":"form4-09152026_040930.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000007/form4-09152026_040930.xml","form_type":"4"}},{"id":4613383,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-09T20:23:31.000Z","date":"2026-09-04","kind":"sale","planned":true,"acquired":false,"shares":18,"price":79.96,"value":1439.28,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $79.98 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Fund XII, L.P. (\"Atlas XII\"). The general partner of Atlas XII is Atlas Venture Associates XII, L.P. (\"Associates XII\"). Atlas Venture Associates XII, LLC (\"Associates XII LLC\") is the general partner of Associates XII. The Reporting Person is a member of Associates XII LLC and disclaims beneficial ownership of such securities held by Atlas XII, except to the extent of his pecuniary interest therein, if any."}],"balance_after":13427,"source":{"system":"sec-edgar","filing":"0001591747-26-000005","document":"form4-09092026_080927.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000005/form4-09092026_080927.xml","form_type":"4"}},{"id":4613382,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-09T20:23:31.000Z","date":"2026-09-04","kind":"sale","planned":true,"acquired":false,"shares":759,"price":79.96,"value":60689.64,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $79.98 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Atlas Venture Opportunity Fund II, L.P. (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, L.P. (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any."}],"balance_after":312230,"source":{"system":"sec-edgar","filing":"0001591747-26-000005","document":"form4-09092026_080927.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000005/form4-09092026_080927.xml","form_type":"4"}},{"id":4613381,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-09T20:23:31.000Z","date":"2026-09-04","kind":"sale","planned":true,"acquired":false,"shares":912,"price":79.96,"value":72923.52,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $79.98 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Atlas Venture Opportunity Fund I, L.P. (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, L.P. (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":318866,"source":{"system":"sec-edgar","filing":"0001591747-26-000005","document":"form4-09092026_080927.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000005/form4-09092026_080927.xml","form_type":"4"}},{"id":3271,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-03","kind":"sale","planned":true,"acquired":false,"shares":54,"price":79.98,"value":4318.92,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.28 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Atlas Venture Fund XII, L.P. (\"Atlas XII\"). The general partner of Atlas XII is Atlas Venture Associates XII, L.P. (\"Associates XII\"). Atlas Venture Associates XII, LLC (\"Associates XII LLC\") is the general partner of Associates XII. The Reporting Person is a member of Associates XII LLC and disclaims beneficial ownership of such securities held by Atlas XII, except to the extent of his pecuniary interest therein, if any."}],"balance_after":13445,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":3270,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-03","kind":"sale","planned":true,"acquired":false,"shares":2339,"price":79.98,"value":187073.22,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.28 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Atlas Venture Opportunity Fund II, L.P. (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, L.P. (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any."}],"balance_after":312989,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":3269,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-03","kind":"sale","planned":true,"acquired":false,"shares":2810,"price":79.98,"value":224743.8,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.28 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, L.P. (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, L.P. (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":319778,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":3268,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-02","kind":"sale","planned":true,"acquired":false,"shares":2,"price":80.98,"value":161.96,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $80.9677 to $81.0079 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Atlas Venture Fund XII, L.P. (\"Atlas XII\"). The general partner of Atlas XII is Atlas Venture Associates XII, L.P. (\"Associates XII\"). Atlas Venture Associates XII, LLC (\"Associates XII LLC\") is the general partner of Associates XII. The Reporting Person is a member of Associates XII LLC and disclaims beneficial ownership of such securities held by Atlas XII, except to the extent of his pecuniary interest therein, if any."}],"balance_after":13499,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":3267,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-02","kind":"sale","planned":true,"acquired":false,"shares":9,"price":80.98,"value":728.82,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $80.9677 to $81.0079 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Atlas Venture Opportunity Fund II, L.P. (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, L.P. (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any."}],"balance_after":315328,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":3266,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-02","kind":"sale","planned":true,"acquired":false,"shares":10,"price":80.98,"value":809.8,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $80.9677 to $81.0079 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, L.P. (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, L.P. (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":322588,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":3265,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-02","kind":"sale","planned":true,"acquired":false,"shares":511,"price":80.17,"value":40966.87,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.9421 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Atlas Venture Fund XII, L.P. (\"Atlas XII\"). The general partner of Atlas XII is Atlas Venture Associates XII, L.P. (\"Associates XII\"). Atlas Venture Associates XII, LLC (\"Associates XII LLC\") is the general partner of Associates XII. The Reporting Person is a member of Associates XII LLC and disclaims beneficial ownership of such securities held by Atlas XII, except to the extent of his pecuniary interest therein, if any."}],"balance_after":13501,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":3264,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-02","kind":"sale","planned":true,"acquired":false,"shares":22090,"price":80.17,"value":1770955.3,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.9421 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Atlas Venture Opportunity Fund II, L.P. (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, L.P. (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any."}],"balance_after":315337,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":3263,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-02","kind":"sale","planned":true,"acquired":false,"shares":26542,"price":80.17,"value":2127872.14,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.9421 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, L.P. (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, L.P. (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":322598,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":3262,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-01","kind":"sale","planned":true,"acquired":false,"shares":1,"price":79.95,"value":79.95,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Atlas Venture Fund XII, L.P. (\"Atlas XII\"). The general partner of Atlas XII is Atlas Venture Associates XII, L.P. (\"Associates XII\"). Atlas Venture Associates XII, LLC (\"Associates XII LLC\") is the general partner of Associates XII. The Reporting Person is a member of Associates XII LLC and disclaims beneficial ownership of such securities held by Atlas XII, except to the extent of his pecuniary interest therein, if any."}],"balance_after":14012,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":3261,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-01","kind":"sale","planned":true,"acquired":false,"shares":58,"price":79.95,"value":4637.1,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Atlas Venture Opportunity Fund II, L.P. (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, L.P. (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any."}],"balance_after":337427,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":3260,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-03T21:43:43.000Z","date":"2026-09-01","kind":"sale","planned":true,"acquired":false,"shares":70,"price":79.95,"value":5596.5,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, L.P. (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, L.P. (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":349140,"source":{"system":"sec-edgar","filing":"0001591747-26-000002","document":"form4-09032026_090939.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174726000002/form4-09032026_090939.xml","form_type":"4"}},{"id":729198,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2026-06-23T20:56:52.000Z","date":"2026-06-18","kind":"grant","planned":false,"acquired":true,"shares":6212,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares underlying this option vest upon the first to occur of (i) the date of the Company's 2027 annual meeting of its stockholders, or (ii) the one-year anniversary of the grant date, subject to the Reporting Person's continued service on such vesting date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"This option was granted to the Reporting Person, a director of the Issuer. The proceeds of any sale of shares of common stock issued to the Reporting Person upon exercise of this option will be transferred to Atlas Venture Life Science Advisors, LLC and as such, the Reporting Person disclaims ownership of such securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of his pecuniary interest therein, if any."}],"balance_after":6212,"derivative":{"exercise_price":70.79,"expiration_date":"2036-06-17","underlying":"Common Stock","underlying_shares":6212},"source":{"system":"sec-edgar","filing":"0001193125-26-279705","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000119312526279705/ownership.xml","form_type":"4"}},{"id":963211,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-18T23:14:55.000Z","date":"2025-12-17","kind":"sale","planned":false,"acquired":false,"shares":148,"price":91.47,"value":13537.56,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.2501 to $91.52 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are held by Atlas Venture Fund XII, L.P. (\"Atlas XII\"). The general partner of Atlas XII is Atlas Venture Associates XII, L.P. (\"Associates XII\"). Atlas Venture Associates XII, LLC (\"Associates XII LLC\") is the general partner of Associates XII. The Reporting Person is a member of Associates XII LLC and disclaims beneficial ownership of such securities held by Atlas XII, except to the extent of his pecuniary interest therein, if any."}],"balance_after":14013,"source":{"system":"sec-edgar","filing":"0001591747-25-000008","document":"form4-12182025_111250.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000008/form4-12182025_111250.xml","form_type":"4"}},{"id":963210,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-18T23:14:55.000Z","date":"2025-12-17","kind":"sale","planned":false,"acquired":false,"shares":213,"price":91.47,"value":19483.11,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.2501 to $91.52 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any."}],"balance_after":337485,"source":{"system":"sec-edgar","filing":"0001591747-25-000008","document":"form4-12182025_111250.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000008/form4-12182025_111250.xml","form_type":"4"}},{"id":963209,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-18T23:14:55.000Z","date":"2025-12-17","kind":"sale","planned":false,"acquired":false,"shares":393,"price":91.47,"value":35947.71,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.2501 to $91.52 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":349210,"source":{"system":"sec-edgar","filing":"0001591747-25-000008","document":"form4-12182025_111250.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000008/form4-12182025_111250.xml","form_type":"4"}},{"id":967708,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2025-12-17T02:43:15.000Z","date":"2025-12-15","kind":"exercise","planned":false,"acquired":false,"shares":7000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F11","text":"Fully Vested."}],"balance_after":0,"derivative":{"exercise_price":13.5,"expiration_date":"2032-12-28","underlying":"Common Stock","underlying_shares":7000},"source":{"system":"sec-edgar","filing":"0001104659-25-121740","document":"tm2530644-8_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":21,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000110465925121740/tm2530644-8_4seq1.xml","form_type":"4"}},{"id":967707,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-17T02:43:15.000Z","date":"2025-12-16","kind":"sale","planned":false,"acquired":false,"shares":14359,"price":91.24,"value":1310115.16,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F10","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.00 to $91.705 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Atlas Venture Fund XII, L.P. (\"Atlas XII\"). The general partner of Atlas XII is Atlas Venture Associates XII, L.P. (\"Associates XII\"). Atlas Venture Associates XII, LLC (\"Associates XII LLC\") is the general partner of Associates XII. The Reporting Person is a member of Associates XII LLC and disclaims beneficial ownership of such securities held by Atlas XII, except to the extent of his pecuniary interest therein, if any."}],"balance_after":14161,"source":{"system":"sec-edgar","filing":"0001104659-25-121740","document":"tm2530644-8_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":20,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000110465925121740/tm2530644-8_4seq1.xml","form_type":"4"}},{"id":967706,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-17T02:43:15.000Z","date":"2025-12-16","kind":"sale","planned":false,"acquired":false,"shares":18666,"price":91.24,"value":1703085.84,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F10","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.00 to $91.705 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any."}],"balance_after":337698,"source":{"system":"sec-edgar","filing":"0001104659-25-121740","document":"tm2530644-8_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":19,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000110465925121740/tm2530644-8_4seq1.xml","form_type":"4"}},{"id":967705,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-17T02:43:15.000Z","date":"2025-12-16","kind":"sale","planned":false,"acquired":false,"shares":35898,"price":91.24,"value":3275333.52,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F10","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.00 to $91.705 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":349603,"source":{"system":"sec-edgar","filing":"0001104659-25-121740","document":"tm2530644-8_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":18,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000110465925121740/tm2530644-8_4seq1.xml","form_type":"4"}},{"id":967704,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-17T02:43:15.000Z","date":"2025-12-15","kind":"sale","planned":false,"acquired":false,"shares":7000,"price":91.87,"value":643090.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F9","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $92.00 to $92.48 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. 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These shares were sold in multiple transactions at prices ranging from $91.00 to $91.99 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. 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These shares were sold in multiple transactions at prices ranging from $92.00 to $92.48 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. 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These shares were sold in multiple transactions at prices ranging from $93.52 to $94.255 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Atlas Venture Fund XII, L.P. (\"Atlas XII\"). The general partner of Atlas XII is Atlas Venture Associates XII, L.P. (\"Associates XII\"). Atlas Venture Associates XII, LLC (\"Associates XII LLC\") is the general partner of Associates XII. The Reporting Person is a member of Associates XII LLC and disclaims beneficial ownership of such securities held by Atlas XII, except to the extent of his pecuniary interest therein, if any."}],"balance_after":41519,"source":{"system":"sec-edgar","filing":"0001104659-25-121740","document":"tm2530644-8_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000110465925121740/tm2530644-8_4seq1.xml","form_type":"4"}},{"id":967695,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-17T02:43:15.000Z","date":"2025-12-12","kind":"sale","planned":false,"acquired":false,"shares":1540,"price":92.58,"value":142573.2,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $92.52 to $93.3796 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Atlas Venture Fund XII, L.P. (\"Atlas XII\"). The general partner of Atlas XII is Atlas Venture Associates XII, L.P. (\"Associates XII\"). Atlas Venture Associates XII, LLC (\"Associates XII LLC\") is the general partner of Associates XII. 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These shares were sold in multiple transactions at prices ranging from $91.5289 to $92.4325 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (3), (4), (7), (8), (9) and (10)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are held by Atlas Venture Fund XII, L.P. (\"Atlas XII\"). The general partner of Atlas XII is Atlas Venture Associates XII, L.P. (\"Associates XII\"). Atlas Venture Associates XII, LLC (\"Associates XII LLC\") is the general partner of Associates XII. 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These shares were sold in multiple transactions at prices ranging from $91.5289 to $92.4325 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (3), (4), (7), (8), (9) and (10)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. 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These shares were sold in multiple transactions at prices ranging from $92.52 to $93.3796 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":421781,"source":{"system":"sec-edgar","filing":"0001104659-25-121740","document":"tm2530644-8_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000110465925121740/tm2530644-8_4seq1.xml","form_type":"4"}},{"id":967688,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-17T02:43:15.000Z","date":"2025-12-12","kind":"sale","planned":false,"acquired":false,"shares":16403,"price":92.05,"value":1509896.15,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.5289 to $92.4325 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (3), (4), (7), (8), (9) and (10)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":425633,"source":{"system":"sec-edgar","filing":"0001104659-25-121740","document":"tm2530644-8_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000110465925121740/tm2530644-8_4seq1.xml","form_type":"4"}},{"id":1016865,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-17T20:41:42.000Z","date":"2025-10-17","kind":"sale","planned":false,"acquired":false,"shares":450,"price":91.88,"value":41346.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F11","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.37 to $92.15 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any."}],"balance_after":385549,"source":{"system":"sec-edgar","filing":"0001591747-25-000006","document":"form4-10172025_081039.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":17,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000006/form4-10172025_081039.xml","form_type":"4"}},{"id":1016864,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-17T20:41:42.000Z","date":"2025-10-17","kind":"sale","planned":false,"acquired":false,"shares":450,"price":91.88,"value":41346.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F11","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.37 to $92.15 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":442036,"source":{"system":"sec-edgar","filing":"0001591747-25-000006","document":"form4-10172025_081039.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":16,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000006/form4-10172025_081039.xml","form_type":"4"}},{"id":1016863,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-17T20:41:42.000Z","date":"2025-10-17","kind":"sale","planned":false,"acquired":false,"shares":10095,"price":90.66,"value":915212.7,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F10","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $90.25 to $91.24 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. 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These shares were sold in multiple transactions at prices ranging from $90.25 to $91.24 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":442486,"source":{"system":"sec-edgar","filing":"0001591747-25-000006","document":"form4-10172025_081039.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000006/form4-10172025_081039.xml","form_type":"4"}},{"id":1016861,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-17T20:41:42.000Z","date":"2025-10-17","kind":"sale","planned":false,"acquired":false,"shares":2251,"price":89.7,"value":201914.7,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F9","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $89.25 to $90.23 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. 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These shares were sold in multiple transactions at prices ranging from $89.25 to $90.23 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":452580,"source":{"system":"sec-edgar","filing":"0001591747-25-000006","document":"form4-10172025_081039.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000006/form4-10172025_081039.xml","form_type":"4"}},{"id":1016859,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-17T20:41:42.000Z","date":"2025-10-17","kind":"sale","planned":false,"acquired":false,"shares":13014,"price":88.91,"value":1157074.74,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $88.17 to $89.04 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. 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These shares were sold in multiple transactions at prices ranging from $88.17 to $89.04 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. 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These shares were sold in multiple transactions at prices ranging from $87.12 to $88.03 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. 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These shares were sold in multiple transactions at prices ranging from $87.12 to $88.03 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":467845,"source":{"system":"sec-edgar","filing":"0001591747-25-000006","document":"form4-10172025_081039.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000006/form4-10172025_081039.xml","form_type":"4"}},{"id":1016855,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-17T20:41:42.000Z","date":"2025-10-17","kind":"sale","planned":false,"acquired":false,"shares":3000,"price":86.13,"value":258390.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $85.91 to $86.90 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. 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These shares were sold in multiple transactions at prices ranging from $85.91 to $86.90 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":472911,"source":{"system":"sec-edgar","filing":"0001591747-25-000006","document":"form4-10172025_081039.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000006/form4-10172025_081039.xml","form_type":"4"}},{"id":1016853,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-17T20:41:42.000Z","date":"2025-10-17","kind":"sale","planned":false,"acquired":false,"shares":1125,"price":84.89,"value":95501.25,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any."}],"balance_after":419424,"source":{"system":"sec-edgar","filing":"0001591747-25-000006","document":"form4-10172025_081039.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000006/form4-10172025_081039.xml","form_type":"4"}},{"id":1016852,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-17T20:41:42.000Z","date":"2025-10-17","kind":"sale","planned":false,"acquired":false,"shares":1125,"price":84.89,"value":95501.25,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":475911,"source":{"system":"sec-edgar","filing":"0001591747-25-000006","document":"form4-10172025_081039.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000006/form4-10172025_081039.xml","form_type":"4"}},{"id":1016851,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-17T20:41:42.000Z","date":"2025-10-16","kind":"sale","planned":false,"acquired":false,"shares":1425,"price":77.11,"value":109881.75,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.52 to $77.30 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":477036,"source":{"system":"sec-edgar","filing":"0001591747-25-000006","document":"form4-10172025_081039.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000006/form4-10172025_081039.xml","form_type":"4"}},{"id":1016850,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-17T20:41:42.000Z","date":"2025-10-15","kind":"sale","planned":false,"acquired":false,"shares":2618,"price":77.76,"value":203575.68,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $77.75 to $77.77 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":478461,"source":{"system":"sec-edgar","filing":"0001591747-25-000006","document":"form4-10172025_081039.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000006/form4-10172025_081039.xml","form_type":"4"}},{"id":1016849,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-17T20:41:42.000Z","date":"2025-10-15","kind":"sale","planned":false,"acquired":false,"shares":19542,"price":77.16,"value":1507860.72,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.75 to $77.60 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (3), (4), (6), (7), (8), (9), (10) and (11)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. 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These shares were sold in multiple transactions at prices ranging from $72.0474 to $72.6152 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":500621,"source":{"system":"sec-edgar","filing":"0001591747-25-000004","document":"form4-10092025_081000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000004/form4-10092025_081000.xml","form_type":"4"}},{"id":1020860,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-09T20:07:04.000Z","date":"2025-10-08","kind":"sale","planned":false,"acquired":false,"shares":12689,"price":71.51,"value":907390.39,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.03 to $72.0233 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":513888,"source":{"system":"sec-edgar","filing":"0001591747-25-000004","document":"form4-10092025_081000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000004/form4-10092025_081000.xml","form_type":"4"}},{"id":1020859,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-09T20:07:04.000Z","date":"2025-10-08","kind":"sale","planned":false,"acquired":false,"shares":25400,"price":70.54,"value":1791716.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.0293 to $71.028 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":526577,"source":{"system":"sec-edgar","filing":"0001591747-25-000004","document":"form4-10092025_081000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000004/form4-10092025_081000.xml","form_type":"4"}},{"id":1020858,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-09T20:07:04.000Z","date":"2025-10-08","kind":"sale","planned":false,"acquired":false,"shares":12386,"price":69.31,"value":858473.66,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.0173 to $69.9882 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":551977,"source":{"system":"sec-edgar","filing":"0001591747-25-000004","document":"form4-10092025_081000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000004/form4-10092025_081000.xml","form_type":"4"}},{"id":1020857,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-09T20:07:04.000Z","date":"2025-10-08","kind":"sale","planned":false,"acquired":false,"shares":8219,"price":68.26,"value":561028.94,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.01 to $69.00 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":564363,"source":{"system":"sec-edgar","filing":"0001591747-25-000004","document":"form4-10092025_081000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000004/form4-10092025_081000.xml","form_type":"4"}},{"id":1020856,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-09T20:07:04.000Z","date":"2025-10-07","kind":"sale","planned":false,"acquired":false,"shares":6661,"price":69.01,"value":459675.61,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.00 to $69.08 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":572582,"source":{"system":"sec-edgar","filing":"0001591747-25-000004","document":"form4-10092025_081000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000004/form4-10092025_081000.xml","form_type":"4"}},{"id":1020855,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-09T20:07:04.000Z","date":"2025-10-07","kind":"sale","planned":false,"acquired":false,"shares":11378,"price":68.01,"value":773817.78,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.00 to $68.12 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (3), (4), (5), (6), (7) and (8)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":579243,"source":{"system":"sec-edgar","filing":"0001591747-25-000004","document":"form4-10092025_081000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000159174725000004/form4-10092025_081000.xml","form_type":"4"}},{"id":1055815,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-26T22:01:57.000Z","date":"2025-08-22","kind":"sale","planned":true,"acquired":false,"shares":2287,"price":61.03,"value":139575.61,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan dated January 31, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.95 to $61.05 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":590621,"source":{"system":"sec-edgar","filing":"0001415889-25-023049","document":"form4-08262025_100853.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000141588925023049/form4-08262025_100853.xml","form_type":"4"}},{"id":1065405,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-15T23:23:46.000Z","date":"2025-08-14","kind":"sale","planned":true,"acquired":false,"shares":7212,"price":60.99,"value":439859.88,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan dated January 31, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.95 to $61.11 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":592908,"source":{"system":"sec-edgar","filing":"0001415889-25-022124","document":"form4-08152025_110842.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000141588925022124/form4-08152025_110842.xml","form_type":"4"}},{"id":1065404,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-15T23:23:46.000Z","date":"2025-08-13","kind":"sale","planned":true,"acquired":false,"shares":24962,"price":61.15,"value":1526426.3,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan dated January 31, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.95 to $61.615 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (4)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":600120,"source":{"system":"sec-edgar","filing":"0001415889-25-022124","document":"form4-08152025_110842.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000141588925022124/form4-08152025_110842.xml","form_type":"4"}},{"id":1072352,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-07T21:00:08.000Z","date":"2025-08-05","kind":"sale","planned":true,"acquired":false,"shares":395,"price":60.95,"value":24075.25,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan dated January 31, 2025."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":625082,"source":{"system":"sec-edgar","filing":"0001415889-25-021281","document":"form4-08072025_050804.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000141588925021281/form4-08072025_050804.xml","form_type":"4"}},{"id":1077654,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-01T20:32:51.000Z","date":"2025-07-30","kind":"sale","planned":true,"acquired":false,"shares":8492,"price":61.04,"value":518351.68,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares were sold pursuant to a Rule 10b5-1 trading plan dated January 31, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.95 to $61.35 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":625477,"source":{"system":"sec-edgar","filing":"0001415889-25-020863","document":"form4-08012025_080848.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000141588925020863/form4-08012025_080848.xml","form_type":"4"}},{"id":1081437,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-07-25T21:22:35.000Z","date":"2025-07-24","kind":"sale","planned":false,"acquired":false,"shares":13033,"price":61.17,"value":797228.61,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.95 to $61.55 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":633969,"source":{"system":"sec-edgar","filing":"0001415889-25-020295","document":"form4-07252025_090732.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000141588925020295/form4-07252025_090732.xml","form_type":"4"}},{"id":1081436,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-07-25T21:22:35.000Z","date":"2025-07-23","kind":"sale","planned":false,"acquired":false,"shares":29837,"price":60.97,"value":1819161.89,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.95 to $61.10 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":647002,"source":{"system":"sec-edgar","filing":"0001415889-25-020295","document":"form4-07252025_090732.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000141588925020295/form4-07252025_090732.xml","form_type":"4"}},{"id":1083449,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-07-22T20:44:57.000Z","date":"2025-07-18","kind":"sale","planned":false,"acquired":false,"shares":664,"price":61.13,"value":40590.32,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.96 to $61.33 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":676839,"source":{"system":"sec-edgar","filing":"0001415889-25-020127","document":"form4-07222025_080753.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000141588925020127/form4-07222025_080753.xml","form_type":"4"}},{"id":1111854,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2025-06-13T21:14:57.000Z","date":"2025-06-11","kind":"grant","planned":false,"acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares underlying this option vest upon the first to occur of (i) the date of the Company's 2026 annual meeting of its stockholders, or (ii) the one-year anniversary of the grant date, subject to the Reporting Person's continued service on such vesting date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"This option was granted to the Reporting Person, a director of the Issuer. The proceeds of any sale of shares of common stock issued to the Reporting Person upon exercise of this option will be transferred to Atlas Venture Life Science Advisors, LLC and as such, the Reporting Person disclaims ownership of such securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of his pecuniary interest therein, if any."}],"balance_after":10000,"derivative":{"exercise_price":50.86,"expiration_date":"2035-06-10","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0000950170-25-086371","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000095017025086371/ownership.xml","form_type":"4"}},{"id":1473326,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-06-21T00:00:05.000Z","date":"2024-06-17","kind":"purchase","planned":false,"acquired":true,"shares":222223,"price":36,"value":8000028.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any."}],"balance_after":420549,"source":{"system":"sec-edgar","filing":"0001415889-24-017727","document":"form4-06202024_080601.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000141588924017727/form4-06202024_080601.xml","form_type":"4"}},{"id":1479197,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2024-06-14T20:15:09.000Z","date":"2024-06-12","kind":"grant","planned":false,"acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares underlying this option vest upon the first to occur of (i) the date of the Company's 2025 annual meeting of its stockholders, or (ii) the one-year anniversary of the grant date, subject to the Reporting Person's continued service on such vesting date."}],"balance_after":10000,"derivative":{"exercise_price":38.85,"expiration_date":"2034-06-11","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0000950170-24-073674","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000095017024073674/ownership.xml","form_type":"4"}},{"id":1589301,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-03-07T21:40:32.000Z","date":"2024-03-05","kind":"sale","planned":false,"acquired":false,"shares":26157,"price":73.5,"value":1922539.5,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $73.00 to $73.80 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":677503,"source":{"system":"sec-edgar","filing":"0001415889-24-007190","document":"form4-03072024_090324.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000141588924007190/form4-03072024_090324.xml","form_type":"4"}},{"id":1671046,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-01-25T21:33:04.000Z","date":"2024-01-23","kind":"sale","planned":false,"acquired":false,"shares":20000,"price":67.65,"value":1353000.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity Fund II, LP (\"Opportunity II\"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, LP (\"Associates II\"). Atlas Venture Associates Opportunity II, LLC (\"Associates II LLC\") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any."}],"balance_after":198326,"source":{"system":"sec-edgar","filing":"0001209191-24-002233","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919124002233/doc4.xml","form_type":"4"}},{"id":1671045,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-01-25T21:33:04.000Z","date":"2024-01-23","kind":"sale","planned":false,"acquired":false,"shares":82500,"price":67.65,"value":5581125.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"These shares are held by Atlas Venture Opportunity Fund I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":703660,"source":{"system":"sec-edgar","filing":"0001209191-24-002233","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919124002233/doc4.xml","form_type":"4"}},{"id":1680116,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-01-12T22:12:53.000Z","date":"2024-01-10","kind":"sale","planned":false,"acquired":false,"shares":20000,"price":64,"value":1280000.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":786160,"source":{"system":"sec-edgar","filing":"0001209191-24-001543","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919124001543/doc4.xml","form_type":"4"}},{"id":1711086,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-12-15T01:14:42.000Z","date":"2023-12-14","kind":"sale","planned":false,"acquired":false,"shares":120,"price":59.74,"value":7168.8,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F11","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $59.53 to $60.17 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":806160,"source":{"system":"sec-edgar","filing":"0001209191-23-058708","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123058708/doc4.xml","form_type":"4"}},{"id":1711085,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-12-15T01:14:42.000Z","date":"2023-12-14","kind":"sale","planned":false,"acquired":false,"shares":20429,"price":58.27,"value":1190397.83,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F10","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $58.25 to $58.65 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":806280,"source":{"system":"sec-edgar","filing":"0001209191-23-058708","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123058708/doc4.xml","form_type":"4"}},{"id":1711084,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-12-15T01:14:42.000Z","date":"2023-12-13","kind":"sale","planned":false,"acquired":false,"shares":40,"price":60.5,"value":2420.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":826709,"source":{"system":"sec-edgar","filing":"0001209191-23-058708","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123058708/doc4.xml","form_type":"4"}},{"id":1711083,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-12-15T01:14:42.000Z","date":"2023-12-13","kind":"sale","planned":false,"acquired":false,"shares":3508,"price":59.99,"value":210444.92,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F9","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $59.50 to $60.4381 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":826749,"source":{"system":"sec-edgar","filing":"0001209191-23-058708","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123058708/doc4.xml","form_type":"4"}},{"id":1711082,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-12-15T01:14:42.000Z","date":"2023-12-12","kind":"sale","planned":false,"acquired":false,"shares":6599,"price":65.77,"value":434016.23,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $65.745 to $66.32 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":830257,"source":{"system":"sec-edgar","filing":"0001209191-23-058708","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123058708/doc4.xml","form_type":"4"}},{"id":1711081,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-12-15T01:14:42.000Z","date":"2023-12-12","kind":"sale","planned":false,"acquired":false,"shares":18615,"price":65.1,"value":1211836.5,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.7499 to $65.735 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":836856,"source":{"system":"sec-edgar","filing":"0001209191-23-058708","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123058708/doc4.xml","form_type":"4"}},{"id":1711080,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-12-15T01:14:42.000Z","date":"2023-12-12","kind":"sale","planned":false,"acquired":false,"shares":688,"price":63.78,"value":43880.64,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.70 to $64.67 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":855471,"source":{"system":"sec-edgar","filing":"0001209191-23-058708","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123058708/doc4.xml","form_type":"4"}},{"id":1711079,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-12-15T01:14:42.000Z","date":"2023-12-12","kind":"sale","planned":false,"acquired":false,"shares":665,"price":62.9,"value":41828.5,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.6436 to $63.3256 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":856159,"source":{"system":"sec-edgar","filing":"0001209191-23-058708","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123058708/doc4.xml","form_type":"4"}},{"id":1711078,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-12-15T01:14:42.000Z","date":"2023-12-12","kind":"sale","planned":false,"acquired":false,"shares":4155,"price":62.42,"value":259355.1,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $61.5297 to $62.5175 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":856824,"source":{"system":"sec-edgar","filing":"0001209191-23-058708","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123058708/doc4.xml","form_type":"4"}},{"id":1711077,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-12-15T01:14:42.000Z","date":"2023-12-12","kind":"sale","planned":false,"acquired":false,"shares":422,"price":60.99,"value":25737.78,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.51 to $61.50 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":860979,"source":{"system":"sec-edgar","filing":"0001209191-23-058708","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123058708/doc4.xml","form_type":"4"}},{"id":1711076,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-12-15T01:14:42.000Z","date":"2023-12-12","kind":"sale","planned":false,"acquired":false,"shares":20823,"price":59.87,"value":1246673.01,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $59.50 to $60.497 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (3), (4), (5), (6), (7), (8), (9), (10) and (11)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":861401,"source":{"system":"sec-edgar","filing":"0001209191-23-058708","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123058708/doc4.xml","form_type":"4"}},{"id":1803730,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-08-17T20:13:37.000Z","date":"2023-08-15","kind":"sale","planned":false,"acquired":false,"shares":72931,"price":52.4,"value":3821584.4,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"These shares are held by Atlas Venture Opportunity I, LP (\"Opportunity I\"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, LP (\"Associates I\"). Atlas Venture Associates Opportunity I, LLC (\"Associates I LLC\") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any."}],"balance_after":882224,"source":{"system":"sec-edgar","filing":"0001209191-23-046252","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000120919123046252/doc4.xml","form_type":"4"}},{"id":1860800,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2023-06-09T22:19:07.000Z","date":"2023-06-09","kind":"grant","planned":false,"acquired":true,"shares":7136,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares underlying this option vest upon the first to occur of (i) the date of the Company's 2024 annual meeting of its stockholders, or (ii) the one-year anniversary of the grant date, subject to the Reporting Person's continued service on such vesting date."}],"balance_after":7136,"derivative":{"exercise_price":45.69,"expiration_date":"2033-06-08","underlying":"Common Stock","underlying_shares":7136},"source":{"system":"sec-edgar","filing":"0000899243-23-015266","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000089924323015266/doc4.xml","form_type":"4"}},{"id":2072811,"issuer":{"id":2273,"kind":"organization","name":"Disc Medicine, Inc.","symbol":"IRON"},"owners":[{"id":2274,"kind":"person","name":"Bitterman Kevin","position":1,"cik":"0001591747","reported_name":"Bitterman Kevin","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2023-01-04T02:25:26.000Z","date":"2022-12-29","kind":"grant","acquired":true,"shares":7000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares underlying this option vest upon the first to occur of (i) the date of the Company's 2023 annual meeting of its stockholders, or (ii) the one-year anniversary of the grant date, subject to the Reporting Person's continued service on such vesting date."}],"balance_after":7000,"derivative":{"exercise_price":13.5,"expiration_date":"2032-12-28","underlying":"Common Stock","underlying_shares":7000},"source":{"system":"sec-edgar","filing":"0000899243-23-000459","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1816736/000089924323000459/doc4.xml","form_type":"4"}}],"next_cursor":"2023-01-04T02:25:26.000000Z,2072811"}