{"transactions":[{"id":1074766,"issuer":{"id":5607,"kind":"organization","name":"SHOULDER INNOVATIONS, INC.","symbol":"SI"},"owners":[{"id":76909,"kind":"organization","name":"LSV Associates II, LLC","position":1,"cik":"0001818388","reported_name":"LSV Associates II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76910,"kind":"organization","name":"Lightstone Ventures II, L.P.","position":2,"cik":"0001699565","reported_name":"Lightstone Ventures II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76911,"kind":"organization","name":"Lightstone Ventures II (A), L.P.","position":3,"cik":"0001706610","reported_name":"Lightstone Ventures II (A), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76912,"kind":"person","name":"Plain Henry A JR","position":4,"cik":"0001384286","reported_name":"Plain Henry A JR","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76913,"kind":"person","name":"George Jean","position":5,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}}],"security":"Series D Convertible Preferred Stock","published_at":"2025-08-05T16:05:15.000Z","date":"2025-08-01","kind":"exercise","planned":false,"acquired":false,"shares":9950208,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"LSV Associates II, LLC is the general partner of Lightstone Ventures II, L.P. (\"LSV II\") and Lightstone Ventures II (A), L.P. (\"LSV II (A)\") and has sole voting and dispositive power with respect to the shares held by LSV II and LSV II (A). The reporting person is a managing director of LSV Associates II, LLC, and shares voting and dispositive power with respect to the shares held of record by LSV II and LSV II (A). Jean George, Michael A. Carusi and Henry A. Plain, Jr. are the managing directors of LSV Associates II, LLC, and share voting and dispositive power with respect to the shares held of record by LSV II and LSV II (A). Mr. Carusi is a director of the Issuer and files separate Section 16 reports. Each of the reporting persons disclaims beneficial ownership of such shares except to the extent of his, her or its respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Consists of (i) 1,036,638 shares of Common Stock underlying Series C Preferred Stock and 492,833 shares of Common Stock underlying Series D Preferred Stock held by LSV II; and (ii) 60,333 shares of Common Stock underlying Series C Preferred Stock and 28,666 shares of Common Stock underlying Series D Preferred Stock held by LSV II (A)."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":521499},"source":{"system":"sec-edgar","filing":"0001641172-25-022247","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1818388/000164117225022247/ownership.xml","form_type":"4"}},{"id":1074765,"issuer":{"id":5607,"kind":"organization","name":"SHOULDER INNOVATIONS, INC.","symbol":"SI"},"owners":[{"id":76909,"kind":"organization","name":"LSV Associates II, LLC","position":1,"cik":"0001818388","reported_name":"LSV Associates II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76910,"kind":"organization","name":"Lightstone Ventures II, L.P.","position":2,"cik":"0001699565","reported_name":"Lightstone Ventures II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76911,"kind":"organization","name":"Lightstone Ventures II (A), L.P.","position":3,"cik":"0001706610","reported_name":"Lightstone Ventures II (A), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76912,"kind":"person","name":"Plain Henry A JR","position":4,"cik":"0001384286","reported_name":"Plain Henry A JR","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76913,"kind":"person","name":"George Jean","position":5,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}}],"security":"Series C Convertible Preferred Stock","published_at":"2025-08-05T16:05:15.000Z","date":"2025-08-01","kind":"exercise","planned":false,"acquired":false,"shares":20930233,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"LSV Associates II, LLC is the general partner of Lightstone Ventures II, L.P. (\"LSV II\") and Lightstone Ventures II (A), L.P. (\"LSV II (A)\") and has sole voting and dispositive power with respect to the shares held by LSV II and LSV II (A). The reporting person is a managing director of LSV Associates II, LLC, and shares voting and dispositive power with respect to the shares held of record by LSV II and LSV II (A). Jean George, Michael A. Carusi and Henry A. Plain, Jr. are the managing directors of LSV Associates II, LLC, and share voting and dispositive power with respect to the shares held of record by LSV II and LSV II (A). Mr. Carusi is a director of the Issuer and files separate Section 16 reports. Each of the reporting persons disclaims beneficial ownership of such shares except to the extent of his, her or its respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Consists of (i) 1,036,638 shares of Common Stock underlying Series C Preferred Stock and 492,833 shares of Common Stock underlying Series D Preferred Stock held by LSV II; and (ii) 60,333 shares of Common Stock underlying Series C Preferred Stock and 28,666 shares of Common Stock underlying Series D Preferred Stock held by LSV II (A)."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1096971},"source":{"system":"sec-edgar","filing":"0001641172-25-022247","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1818388/000164117225022247/ownership.xml","form_type":"4"}},{"id":1074764,"issuer":{"id":5607,"kind":"organization","name":"SHOULDER INNOVATIONS, INC.","symbol":"SI"},"owners":[{"id":76909,"kind":"organization","name":"LSV Associates II, LLC","position":1,"cik":"0001818388","reported_name":"LSV Associates II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76910,"kind":"organization","name":"Lightstone Ventures II, L.P.","position":2,"cik":"0001699565","reported_name":"Lightstone Ventures II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76911,"kind":"organization","name":"Lightstone Ventures II (A), L.P.","position":3,"cik":"0001706610","reported_name":"Lightstone Ventures II (A), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76912,"kind":"person","name":"Plain Henry A JR","position":4,"cik":"0001384286","reported_name":"Plain Henry A JR","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76913,"kind":"person","name":"George Jean","position":5,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}}],"security":"Common Stock","published_at":"2025-08-05T16:05:15.000Z","date":"2025-08-01","kind":"purchase","planned":false,"acquired":true,"shares":266666,"price":15,"value":3999990.0,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"LSV Associates II, LLC is the general partner of Lightstone Ventures II, L.P. 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Each of the reporting persons disclaims beneficial ownership of such shares except to the extent of his, her or its respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Following the transactions reported in this Form 4, (i) 1,781,479 shares of Common Stock are held by LSV II and (ii) 103,657 shares of Common Stock are held by LSV II (A)."}],"balance_after":1885136,"source":{"system":"sec-edgar","filing":"0001641172-25-022247","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818388/000164117225022247/ownership.xml","form_type":"4"}},{"id":1074763,"issuer":{"id":5607,"kind":"organization","name":"SHOULDER INNOVATIONS, INC.","symbol":"SI"},"owners":[{"id":76909,"kind":"organization","name":"LSV Associates II, LLC","position":1,"cik":"0001818388","reported_name":"LSV Associates II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76910,"kind":"organization","name":"Lightstone Ventures II, L.P.","position":2,"cik":"0001699565","reported_name":"Lightstone Ventures II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76911,"kind":"organization","name":"Lightstone Ventures II (A), L.P.","position":3,"cik":"0001706610","reported_name":"Lightstone Ventures II (A), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76912,"kind":"person","name":"Plain Henry A JR","position":4,"cik":"0001384286","reported_name":"Plain Henry A JR","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}},{"id":76913,"kind":"person","name":"George Jean","position":5,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":false,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Former 10% Owner"}}],"security":"Common Stock","published_at":"2025-08-05T16:05:15.000Z","date":"2025-08-01","kind":"exercise","planned":false,"acquired":true,"shares":1618470,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"LSV Associates II, LLC is the general partner of Lightstone Ventures II, L.P. 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Each of the reporting persons disclaims beneficial ownership of such shares except to the extent of his, her or its respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Following the transactions reported in this Form 4, (i) 1,781,479 shares of Common Stock are held by LSV II and (ii) 103,657 shares of Common Stock are held by LSV II (A)."}],"balance_after":1618470,"source":{"system":"sec-edgar","filing":"0001641172-25-022247","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818388/000164117225022247/ownership.xml","form_type":"4"}},{"id":1638228,"issuer":{"id":92707,"kind":"organization","name":"Cyteir Therapeutics, Inc.","symbol":"CYT"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George 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These shares were sold in multiple transactions at prices ranging from $30.11 to $30.29 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":"Shares are held directly by Lightstone Ventures (A), L.P. (\"LV(A) LP\"). LSV Associates is the general partner of LV(A) LP and may be deemed to beneficially own the shares held by LV(A) LP. Michael A. Carusi, Jean M. George and Henry A. Plain, Jr. are the managing directors of LSV Associates and may be deemed to share voting and investment power over the shares held by LV(A) LP.  Each of LSV Associates and Messrs. 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In addition, in the event of a Change in Control or a Corporate Transaction (each as defined in the plan pursuant to which the Option was granted), any unvested portion of the Option will fully vest and become exercisable as of immediately prior to the effective time of such Change in Control or Corporate Transaction, subject to the reporting person's continuous service on the effective date of such transaction."}],"balance_after":20000,"derivative":{"exercise_price":5.25,"expiration_date":"2030-06-08","underlying":"Common Stock","underlying_shares":20000},"source":{"system":"sec-edgar","filing":"0000899243-20-016151","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1496671/000089924320016151/doc4.xml","form_type":"4"}},{"id":3302847,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to Purchase Common Stock","published_at":"2020-01-24T17:41:33.000Z","date":"2020-01-22","kind":"grant","acquired":true,"shares":8185,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares of common stock underlying this stock option award vest in full on the one year anniversary of the grant date."}],"balance_after":8185,"derivative":{"exercise_price":52.99,"expiration_date":"2030-01-22","underlying":"Common Stock","underlying_shares":8185},"source":{"system":"sec-edgar","filing":"0001179110-20-000775","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000117911020000775/edgar.xml","form_type":"4"}},{"id":3302846,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-01-24T17:41:33.000Z","date":"2020-01-22","kind":"grant","acquired":true,"shares":1377,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":5127,"source":{"system":"sec-edgar","filing":"0001179110-20-000775","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000117911020000775/edgar.xml","form_type":"4"}},{"id":3475975,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to Purchase Common Stock","published_at":"2019-06-28T19:25:47.000Z","date":"2019-06-26","kind":"exercise","acquired":false,"shares":7500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The shares of common stock underlying this stock option award vested in full on the one year anniversary of the grant date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The Reporting Person held the options and underlying shares for the benefit of ATV Capital Management, Inc. 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Pursuant to the policy, the Reporting Person assigned these shares to ACM for no additional consideration."}],"balance_after":0,"derivative":{"exercise_price":30.17,"expiration_date":"2027-03-02","underlying":"Common Stock","underlying_shares":7500},"source":{"system":"sec-edgar","filing":"0001209191-19-039550","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919119039550/doc4.xml","form_type":"4"}},{"id":3475974,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to Purchase Common Stock","published_at":"2019-06-28T19:25:47.000Z","date":"2019-06-26","kind":"exercise","acquired":false,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The shares of common stock underlying this stock option award vested in full on the one year anniversary of the grant date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The Reporting Person held the options and underlying shares for the benefit of ATV Capital Management, Inc. 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Pursuant to the policy, the Reporting Person assigned these shares to ACM for no additional consideration."}],"balance_after":0,"derivative":{"exercise_price":27.97,"expiration_date":"2026-03-03","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001209191-19-039550","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919119039550/doc4.xml","form_type":"4"}},{"id":3475973,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to Purchase Common Stock","published_at":"2019-06-28T19:25:47.000Z","date":"2019-06-26","kind":"exercise","acquired":false,"shares":20000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The shares of common stock underlying this stock option award vested in equal quarterly installments over the first three years after the grant."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The Reporting Person held the options and underlying shares for the benefit of ATV Capital Management, Inc. 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The Reporting Person disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001209191-19-039550","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919119039550/doc4.xml","form_type":"4"}},{"id":3475971,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-06-28T19:25:47.000Z","date":"2019-06-26","kind":"other","acquired":true,"shares":11812,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"The Reporting Person held the options and underlying shares for the benefit of ATV Capital Management, Inc. 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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 purchased at each separate price within the ranges set forth in footnotes (2) and (5) to this Form 4."}],"balance_after":15562,"source":{"system":"sec-edgar","filing":"0001209191-19-039550","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919119039550/doc4.xml","form_type":"4"}},{"id":3475968,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-06-28T19:25:47.000Z","date":"2019-06-26","kind":"exercise","acquired":true,"shares":7500,"price":30.17,"value":226275.0,"ownership":{"direct":true},"balance_after":41250,"source":{"system":"sec-edgar","filing":"0001209191-19-039550","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919119039550/doc4.xml","form_type":"4"}},{"id":3475967,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-06-28T19:25:47.000Z","date":"2019-06-26","kind":"exercise","acquired":true,"shares":10000,"price":27.97,"value":279700.0,"ownership":{"direct":true},"balance_after":33750,"source":{"system":"sec-edgar","filing":"0001209191-19-039550","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919119039550/doc4.xml","form_type":"4"}},{"id":3475966,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-06-28T19:25:47.000Z","date":"2019-06-26","kind":"exercise","acquired":true,"shares":20000,"price":24.11,"value":482200.0,"ownership":{"direct":true},"balance_after":23750,"source":{"system":"sec-edgar","filing":"0001209191-19-039550","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919119039550/doc4.xml","form_type":"4"}},{"id":3504704,"issuer":{"id":113073,"kind":"organization","name":"Calithera Biosciences, Inc.","symbol":"CALA"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2019-06-03T16:05:34.000Z","date":"2019-05-30","kind":"grant","acquired":true,"shares":11000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/12 of the Option vests in each monthly installment as measured from May 30, 2019, until the earlier of the Option's full vesting or the reporting person ceasing to provide continuous service to the issuer.  In addition, in the event of a Change in Control or a Corporate Transaction (each as defined in the plan pursuant to which the Option was granted), any unvested portion of the Option will fully vest and become exercisable as of immediately prior to the effective time of such Change in Control or Corporate Transaction, subject to the reporting person's continuous service on the effective date of such transaction."}],"balance_after":11000,"derivative":{"exercise_price":5.42,"expiration_date":"2029-05-29","underlying":"Common Stock","underlying_shares":11000},"source":{"system":"sec-edgar","filing":"0000899243-19-015380","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1496671/000089924319015380/doc4.xml","form_type":"4"}},{"id":3683716,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to Purchase Common Stock","published_at":"2019-01-29T17:45:29.000Z","date":"2019-01-25","kind":"grant","acquired":true,"shares":7500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares of common stock underlying this stock option award vest in full on the one year anniversary of the grant date."}],"balance_after":7500,"derivative":{"exercise_price":41.64,"expiration_date":"2029-01-25","underlying":"Common Stock","underlying_shares":7500},"source":{"system":"sec-edgar","filing":"0001179110-19-001059","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000117911019001059/edgar.xml","form_type":"4"}},{"id":3683715,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-01-29T17:45:29.000Z","date":"2019-01-25","kind":"grant","acquired":true,"shares":1250,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":3750,"source":{"system":"sec-edgar","filing":"0001179110-19-001059","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000117911019001059/edgar.xml","form_type":"4"}},{"id":3901556,"issuer":{"id":68888,"kind":"organization","name":"Astria Therapeutics, Inc.","symbol":"ATXS"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2018-06-07T18:04:23.000Z","date":"2018-06-07","kind":"grant","acquired":true,"shares":14000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option was granted on June 7, 2018 and is scheduled to vest on June 7, 2019."}],"balance_after":14000,"derivative":{"exercise_price":1.48,"expiration_date":"2028-06-06","underlying":"Common Stock","underlying_shares":14000},"source":{"system":"sec-edgar","filing":"0001179110-18-008241","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1454789/000117911018008241/edgar.xml","form_type":"4"}},{"id":3908387,"issuer":{"id":113073,"kind":"organization","name":"Calithera Biosciences, Inc.","symbol":"CALA"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2018-06-04T16:06:55.000Z","date":"2018-05-31","kind":"grant","acquired":true,"shares":11000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/12 of the Option vests in each monthly installment as measured from May 31, 2018, until the earlier of the Option's full vesting or the reporting person ceasing to provide continuous service to the issuer.  In addition, in the event of a Change in Control or a Corporate Transaction (each as defined in the plan pursuant to which the Option was granted), any unvested portion of the Option will fully vest and become exercisable as of immediately prior to the effective time of such Change in Control or Corporate Transaction, subject to the reporting person's continuous service on the effective date of such transaction."}],"balance_after":11000,"derivative":{"exercise_price":5.15,"expiration_date":"2028-05-30","underlying":"Common Stock","underlying_shares":11000},"source":{"system":"sec-edgar","filing":"0000899243-18-014884","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1496671/000089924318014884/doc4.xml","form_type":"4"}},{"id":4014597,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to Purchase Common Stock","published_at":"2018-03-05T17:19:22.000Z","date":"2018-03-01","kind":"grant","acquired":true,"shares":7500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares of common stock underlying this stock option award vest in full on the one year anniversary of the grant date."}],"balance_after":7500,"derivative":{"exercise_price":40.61,"expiration_date":"2028-03-01","underlying":"Common Stock","underlying_shares":7500},"source":{"system":"sec-edgar","filing":"0001179110-18-003501","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000117911018003501/edgar.xml","form_type":"4"}},{"id":4014596,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2018-03-05T17:19:22.000Z","date":"2018-03-01","kind":"grant","acquired":true,"shares":1250,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":2500,"source":{"system":"sec-edgar","filing":"0001179110-18-003501","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000117911018003501/edgar.xml","form_type":"4"}},{"id":4128432,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-12-18T16:53:03.000Z","date":"2017-12-15","kind":"sale","acquired":false,"shares":105122,"price":35.73,"value":3756009.06,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Includes 98,674 shares, 3,959 shares, 1,902 shares and 587 shares of common stock sold by Advanced Technology Ventures VII, L.P. (\"ATV VII\"), Advanced Technology Ventures VII (B), L.P. (\"ATV VII B\"), Advanced Technology Ventures VII (C), L.P. (\"ATV VII C\") and ATV Entrepreneurs VII, L.P. (\"ATV VII E\"), respectively."},{"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 $35.99 - $36.10, 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 footnote (2) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"ATV Associates VII, L.L.C. (\"ATV A VII\") is the general partner of ATV VII, ATV VII B, ATV VII C and ATV VII E and exercises voting and dispositive authority over the shares held by ATV VII, ATV VII B, ATV VII C and ATV VII E. Jean George is a managing director of ATV A VII and exercises voting and dispositive decisions of ATV A VII collectively with each of four other managing directors. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001209191-17-066163","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919117066163/doc4.xml","form_type":"4"}},{"id":4249374,"issuer":{"id":68888,"kind":"organization","name":"Astria Therapeutics, Inc.","symbol":"ATXS"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2017-07-28T16:03:25.000Z","date":"2017-07-27","kind":"grant","acquired":true,"shares":6500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option was granted on July 27, 2017 and is scheduled to vest in full on June 7, 2018."}],"balance_after":6500,"derivative":{"exercise_price":1.27,"expiration_date":"2027-07-26","underlying":"Common Stock","underlying_shares":6500},"source":{"system":"sec-edgar","filing":"0001179110-17-010769","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1454789/000117911017010769/edgar.xml","form_type":"4"}},{"id":4283845,"issuer":{"id":113073,"kind":"organization","name":"Calithera Biosciences, Inc.","symbol":"CALA"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2017-06-13T16:35:38.000Z","date":"2017-06-09","kind":"grant","acquired":true,"shares":11000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/12 of the Option vests in each monthly installment as measured from June 9, 2017, until the earlier of the Option's full vesting or the reporting person ceasing to provide continuous service to the issuer.  In addition, in the event of a Change in Control or a Corporate Transaction (each as defined in the plan pursuant to which the Option was granted), any unvested portion of the Option will fully vest and become exercisable as of immediately prior to the effective time of such Change in Control or Corporate Transaction, subject to the reporting person's continuous service on the effective date of such transaction."}],"balance_after":11000,"derivative":{"exercise_price":14.2,"expiration_date":"2027-06-08","underlying":"Common Stock","underlying_shares":11000},"source":{"system":"sec-edgar","filing":"0000899243-17-016233","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1496671/000089924317016233/doc4.xml","form_type":"4"}},{"id":4386146,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to Purchase Common Stock","published_at":"2017-03-14T18:20:06.000Z","date":"2017-03-02","kind":"grant","acquired":true,"shares":7500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The shares of common stock underlying this stock option award vest in full on the one year anniversary of the grant date."}],"balance_after":7500,"derivative":{"exercise_price":30.17,"expiration_date":"2027-03-02","underlying":"Common Stock","underlying_shares":7500},"source":{"system":"sec-edgar","filing":"0001179110-17-004594","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000117911017004594/edgar.xml","form_type":"4"}},{"id":4386145,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-03-14T18:20:06.000Z","date":"2017-03-02","kind":"grant","acquired":true,"shares":1250,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":1250,"source":{"system":"sec-edgar","filing":"0001179110-17-004594","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000117911017004594/edgar.xml","form_type":"4"}},{"id":4516876,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Warrants to Purchase Common Stock","published_at":"2016-12-19T16:05:32.000Z","date":"2016-12-07","kind":"exercise","acquired":false,"shares":127122,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 119,322 shares, 4,788 shares, 2,301 shares and 711 shares of common stock underlying warrants held by Advanced Technology Ventures VII, L.P. (\"ATV VII\"), Advanced Technology Ventures VII (B), L.P. (\"ATV VII B\"), Advanced Technology Ventures VII (C), L.P. (\"ATV VII C\") and ATV Entrepreneurs VII, L.P. (\"ATV VII E\"), respectively.  Shares ultimately received by each of these entities were net of shares withheld, as described in footnote 3, due to the net exercise of warrants."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The warrants to purchase common stock were exercisable at any time at the holders' election."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F1","text":"Represents 119,322 shares, 4,788 shares, 2,301 shares and 711 shares of common stock underlying warrants held by Advanced Technology Ventures VII, L.P. (\"ATV VII\"), Advanced Technology Ventures VII (B), L.P. (\"ATV VII B\"), Advanced Technology Ventures VII (C), L.P. (\"ATV VII C\") and ATV Entrepreneurs VII, L.P. (\"ATV VII E\"), respectively.  Shares ultimately received by each of these entities were net of shares withheld, as described in footnote 3, due to the net exercise of warrants."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"ATV Associates VII, L.L.C. (\"ATV A VII\") is the general partner of ATV VII, ATV VII B, ATV VII C and ATV VII E and exercises voting and dispositive authority over the shares held by ATV VII, ATV VII B, ATV VII C and ATV VII E. Jean George is a managing director of ATV A VII and exercises voting and dispositive decisions of ATV A VII collectively with each of four other managing directors. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."}],"balance_after":0,"derivative":{"exercise_price":5.88,"expiration_date":"2020-06-10","underlying":"Common Stock","underlying_shares":127122},"source":{"system":"sec-edgar","filing":"0001209191-16-155873","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919116155873/doc4.xml","form_type":"4"}},{"id":4516875,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2016-12-19T16:05:32.000Z","date":"2016-12-07","kind":"tax_withholding","acquired":false,"shares":22000,"price":33.98,"value":747560.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Represents 20,648 shares, 829 shares, 399 shares and 124 shares of common stock withheld in connection with the net exercise of warrants by ATV VII, ATV VII B, ATV VII V and ATV VII E, respectively.  Such shares were withheld by the issuer in satisfaction of the warrants' exercise price and did not involve the sale of shares by the holders."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"ATV Associates VII, L.L.C. (\"ATV A VII\") is the general partner of ATV VII, ATV VII B, ATV VII C and ATV VII E and exercises voting and dispositive authority over the shares held by ATV VII, ATV VII B, ATV VII C and ATV VII E. Jean George is a managing director of ATV A VII and exercises voting and dispositive decisions of ATV A VII collectively with each of four other managing directors. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."}],"balance_after":105122,"source":{"system":"sec-edgar","filing":"0001209191-16-155873","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919116155873/doc4.xml","form_type":"4"}},{"id":4516874,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2016-12-19T16:05:32.000Z","date":"2016-12-07","kind":"exercise","acquired":true,"shares":127122,"price":5.88,"value":747477.36,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 119,322 shares, 4,788 shares, 2,301 shares and 711 shares of common stock underlying warrants held by Advanced Technology Ventures VII, L.P. (\"ATV VII\"), Advanced Technology Ventures VII (B), L.P. (\"ATV VII B\"), Advanced Technology Ventures VII (C), L.P. (\"ATV VII C\") and ATV Entrepreneurs VII, L.P. (\"ATV VII E\"), respectively.  Shares ultimately received by each of these entities were net of shares withheld, as described in footnote 3, due to the net exercise of warrants."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"ATV Associates VII, L.L.C. (\"ATV A VII\") is the general partner of ATV VII, ATV VII B, ATV VII C and ATV VII E and exercises voting and dispositive authority over the shares held by ATV VII, ATV VII B, ATV VII C and ATV VII E. Jean George is a managing director of ATV A VII and exercises voting and dispositive decisions of ATV A VII collectively with each of four other managing directors. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."}],"balance_after":127122,"source":{"system":"sec-edgar","filing":"0001209191-16-155873","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919116155873/doc4.xml","form_type":"4"}},{"id":4548599,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2016-11-18T16:34:57.000Z","date":"2016-11-17","kind":"sale","acquired":false,"shares":379464,"price":38.05,"value":14438605.2,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F9","text":"Represents 355,491 shares, 14,265 shares, 6,857 shares, 2,118 shares and 733 shares that were held directly, and sold, by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"ATV Associates VII, L.L.C. (\"ATV A VII\") is the general partner of ATV VII, ATV VII B, ATV VII C and ATV VII E and exercises voting and dispositive authority over the shares held by ATV VII, ATV VII B, ATV VII C and ATV VII E. Jean George is a managing director of ATV A VII and exercises voting and dispositive decisions of ATV A VII collectively with each of four other managing directors. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"ATV Alliance Associates, L.L.C. (\"ATV Alliance LLC\") is the general partner of ATV 2003 and exercises voting and dispositive authority over the shares held by ATV 2003. Voting and dispositive decisions of ATV Alliance LLC are made by Ms. George. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001209191-16-151236","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919116151236/doc4.xml","form_type":"4"}},{"id":4548598,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2016-11-18T16:34:57.000Z","date":"2016-11-17","kind":"sale","acquired":false,"shares":41112,"price":39.13,"value":1608712.56,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F6","text":"Represents 38,515 shares, 1,546 shares, 743 shares, 229 shares and 79 shares that were held directly, and sold, by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"Represents weighted average price. The shares were sold at prices ranging from $39.05 to 39.56. The reporting person will provide upon request, to the SEC, the Issuer or any security holder of the Issuer, full information regarding the number of shares sold at each separate price."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F8","text":"Represents 355,491 shares, 14,265 shares, 6,857 shares, 2,118 shares and 733 shares held directly by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"ATV Associates VII, L.L.C. (\"ATV A VII\") is the general partner of ATV VII, ATV VII B, ATV VII C and ATV VII E and exercises voting and dispositive authority over the shares held by ATV VII, ATV VII B, ATV VII C and ATV VII E. Jean George is a managing director of ATV A VII and exercises voting and dispositive decisions of ATV A VII collectively with each of four other managing directors. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"ATV Alliance Associates, L.L.C. (\"ATV Alliance LLC\") is the general partner of ATV 2003 and exercises voting and dispositive authority over the shares held by ATV 2003. Voting and dispositive decisions of ATV Alliance LLC are made by Ms. George. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."}],"balance_after":379464,"source":{"system":"sec-edgar","filing":"0001209191-16-151236","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919116151236/doc4.xml","form_type":"4"}},{"id":4548597,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2016-11-18T16:34:57.000Z","date":"2016-11-16","kind":"sale","acquired":false,"shares":32929,"price":41.39,"value":1362931.31,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 30,849 shares, 1,238 shares, 595 shares, 184 shares and 63 shares that were held directly, and sold, by Advanced Technology Ventures VII, L.P. (\"ATV VII\"), Advanced Technology Ventures VII (B), L.P. (\"ATV VII B\"), Advanced Technology Ventures VII (C), L.P. (\"ATV VII C\"), ATV Entrepreneurs VII, L.P. (\"ATV VII E\") and ATV Alliance 2003, L.P. (\"ATV 2003\"), respectively."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents weighted average price. The shares were sold at prices ranging from $41.31 to $41.47. The reporting person will provide upon request, to the SEC, the Issuer or any security holder of the Issuer, full information regarding the number of shares sold at each separate price."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 394,006 shares, 15,811 shares, 7,600 shares, 2,347 shares and 812 shares held directly by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"ATV Associates VII, L.L.C. (\"ATV A VII\") is the general partner of ATV VII, ATV VII B, ATV VII C and ATV VII E and exercises voting and dispositive authority over the shares held by ATV VII, ATV VII B, ATV VII C and ATV VII E. Jean George is a managing director of ATV A VII and exercises voting and dispositive decisions of ATV A VII collectively with each of four other managing directors. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"ATV Alliance Associates, L.L.C. (\"ATV Alliance LLC\") is the general partner of ATV 2003 and exercises voting and dispositive authority over the shares held by ATV 2003. Voting and dispositive decisions of ATV Alliance LLC are made by Ms. George. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."}],"balance_after":420576,"source":{"system":"sec-edgar","filing":"0001209191-16-151236","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919116151236/doc4.xml","form_type":"4"}},{"id":4586530,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":76913,"kind":"person","name":"George Jean","position":1,"cik":"0001291804","reported_name":"George Jean","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2016-10-04T19:37:25.000Z","date":"2016-09-30","kind":"sale","acquired":false,"shares":857145,"price":35.5,"value":30428647.5,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 802,998 shares, 32,222 shares, 15,489 shares, 4,783 shares and 1,653 shares that were held directly, and sold, by Advanced Technology Ventures VII, L.P. (\"ATV VII\"), Advanced Technology Ventures VII (B), L.P. (\"ATV VII B\"), Advanced Technology Ventures VII (C), L.P. (\"ATV VII C\"), ATV Entrepreneurs VII, L.P. (\"ATV VII E\") and ATV Alliance 2003, L.P. (\"ATV 2003\"), respectively."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents 424,855 shares, 17,049 shares, 8,195 shares, 2,531 shares and 875 shares held directly by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"ATV Associates VII, L.L.C. (\"ATV A VII\") is the general partner of ATV VII, ATV VII B, ATV VII C and ATV VII E and exercises voting and dispositive authority over the shares held by ATV VII, ATV VII B, ATV VII C and ATV VII E. Jean George is a managing director of ATV A VII and exercises voting and dispositive decisions of ATV A VII collectively with each of four other managing directors. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"ATV Alliance Associates, L.L.C. (\"ATV Alliance LLC\") is the general partner of ATV 2003 and exercises voting and dispositive authority over the shares held by ATV 2003. Voting and dispositive decisions of ATV Alliance LLC are made by Ms. George. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein."}],"balance_after":453505,"source":{"system":"sec-edgar","filing":"0001209191-16-144718","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1291804/000120919116144718/doc4.xml","form_type":"4"}}]}