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As of the Effective Time, each Company Stock Option that was outstanding immediately prior to the Effective Time was cancelled, and, in exchange therefor, the holder of such cancelled Company Stock Option was entitled to receive (without interest), in consideration of the cancellation of such Company Stock Option, an amount in cash (less applicable tax withholdings) equal to the product of (x) the total number of Shares subject to such Company Stock Option immediately prior to the Effective Time multiplied by (y) the excess, if any, of the Offer Price over the applicable exercise price per Share under such Company Stock Option."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Pursuant to the terms of the Merger Agreement, at the Effective Time, each option to purchase Shares granted under an Issuer equity plan (each, a \"Company Stock Option\") that was outstanding and unvested immediately prior to the Effective Time vested in full. As of the Effective Time, each Company Stock Option that was outstanding immediately prior to the Effective Time was cancelled, and, in exchange therefor, the holder of such cancelled Company Stock Option was entitled to receive (without interest), in consideration of the cancellation of such Company Stock Option, an amount in cash (less applicable tax withholdings) equal to the product of (x) the total number of Shares subject to such Company Stock Option immediately prior to the Effective Time multiplied by (y) the excess, if any, of the Offer Price over the applicable exercise price per Share under such Company Stock Option."}],"balance_after":0,"derivative":{"exercise_price":115.53,"underlying":"Common Stock","underlying_shares":20896},"source":{"system":"sec-edgar","filing":"0001104659-21-142267","document":"tm2133601-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1796398/000110465921142267/tm2133601-3_4seq1.xml","form_type":"4"}},{"id":2500954,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":31000,"kind":"person","name":"Backstrom Jay T.","position":1,"cik":"0001796398","reported_name":"Backstrom Jay T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Research and Development"}}],"security":"Option to Purchase Common Stock","published_at":"2021-11-22T14:04:07.000Z","date":"2021-11-19","kind":"disposition_to_issuer","acquired":false,"shares":96963,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Pursuant to the terms of the Merger Agreement, at the Effective Time, each option to purchase Shares granted under an Issuer equity plan (each, a \"Company Stock Option\") that was outstanding and unvested immediately prior to the Effective Time vested in full. As of the Effective Time, each Company Stock Option that was outstanding immediately prior to the Effective Time was cancelled, and, in exchange therefor, the holder of such cancelled Company Stock Option was entitled to receive (without interest), in consideration of the cancellation of such Company Stock Option, an amount in cash (less applicable tax withholdings) equal to the product of (x) the total number of Shares subject to such Company Stock Option immediately prior to the Effective Time multiplied by (y) the excess, if any, of the Offer Price over the applicable exercise price per Share under such Company Stock Option."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Pursuant to the terms of the Merger Agreement, at the Effective Time, each option to purchase Shares granted under an Issuer equity plan (each, a \"Company Stock Option\") that was outstanding and unvested immediately prior to the Effective Time vested in full. As of the Effective Time, each Company Stock Option that was outstanding immediately prior to the Effective Time was cancelled, and, in exchange therefor, the holder of such cancelled Company Stock Option was entitled to receive (without interest), in consideration of the cancellation of such Company Stock Option, an amount in cash (less applicable tax withholdings) equal to the product of (x) the total number of Shares subject to such Company Stock Option immediately prior to the Effective Time multiplied by (y) the excess, if any, of the Offer Price over the applicable exercise price per Share under such Company Stock Option."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Pursuant to the terms of the Merger Agreement, at the Effective Time, each option to purchase Shares granted under an Issuer equity plan (each, a \"Company Stock Option\") that was outstanding and unvested immediately prior to the Effective Time vested in full. As of the Effective Time, each Company Stock Option that was outstanding immediately prior to the Effective Time was cancelled, and, in exchange therefor, the holder of such cancelled Company Stock Option was entitled to receive (without interest), in consideration of the cancellation of such Company Stock Option, an amount in cash (less applicable tax withholdings) equal to the product of (x) the total number of Shares subject to such Company Stock Option immediately prior to the Effective Time multiplied by (y) the excess, if any, of the Offer Price over the applicable exercise price per Share under such Company Stock Option."}],"balance_after":0,"derivative":{"exercise_price":52.61,"underlying":"Common Stock","underlying_shares":96963},"source":{"system":"sec-edgar","filing":"0001104659-21-142267","document":"tm2133601-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1796398/000110465921142267/tm2133601-3_4seq1.xml","form_type":"4"}},{"id":2500953,"issuer":{"id":15780,"kind":"organization","name":"ACCELERON PHARMA INC","symbol":"XLRN"},"owners":[{"id":31000,"kind":"person","name":"Backstrom Jay T.","position":1,"cik":"0001796398","reported_name":"Backstrom Jay T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, Research and Development"}}],"security":"Common Stock","published_at":"2021-11-22T14:04:07.000Z","date":"2021-11-19","kind":"other","acquired":false,"shares":21233,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This Form 4 reports securities disposed of pursuant to the terms of the Agreement and Plan of Merger (the \"Merger Agreement\"), dated as of September 29, 2021, by and among the Issuer, Merck Sharp & Dohme Corp. 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