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The RSUs will vest in full on the earlier of (i) the one-year anniversary of the grant date or (ii) the Issuer's next annual meeting of stockholders, subject to continued board service through the applicable vesting date. 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The RSUs will vest in full on the earlier of (i) the one-year anniversary of the grant date or (ii) the Issuer's next annual meeting of stockholders, subject to continued board service through the applicable vesting date. 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The RSUs will vest in full on the earlier of (i) the one-year anniversary of the grant date or (ii) the Issuer?s next annual meeting of stockholders, subject to continued board service through the applicable vesting date. 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This amendment is being filed solely to report this additional stock option grant, which was granted automatically on March 13, 2019 pursuant to the Issuer's Director Compensation Policy upon such Reporting Person's election to the Board of Directors of the Issuer in connection with the closing of the Merger."}],"balance_after":6854,"derivative":{"exercise_price":18.66,"expiration_date":"2029-03-13","underlying":"Common Stock","underlying_shares":6854},"source":{"system":"sec-edgar","filing":"0000899243-19-009671","document":"doc4a.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000089924319009671/doc4a.xml","form_type":"4/A","original_submission_date":"2019-03-14"}},{"id":3567684,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":69829,"kind":"person","name":"Bridger Gary","position":1,"cik":"0001600049","reported_name":"Bridger Gary","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2019-04-03T00:04:07.000Z","date":"2019-03-13","kind":"grant","acquired":true,"shares":21570,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Reflects the Reporting Person's stock option to acquire 226,983 shares of X4 common stock for $0.99 per share that was assumed by the Issuer in the merger of Artemis AC Corp., a wholly-owned subsidiary of the Issuer, with and into X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.) 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(formerly X4 Pharmaceuticals, Inc.) 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