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Under the terms of the policy, the Reporting Person received an option to purchase 25,000 shares. Due to a clerical error, the original Form 4 filed on December 1, 2017 erroneously reported an option grant of 7,324 shares. This Amendment to Form 4 is filed solely to correct the share number."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option becomes exercisable as to 33.3333% of the shares underlying the award on the first anniversary of the date of grant, with the remainder vesting in equal monthly installments until the third anniversary of the date of grant, subject to the Reporting Person's continued service as a director through each applicable vesting date."}],"balance_after":25000,"derivative":{"exercise_price":10,"expiration_date":"2027-11-14","underlying":"Common Stock","underlying_shares":25000},"source":{"system":"sec-edgar","filing":"0001209191-18-016569","document":"doc4a.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1722061/000120919118016569/doc4a.xml","form_type":"4/A","original_submission_date":"2017-12-01"}},{"id":4146217,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":112281,"kind":"person","name":"Gerngross Tillman U.","position":1,"cik":"0001722061","reported_name":"Gerngross Tillman U.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2017-12-01T17:24:29.000Z","date":"2017-11-15","kind":"grant","acquired":true,"shares":7324,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Consists of an automatic stock option grant that was made on November 15, 2017, the date of the effectiveness of the registration statement for the issuer's initial public offering, under the issuer's director compensation program."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option becomes exercisable as to 33.3333% of the shares underlying the award on the first anniversary of the date of grant, with the remainder vesting in equal monthly installments until the third anniversary of the date of grant, subject to the Reporting Person's continued service as a director through each applicable vesting date."}],"balance_after":7324,"derivative":{"exercise_price":10,"expiration_date":"2027-11-14","underlying":"Common Stock","underlying_shares":7324},"source":{"system":"sec-edgar","filing":"0000899243-17-027831","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1722061/000089924317027831/doc4.xml","form_type":"4"}},{"id":4156621,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":112281,"kind":"person","name":"Gerngross Tillman U.","position":1,"cik":"0001722061","reported_name":"Gerngross Tillman U.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series D Convertible Preferred Stock","published_at":"2017-11-20T17:32:52.000Z","date":"2017-11-20","kind":"exercise","acquired":false,"shares":308099,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":90272},"source":{"system":"sec-edgar","filing":"0000899243-17-027004","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1722061/000089924317027004/doc4.xml","form_type":"4"}},{"id":4156620,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":112281,"kind":"person","name":"Gerngross Tillman U.","position":1,"cik":"0001722061","reported_name":"Gerngross Tillman U.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-11-20T17:32:52.000Z","date":"2017-11-20","kind":"purchase","acquired":true,"shares":200000,"price":10,"value":2000000.0,"ownership":{"direct":true},"balance_after":392821,"source":{"system":"sec-edgar","filing":"0000899243-17-027004","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1722061/000089924317027004/doc4.xml","form_type":"4"}},{"id":4156619,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":112281,"kind":"person","name":"Gerngross Tillman U.","position":1,"cik":"0001722061","reported_name":"Gerngross Tillman U.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-11-20T17:32:52.000Z","date":"2017-11-20","kind":"exercise","acquired":true,"shares":90272,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."}],"balance_after":192821,"source":{"system":"sec-edgar","filing":"0000899243-17-027004","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1722061/000089924317027004/doc4.xml","form_type":"4"}}]}