{"transactions":[{"id":1547623,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2024-04-04T20:00:05.000Z","date":"2024-04-02","kind":"sale","planned":false,"acquired":false,"shares":372,"price":1.73,"value":643.56,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares sold by the reporting person on April 2, 2024 to cover the tax liability in connection with the vesting of three restricted stock awards, vesting on April 1, 2024, that were granted in 2020, 2021 and 2022."}],"balance_after":33859,"source":{"system":"sec-edgar","filing":"0000950170-24-041787","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000095017024041787/ownership.xml","form_type":"4"}},{"id":1741935,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"officer":true,"officer_title":"Chief Operating Officer"}}],"security":"Stock Option (right to buy)","published_at":"2023-11-15T00:22:51.000Z","date":"2023-11-10","kind":"grant","planned":false,"acquired":true,"shares":16666,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. 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Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The shares subject to this option vest in approximately equal monthly installments beginning on April 1, 2021 through April 1, 2025."}],"balance_after":0,"derivative":{"exercise_price":52.5,"expiration_date":"2031-03-10","underlying":"Common Stock","underlying_shares":4666},"source":{"system":"sec-edgar","filing":"0000950170-23-063925","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000095017023063925/ownership.xml","form_type":"4"}},{"id":1741924,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"officer":true,"officer_title":"Chief Operating Officer"}}],"security":"Stock Option (right to buy)","published_at":"2023-11-15T00:22:51.000Z","date":"2023-11-10","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":4666,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The shares subject to this option vest in approximately equal monthly installments beginning on July 1, 2020 through July 1, 2024."}],"balance_after":0,"derivative":{"exercise_price":27.75,"expiration_date":"2030-07-14","underlying":"Common Stock","underlying_shares":4666},"source":{"system":"sec-edgar","filing":"0000950170-23-063925","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000095017023063925/ownership.xml","form_type":"4"}},{"id":1741923,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"officer":true,"officer_title":"Chief Operating Officer"}}],"security":"Stock Option (right to buy)","published_at":"2023-11-15T00:22:51.000Z","date":"2023-11-10","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":4666,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The shares subject to this option vest in approximately equal monthly installments beginning on April 1, 2020 through April 1, 2024."}],"balance_after":0,"derivative":{"exercise_price":25.5,"expiration_date":"2030-03-10","underlying":"Common Stock","underlying_shares":4666},"source":{"system":"sec-edgar","filing":"0000950170-23-063925","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000095017023063925/ownership.xml","form_type":"4"}},{"id":1741922,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"officer":true,"officer_title":"Chief Operating Officer"}}],"security":"Stock Option (right to buy)","published_at":"2023-11-15T00:22:51.000Z","date":"2023-11-10","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":6666,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"These performance-based stock options, granted on March 16, 2023, vest when the achievement of certain clinical and regulatory development milestones are met."}],"balance_after":0,"derivative":{"exercise_price":9.3,"expiration_date":"2033-03-16","underlying":"Common Stock","underlying_shares":6666},"source":{"system":"sec-edgar","filing":"0000950170-23-063925","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000095017023063925/ownership.xml","form_type":"4"}},{"id":1741921,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"officer":true,"officer_title":"Chief Operating Officer"}}],"security":"Stock Option (right to buy)","published_at":"2023-11-15T00:22:51.000Z","date":"2023-11-10","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":666,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The shares subject to this option are fully vested as of the date hereof."}],"balance_after":0,"derivative":{"exercise_price":128.85,"expiration_date":"2029-03-05","underlying":"Common Stock","underlying_shares":666},"source":{"system":"sec-edgar","filing":"0000950170-23-063925","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000095017023063925/ownership.xml","form_type":"4"}},{"id":1741920,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"officer":true,"officer_title":"Chief Operating Officer"}}],"security":"Stock Option (right to buy)","published_at":"2023-11-15T00:22:51.000Z","date":"2023-11-10","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":3666,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In accordance with the terms of the Synlogic, Inc. 2015 Equity Incentive Award Plan and the Company's 2017 Stock Incentive Plan (together the \"Plans\"), the Board of Directors of Synlogic, Inc. approved a stock option repricing pursuant to which option awards granted under the Plans were amended to reduce the exercise price to $1.85 per share, the closing stock price of the Company's Common Stock on November 10, 2023. Except for the modified exercise price, all other terms and conditions of each of the option awards will continue as set forth in the Plan and the applicable award agreements."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The shares subject to this option are fully vested as of the date hereof."}],"balance_after":0,"derivative":{"exercise_price":130.35,"expiration_date":"2029-02-28","underlying":"Common Stock","underlying_shares":3666},"source":{"system":"sec-edgar","filing":"0000950170-23-063925","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000095017023063925/ownership.xml","form_type":"4"}},{"id":1924633,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2023-04-05T20:15:11.000Z","date":"2023-04-03","kind":"sale","planned":false,"acquired":false,"shares":6438,"price":0.5758,"value":3707.0004,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares sold by the reporting person on April 3, 2023 to cover the tax liability in connection with the vesting of three restricted stock awards, vesting on April 1, 2023, that were granted in 2020, 2021, and 2022."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.5750 to $0.5798, inclusive. The reporting person will provide to the staff of the Securities and Exchange Commission, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price."}],"balance_after":74732,"source":{"system":"sec-edgar","filing":"0000899243-23-010716","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000089924323010716/doc4.xml","form_type":"4"}},{"id":2302278,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2022-04-06T20:38:52.000Z","date":"2022-04-04","kind":"sale","acquired":false,"shares":2650,"price":2.4459,"value":6481.635,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares sold by the reporting person on April 4, 2022 to cover the tax liability in connection with the vesting of two restricted stock awards, vesting on April 1, 2022, that were granted in 2020 and 2021. The transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 23, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.40 to $2.45, inclusive. The reporting person will provide to the staff of the Securities and Exchange Commission, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price."}],"balance_after":81170,"source":{"system":"sec-edgar","filing":"0000899243-22-014109","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000089924322014109/doc4.xml","form_type":"4"}},{"id":2407957,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Stock Option (right to buy)","published_at":"2022-02-08T21:05:21.000Z","date":"2022-02-04","kind":"grant","acquired":true,"shares":165490,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option will vest and become exercisable in equal monthly installments for forty-eight months beginning on the date of the grant, which is February 4, 2022, subject to the Reporting Person continuing to provide services to the Issuer as Chief Operating Officer through each such vesting date."}],"balance_after":165490,"derivative":{"exercise_price":1.95,"expiration_date":"2032-02-04","underlying":"Common Stock","underlying_shares":165490},"source":{"system":"sec-edgar","filing":"0000899243-22-005207","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000089924322005207/doc4.xml","form_type":"4"}},{"id":2407956,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2022-02-08T21:05:21.000Z","date":"2022-02-04","kind":"grant","acquired":true,"shares":40820,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares of restricted stock were granted on February 4, 2022, and will vest beginning on April 1, 2022 (the \"Vesting Start Date\") in four equal annual installments on each anniversary of the Vesting Start Date, subject to the Reporting Person continuing to provide services to the Issuer as Chief Operating Officer through each such vesting date."}],"balance_after":83820,"source":{"system":"sec-edgar","filing":"0000899243-22-005207","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000089924322005207/doc4.xml","form_type":"4"}},{"id":2791253,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Stock Option (right to buy)","published_at":"2021-03-12T21:49:49.000Z","date":"2021-03-10","kind":"grant","acquired":true,"shares":70000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option will vest and become exercisable in equal monthly installments for forty-eight months beginning on April 1, 2021, with the first installment vesting on May 1, 2021, subject to the Reporting Person continuing to provide services to the Issuer as Chief Operating Officer through each such vesting date."}],"balance_after":70000,"derivative":{"exercise_price":3.5,"expiration_date":"2031-03-10","underlying":"Common Stock","underlying_shares":70000},"source":{"system":"sec-edgar","filing":"0000899243-21-011332","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000089924321011332/doc4.xml","form_type":"4"}},{"id":2791252,"issuer":{"id":7801,"kind":"organization","name":"SYNLOGIC, INC."},"owners":[{"id":92216,"kind":"person","name":"Awad Antoine","position":1,"cik":"0001820122","reported_name":"Awad Antoine","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2021-03-12T21:49:49.000Z","date":"2021-03-10","kind":"grant","acquired":true,"shares":17500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares of restricted stock were granted on March 10, 2021, and will vest beginning on April 1, 2021 (the \"Vesting Start Date\") in four equal annual installments on each anniversary of the Vesting Start Date, subject to the Reporting Person continuing to provide services to the Issuer as Chief Operating Officer through each such vesting date."}],"balance_after":43000,"source":{"system":"sec-edgar","filing":"0000899243-21-011332","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1527599/000089924321011332/doc4.xml","form_type":"4"}}]}