MCRB · Seres Therapeutics, Inc. · Insider Trading

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 instruction adopted by the reporting person on March 2, 2023, solely with the intent to cover taxes in connection with the vesting of the restricted stock units.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 plan adopted by the reporting person on November 26, 2025, with the intent to cover taxes in connection with the vesting of the restricted stock units.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 instruction adopted by the reporting person on April 13, 2023, solely with the intent to cover taxes in connection with the vesting of the restricted stock units.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 instruction adopted by the reporting person on March 2, 2023, solely with the intent to cover taxes in connection with the vesting of the restricted stock units.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2024. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2025. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2024. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2025. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2024. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2025. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2025. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2024. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

The option will vest as to 25% of the shares on March 2, 2027. The remainder of the shares will vest in 12 equal quarterly installments thereafter.

The option will vest as to 25% of the shares on March 2, 2027. The remainder of the shares will vest in 12 equal quarterly installments thereafter.

The option will vest as to 25% of the shares on March 2, 2027. The remainder of the shares will vest in 12 equal quarterly installments thereafter.

The option will vest as to 25% of the shares on March 2, 2027. The remainder of the shares will vest in 12 equal quarterly installments thereafter.

The option vests and becomes exercisable on the earlier to occur of (i) July 8, 2027 or (ii) the day immediately prior to the first annual meeting of the Company's stockholders occurring after July 8, 2026.

The option vests and becomes exercisable on the earlier to occur of (i) July 8, 2027 or (ii) the day immediately prior to the first annual meeting of the Company's stockholders occurring after July 8, 2026.

The option vests and becomes exercisable on the earlier to occur of (i) July 8, 2027 or (ii) the day immediately prior to the first annual meeting of the Company's stockholders occurring after July 8, 2026.

The option vests and becomes exercisable in 36 equal monthly installments following the March 2, 2026 vesting commencement date.

The option vests and becomes exercisable on the earlier to occur of (i) July 8, 2027 or (ii) the day immediately prior to the first annual meeting of the Company's stockholders occurring after July 8, 2026.

The option vests and becomes exercisable on the earlier to occur of (i) July 8, 2027 or (ii) the day immediately prior to the first annual meeting of the Company's stockholders occurring after July 8, 2026.

The option vests and becomes exercisable on the earlier to occur of (i) July 8, 2027 or (ii) the day immediately prior to the first annual meeting of the Company's stockholders occurring after July 8, 2026.

The option vests and becomes exercisable on the earlier to occur of (i) July 8, 2027 or (ii) the day immediately prior to the first annual meeting of the Company's stockholders occurring after July 8, 2026.

The option vests and becomes exercisable in four equal quarterly installments occurring on October 1, 2026, January 1, 2027, April 1, 2027, and July 1, 2027, provided that if the issuer's 2027 annual meeting of stockholders occurs before July 1, 2027, the final quarterly vesting installment will vest on the day immediately prior to the date of such annual meeting, in each case, subject to the reporting person continuing in service on the Board as a non-employee director through the applicable vesting date.

The option vests and becomes exercisable in four equal quarterly installments occurring on October 1, 2026, January 1, 2027, April 1, 2027, and July 1, 2027, provided that if the issuer's 2027 annual meeting of stockholders occurs before July 1, 2027, the final quarterly vesting installment will vest on the day immediately prior to the date of such annual meeting, in each case, subject to the reporting person continuing in service on the Board as a non-employee director through the applicable vesting date.

The option vests and becomes exercisable in four equal quarterly installments occurring on October 1, 2026, January 1, 2027, April 1, 2027, and July 1, 2027, provided that if the issuer's 2027 annual meeting of stockholders occurs before July 1, 2027, the final quarterly vesting installment will vest on the day immediately prior to the date of such annual meeting, in each case, subject to the reporting person continuing in service on the Board as a non-employee director through the applicable vesting date.

Represents shares sold to cover taxes in connection with the vesting of the restricted stock units.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 instruction adopted by the reporting person on March 2, 2023, solely with the intent to cover taxes in connection with the vesting of the restricted stock units.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 instruction adopted by the reporting person on April 13, 2023, solely with the intent to cover taxes in connection with the vesting of the restricted stock units.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 instruction adopted by the reporting person on March 2, 2023, solely with the intent to cover taxes in connection with the vesting of the restricted stock units.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2025. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2025. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2024. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2025. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2024. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2024. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2025. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2024. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date.

The option will vest as to 25% of the shares on March 2, 2027. The remainder of the shares will vest in 12 equal quarterly installments thereafter.

The option will vest as to 25% of the shares on March 2, 2027. The remainder of the shares will vest in 12 equal quarterly installments thereafter.

The option vests and become exercisable in 36 equal monthly installments.