Seres Therapeutics Inc

Second paragraph of Article FOURTH section A. 2. of the Certificate of Incorporation:

“The number of authorized shares of Common Stock may be increased or decreased (but not below the number of shares thereof then outstanding)by the affirmative without a separate vote oftheany holders ofa majority of the stock of the Corporation entitled to vote shares of Common Stock, irrespective of the provisions of Section 242(b)(2) of the General Corporation Law of the State of Delaware.”

Third paragraph of Article FOURTH section B. of the Certificate of Incorporation:

“Subject to the rights of the holders of any series of Preferred Stock pursuant to the terms of this Certificate of Incorporation or any resolution or resolutions providing for the issuance of such series of stock adopted by the Board of Directors, the number of authorized shares of Preferred Stock may be increased or decreased (but not below the number of shares thereof then outstanding)by the affirmative without a separate vote oftheany holders ofa majority of the stock of the Corporation entitled to vote shares of Preferred Stock, irrespective of the provisions of Section 242(b)(2) of the General Corporation Law of the State of Delaware.”