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Seres Therapeutics, Inc. Information Request Form

Levi & Korsinsky announces it has commenced an investigation of Seres Therapeutics, Inc. (NASDAQGS: MCRB) (“Seres”) concerning possible violations of federal securities laws by the Company and/or certain of its officers and directors.

On July 29, 2016, the Company announced that its Phase 2 clinical study for ECOSPOR did not meet its primary endpoint. Following this news, Seres shares opened trading down 76% on August 1, 2016. Two days before the announcement, on July 27, 2016, Seres’ President, Chief Executive Officer, and Chairman of the Board sold 20,000 shares at $35 per share for gross proceeds of $700,000.

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This submission does not create an attorney-client relationship. If we believe that you might be an appropriate lead plaintiff, we will contact you to discuss whether to establish an attorney-client relationship.

This letter confirms that you have retained Levi & Korsinsky, LLP to represent you as a named plaintiff in a shareholder action involving Seres Therapeutics, Inc.

We agree to advance all expenses in the litigation, which means that you are not liable to pay any of the expenses of the lawsuit, whether attorneys' fees or costs. Regardless of the result, we will never ask you to directly pay for any attorneys' fees or costs. Should we obtain a favorable result, we may ask the court to award us compensation to be paid by the defendants or as a portion of any class benefit, but, again, we will never ask you to directly pay any of the costs of this litigation.

As the client you are entitled to direct the litigation in any way you deem proper, and may at any time order us to dismiss the case or opt-out. Should you choose to do so, we will never ask you to reimburse us directly for any legal fees or expenses. During the course of this litigation, we may employ and/or work with other law firms to prosecute your case.

We look forward to representing you and other Seres Therapeutics, Inc. shareholders.

Sincerely,

Levi & Korsinsky,LLP

Joseph Levi

AGREED: Sign Name Clear