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SER-109 Phase 2 study enrollment complete; results expected in mid-2016

Academic collaborations further microbiome therapeutic leadership in immuno-oncology, rare genetic diseases and other indications

$120 million upfront payment obtained from Nestl茅 Health Science

CAMBRIDGE, Mass.--(BUSINESS WIRE)-- Seres Therapeutics Inc. (NASDAQ:MCRB), a leading microbiome therapeutics platform company, today reported first quarter 2016 financial results and provided an operational progress update.

鈥淭he first quarter was marked by strong progress extending our leadership position in the development of microbiome therapeutics,鈥� said Roger Pomerantz, M.D., President, CEO and Chairman of Seres. 鈥淥ur clinical-stage programs are advancing rapidly. Enrollment is now complete in our ongoing SER-109 Phase 2 study in recurrent Clostridium Difficile infection (CDI), and we look forward to study results in the middle of the year. Enrollment remains ongoing for the SER-287 Phase 1b study for ulcerative colitis. We have made excellent progress with SER-262, which we expect to be the first ever synthetic microbiome therapeutic candidate, and we expect to initiate a Phase 1b study in primary CDI in the middle of this year. The Company continues to be very active in collaborating with academic leaders to accelerate our efforts within our three focused franchises, infectious disease, inflammatory/immunology, and metabolic disease.鈥�

Recent Highlights:

Financial Results:

The Company reported a net loss of $19.7 million for the first quarter of 2016, as compared to a net loss of $8 million for the same period in 2015. The increase in net loss was driven primarily by continued growth in clinical and development spend as well as increased headcount, and ongoing development of our microbiome therapeutics platform.

In the first quarter, the Company recognized $2.7 million of the $120 million upfront payment received from an affiliate of Nestl茅 Health Science as revenue with the remaining $117.3 million recorded as deferred revenue at March 31, 2016. This deferred revenue amount, as well as future reimbursement for shared Phase 3 development expenses, will be recognized over the estimated 10-year collaboration development period. Potential additional development, regulatory, and commercial payments are expected to be recognized as revenue in the period in which the milestones are achieved. In addition, potential commercial royalties are expected to be recognized as revenue in the period in which they are earned.

Research and development expenses for the first quarter of 2016 were $15.4 million, as compared to $5.6 million for the same period in 2015. The increase in R&D expense was primarily due to expenses related to our microbiome therapeutics platform and the clinical development of SER-109, SER-262 and SER-287. General and administrative expenses for the first quarter were $7.2 million, as compared to $2.6 million for the same period in 2015. The increase in G&A expense was primarily due to increased headcount and facility expansion to support overall growth, as well as other costs associated with operating as a public company.

As of March 31, 2016, the Company had approximately $303 million in cash, cash equivalents and investments, which includes the $120 million upfront payment received from Nestl茅 Health Science. Cash usage during the quarter was $21.8 million compared to $9.9 million for the same period in 2015. This increase was driven primarily by expenses related to increased headcount and expanded R&D activities.

About Seres Therapeutics

Seres Therapeutics, Inc. is a leading microbiome therapeutics platform company developing a novel class of biological drugs that are designed to treat disease by restoring the function of a dysbiotic microbiome, where the natural state of bacterial diversity and function is imbalanced. Seres鈥� most advanced program, SER-109, has successfully completed a Phase 1b/2 study demonstrating a clinical benefit in patients with recurring Clostridium Difficile infection (CDI) and is currently being evaluated in a Phase 2 study in recurring CDI. The FDA has granted SER-109 Orphan Drug, as well as Breakthrough Therapy, designations. Seres鈥� second clinical candidate, SER-287, is being evaluated in a Phase 1b study in patients with mild-to-moderate ulcerative colitis (UC). For more information, please visit . Follow us on Twitter @SeresTx.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements contained in this press release that do not relate to matters of historical fact should be considered forward-looking statements, including without limitation statements regarding the sufficiency of the Company鈥檚 existing cash resources, the development of its various product candidates, the commercialization of its CDI therapeutic candidates, the timing and results of clinical trials, the value and impact of the agreement with Nestl茅, expected milestone payments under the agreement with Nestl茅 and potential benefits and outcomes of the Company鈥檚 collaborations with MSKCC, the University of Pennsylvania, St. Joseph鈥檚 Hamilton, Ontario and the Medical University of Graz.

These forward-looking statements are based on management鈥檚 current expectations. These statements are neither promises nor guarantees, but involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements, including, but not limited to, the following: we have incurred significant losses, are not currently profitable and may never become profitable; our need for additional funding, which may not be available; our limited operating history; the unpredictable nature of our early stage development efforts for marketable drugs; the unproven approach to therapeutic intervention of our microbiome therapeutics; the lengthy and expensive process of clinical drug development, which has an uncertain outcome; potential delays in enrollment of patients which could affect the receipt of necessary regulatory approvals; potential delays in regulatory approval, which would impact the ability to commercialize our product candidates and affect our ability to generate revenue; any fast track or Breakthrough Therapy designation may not lead to faster development, regulatory approval or marketing approval; our possible inability to receive orphan drug designation should we choose to seek it; our reliance on third parties to conduct our clinical trials and the potential for those third parties to not perform satisfactorily; our reliance on third parties to manufacture our product candidates, which may delay, prevent or impair our development and commercialization efforts; our lack of experience in manufacturing our product candidates; the potential failure of our product candidates to be accepted on the market by the medical community; our lack of experience selling, marketing and distributing products and our lack of internal capability to do so; failure to compete successfully against other drug companies; potential competition from biosimilars; failure to obtain marketing approval internationally; post-marketing restrictions or withdrawal from the market; anti-kickback, fraud, abuse, and other healthcare laws and regulations exposing us to potential criminal sanctions; recently enacted or future legislation; compliance with environmental, health, and safety laws and regulations; protection of our proprietary technology; protection of the confidentiality of our trade secrets; changes in United States patent law; potential lawsuits for infringement of third-party intellectual property; our patents being found invalid or unenforceable; compliance with patent regulations; claims challenging the inventorship or ownership of our patents and other intellectual property; claims asserting that we or our employees misappropriated a third-party鈥檚 intellectual property or otherwise claiming ownership of what we regard as our intellectual property; adequate protection of our trademarks; ability to attract and retain key executives; managing our growth could result in difficulties; risks associated with international operations; potential system failures; the price of our common stock may fluctuate substantially; our executive officers, directors, and principal stockholders have the ability to control all matters submitted to the stockholders; a significant portion of our total outstanding shares are eligible to be sold into the market; unfavorable or lacking analyst research or reports; and we may be subject to securities class action litigation. These and other important factors discussed under the caption 鈥淩isk Factors鈥� in our Annual Report on Form 10-K filed with the Securities and Exchange Commission, or SEC, on March 14, 2016 and our other reports filed with the SEC could cause actual results to differ materially from those indicated by the forward-looking statements made in this press release. Any such forward-looking statements represent management鈥檚 estimates as of the date of this press release. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this press release.