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Delaware		001-37566		26-1824804
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification No.)

301 Binney St., Suite 402 Cambridge, MA	02142
(Address of principal executive offices)	(Zip Code)

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock	SYBX	The Nasdaq Capital Market

	SYNLOGIC, INC.
Date:    May 9, 2019	By:	/s/ Todd Shegog
	Name:	Todd Shegog
	Title:	Chief Financial Officer

Exhibit 99.1

Synlogic Reports First Quarter 2019 Financial Results and Provides Business Update

– Company will host a conference call and webcast at 5:00 pm ET today –

CAMBRIDGE, Mass.--(BUSINESS WIRE)--May 9, 2019--Synlogic, Inc. (Nasdaq: SYBX), a clinical stage company applying synthetic biology to beneficial microbes to develop novel, living medicines, today reported its financial results for the first quarter ended March 31, 2019.

“We made significant progress on our 2019 goals in the first quarter of the year providing a strong foundation for the continued development of our Synthetic Biotic™ platform and clinical pipeline,” said Aoife Brennan, M.B., Ch.B. Synlogic’s president and chief executive officer. “We strengthened our scientific leadership with the appointment of two experienced drug developers, Dr. Scott Plevy, as Chief Scientific Officer, and Dr. Patricia Hurter, who joined our board of directors and brings additional relevant experience in manufacturing. In addition, we have manufactured clinical trial material in-house for our IO program and made significant advances in developing processes to reliably and reproducibly manufacture solid formulations of our orally administered Synthetic Biotic medicines. The new formulation has a more patient-friendly stability profile and provides a path to longer out-patient studies and eventual commercialization.”

Recent Highlights

Corporate

• Appointment of Scott Plevy, M.D., as Synlogic’s Chief Scientific Officer. Dr. Plevy has responsibility for Synlogic’s research organization. He most recently served as Vice President, Gastroenterology Disease Area Leader and IL-23 Pathway Leader at Janssen Research & Development, LLC, after a successful career in academia. He has served as the lead investigator on multiple early-phase clinical trials, published on a breadth of topics from disease-specific targets to basic immunology and molecular biology, and performed translational research to advance the understanding of novel immunologic interventions in inflammatory bowel disease, other inflammatory conditions, and microbiome-related diseases.
• Appointment of Patricia N. Hurter, Ph.D., to Synlogic’s board of directors. Dr. Hurter served as Senior Vice President at Vertex from 2011 to 2019, during which time her responsibilities grew to include all CMC and preclinical development activities of Vertex’s R&D portfolio, as well as the internal GMP manufacturing facility that provides drug substance and product for clinical development and commercial supply. Dr. Hurter also served as Interim Head of Global Regulatory Affairs at Vertex and played a leadership role in the development and commercialization of four transformative therapies for Vertex. Prior to joining Vertex, Dr. Hurter was Director, Formulation Design and Characterization for Merck.

Pipeline

• Presentation of data at the Annual Meeting of the American Society of Gene and Cell Therapy (ASGCT) demonstrating the development of a robust and reproducible process to generate a solid oral formulation of Synlogic’s Synthetic Biotic medicine for future studies and potential commercial use. The ASGCT presentation focused on preparation and characteristics of a solid oral preparation of SYNB1618, Synlogic’s Synthetic Biotic medicine for the treatment of phenylketonuria (PKU). The data demonstrate that Synlogic has developed a robust and reproducible process to generate a solid formulation of SYNB1618 with minimal impact on cell viability and phenylalanine consuming activity compared to a liquid formulation that is currently being evaluated in an ongoing Phase 1 /2a clinical study in patients with PKU. Synlogic expects to have data from the Phase 1 /2a study in patients in the third quarter of 2019.
• Publication in Science Translational Medicine of first in human clinical data and supporting preclinical data from investigational Synthetic Biotic candidate, SYNB1020. The data support the continued development of SYNB1020 which is currently being evaluated in a Phase 1b/2a clinical trial in patients with cirrhosis and elevated blood ammonia with data expected in the third quarter of 2019.
• In-house manufacturing of clinical trial material for Synlogic’s first immuno-oncology program, SYNB1891, a dual innate immune activator. Synlogic expects to file an investigational new drug (IND) application for SYNB1891 in the second half of 2019.
• Advancement of investigational Synthetic Biotic medicines to lead optimization stage in AbbVie collaboration. Synlogic and AbbVie are developing an oral treatment for inflammatory bowel disease (IBD).

First Quarter 2019 Financial Results

For the three months ended March 31, 2019, Synlogic reported a consolidated net loss of $12.9 million, or $0.51 per share, compared to a consolidated net loss of $11.2 million, or $0.55 per share, for the corresponding period in 2018. The increase in net loss was primarily due to increases in compensation-related expenses due to increased headcount, as well as increases in research and development expenses to support Synlogic’s advancing clinical programs.

Research and development expenses were $10.4 million for the three months ended March 31, 2019 compared to $8.4 million for the corresponding period in 2018. The increase was primarily due to an increase in compensation-related expenses associated with increased headcount and increased expenses associated with manufacturing and pre-clinical and clinical studies of Synlogic’s Synthetic Biotic programs.

General and administrative expenses for the three months ended March 31, 2019 were $3.7 million compared to $3.6 million for the corresponding period in 2018.

Revenue was $0.3 million for the three months ended March 31, 2019 compared to $0.4 million for the same period in 2018. Revenue for both periods is associated with services performed under Synlogic’s collaboration with AbbVie to develop a Synthetic Biotic medicine for the treatment of IBD.

As of March 31, 2019, Synlogic had cash, cash equivalents, and short-term investments of $109.8 million.

Conference Call & Webcast Information

Synlogic will host a conference call and live webcast today at 5:00 pm ET today, Thursday, May 9, 2019. To access the live webcast, please visit the “Event Calendar” page within the Investors and Media section of the Synlogic website. Alternatively, investors may listen to the call by dialing +1 (844) 815-2882 from locations in the United States or +1 (213) 660-0926 from outside the United States. The conference ID number is 2154739. For those unable to participate in the conference call or webcast, a replay will be available for 30 days on the Investors and Media section of the Synlogic website.

About Synlogic

Synlogic is pioneering the development of a novel class of living medicines, Synthetic Biotic medicines, based on its proprietary drug development platform. Synlogic leverages the tools and principles of synthetic biology to genetically engineer probiotic microbes to perform or deliver critical functions missing or damaged due to disease. The company’s two lead programs, SYNB1020 and SYNB1618, target hyperammonemia as a result of liver damage or genetic disease, and PKU, respectively. When delivered orally, Synthetic Biotic medicines can act from the gut to compensate for the dysfunctional metabolic pathway and have a systemic effect, with the potential to significantly improve symptoms of disease for affected patients. In addition, the company is leveraging the broad potential of its platform to create Synthetic Biotic medicines for the treatment of more common diseases, including liver disease, inflammatory and immune disorders, and cancer. Synlogic is collaborating with AbbVie to develop Synthetic Biotic-based treatments for inflammatory bowel disease (IBD). For more information, please visit www.synlogictx.com.

Forward-Looking Statements

This press release contains “forward-looking statements” that involve substantial risks and uncertainties for purposes of the safe harbor provided by the Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical facts, included in this press release regarding strategy, future operations, future financial position, future revenue, projected expenses, prospects, plans and objectives of management are forward-looking statements. In addition, when or if used in this press release, the words “may,” “could,” “should,” “anticipate,” “believe,” “estimate,” “expect,” “intend,” “plan,” “predict” and similar expressions and their variants, as they relate to Synlogic may identify forward-looking statements. Examples of forward-looking statements, include, but are not limited to, statements regarding the potential of Synlogic’s platform to develop therapeutics to address a wide range of diseases including: inborn errors of metabolism, liver disease, inflammatory and immune disorders, and cancer; the future clinical development of Synthetic Biotic medicines; the approach Synlogic is taking to discover and develop novel therapeutics using synthetic biology; the potential of Synlogic’s technology to treat hyperammonemia and phenylketonuria; and the expected timing of Synlogic’s anticipated clinical trial initiations. Actual results could differ materially from those contained in any forward-looking statement as a result of various factors, including: the uncertainties inherent in the preclinical development process; the ability of Synlogic to protect its intellectual property rights; and legislative, regulatory, political and economic developments, as well as those risks identified under the heading “Risk Factors” in Synlogic’s filings with the SEC. The forward-looking statements contained in this press release reflect Synlogic’s current views with respect to future events. Synlogic anticipates that subsequent events and developments will cause its views to change. However, while Synlogic may elect to update these forward-looking statements in the future, Synlogic specifically disclaims any obligation to do so. These forward-looking statements should not be relied upon as representing Synlogic’s view as of any date subsequent to the date hereof.

CONTACT:
MEDIA:
Synlogic
Courtney Heath
Phone: 617-872-2462
Email: courtney@scientpr.com

INVESTORS:
Synlogic
Elizabeth Wolffe, Ph.D.
Phone: 617-207-5509
Email: liz@synlogictx.com