Synlogic is incorporated under the laws of the State of Delaware.

August 28,2017

The Company’s fiscal year runs January 1 through December 31.

Synlogic’s stock is publicly traded on the NASDAQ market under the symbol SYBX.

Synlogic does not currently offer a dividend reinvestment program and does not anticipate paying any cash dividends on common stock in the foreseeable future.

Equiniti Trust Company, LLC. 6201 15th Avenue, Brooklyn, NY 11219.

To take any of these actions regarding your Synlogic stock, please contact the Equiniti Trust Company, LLC, Synlogic’s transfer agent. Some of these requests may involve a fee.
Equiniti Trust Company, LLC
(800) 937-5449 (Toll-free)
(718) 921-8124 (International)
info@amstock.com

http://www.amstock.com/new/InvestorServices/ShareholderServices.aspx

Synlogic does not currently have a direct stock purchase plan.

KPMG LLP
One Broadway
Cambridge, MA 02142

Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C.
One Financial Center 
Boston, MA 02111

www.synlogictx.com

The latest corporate news releases and financial reports are available in the Investor and Media section of Synlogic’s IR website, where you can also sign up to receive email alerts for any updates.

Quarterly and annual reports, and all other SEC filings, can be found on the Financials & Filings section of our Investor Relations webpage or directly from the SEC at www.sec.gov.

You can find a complete list of our Management team and Board members under the "About Us" section of our site, or clicking on
Management Team and Board of Directors.

Further information about Synlogic can be found through the Company website; additional materials may be requested by contacting the Company directly at (617) 659-2802

You can submit questions to the Synlogic investor relations team by contacting
Investor@synlogictx.com