SYNLOGIC, INC. — Director's Dealing 2015

Oct 7, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Mirna Therapeutics, Inc. (MIRN)
CIK: 0001527599
Period of Report: 2015-10-05

Reporting Person: PFIZER INC (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-10-05	Common Stock	C	1539224.0000	—	Acquired	1539224.0000	Direct
2015-10-06	Common Stock	P	714285.0000	$7.0000	Acquired	2253509.0000	Direct
2015-10-06	Common Stock	J	235855.0000	$7.0000	Acquired	2489364.0000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-10-05	Series C Convertible Preferred Stock	$	C	1047806.0000	Disposed		Common Stock (1047806.0000)	Direct
2015-10-05	Series D Convertible Preferred Stock	$	C	491418.0000	Disposed		Common Stock (491418.0000)	Direct

Footnotes

F1: Each share of the issuer's Series C Convertible and Series D Convertible Preferred Stock converted into Common Stock of the issuer on a 1-to-1 basis immediately prior to the closing of the issuer's initial public offering, and has no expiration date.

F2: The reporting person received 235,855 shares of Common Stock as a payment-in-kind dividend in connection with the conversion of the reporting person's Series C Convertible and Series D Convertible Preferred Stock into shares of Common Stock.