David Arkowitz - 01 Jun 2021 Form 4 Insider Report for Seres Therapeutics, Inc. (MCRB)

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MCRB	Stock Options (right to buy)	Award	$0	+270,000		$0.000000	270,000	01 Jun 2021	Common Stock	270,000	$20.19	Direct	F1
transaction	MCRB	Restricted Stock Units	Award	$0	+5,000		$0.000000	5,000	01 Jun 2021	Common Stock	5,000		Direct	F2, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Id	Content
F1	This option will vest and become exercisable as to 25% of the shares on June 1, 2022. The remainder of the shares will vest and become exercisable in 12 equal quarterly installments thereafter.
F2	Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.
F3	100% of the restricted stock units will vest and settle on June 15, 2022. The restricted stock units have no expiration date.