Bruce Keyt - 01 Jun 2021 Form 4 Insider Report for IGM Biosciences, Inc. (IGMS)

Role: Chief Scientific Officer
Signature: /s/ Misbah Tahir, by power of attorney
Issuer symbol: IGMS
Transactions as of: 01 Jun 2021
Net transactions value: -$196,604
Form type: 4
Filing time: 03 Jun 2021, 20:30:36 UTC
Previous filing: 18 May 2021
Next filing: 06 Jul 2021
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	IGMS	Common Stock	Options Exercise	$2,325	+2,500	+82%	$0.9300^*	5,557	01 Jun 2021	Direct	F1
transaction	IGMS	Common Stock	Tax liability	$100,387	-1,255	-23%	$79.99^*	4,302	01 Jun 2021	Direct	F2
transaction	IGMS	Common Stock	Sale	$98,542	-1,245	-29%	$79.15^*	3,057	02 Jun 2021	Direct	F1
holding	IGMS	Common Stock						1,013	01 Jun 2021	See footnote	F3

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	IGMS	Stock Option (right to buy)	Options Exercise	$0	-2,500	-16%	$0.000000	12,764	01 Jun 2021	Common Stock	2,500	$0.9300	Direct	F1, F4

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

Explanation of Responses:

Id	Content
F1	The option exercise and sale were effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person.
F2	Represents shares withheld by the Issuer to pay the exercise price and taxes pursuant to the "net exercise" of 2,500 option shares.
F3	The shares are held directly by the reporting person's spouse.
F4	The shares subject to the option are vested and exercisable as of the date hereof.