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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1496323	Igm Biosciences Inc.	IGMS	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1211701	Kathleen M Behrens	C/O Igm Biosciences, Inc. 325 E. Middlefield Road Mountain View CA 94043		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2020-12-11	22,222	$90.00	22,222	No	4	P	Indirect	See footnote
Common Stock	Acquisiton	2020-12-11	11,111	$90.00	21,111	No	4	P	Indirect	See footnote
Common Stock	Acquisiton	2020-12-11	11,111	$90.00	21,111	No	4	P	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	See footnote
No	4	P	Indirect	See footnote
No	4	P	Indirect	See footnote

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	93,571	Direct

Footnotes

The shares were purchased pursuant to an underwritten public offering of the Issuer's securities.
The shares are held in the name of KBW 2005 Trust for which Reporting Person is the Trustee.
The shares are held in the name of Non-Exempt Trust for Patrick R. Wilsey Under the Alfred S. Wilsey, Jr. Revocable Trust for which Reporting Person is a Trustee.
The shares are held in the name of Non-Exempt Trust for Shannon K. Wilsey Under the Alfred S. Wilsey, Jr. Revocable Trust for which Reporting Person is a Trustee.