IGMS

IGM Biosciences, Inc.

Insider trading activity for IGM Biosciences, Inc., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

net buying

Bought(0 · 0 insiders): $0
Sold(0 · 0 insiders): $0

Past 6 months

net buying

Bought(0 · 0 insiders): $0
Sold(0 · 0 insiders): $0

Past 12 months

net buying

Bought(0 · 0 insiders): $0
Sold(0 · 0 insiders): $0

Transaction history

The 41 most recent Form 4 transactions.

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Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Aug 14, 2025	Topsoe Holding A/S	10% Owner	DTOISS◆	5M	—	—	—	Open the original filing on SEC.gov
Aug 14, 2025	Topsoe Holding A/S	10% Owner	DTOISS	10.4M	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Topsoe Jakob Haldor	Director, 10% Owner	DTOISS◆	5M	—	—	—	Open the original filing on SEC.gov
Aug 14, 2025	Topsoe Jakob Haldor	Director, 10% Owner	DTOISS	10.4M	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Topsoe Jakob Haldor	Director, 10% Owner	DTOISS	91,712	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Topsoe Christina Teng	Director, 10% Owner	DTOISS◆	5M	—	—	—	Open the original filing on SEC.gov
Aug 14, 2025	Topsoe Christina Teng	Director, 10% Owner	DTOISS	9,800	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Topsoe Christina Teng	Director, 10% Owner	DTOISS	10.4M	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Topsoe Christina Teng	Director, 10% Owner	DTOISS	54,235	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Thompson Elizabeth H.Z.	Director	DTOISS	7,196	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Strohl William	Director	DTOISS	125,000	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Lee Michael Stewart	Director	DTOISS	12,712	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Harler Mary Beth	Chief Executive Officer	DTOISS	323,680	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Hambleton Julie	Director	DTOISS	2,000	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Behrens M Kathleen	Director	DTOISS	29,806	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Behrens M Kathleen	Director	DTOISS	29,807	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Behrens M Kathleen	Director	DTOISS	330,700	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Behrens M Kathleen	Director	DTOISS	22,222	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Redmile Group, LLC	Director, 10% Owner	DTOISS◆	667,666	—	—	—	Open the original filing on SEC.gov
Aug 14, 2025	Redmile Group, LLC	Director, 10% Owner	DTOISS◆	7.2M	—	—	—	Open the original filing on SEC.gov
Aug 14, 2025	Redmile Group, LLC	Director, 10% Owner	DTOISS	3M	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Baker Bros. Advisors Lp	Former 10% owner and…	UTENDR◆	9.9M	—	—	—	Open the original filing on SEC.gov
Aug 14, 2025	Baker Bros. Advisors Lp	Former 10% owner and…	UTENDR◆	834,707	—	—	—	Open the original filing on SEC.gov
Aug 14, 2025	Baker Bros. Advisors Lp	Former 10% owner and…	UTENDR	3.8M	—	—	-100.0%	Open the original filing on SEC.gov
Aug 14, 2025	Baker Bros. Advisors Lp	Former 10% owner and…	UTENDR	357,048	—	—	-100.0%	Open the original filing on SEC.gov
Jul 23, 2025	Tahir Misbah	Chief Financial Officer	SSELL	8,741	$1.27	$11.1K	-4.9%	Open the original filing on SEC.gov
Jul 23, 2025	Harler Mary Beth	Chief Executive Officer	SSELL	14,501	$1.27	$18.5K	-4.3%	Open the original filing on SEC.gov
Jul 23, 2025	Decker Lisa Lynn	Chief Business Officer	SSELL	4,409	$1.27	$5.6K	-6.1%	Open the original filing on SEC.gov
Jun 30, 2025	Topsoe Jakob Haldor	Director, 10% Owner	AGRANT	828	—	—	+0.9%	Open the original filing on SEC.gov
Jun 30, 2025	Topsoe Christina Teng	Director, 10% Owner	AGRANT	1,284	—	—	+2.4%	Open the original filing on SEC.gov
Jun 30, 2025	Thompson Elizabeth H.Z.	Director	AGRANT	694	—	—	+10.7%	Open the original filing on SEC.gov
Jun 30, 2025	Lee Michael Stewart	Director	AGRANT	828	—	—	+7.0%	Open the original filing on SEC.gov
Jun 30, 2025	Redmile Group, LLC	Director, 10% Owner	AGRANT	828	—	—	+<0.1%	Open the original filing on SEC.gov
Jun 30, 2025	Behrens M Kathleen	Director	AGRANT	1,471	—	—	+7.1%	Open the original filing on SEC.gov
Jun 30, 2025	Baker Bros. Advisors Lp	Director, 10% Owner	AGRANT	953	—	—	+<0.1%	Open the original filing on SEC.gov
Jun 30, 2025	Baker Bros. Advisors Lp	Director, 10% Owner	AGRANT	953	—	—	+0.3%	Open the original filing on SEC.gov
Jun 16, 2025	Weber Steven	Principal Accounting…	SSELL	486	$1.20	$583	-1.8%	Open the original filing on SEC.gov
Jun 16, 2025	Tahir Misbah	Chief Financial Officer	SSELL	1,522	$1.20	$1.8K	-0.8%	Open the original filing on SEC.gov
Jun 16, 2025	Harler Mary Beth	Chief Executive Officer	SSELL	1,522	$1.20	$1.8K	-0.4%	Open the original filing on SEC.gov
Jun 16, 2025	Decker Lisa Lynn	Chief Business Officer	SSELL	951	$1.20	$1.1K	-1.3%	Open the original filing on SEC.gov
May 14, 2025	Weber Steven	Principal Accounting…	SSELL	1,865	$1.12	$2.1K	-6.5%	Open the original filing on SEC.gov

DTOISS◆—

Topsoe Holding A/S · 10% OwnerAug 14, 2025

5M sh

DTOISS—

Topsoe Holding A/S · 10% OwnerAug 14, 2025

10.4M sh · -100.0% own

DTOISS◆—

Topsoe Jakob Haldor · Director, 10%…Aug 14, 2025

5M sh

DTOISS—

Topsoe Jakob Haldor · Director, 10%…Aug 14, 2025

10.4M sh · -100.0% own

DTOISS—

Topsoe Jakob Haldor · Director, 10%…Aug 14, 2025

91,712 sh · -100.0% own

DTOISS◆—

Topsoe Christina Teng · Director, 10%…Aug 14, 2025

5M sh

DTOISS—

Topsoe Christina Teng · Director, 10%…Aug 14, 2025

9,800 sh · -100.0% own

DTOISS—

Topsoe Christina Teng · Director, 10%…Aug 14, 2025

10.4M sh · -100.0% own

DTOISS—

Topsoe Christina Teng · Director, 10%…Aug 14, 2025

54,235 sh · -100.0% own

DTOISS—

Thompson Elizabeth H.Z. · DirectorAug 14, 2025

7,196 sh · -100.0% own

DTOISS—

Strohl William · DirectorAug 14, 2025

125,000 sh · -100.0% own

DTOISS—

Lee Michael Stewart · DirectorAug 14, 2025

12,712 sh · -100.0% own

DTOISS—

Harler Mary Beth · Chief Executive…Aug 14, 2025

323,680 sh · -100.0% own

DTOISS—

Hambleton Julie · DirectorAug 14, 2025

2,000 sh · -100.0% own

DTOISS—

Behrens M Kathleen · DirectorAug 14, 2025

29,806 sh · -100.0% own

DTOISS—

Behrens M Kathleen · DirectorAug 14, 2025

29,807 sh · -100.0% own

DTOISS—

Behrens M Kathleen · DirectorAug 14, 2025

330,700 sh · -100.0% own

DTOISS—

Behrens M Kathleen · DirectorAug 14, 2025

22,222 sh · -100.0% own

DTOISS◆—

Redmile Group, LLC · Director, 10%…Aug 14, 2025

667,666 sh

DTOISS◆—

Redmile Group, LLC · Director, 10%…Aug 14, 2025

7.2M sh

DTOISS—

Redmile Group, LLC · Director, 10%…Aug 14, 2025

3M sh · -100.0% own

UTENDR◆—

Baker Bros. Advisors Lp · Former 10% owner…Aug 14, 2025

9.9M sh

UTENDR◆—

Baker Bros. Advisors Lp · Former 10% owner…Aug 14, 2025

834,707 sh

UTENDR—

Baker Bros. Advisors Lp · Former 10% owner…Aug 14, 2025

3.8M sh · -100.0% own

UTENDR—

Baker Bros. Advisors Lp · Former 10% owner…Aug 14, 2025

357,048 sh · -100.0% own

SSELL$11.1K

Tahir Misbah · Chief Financial…Jul 23, 2025

8,741 sh @ $1.27 · -4.9% own

SSELL$18.5K

Harler Mary Beth · Chief Executive…Jul 23, 2025

14,501 sh @ $1.27 · -4.3% own

SSELL$5.6K

Decker Lisa Lynn · Chief Business…Jul 23, 2025

4,409 sh @ $1.27 · -6.1% own

AGRANT—

Topsoe Jakob Haldor · Director, 10%…Jun 30, 2025

828 sh · +0.9% own

AGRANT—

Topsoe Christina Teng · Director, 10%…Jun 30, 2025

1,284 sh · +2.4% own

AGRANT—

Thompson Elizabeth H.Z. · DirectorJun 30, 2025

694 sh · +10.7% own

AGRANT—

Lee Michael Stewart · DirectorJun 30, 2025

828 sh · +7.0% own

AGRANT—

Redmile Group, LLC · Director, 10%…Jun 30, 2025

828 sh · +<0.1% own

AGRANT—

Behrens M Kathleen · DirectorJun 30, 2025

1,471 sh · +7.1% own

AGRANT—

Baker Bros. Advisors Lp · Director, 10%…Jun 30, 2025

953 sh · +<0.1% own

AGRANT—

Baker Bros. Advisors Lp · Director, 10%…Jun 30, 2025

953 sh · +0.3% own

SSELL$583

Weber Steven · Principal Accounti…Jun 16, 2025

486 sh @ $1.20 · -1.8% own

SSELL$1.8K

Tahir Misbah · Chief Financial…Jun 16, 2025

1,522 sh @ $1.20 · -0.8% own

SSELL$1.8K

Harler Mary Beth · Chief Executive…Jun 16, 2025

1,522 sh @ $1.20 · -0.4% own

SSELL$1.1K

Decker Lisa Lynn · Chief Business…Jun 16, 2025

951 sh @ $1.20 · -1.3% own

SSELL$2.1K

Weber Steven · Principal Accounti…May 14, 2025

1,865 sh @ $1.12 · -6.5% own

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

All 17 filings we hold were filed within the two-business-day deadline.

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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