IGM Biosciences, Inc. (IGMS) has 20 known insider and institutional holders on record. The largest holder is Haldor Topsoe Holding A/S with 10,400,564 shares. Other notable holders include Topsoe Holding A/S and Redmile Group, LLC.
Over the last 12 months, insiders have made 5 transactions in IGMS stock — 0 buys (valued at RSU Award) and 5 sells (valued at $7.46K). Insider selling has exceeded buying during this period.
IGMS Insider Ownership
Top Holder
Haldor Topsoe Holding A/S
10,400,564 shares
Buys (12 mo)
0
$0.00 value
Sells (12 mo)
5
$7.46K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Haldor Topsoe Holding A/s |
10 Percent Owner |
10,400,564 |
2020-12-15 |
|
| 2 |
Topsoe Holding A/s |
10 Percent Owner |
5,044,295 |
2023-06-28 |
|
| 3 |
Redmile Group, Llc |
10 Percent Owner |
2,964,015 |
2025-04-02 |
|
| 4 |
Green Jeremy |
Director |
667,666 |
2022-10-05 |
|
| 5 |
Baker Brothers Life Sciences Lp |
Director |
421,532 |
2022-04-05 |
|
| 6 |
Baker Bros. Advisors Lp |
10 Percent Owner |
356,095 |
2025-04-02 |
|
| 7 |
Harler Mary Beth |
Chief Executive Officer |
338,181 |
2025-06-20 |
|
| 8 |
Schwarzer Fred |
CEO and President |
250,124 |
2024-09-17 |
|
| 9 |
Keyt Bruce |
Chief Scientific Officer |
242,948 |
2024-09-17 |
|
| 10 |
Tahir Misbah |
Chief Financial Officer |
178,802 |
2025-06-20 |
|
| 11 |
Takimoto Chris H |
Chief Medical Officer |
154,331 |
2024-09-17 |
|
| 12 |
Strohl William |
Director |
125,000 |
2024-08-12 |
|
| 13 |
Chen Daniel Shinyu |
Chief Medical Officer |
117,461 |
2021-07-06 |
|
| 14 |
Topsoe Jakob Haldor |
10 Percent Owner |
90,884 |
2025-04-02 |
|
| 15 |
Decker Lisa Lynn |
Chief Business Officer |
72,578 |
2025-06-20 |
|
| 16 |
Topsoe Christina Teng |
10 Percent Owner |
52,951 |
2025-04-02 |
|
| 17 |
Gauthier George |
Chief Commercial Officer |
40,822 |
2023-12-01 |
|
| 18 |
Hambleton Julie |
Director |
29,400 |
2024-03-14 |
|
| 19 |
Weber Steven |
Principal Accounting Officer |
26,530 |
2025-06-20 |
|
| 20 |
Behrens M Kathleen |
Director |
20,751 |
2025-04-02 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2025-06-16 |
Harler Mary Beth |
Chief Executive Officer |
Informative Sell |
1,522 |
$1.20 |
$1.83K |
| 2025-06-16 |
Weber Steven |
Principal Accounting Officer |
Informative Sell |
486 |
$1.20 |
$582.81 |
| 2025-06-16 |
Tahir Misbah |
Chief Financial Officer |
Informative Sell |
1,522 |
$1.20 |
$1.83K |
| 2025-06-16 |
Decker Lisa Lynn |
Chief Business Officer |
Informative Sell |
951 |
$1.20 |
$1.14K |
| 2025-05-14 |
Weber Steven |
Principal Accounting Officer |
Informative Sell |
1,865 |
$1.12 |
$2.09K |
