IGMS · Insider Trading
IGM Biosciences, Inc. Common Stock
Every open-market purchase and sale reported by IGMS officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2025-08-15 | Jeremy Green | 10%+ Owner | D | −5,929,686 | — |
| 2025-08-14 | Elizabeth H.Z. Thompson | Director | D | −7,196 | — |
| 2025-08-14 | Julie Hambleton | Director | D | −2,000 | — |
| 2025-08-14 | William Strohl | Director | D | −125,000 | — |
| 2025-08-14 | Mary Beth Harler | Chief Executive Officer | D | −323,680 | — |
| 2025-08-14 | Michael Stewart Lee | Director | D | −12,712 | — |
| 2025-08-14 | Topsoe Holding A/S | 10%+ Owner | D | −10,400,564 | — |
| 2025-08-14 | Jakob Haldor Topsoe | Director | D | −10,492,276 | — |
| 2025-08-14 | M Kathleen Behrens | Director | D | −412,535 | — |
| 2025-08-14 | Christina Teng Topsoe | Director | D | −10,464,599 | — |
| 2025-07-25 | Misbah Tahir | CHIEF FINANCIAL OFFICER | Sell | −8,741 | −$11.13K |
| 2025-07-25 | Lisa Lynn Decker | CHIEF BUSINESS OFFICER | Sell | −4,409 | −$5.61K |
| 2025-07-25 | Mary Beth Harler | Chief Executive Officer | Sell | −14,501 | −$18.46K |
| 2025-07-02 | Michael Stewart Lee | Director | A | +828 | — |
| 2025-07-02 | Elizabeth H.Z. Thompson | Director | A | +694 | — |
| 2025-07-02 | Redmile Group, LLC | Director | A | +1,656 | — |
| 2025-07-02 | Julian Baker | Director | A | +11,436 | — |
| 2025-07-02 | Christina Teng Topsoe | Director | A | +1,284 | — |
| 2025-07-02 | Jakob Haldor Topsoe | Director | A | +828 | — |
| 2025-07-02 | M Kathleen Behrens | Director | A | +1,471 | — |
| 2025-06-20 | Steven Weber | PRINCIPAL ACCOUNTING OFFICER | Sell | −486 | −$583 |
| 2025-06-20 | Lisa Lynn Decker | CHIEF BUSINESS OFFICER | Sell | −951 | −$1.14K |
| 2025-06-20 | Mary Beth Harler | Chief Executive Officer | Sell | −1,522 | −$1.83K |
| 2025-06-20 | Misbah Tahir | CHIEF FINANCIAL OFFICER | Sell | −1,522 | −$1.83K |
| 2025-05-16 | Steven Weber | PRINCIPAL ACCOUNTING OFFICER | Sell | −1,865 | −$2.09K |
| 2025-04-02 | Jeremy Green | Director | A | +1,656 | — |
| 2025-04-02 | Christina Teng Topsoe | Director | A | +1,284 | — |
| 2025-04-02 | Jakob Haldor Topsoe | Director | A | +828 | — |
| 2025-04-02 | Julian Baker | Director | A | +11,436 | — |
| 2025-04-02 | M Kathleen Behrens | Director | A | +1,471 | — |
| 2025-04-02 | Michael Stewart Lee | Director | A | +828 | — |
| 2025-04-02 | Elizabeth H.Z. Thompson | Director | A | +694 | — |
| 2025-03-18 | Mary Beth Harler | Chief Executive Officer | Sell | −7,329 | −$9.01K |
| 2025-03-18 | Steven Weber | PRINCIPAL ACCOUNTING OFFICER | Sell | −1,701 | −$2.09K |
| 2025-03-18 | Misbah Tahir | CHIEF FINANCIAL OFFICER | Sell | −7,329 | −$9.01K |
| 2025-03-18 | Lisa Lynn Decker | CHIEF BUSINESS OFFICER | Sell | −4,512 | −$5.55K |
| 2025-01-17 | Steven Weber | PRINCIPAL ACCOUNTING OFFICER | Sell | −1,122 | −$1.91K |
| 2025-01-03 | M Kathleen Behrens | Director | A | +3,078 | — |
| 2025-01-03 | Jakob Haldor Topsoe | Director | A | +1,734 | — |
| 2025-01-03 | Christina Teng Topsoe | Director | A | +2,687 | — |
| 2025-01-03 | Elizabeth H.Z. Thompson | Director | A | +1,452 | — |
| 2025-01-03 | 667, L.P. | Director | A | +23,928 | — |
| 2025-01-02 | Michael Stewart Lee | Director | A | +1,734 | — |
| 2025-01-02 | Jeremy Green | 10%+ Owner | A | +3,468 | — |
| 2024-12-18 | Lisa Lynn Decker | CHIEF BUSINESS OFFICER | Sell | −1,063 | −$7.95K |
| 2024-12-18 | Steven Weber | PRINCIPAL ACCOUNTING OFFICER | Sell | −539 | −$4.03K |
| 2024-12-18 | Misbah Tahir | CHIEF FINANCIAL OFFICER | Sell | −1,708 | −$12.78K |
| 2024-12-18 | Mary Beth Harler | Chief Executive Officer | Sell | −1,708 | −$12.78K |
| 2024-11-20 | Misbah Tahir | CHIEF FINANCIAL OFFICER | A | +66,667 | — |
| 2024-11-12 | Steven Weber | PRINCIPAL ACCOUNTING OFFICER | A | +6,700 | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Redmile Group, LLC | Director | 2,964,843 | $3.77M |
| Julian Baker | Director | 357,048 | $453.45K |
| 667, L.P. | Director | 355,142 | $451.03K |
| Misbah Tahir | CHIEF FINANCIAL OFFICER | 170,061 | $215.98K |
| Lisa Lynn Decker | CHIEF BUSINESS OFFICER | 68,169 | $86.57K |
| Steven Weber | PRINCIPAL ACCOUNTING OFFICER | 26,530 | $33.69K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the IGMS quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.