IGM Biosciences, Inc.
IGM Biosciences, Inc. (IGMS) Insider Trading
Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.
SEC EDGAR · FMP · IGMS · as of Jun 9, 2026
Activity summary
Buy transactions
0
P-Purchase only
Sell transactions
17
12 Months
Buy/Sell ratio
0.00
Buy/Sell (by trades)
Overall sentiment
IGM Biosciences, Inc. insiders have been primarily selling shares over the past 12 Months. Selling activity is often driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment toward the company.
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only
As of Jun 9, 2026
IGMS insider buying and selling by quarter
IGMS insider selling · IGMS insider buying stocks · quarterly insider activity
Mobile shows last 4Q · Desktop shows full 8Q
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters
As of Jun 9, 2026
Active insiders
Most active in past 12 months · IGMS ceo insider trading
Showing all insiders · Click a card to filter the transactions table below
▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API
Recent insider transactions
IGMS executive sell shares · IGMS board member insider trading · IGMS insider trading SEC filing
Scroll horizontally to see all columns
| Date | Insider | Type | Shares | Value | Filing |
|---|---|---|---|---|---|
| Aug 14, 2025 | BAKER BROS. ADVISORS LP Director · 10% Owner | Other | 3,763,362 | $4.69M⚡ | Form 4 |
| Aug 14, 2025 | Redmile Group, LLC Director | Other | 2,964,843 | $3.70M⚡ | Form 4 |
| Aug 14, 2025 | Hambleton Julie Director | Other | 2,000 | — | Form 4 |
| Aug 14, 2025 | Lee Michael Stewart Director | Other | 12,712 | $16K | Form 4 |
| Aug 14, 2025 | Topsoe Holding A/S 10 percent owner | Other | 10,400,564 | — | Form 4 |
| Aug 14, 2025 | Topsoe Jakob Haldor Director | Other | 10,400,564 | — | Form 4 |
| Aug 14, 2025 | Topsoe Christina Teng Director | Other | 9,800 | — | Form 4 |
| Aug 14, 2025 | Thompson Elizabeth H.Z. Director | Other | 7,196 | — | Form 4 |
| Aug 14, 2025 | Strohl William Director | Other | 125,000 | — | Form 4 |
| Aug 14, 2025 | Harler Mary Beth CEO · Director | Other | 323,680 | — | Form 4 |
| Aug 14, 2025 | BEHRENS M KATHLEEN Director | Other | 29,806 | — | Form 4 |
| Jul 23, 2025 | Tahir Misbah CHIEF FINANCIAL OFFICER | Sale | 8,741 | $11K | Form 4 |
| Jul 23, 2025 | Harler Mary Beth CEO · Director | Sale | 14,501 | $18K | Form 4 |
| Jul 23, 2025 | Decker Lisa Lynn CHIEF BUSINESS OFFICER | Sale | 4,409 | $6K | Form 4 |
| Jun 30, 2025 | Topsoe Jakob Haldor Director | Award | 828 | — | Form 4 |
| Jun 30, 2025 | Topsoe Christina Teng Director | Award | 1,284 | — | Form 4 |
| Jun 30, 2025 | Thompson Elizabeth H.Z. Director | Award | 694 | — | Form 4 |
| Jun 30, 2025 | BEHRENS M KATHLEEN Director | Award | 1,471 | — | Form 4 |
| Jun 30, 2025 | BAKER BROS. ADVISORS LP Director | Award | 953 | — | Form 4 |
| Jun 30, 2025 | BAKER BROS. ADVISORS LP Director | Award | 953 | — | Form 4 |
| Jun 30, 2025 | Lee Michael Stewart Director | Award | 828 | — | Form 4 |
| Jun 30, 2025 | Redmile Group, LLC Director | Award | 828 | — | Form 4 |
| Jun 16, 2025 | Weber Steven PRINCIPAL ACCOUNTING OFFICER | Sale | 486 | $583 | Form 4 |
| Jun 16, 2025 | Tahir Misbah CHIEF FINANCIAL OFFICER | Sale | 1,522 | $2K | Form 4 |
| Jun 16, 2025 | Harler Mary Beth CEO · Director | Sale | 1,522 | $2K | Form 4 |
BAKER BROS. ADVISORS LP
Director · 10% Owner
Date
Aug 14
Shares
3,763,362
Price
$1.25
Value
$4.69M ⚡
Redmile Group, LLC
Director
Date
Aug 14
Shares
2,964,843
Price
$1.25
Value
$3.70M ⚡
Tahir Misbah
CHIEF FINANCIAL OFFICER
Date
Jul 23
Shares
8,741
Price
$1.27
Value
$11K
Decker Lisa Lynn
CHIEF BUSINESS OFFICER
Date
Jul 23
Shares
4,409
Price
$1.27
Value
$6K
Weber Steven
PRINCIPAL ACCOUNTING OFFICER
Date
Jun 16
Shares
486
Price
$1.20
Value
$583
Tahir Misbah
CHIEF FINANCIAL OFFICER
Date
Jun 16
Shares
1,522
Price
$1.20
Value
$2K
⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar
▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —
About IGMS insider trading
IGMS insider trades
IGM Biosciences, Inc. (IGMS) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including BAKER BROS. ADVISORS LP (Director · 10% Owner), Harler Mary Beth (CEO · Director), Redmile Group, LLC (Director). Over the past 12 months, 5 insiders have filed transactions with the SEC. IGMS insiders have been primarily selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.
For IGM Biosciences, Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →
Frequently asked questions
IGMS insider trading · 5 questionsThe insiders of IGM Biosciences, Inc. (IGMS) include executives and directors such as BAKER BROS. ADVISORS LP (Director · 10% Owner), Harler Mary Beth (CEO · Director), Redmile Group, LLC (Director), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.
▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 9, 2026