Comparable stake leader
PRICE T ROWE ASSOCIATES INC /MD/
SEC ownership of IGM Biosciences, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001496323.
Disclosed value leader
Fred Schwarzer
Comparable rows
4/11
Latest evidence
14 Aug 2025
- Parsed ownership sources
-
13D/G and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
PRICE T ROWE ASSOCIATES INC /MD/
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
4 of 11
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
PRICE T ROWE ASSOCIATES INC /MD/
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
14 Aug 2025
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001496323
- Issuer location
- Mountain View, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of IGM Biosciences, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
PRICE T ROWE ASSOCIATES I...
Disclosed value leader
Fred Schwarzer
Comparable rows
4/11
Latest evidence
14 Aug 2025
13D/G
3/4/5
Lead comparable stake: 0.2%
7 rows are not safely comparable across share classes.
13D/G row: PRICE T ROWE ASSOCIATES INC /MD/
Showing 1-8 of 11 holder rows.
Quick read
PRICE T ROWE ASSOCIATES INC /MD/ leads the comparable SEC ownership view at 0.2%.
4 of 11 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens PRICE T ROWE ASSOCIATES INC /MD/'s linked filing trail.
Comparable ownership
Top 4
PRICE T ROWE ASSOCIATES INC /MD/
0.2%
Misbah Tahir
0.49%
Lisa Lynn Decker
0.2%
Steven Weber
0.08%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 11 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| PRICE T ROWE ASSOCIATES INC /MD/ |
13D/G
T. Rowe Price Associates, Inc.
|
0.2%
|
$86,381
65,940 shares
|
-$4,589,007 | 31 Jan 2025 |
| Misbah Tahir |
3/4/5
CHIEF FINANCIAL OFFICER
|
0.49%
|
$216,453
170,061 shares
|
— | 23 Jul 2025 |
| Lisa Lynn Decker |
3/4/5
CHIEF BUSINESS OFFICER
|
0.2%
|
$86,765
68,169 shares
|
— | 23 Jul 2025 |
| Steven Weber |
3/4/5
PRINCIPAL ACCOUNTING OFFICER
|
0.08%
|
$31,814
26,530 shares
|
— | 16 Jun 2025 |
| Fred Schwarzer |
3/4/5
CEO AND PRESIDENT, Director
|
—
mixed-class rows
|
$5,156,021
692,342 shares
mixed-class rows
|
— | 13 Sep 2024 |
| Bruce Keyt |
3/4/5
CHIEF SCIENTIFIC OFFICER
|
—
class O/S missing
|
$2,849,933
246,987 shares
|
— | 13 Sep 2024 |
| Chris H. Takimoto |
3/4/5
CHIEF MEDICAL OFFICER
|
—
class O/S missing
|
$1,780,795
154,331 shares
|
— | 13 Sep 2024 |
| Daniel ShinYu Chen |
3/4/5
Chief Medical Officer
|
—
mixed-class rows
|
$769,019
454,858 shares
mixed-class rows
|
— | 01 Jul 2021 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 03 Aug 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 20 reporting-owner rows connected to IGM Biosciences, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
20
Largest Forms 3/4/5 holder
Fred Schwarzer
Net 12M change
$0
Latest report
14 Aug 2025
Recent insider transactions for IGM Biosciences, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Baker Bros. Advisors Lp | IGMS | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -4,120,410 | 0 | 14 Aug 2025 | See Footnotes | ||
| Baker Bros. Advisors Lp | IGMS | Non-Voting Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -10,720,924 | 0 | 14 Aug 2025 | See Footnotes | ||
| Redmile Group, LLC | IGMS | Common Stock | Disposed to Issuer | -100% | -2,964,843 | 0 | 14 Aug 2025 | See Footnotes | ||
| Redmile Group, LLC | IGMS | Pre-Funded Warrants to Purchase Common Stock | Disposed to Issuer | -100% | -667,666 | 0 | 14 Aug 2025 | See Footnotes | ||
| Redmile Group, LLC | IGMS | Non-Voting Common Stock | Disposed to Issuer | -100% | -7,199,325 | 0 | 14 Aug 2025 | See Footnotes | ||
| Julie Hambleton | IGMS | Common Stock | Disposed to Issuer | -100% | -2,000 | 0 | 14 Aug 2025 | Direct | ||
| Michael Stewart Lee | IGMS | Common Stock | Disposed to Issuer | -100% | -12,712 | 0 | 14 Aug 2025 | Direct | ||
| Topsoe Holding A/S | IGMS | Common Stock | Disposed to Issuer | -100% | -10,400,564 | 0 | 14 Aug 2025 | Direct | ||
| Topsoe Holding A/S | IGMS | Non-Voting Common Stock | Disposed to Issuer | -100% | -5,044,295 | 0 | 14 Aug 2025 | Direct | ||
| Jakob Haldor Topsoe | IGMS | Common Stock | Disposed to Issuer | -100% | -10,400,564 | 0 | 14 Aug 2025 | See footnote | ||
| Jakob Haldor Topsoe | IGMS | Common Stock | Disposed to Issuer | -100% | -91,712 | 0 | 14 Aug 2025 | Direct | ||
| Jakob Haldor Topsoe | IGMS | Non-Voting Common Stock | Disposed to Issuer | -100% | -5,044,295 | 0 | 14 Aug 2025 | See footnote | ||
| Christina Teng Topsoe | IGMS | Common Stock | Disposed to Issuer | -100% | -10,410,364 | 0 | 14 Aug 2025 | See footnote | ||
| Christina Teng Topsoe | IGMS | Common Stock | Disposed to Issuer | -100% | -54,235 | 0 | 14 Aug 2025 | Direct | ||
| Christina Teng Topsoe | IGMS | Non-Voting Common Stock | Disposed to Issuer | -100% | -5,044,295 | 0 | 14 Aug 2025 | See footnote | ||
| Elizabeth H.z. Thompson | IGMS | Common Stock | Disposed to Issuer | -100% | -7,196 | 0 | 14 Aug 2025 | Direct | ||
| William Strohl | IGMS | Common Stock | Disposed to Issuer | -100% | -125,000 | 0 | 14 Aug 2025 | Direct | ||
| Mary Beth Harler | IGMS | Common Stock | Disposed to Issuer | -100% | -323,680 | 0 | 14 Aug 2025 | Direct | ||
| M. Kathleen Behrens | IGMS | Common Stock | Disposed to Issuer | -100% | -390,313 | 0 | 14 Aug 2025 | See footnote | ||
| M. Kathleen Behrens | IGMS | Common Stock | Disposed to Issuer | -100% | -22,222 | 0 | 14 Aug 2025 | Direct |
* marks a reported price that did not pass the local price check.