Who owns IMRX (IMRX)
Which tracked institutional funds hold IMRX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See IMRX company fundamentals →
Ownership as of the 2026-Q1 13F filings. 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
11 tracked funds added or opened IMRX while 26 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
IMRX’s largest tracked holder by dollar value, FMR LLC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in IMRX divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 95 tracked filers holding IMRX, 57 increased or opened the position and 43 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in IMRX between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 5
- VANGUARD CAPITAL MANAGEMENT LLC$12M
- Summit Financial, LLC$2M
- VANGUARD FIDUCIARY TRUST CO$2M
- WELLINGTON MANAGEMENT GROUP LLP$824K
- Prosight Management, LP$650K
Full exits 7
- Empery Asset Management, LP$18M
- VANGUARD GROUP INC$17M
- Blue Owl Capital Holdings LP$4M
- SOUTHPORT MANAGEMENT, L.L.C.$2M
- Qube Research & Technologies Ltd$1M
- Woodline Partners LP$987K
Largest adds
- MARSHALL WACE, LLP$6M
- MILLENNIUM MANAGEMENT LLC$5M
- CITADEL ADVISORS LLC$2M
- Connor, Clark & Lunn Investment Management Ltd.$1M
- UBS Group AG$731K
- Squarepoint Ops LLC$584K
Largest trims
- STATE STREET CORP$14M
- FMR LLC$13M
- Sanofi$4M
- PRICE T ROWE ASSOCIATES INC /MD/$3M
- MORGAN STANLEY$2M
- BlackRock, Inc.$2M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| FMR LLC trimmed | 9,605,228 | $51M | 22.8% | 2026-Q1 |
| Sanofi | 2,708,559 | $14M | 6.4% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 2,288,341 | $12M | 5.4% | 2026-Q1 |
| MARSHALL WACE, LLP added | 1,996,585 | $11M | 4.7% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 1,829,188 | $10M | 4.3% | 2026-Q1 |
| BlackRock, Inc. added | 1,507,258 | $8M | 3.6% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 1,102,712 | $6M | 2.6% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 637,944 | $3M | 1.5% | 2026-Q1 |
| Occam Crest Management LP added | 545,098 | $3M | 1.3% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 447,278 | $2M | 1.1% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. added | 400,363 | $2M | 0.9% | 2026-Q1 |
| Summit Financial, LLC new | 376,749 | $2M | 0.9% | 2026-Q1 |
| UBS Group AG added | 376,284 | $2M | 0.9% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 327,655 | $2M | 0.8% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 322,038 | $2M | 0.8% | 2026-Q1 |
| Burkehill Global Management, LP | 300,000 | $2M | 0.7% | 2026-Q1 |
| MORGAN STANLEY trimmed | 296,067 | $2M | 0.7% | 2026-Q1 |
| STATE STREET CORP trimmed | 268,520 | $1M | 0.6% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 244,771 | $1M | 0.6% | 2026-Q1 |
| Squarepoint Ops LLC added | 226,046 | $1M | 0.5% | 2026-Q1 |
| Diametric Capital, LP trimmed | 174,897 | $922K | 0.4% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP new | 156,424 | $824K | 0.4% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 150,847 | $795K | 0.4% | 2026-Q1 |
| 683 Capital Management, LLC | 150,697 | $794K | 0.4% | 2026-Q1 |
| DCF Advisers, LLC trimmed | 141,462 | $746K | 0.3% | 2026-Q1 |
| HighTower Advisors, LLC added | 131,286 | $692K | 0.3% | 2026-Q1 |
| Prosight Management, LP trimmed | 123,409 | $650K | 0.3% | 2026-Q1 |
| Kingsview Wealth Management, LLC added | 122,200 | $644K | 0.3% | 2026-Q1 |
| BARCLAYS PLC trimmed | 121,978 | $643K | 0.3% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 118,149 | $623K | 0.3% | 2026-Q1 |
| NORTHERN TRUST CORP added | 117,666 | $620K | 0.3% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 105,507 | $556K | 0.3% | 2026-Q1 |
| Hudson Bay Capital Management LP added | 95,889 | $505K | 0.2% | 2026-Q1 |
| TD Asset Management Inc trimmed | 94,340 | $497K | 0.2% | 2026-Q1 |
| Weiss Asset Management LP new | 87,985 | $464K | 0.2% | 2026-Q1 |
| Brevan Howard Capital Management LP new | 86,236 | $454K | 0.2% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 77,414 | $408K | 0.2% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP added | 76,752 | $404K | 0.2% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 72,875 | $384K | 0.2% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | 69,738 | $368K | 0.2% | 2026-Q1 |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C. trimmed | 67,495 | $356K | 0.2% | 2026-Q1 |
| Clearstead Advisors, LLC new | 60,865 | $321K | 0.1% | 2026-Q1 |
| Flower City Capital added | 55,029 | $290K | 0.1% | 2026-Q1 |
| HRT FINANCIAL LP added | 42,456 | $223K | 0.1% | 2026-Q1 |
| CITIGROUP INC added | 40,417 | $213K | 0.1% | 2026-Q1 |
| HSBC HOLDINGS PLC new | 37,771 | $198K | 0.1% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 37,344 | $197K | 0.1% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 34,224 | $180K | 0.1% | 2026-Q1 |
| OPPENHEIMER & CO INC new | 34,000 | $179K | 0.1% | 2026-Q1 |
| PRELUDE CAPITAL MANAGEMENT, LLC trimmed | 29,219 | $154K | 0.1% | 2026-Q1 |
| Berman McAleer LLC | 25,000 | $132K | 0.1% | 2026-Q1 |
| LPL Financial LLC trimmed | 24,345 | $128K | 0.1% | 2026-Q1 |
| FIRST MANHATTAN CO. LLC. | 24,245 | $128K | 0.1% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 24,243 | $128K | 0.1% | 2026-Q1 |
| CIBC Bancorp USA Inc. new | 23,500 | $124K | 0.1% | 2026-Q1 |
| ALETHEA CAPITAL MANAGEMENT, LLC | 22,935 | $121K | 0.1% | 2026-Q1 |
| OMERS ADMINISTRATION Corp trimmed | 22,400 | $118K | 0.1% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC new | 21,863 | $115K | 0.1% | 2026-Q1 |
| GREAT VALLEY ADVISOR GROUP, INC. added | 21,120 | $112K | 0.1% | 2026-Q1 |
| PNC FINANCIAL SERVICES GROUP, INC. | 20,000 | $105K | 0.0% | 2026-Q1 |
| FNY Investment Advisers, LLC new | 20,000 | $105K | 0.0% | 2026-Q1 |
| Future Financial Wealth Managment LLC | 18,000 | $104K | 0.0% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP | 19,562 | $103K | 0.0% | 2026-Q1 |
| Palumbo Wealth Management LLC trimmed | 18,670 | $98K | 0.0% | 2026-Q1 |
| NATIONS FINANCIAL GROUP INC, /IA/ /ADV added | 17,000 | $90K | 0.0% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 16,800 | $89K | 0.0% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC new | 15,900 | $84K | 0.0% | 2026-Q1 |
| Kelsey Financial, LLC added | 15,099 | $80K | 0.0% | 2026-Q1 |
| WENDELL DAVID ASSOCIATES INC | 15,000 | $79K | 0.0% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd trimmed | 14,280 | $75K | 0.0% | 2026-Q1 |
| Catalyst Funds Management Pty Ltd added | 12,800 | $67K | 0.0% | 2026-Q1 |
| Cetera Investment Advisers new | 12,649 | $67K | 0.0% | 2026-Q1 |
| Empery Asset Management, LP new | 2,674,950 | $18M | 7.9% | 2025-Q4 stale |
| VANGUARD GROUP INC added | 2,568,293 | $17M | 7.6% | 2025-Q4 stale |
| ExodusPoint Capital Management, LP added | 1,516,833 | $11M | 4.8% | 2025-Q3 stale |
| Logos Global Management LP new | 950,000 | $7M | 3.0% | 2025-Q3 stale |
| Blue Owl Capital Holdings LP added | 665,000 | $4M | 2.0% | 2025-Q4 stale |
| Monashee Investment Management LLC new | 300,000 | $2M | 0.9% | 2025-Q3 stale |
| IRIDIAN ASSET MANAGEMENT LLC/CT new | 275,086 | $2M | 0.9% | 2025-Q3 stale |
| SOUTHPORT MANAGEMENT, L.L.C. added | 277,501 | $2M | 0.8% | 2025-Q4 stale |
| Qube Research & Technologies Ltd added | 165,875 | $1M | 0.5% | 2025-Q4 stale |
| AWM Investment Company, Inc. new | 150,000 | $1M | 0.5% | 2025-Q3 stale |
| Woodline Partners LP | 150,000 | $987K | 0.4% | 2025-Q4 stale |
| Rafferty Asset Management, LLC new | 130,742 | $860K | 0.4% | 2025-Q4 stale |
| Avidity Partners Management LP new | 90,900 | $636K | 0.3% | 2025-Q3 stale |
| XTX Topco Ltd added | 64,040 | $448K | 0.2% | 2025-Q3 stale |
| FOX RUN MANAGEMENT, L.L.C. new | 51,773 | $341K | 0.2% | 2025-Q4 stale |
| AMERIPRISE FINANCIAL INC new | 47,299 | $331K | 0.1% | 2025-Q3 stale |
| PROFUND ADVISORS LLC new | 47,135 | $310K | 0.1% | 2025-Q4 stale |
| Corient Private Wealth LLC trimmed | 35,870 | $236K | 0.1% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP trimmed | 31,800 | $209K | 0.1% | 2025-Q4 stale |
| EntryPoint Capital, LLC new | 31,237 | $206K | 0.1% | 2025-Q4 stale |
| CIBC Private Wealth Group LLC trimmed | 28,500 | $188K | 0.1% | 2025-Q4 stale |
| Quadrature Capital Ltd new | 23,785 | $166K | 0.1% | 2025-Q3 stale |
| HEIGHTS CAPITAL MANAGEMENT, INC new | 20,000 | $140K | 0.1% | 2025-Q3 stale |
| Resonant Capital Advisors, LLC | 20,000 | $132K | 0.1% | 2025-Q4 stale |
| Lighthouse Investment Partners, LLC new | 17,760 | $117K | 0.1% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC added | 29,404 | $99K | 0.0% | 2025-Q2 stale |
| Virtu Financial LLC added | 13,994 | $98K | 0.0% | 2025-Q3 stale |
| SummitTX Capital, L.P. new | 10,469 | $69K | 0.0% | 2025-Q4 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.