Who owns IMDX (IMDX)
Which tracked institutional funds hold IMDX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See IMDX 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
4 tracked funds added or opened IMDX while 8 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
IMDX’s largest tracked holder by dollar value, BROADWOOD CAPITAL INC, sizes it at 2.8% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 2.8pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in IMDX 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 41 tracked filers holding IMDX, 27 increased or opened the position and 18 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 IMDX 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 3
- Alyeska Investment Group, L.P.$3M
- VANGUARD CAPITAL MANAGEMENT LLC$2M
- HEIGHTS CAPITAL MANAGEMENT, INC$1M
Full exits 1
- VANGUARD GROUP INC$4M
Largest adds
- FNY Investment Advisers, LLC$507K
Largest trims
- BROADWOOD CAPITAL INC$46M
- AWM Investment Company, Inc.$12M
- PURA VIDA INVESTMENTS, LLC$4M
- GEODE CAPITAL MANAGEMENT, LLC$874K
- BlackRock, Inc.$541K
- 683 Capital Management, LLC$484K
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 |
|---|---|---|---|---|
| BROADWOOD CAPITAL INC added | 11,931,839 | $39M | 58.2% | 2026-Q1 |
| AWM Investment Company, Inc. trimmed | 2,806,256 | $9M | 13.7% | 2026-Q1 |
| PURA VIDA INVESTMENTS, LLC | 947,134 | $3M | 4.6% | 2026-Q1 |
| Alyeska Investment Group, L.P. new | 840,777 | $3M | 4.1% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 537,161 | $2M | 2.6% | 2026-Q1 |
| HEIGHTS CAPITAL MANAGEMENT, INC new | 392,545 | $1M | 1.9% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 262,053 | $860K | 1.3% | 2026-Q1 |
| FNY Investment Advisers, LLC added | 247,421 | $811K | 1.2% | 2026-Q1 |
| BlackRock, Inc. added | 135,345 | $444K | 0.7% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 132,591 | $435K | 0.6% | 2026-Q1 |
| Family Office Research LLC new | 127,266 | $417K | 0.6% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 103,470 | $339K | 0.5% | 2026-Q1 |
| Ghisallo Capital Management LLC new | 70,695 | $232K | 0.3% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 56,093 | $184K | 0.3% | 2026-Q1 |
| STATE STREET CORP added | 50,754 | $166K | 0.2% | 2026-Q1 |
| NORTHERN TRUST CORP added | 49,090 | $161K | 0.2% | 2026-Q1 |
| MORGAN STANLEY added | 36,088 | $118K | 0.2% | 2026-Q1 |
| XTX Topco Ltd new | 30,353 | $100K | 0.1% | 2026-Q1 |
| 683 Capital Management, LLC trimmed | 29,000 | $95K | 0.1% | 2026-Q1 |
| Qube Research & Technologies Ltd trimmed | 25,230 | $83K | 0.1% | 2026-Q1 |
| OSAIC HOLDINGS, INC. trimmed | 24,135 | $79K | 0.1% | 2026-Q1 |
| UBS Group AG added | 22,751 | $75K | 0.1% | 2026-Q1 |
| Engineers Gate Manager LP new | 18,253 | $60K | 0.1% | 2026-Q1 |
| Flatrock Wealth Partners LLC | 13,044 | $43K | 0.1% | 2026-Q1 |
| Point72 Asset Management, L.P. new | 12,250 | $40K | 0.1% | 2026-Q1 |
| OMERS ADMINISTRATION Corp trimmed | 10,500 | $34K | 0.1% | 2026-Q1 |
| Private Advisor Group, LLC | 10,416 | $34K | 0.1% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 5,775 | $19K | 0.0% | 2026-Q1 |
| Advisory Services Network, LLC new | 3,100 | $10K | 0.0% | 2026-Q1 |
| EverSource Wealth Advisors, LLC trimmed | 27 | $8K | 0.0% | 2026-Q1 |
| CITIGROUP INC added | 815 | $3K | 0.0% | 2026-Q1 |
| Ascentis Independent Advisors new | 450 | $1K | 0.0% | 2026-Q1 |
| SBI Securities Co., Ltd. | 185 | $607 | 0.0% | 2026-Q1 |
| JPMORGAN CHASE & CO | 154 | $393 | 0.0% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 64 | $210 | 0.0% | 2026-Q1 |
| Piscataqua Savings Bank | 25 | $81 | 0.0% | 2026-Q1 |
| Cassaday & Co Wealth Management LLC new | 10 | $33 | 0.0% | 2026-Q1 |
| ALBION FINANCIAL GROUP /UT | 7 | $23 | 0.0% | 2026-Q1 |
| Federation des caisses Desjardins du Quebec new | 1 | $3 | 0.0% | 2026-Q1 |
| Caitong International Asset Management Co., Ltd new | 1 | $3 | 0.0% | 2026-Q1 |
| Farther Finance Advisors, LLC new | 1 | $3 | 0.0% | 2026-Q1 |
| VANGUARD GROUP INC added | 526,675 | $4M | 5.9% | 2025-Q4 stale |
| JANE STREET GROUP, LLC new | 42,469 | $319K | 0.5% | 2025-Q4 stale |
| WEALTHEDGE INVESTMENT ADVISORS, LLC added | 73,971 | $226K | 0.3% | 2025-Q1 stale |
| GOLDMAN SACHS GROUP INC new | 23,965 | $180K | 0.3% | 2025-Q4 stale |
| CITADEL ADVISORS LLC added | 15,647 | $117K | 0.2% | 2025-Q4 stale |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 13,400 | $100K | 0.1% | 2025-Q4 stale |
| Defender Capital, LLC. new | 32,928 | $99K | 0.1% | 2025-Q2 stale |
| Hudson Bay Capital Management LP new | 13,061 | $98K | 0.1% | 2025-Q4 stale |
| SG Americas Securities, LLC new | 16,585 | $51K | 0.1% | 2025-Q1 stale |
| HRT FINANCIAL LP new | 10,149 | $31K | 0.0% | 2025-Q1 stale |
| RAYMOND JAMES FINANCIAL INC new | 1,189 | $4K | 0.0% | 2025-Q2 stale |
| ORG Partners LLC | 450 | $3K | 0.0% | 2025-Q4 stale |
| BANK OF AMERICA CORP /DE/ trimmed | 335 | $3K | 0.0% | 2025-Q4 stale |
| Tower Research Capital LLC (TRC) trimmed | 250 | $2K | 0.0% | 2025-Q4 stale |
| Wilmington Savings Fund Society, FSB | 250 | $765 | 0.0% | 2025-Q1 stale |
| Larson Financial Group LLC new | 125 | $383 | 0.0% | 2025-Q1 stale |
| FMR LLC trimmed | 5 | $15 | 0.0% | 2025-Q2 stale |
| WELLS FARGO & COMPANY/MN | 3 | $10 | 0.0% | 2025-Q3 stale |
| Global Retirement Partners, LLC | 1 | $8 | 0.0% | 2025-Q4 stale |
| Motiv8 Investments LLC new | 10 | — | 0.0% | 2025-Q4 stale |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 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.