Who owns TMDX
Which tracked institutional funds hold TMDX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See TMDX company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 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
55 tracked funds added or opened TMDX while 150 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
TMDX’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 TMDX 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 415 tracked filers holding TMDX, 217 increased or opened the position and 217 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 TMDX 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 23
- VANGUARD PORTFOLIO MANAGEMENT LLC$191M
- VANGUARD CAPITAL MANAGEMENT LLC$147M
- VANGUARD FIDUCIARY TRUST CO$23M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$13M
- ExodusPoint Capital Management, LP$11M
- Longaeva Partners L.P.$7M
Full exits 27
- VANGUARD GROUP INC$432M
- TWO SIGMA ADVISERS, LP$44M
- STATE OF MICHIGAN RETIREMENT SYSTEM$13M
- Schonfeld Strategic Advisors LLC$11M
- Lisanti Capital Growth, LLC$7M
- Parkman Healthcare Partners LLC$5M
Largest adds
- CITIGROUP INC$27M
- Invesco Ltd.$17M
- MILLENNIUM MANAGEMENT LLC$12M
- Capital World Investors$10M
- ENVESTNET ASSET MANAGEMENT INC$6M
- AMERICAN CENTURY COMPANIES INC$4M
Largest trims
- BlackRock, Inc.$290M
- FMR LLC$117M
- Driehaus Capital Management LLC$83M
- PRICE T ROWE ASSOCIATES INC /MD/$35M
- GOLDMAN SACHS GROUP INC$31M
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$28M
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 | 5,034,477 | $500M | 12.2% | 2026-Q1 |
| BlackRock, Inc. trimmed | 3,689,166 | $367M | 8.9% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 1,919,535 | $191M | 4.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,478,152 | $147M | 3.6% | 2026-Q1 |
| STATE STREET CORP added | 1,319,479 | $131M | 3.2% | 2026-Q1 |
| Invesco Ltd. added | 1,009,651 | $100M | 2.4% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 939,523 | $93M | 2.3% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. added | 885,841 | $88M | 2.1% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 866,282 | $86M | 2.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 839,155 | $83M | 2.0% | 2026-Q1 |
| Hood River Capital Management LLC added | 699,770 | $70M | 1.7% | 2026-Q1 |
| MORGAN STANLEY added | 694,150 | $69M | 1.7% | 2026-Q1 |
| UBS Group AG trimmed | 580,793 | $58M | 1.4% | 2026-Q1 |
| EVENTIDE ASSET MANAGEMENT, LLC added | 548,824 | $55M | 1.3% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 516,679 | $51M | 1.3% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP added | 468,214 | $47M | 1.1% | 2026-Q1 |
| Capital World Investors added | 374,177 | $37M | 0.9% | 2026-Q1 |
| CITIGROUP INC added | 357,381 | $36M | 0.9% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 346,683 | $34M | 0.8% | 2026-Q1 |
| WASATCH ADVISORS LP added | 346,144 | $34M | 0.8% | 2026-Q1 |
| EMERALD ADVISERS, LLC trimmed | 342,791 | $34M | 0.8% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 338,159 | $34M | 0.8% | 2026-Q1 |
| BRAIDWELL LP added | 329,391 | $33M | 0.8% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 325,140 | $32M | 0.8% | 2026-Q1 |
| FRONTIER CAPITAL MANAGEMENT CO LLC added | 320,471 | $32M | 0.8% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 318,926 | $32M | 0.8% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 306,080 | $30M | 0.7% | 2026-Q1 |
| BAILLIE GIFFORD & CO trimmed | 305,194 | $30M | 0.7% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 295,176 | $29M | 0.7% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 308,341 | $29M | 0.7% | 2026-Q1 |
| ZEVENBERGEN CAPITAL INVESTMENTS LLC added | 286,521 | $28M | 0.7% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 273,801 | $27M | 0.7% | 2026-Q1 |
| ROYCE & ASSOCIATES LP added | 244,382 | $24M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 236,394 | $23M | 0.6% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 231,433 | $23M | 0.6% | 2026-Q1 |
| EMERALD MUTUAL FUND ADVISERS TRUST trimmed | 229,326 | $23M | 0.6% | 2026-Q1 |
| LORD, ABBETT & CO. LLC trimmed | 213,973 | $21M | 0.5% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 211,368 | $21M | 0.5% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 195,433 | $19M | 0.5% | 2026-Q1 |
| BARCLAYS PLC trimmed | 190,578 | $19M | 0.5% | 2026-Q1 |
| BLAIR WILLIAM & CO/IL added | 174,017 | $17M | 0.4% | 2026-Q1 |
| ArrowMark Colorado Holdings LLC trimmed | 171,068 | $17M | 0.4% | 2026-Q1 |
| Candriam S.C.A. added | 158,766 | $16M | 0.4% | 2026-Q1 |
| Man Group plc added | 158,409 | $16M | 0.4% | 2026-Q1 |
| Davidson Kempner Capital Management LP | 146,400 | $15M | 0.4% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 144,529 | $14M | 0.4% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 133,875 | $13M | 0.3% | 2026-Q1 |
| FirstWave Capital Management LLC added | 124,268 | $12M | 0.3% | 2026-Q1 |
| Public Sector Pension Investment Board added | 122,255 | $12M | 0.3% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 116,546 | $12M | 0.3% | 2026-Q1 |
| ExodusPoint Capital Management, LP trimmed | 115,345 | $11M | 0.3% | 2026-Q1 |
| OPPENHEIMER & CO INC trimmed | 113,472 | $11M | 0.3% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 115,035 | $11M | 0.3% | 2026-Q1 |
| Trexquant Investment LP added | 106,300 | $11M | 0.3% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 104,714 | $10M | 0.3% | 2026-Q1 |
| Bellevue Group AG added | 101,139 | $10M | 0.2% | 2026-Q1 |
| BROWN CAPITAL MANAGEMENT LLC trimmed | 97,954 | $10M | 0.2% | 2026-Q1 |
| NEXT CENTURY GROWTH INVESTORS LLC trimmed | 96,445 | $10M | 0.2% | 2026-Q1 |
| RENAISSANCE GROUP LLC added | 93,543 | $9M | 0.2% | 2026-Q1 |
| Lagoda Investment Management, L.P. trimmed | 90,530 | $9M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 89,824 | $9M | 0.2% | 2026-Q1 |
| CREDIT AGRICOLE S A added | 87,389 | $9M | 0.2% | 2026-Q1 |
| Legal & General Group Plc trimmed | 78,753 | $8M | 0.2% | 2026-Q1 |
| Montanaro Asset Management Ltd trimmed | 78,739 | $8M | 0.2% | 2026-Q1 |
| Nuveen, LLC added | 78,419 | $8M | 0.2% | 2026-Q1 |
| Ensign Peak Advisors, Inc trimmed | 75,569 | $8M | 0.2% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 73,488 | $7M | 0.2% | 2026-Q1 |
| SEI INVESTMENTS CO added | 69,629 | $7M | 0.2% | 2026-Q1 |
| BANK OF MONTREAL /CAN/ trimmed | 69,366 | $7M | 0.2% | 2026-Q1 |
| Longaeva Partners L.P. new | 69,057 | $7M | 0.2% | 2026-Q1 |
| LAZARD ASSET MANAGEMENT LLC added | 64,794 | $6M | 0.2% | 2026-Q1 |
| Swiss National Bank added | 64,200 | $6M | 0.2% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 62,595 | $6M | 0.2% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC added | 61,630 | $6M | 0.1% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 61,601 | $6M | 0.1% | 2026-Q1 |
| Bastion Asset Management Inc. trimmed | 55,463 | $6M | 0.1% | 2026-Q1 |
| Biondo Investment Advisors, LLC added | 57,970 | $6M | 0.1% | 2026-Q1 |
| PEREGRINE CAPITAL MANAGEMENT LLC trimmed | 57,184 | $6M | 0.1% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 53,889 | $5M | 0.1% | 2026-Q1 |
| Engineers Gate Manager LP added | 52,625 | $5M | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 42,764 | $5M | 0.1% | 2026-Q1 |
| FEDERATED HERMES, INC. added | 51,386 | $5M | 0.1% | 2026-Q1 |
| Integrated Advisors Network LLC new | 47,590 | $5M | 0.1% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 47,275 | $5M | 0.1% | 2026-Q1 |
| KING LUTHER CAPITAL MANAGEMENT CORP added | 47,084 | $5M | 0.1% | 2026-Q1 |
| BESSEMER GROUP INC added | 45,821 | $5M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 3,554,461 | $432M | 10.6% | 2025-Q4 stale |
| FIL Ltd trimmed | 1,055,553 | $141M | 3.5% | 2025-Q2 stale |
| MACQUARIE GROUP LTD trimmed | 906,268 | $102M | 2.5% | 2025-Q3 stale |
| Liontrust Investment Partners LLP | 523,748 | $70M | 1.7% | 2025-Q3 stale |
| TWO SIGMA ADVISERS, LP trimmed | 362,300 | $44M | 1.1% | 2025-Q4 stale |
| STATE OF MICHIGAN RETIREMENT SYSTEM | 108,000 | $13M | 0.3% | 2025-Q4 stale |
| Schonfeld Strategic Advisors LLC added | 91,065 | $11M | 0.3% | 2025-Q4 stale |
| JANE STREET GROUP, LLC trimmed | 78,156 | $9M | 0.2% | 2025-Q3 stale |
| WOLVERINE TRADING, LLC added | 65,578 | $7M | 0.2% | 2025-Q3 stale |
| First Light Asset Management, LLC trimmed | 107,860 | $7M | 0.2% | 2025-Q1 stale |
| Lisanti Capital Growth, LLC trimmed | 56,751 | $7M | 0.2% | 2025-Q4 stale |
| Eagle Health Investments LP added | 100,661 | $7M | 0.2% | 2025-Q1 stale |
| BALYASNY ASSET MANAGEMENT L.P. added | 54,305 | $6M | 0.1% | 2025-Q3 stale |
| Parkman Healthcare Partners LLC trimmed | 45,174 | $5M | 0.1% | 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.