Who owns MLTX (MLTX)
Which tracked institutional funds hold MLTX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MLTX 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
68 tracked funds added or opened MLTX while 25 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
MLTX’s largest tracked holder by dollar value, BVF INC/IL, sizes it at 9.5% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 9.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MLTX 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 146 tracked filers holding MLTX, 88 increased or opened the position and 68 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
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 MLTX 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 19
- MPM BIOIMPACT LLC$34M
- Holocene Advisors, LP$11M
- GREAT POINT PARTNERS LLC$9M
- ADAR1 Capital Management, LLC$9M
- Casdin Capital, LLC$8M
- Longaeva Partners L.P.$8M
Full exits 9
- Soleus Capital Management, L.P.$5M
- STEMPOINT CAPITAL LP$5M
- VANGUARD GROUP INC$4M
- Eagle Health Investments LP$2M
- TWO SIGMA ADVISERS, LP$2M
- AMERIPRISE FINANCIAL INC$2M
Largest adds
- Deep Track Capital, LP$59M
- BVF INC/IL$38M
- JANUS HENDERSON GROUP PLC$37M
- Weiss Asset Management LP$27M
- Cormorant Asset Management, LP$26M
- CITADEL ADVISORS LLC$20M
Largest trims
- JANE STREET GROUP, LLC$14M
- Nuveen, LLC$8M
- Schonfeld Strategic Advisors LLC$4M
- UBS Group AG$3M
- MORGAN STANLEY$2M
- DIMENSIONAL FUND ADVISORS LP$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 |
|---|---|---|---|---|
| BVF INC/IL trimmed | 16,001,284 | $298M | 18.0% | 2026-Q1 |
| Deep Track Capital, LP added | 6,408,863 | $119M | 7.2% | 2026-Q1 |
| Cormorant Asset Management, LP added | 4,480,433 | $84M | 5.1% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 3,451,628 | $64M | 3.9% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 2,390,661 | $45M | 2.7% | 2026-Q1 |
| MPM BIOIMPACT LLC added | 1,811,082 | $34M | 2.0% | 2026-Q1 |
| Weiss Asset Management LP added | 1,708,328 | $32M | 1.9% | 2026-Q1 |
| Logos Global Management LP trimmed | 1,500,000 | $28M | 1.7% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 1,368,518 | $26M | 1.5% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 1,323,728 | $25M | 1.5% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 1,294,861 | $24M | 1.5% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,130,233 | $21M | 1.3% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 1,122,312 | $21M | 1.3% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 1,065,610 | $20M | 1.2% | 2026-Q1 |
| BlackRock, Inc. added | 1,021,851 | $19M | 1.2% | 2026-Q1 |
| Vivo Capital, LLC | 1,000,000 | $19M | 1.1% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 1,088,514 | $18M | 1.1% | 2026-Q1 |
| Candriam S.C.A. added | 818,126 | $15M | 0.9% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 724,794 | $14M | 0.8% | 2026-Q1 |
| MORGAN STANLEY trimmed | 614,482 | $11M | 0.7% | 2026-Q1 |
| Holocene Advisors, LP added | 600,000 | $11M | 0.7% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 576,092 | $11M | 0.6% | 2026-Q1 |
| Jefferies Financial Group Inc. | 500,000 | $9M | 0.6% | 2026-Q1 |
| GREAT POINT PARTNERS LLC added | 500,000 | $9M | 0.6% | 2026-Q1 |
| Trexquant Investment LP added | 495,336 | $9M | 0.6% | 2026-Q1 |
| ADAR1 Capital Management, LLC added | 457,137 | $9M | 0.5% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 453,625 | $8M | 0.5% | 2026-Q1 |
| Casdin Capital, LLC new | 450,000 | $8M | 0.5% | 2026-Q1 |
| Longaeva Partners L.P. new | 410,000 | $8M | 0.5% | 2026-Q1 |
| Voleon Capital Management LP trimmed | 373,021 | $7M | 0.4% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 341,424 | $6M | 0.4% | 2026-Q1 |
| Jump Financial, LLC trimmed | 325,968 | $6M | 0.4% | 2026-Q1 |
| Walleye Capital LLC added | 320,472 | $6M | 0.4% | 2026-Q1 |
| First Turn Management, LLC added | 315,563 | $6M | 0.4% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 276,772 | $5M | 0.3% | 2026-Q1 |
| Boxer Capital Management, LLC | 275,000 | $5M | 0.3% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC | 253,974 | $5M | 0.3% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 239,838 | $4M | 0.3% | 2026-Q1 |
| Rhenman & Partners Asset Management AB trimmed | 239,500 | $4M | 0.3% | 2026-Q1 |
| Granahan Investment Management, LLC added | 220,600 | $4M | 0.2% | 2026-Q1 |
| Exome Asset Management LLC added | 215,376 | $4M | 0.2% | 2026-Q1 |
| HighVista Strategies LLC added | 193,955 | $4M | 0.2% | 2026-Q1 |
| ACUTA CAPITAL PARTNERS, LLC added | 191,760 | $4M | 0.2% | 2026-Q1 |
| CONGRESS ASSET MANAGEMENT CO added | 178,555 | $3M | 0.2% | 2026-Q1 |
| Kalehua Capital Management LLC | 175,734 | $3M | 0.2% | 2026-Q1 |
| Ishara Investments LP new | 174,250 | $3M | 0.2% | 2026-Q1 |
| RICE HALL JAMES & ASSOCIATES, LLC added | 167,766 | $3M | 0.2% | 2026-Q1 |
| ALGERT GLOBAL LLC trimmed | 151,256 | $3M | 0.2% | 2026-Q1 |
| READYSTATE ASSET MANAGEMENT LP new | 144,238 | $3M | 0.2% | 2026-Q1 |
| FMR LLC trimmed | 143,559 | $3M | 0.2% | 2026-Q1 |
| TD Asset Management Inc added | 142,706 | $3M | 0.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 139,574 | $3M | 0.2% | 2026-Q1 |
| J. Goldman & Co LP added | 136,900 | $3M | 0.2% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd added | 127,087 | $2M | 0.1% | 2026-Q1 |
| ExodusPoint Capital Management, LP trimmed | 120,310 | $2M | 0.1% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 118,961 | $2M | 0.1% | 2026-Q1 |
| XTX Topco Ltd added | 112,044 | $2M | 0.1% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 110,217 | $2M | 0.1% | 2026-Q1 |
| MARSHALL WACE, LLP trimmed | 107,331 | $2M | 0.1% | 2026-Q1 |
| Headlands Technologies LLC added | 97,133 | $2M | 0.1% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 95,339 | $2M | 0.1% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP trimmed | 80,233 | $1M | 0.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 74,162 | $1M | 0.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 72,269 | $1M | 0.1% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP new | 70,140 | $1M | 0.1% | 2026-Q1 |
| Lion Point Capital, LP | 67,500 | $1M | 0.1% | 2026-Q1 |
| WESTFIELD CAPITAL MANAGEMENT CO LP trimmed | 1,259,376 | $59M | 3.6% | 2025-Q2 stale |
| FEDERATED HERMES, INC. trimmed | 1,248,573 | $59M | 3.6% | 2025-Q2 stale |
| ALLIANCEBERNSTEIN L.P. added | 1,138,022 | $54M | 3.3% | 2025-Q2 stale |
| Paradigm Biocapital Advisors LP added | 878,323 | $41M | 2.5% | 2025-Q2 stale |
| RTW INVESTMENTS, LP added | 741,090 | $35M | 2.1% | 2025-Q2 stale |
| Hood River Capital Management LLC added | 675,445 | $32M | 1.9% | 2025-Q2 stale |
| Vestal Point Capital, LP added | 550,000 | $26M | 1.6% | 2025-Q2 stale |
| Siren, L.L.C. new | 508,267 | $24M | 1.5% | 2025-Q2 stale |
| Camber Capital Management LP | 441,000 | $17M | 1.0% | 2025-Q1 stale |
| Finepoint Capital LP trimmed | 435,785 | $17M | 1.0% | 2025-Q1 stale |
| Avoro Capital Advisors LLC trimmed | 2,000,000 | $14M | 0.9% | 2025-Q3 stale |
| FRED ALGER MANAGEMENT, LLC trimmed | 295,623 | $14M | 0.8% | 2025-Q2 stale |
| Saturn V Capital Management LP trimmed | 290,784 | $14M | 0.8% | 2025-Q2 stale |
| 5AM Venture Management, LLC | 282,313 | $13M | 0.8% | 2025-Q2 stale |
| Polar Capital Holdings Plc trimmed | 247,500 | $12M | 0.7% | 2025-Q2 stale |
| Voya Investment Management LLC trimmed | 246,114 | $12M | 0.7% | 2025-Q2 stale |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 1,500,000 | $11M | 0.7% | 2025-Q3 stale |
| Integral Health Asset Management, LLC | 200,000 | $9M | 0.6% | 2025-Q2 stale |
| Octagon Capital Advisors LP trimmed | 148,000 | $7M | 0.4% | 2025-Q2 stale |
| Soleus Capital Management, L.P. new | 400,000 | $5M | 0.3% | 2025-Q4 stale |
| STEMPOINT CAPITAL LP added | 348,401 | $5M | 0.3% | 2025-Q4 stale |
| AXA S.A. trimmed | 83,839 | $4M | 0.2% | 2025-Q2 stale |
| VANGUARD GROUP INC added | 266,150 | $4M | 0.2% | 2025-Q4 stale |
| Ikarian Capital, LLC new | 435,839 | $3M | 0.2% | 2025-Q3 stale |
| JENNISON ASSOCIATES LLC new | 62,318 | $3M | 0.2% | 2025-Q2 stale |
| Moody Aldrich Partners LLC trimmed | 54,416 | $3M | 0.2% | 2025-Q2 stale |
| Eagle Health Investments LP new | 187,600 | $2M | 0.1% | 2025-Q4 stale |
| Verition Fund Management LLC added | 272,768 | $2M | 0.1% | 2025-Q3 stale |
| BOOTHBAY FUND MANAGEMENT, LLC new | 258,779 | $2M | 0.1% | 2025-Q3 stale |
| Nicholas Investment Partners, LP new | 46,933 | $2M | 0.1% | 2025-Q1 stale |
| TWO SIGMA ADVISERS, LP added | 131,700 | $2M | 0.1% | 2025-Q4 stale |
| AMERIPRISE FINANCIAL INC added | 130,964 | $2M | 0.1% | 2025-Q4 stale |
| SEI INVESTMENTS CO added | 29,662 | $1M | 0.1% | 2025-Q2 stale |
| Decheng Capital LLC | 181,600 | $1M | 0.1% | 2025-Q3 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.