Who owns MoonLake Immunotherapeutics (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-Q2 13F filings (latest filed 2026-09-22). 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
59 tracked funds added or opened MLTX while 37 trimmed or exited it between 2026-Q1 and 2026-Q2 — 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 8.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 7.9pp 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 2026-Q1 and 2026-Q2, across 165 tracked filers holding MLTX, 111 increased or opened the position and 65 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 2026-Q1 and 2026-Q2 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 17
- Jupiter Topco LLC$60M
- Trails Edge Capital Partners, LP$15M
- Capricorn Fund Managers Ltd$7M
- Burkehill Global Management, LP$5M
- Verition Fund Management LLC$4M
- Engineers Gate Manager LP$2M
Full exits 12
- JANUS HENDERSON GROUP PLC$64M
- HRT FINANCIAL LP$10M
- Jefferies Financial Group Inc.$9M
- Casdin Capital, LLC$8M
- First Turn Management, LLC$6M
- Ishara Investments LP$3M
Largest adds
- Logos Global Management LP$24M
- D. E. Shaw & Co., Inc.$21M
- Weiss Asset Management LP$18M
- Deep Track Capital, LP$17M
- CITADEL ADVISORS LLC$14M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$13M
Largest trims
- Cormorant Asset Management, LP$21M
- GOLDMAN SACHS GROUP INC$19M
- ADAR1 Capital Management, LLC$8M
- Holocene Advisors, LP$6M
- Longaeva Partners L.P.$4M
- PRICE T ROWE ASSOCIATES INC /MD/$4M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BVF INC/IL | 16,001,284 | $312M | 23.6% | 2026-Q2 |
| Deep Track Capital, LP added | 6,999,025 | $136M | 10.3% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 3,365,507 | $66M | 5.0% | 2026-Q2 |
| Cormorant Asset Management, LP trimmed | 3,205,433 | $62M | 4.7% | 2026-Q2 |
| Jupiter Topco LLC new | 3,085,906 | $60M | 4.6% | 2026-Q2 |
| Logos Global Management LP added | 2,675,000 | $52M | 3.9% | 2026-Q2 |
| Weiss Asset Management LP added | 2,581,813 | $50M | 3.8% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 1,972,893 | $38M | 2.9% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 1,715,349 | $33M | 2.5% | 2026-Q2 |
| MPM BIOIMPACT LLC trimmed | 1,606,967 | $31M | 2.4% | 2026-Q2 |
| Vivo Capital, LLC added | 1,400,000 | $27M | 2.1% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 1,386,422 | $28M | 2.1% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 1,158,732 | $23M | 1.7% | 2026-Q2 |
| BlackRock, Inc. added | 1,094,791 | $21M | 1.6% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 1,041,527 | $20M | 1.5% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 912,715 | $18M | 1.3% | 2026-Q2 |
| GREAT POINT PARTNERS LLC added | 855,813 | $17M | 1.3% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 853,386 | $17M | 1.3% | 2026-Q2 |
| Candriam S.C.A. trimmed | 769,766 | $15M | 1.1% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 751,897 | $15M | 1.1% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 750,777 | $15M | 1.1% | 2026-Q2 |
| Trails Edge Capital Partners, LP new | 750,000 | $15M | 1.1% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 643,268 | $13M | 0.9% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 636,187 | $12M | 0.9% | 2026-Q2 |
| MORGAN STANLEY trimmed | 563,602 | $11M | 0.8% | 2026-Q2 |
| MARSHALL WACE, LLP added | 550,351 | $11M | 0.8% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 496,242 | $10M | 0.7% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 386,960 | $8M | 0.6% | 2026-Q2 |
| Rhenman & Partners Asset Management AB added | 384,800 | $7M | 0.6% | 2026-Q2 |
| Trexquant Investment LP trimmed | 377,946 | $7M | 0.6% | 2026-Q2 |
| Capricorn Fund Managers Ltd new | 374,866 | $7M | 0.6% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 358,884 | $7M | 0.5% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 341,537 | $7M | 0.5% | 2026-Q2 |
| Jump Financial, LLC added | 336,243 | $7M | 0.5% | 2026-Q2 |
| UBS Group AG added | 328,522 | $6M | 0.5% | 2026-Q2 |
| Granahan Investment Management, LLC added | 313,884 | $6M | 0.5% | 2026-Q2 |
| Boxer Capital Management, LLC | 275,000 | $5M | 0.4% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC | 253,974 | $5M | 0.4% | 2026-Q2 |
| Burkehill Global Management, LP new | 250,000 | $5M | 0.4% | 2026-Q2 |
| Holocene Advisors, LP trimmed | 250,000 | $5M | 0.4% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 247,742 | $5M | 0.4% | 2026-Q2 |
| Walleye Capital LLC trimmed | 246,869 | $5M | 0.4% | 2026-Q2 |
| J. Goldman & Co LP added | 215,945 | $4M | 0.3% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd added | 215,849 | $4M | 0.3% | 2026-Q2 |
| ACUTA CAPITAL PARTNERS, LLC added | 215,652 | $4M | 0.3% | 2026-Q2 |
| Verition Fund Management LLC trimmed | 207,102 | $4M | 0.3% | 2026-Q2 |
| HighVista Strategies LLC trimmed | 187,946 | $4M | 0.3% | 2026-Q2 |
| RICE HALL JAMES & ASSOCIATES, LLC added | 183,801 | $4M | 0.3% | 2026-Q2 |
| CONGRESS ASSET MANAGEMENT CO added | 180,448 | $4M | 0.3% | 2026-Q2 |
| Kalehua Capital Management LLC | 175,734 | $3M | 0.3% | 2026-Q2 |
| Voleon Capital Management LP trimmed | 173,909 | $3M | 0.3% | 2026-Q2 |
| Exome Asset Management LLC trimmed | 166,493 | $3M | 0.2% | 2026-Q2 |
| Longaeva Partners L.P. trimmed | 161,557 | $3M | 0.2% | 2026-Q2 |
| XTX Topco Ltd added | 152,472 | $3M | 0.2% | 2026-Q2 |
| FMR LLC | 143,559 | $3M | 0.2% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 130,327 | $3M | 0.2% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 129,434 | $3M | 0.2% | 2026-Q2 |
| TD Asset Management Inc trimmed | 128,274 | $2M | 0.2% | 2026-Q2 |
| Engineers Gate Manager LP added | 111,590 | $2M | 0.2% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. new | 110,000 | $2M | 0.2% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 109,580 | $2M | 0.2% | 2026-Q2 |
| Quadrature Capital Ltd added | 109,204 | $2M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 105,739 | $2M | 0.2% | 2026-Q2 |
| Polymer Capital Management (HK) LTD new | 100,463 | $2M | 0.1% | 2026-Q2 |
| Ghisallo Capital Management LLC new | 100,000 | $2M | 0.1% | 2026-Q2 |
| HEIGHTS CAPITAL MANAGEMENT, INC new | 100,000 | $2M | 0.1% | 2026-Q2 |
| SummitTX Capital, L.P. new | 99,371 | $2M | 0.1% | 2026-Q2 |
| Jain Global LLC added | 99,126 | $2M | 0.1% | 2026-Q2 |
| STATE STREET CORP added | 87,166 | $2M | 0.1% | 2026-Q2 |
| Swiss National Bank added | 87,100 | $2M | 0.1% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 85,147 | $2M | 0.1% | 2026-Q2 |
| Monashee Investment Management LLC added | 75,000 | $1M | 0.1% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 74,760 | $1M | 0.1% | 2026-Q2 |
| Mariner, LLC added | 72,875 | $1M | 0.1% | 2026-Q2 |
| Lion Point Capital, LP | 67,500 | $1M | 0.1% | 2026-Q2 |
| CAPITAL FUND MANAGEMENT S.A. added | 65,394 | $1M | 0.1% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL trimmed | 58,740 | $1M | 0.1% | 2026-Q2 |
| Headlands Technologies LLC trimmed | 57,087 | $1M | 0.1% | 2026-Q2 |
| Stonepine Capital Management, LLC new | 50,000 | $974K | 0.1% | 2026-Q2 |
| Nuveen, LLC added | 48,835 | $951K | 0.1% | 2026-Q2 |
| ExodusPoint Capital Management, LP trimmed | 46,646 | $908K | 0.1% | 2026-Q2 |
| NORTHERN TRUST CORP added | 45,660 | $889K | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 37,839 | $737K | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 36,195 | $705K | 0.1% | 2026-Q2 |
| FRED ALGER MANAGEMENT, LLC trimmed | 32,254 | $628K | 0.0% | 2026-Q2 |
| Campbell & CO Investment Adviser LLC added | 29,678 | $578K | 0.0% | 2026-Q2 |
| Aquatic Capital Management LLC added | 28,134 | $548K | 0.0% | 2026-Q2 |
| Quantbot Technologies LP added | 27,807 | $541K | 0.0% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC trimmed | 27,575 | $537K | 0.0% | 2026-Q2 |
| ADAR1 Capital Management, LLC trimmed | 27,000 | $526K | 0.0% | 2026-Q2 |
| FOX RUN MANAGEMENT, L.L.C. added | 26,590 | $518K | 0.0% | 2026-Q2 |
| PRELUDE CAPITAL MANAGEMENT, LLC trimmed | 25,997 | $506K | 0.0% | 2026-Q2 |
| IEQ CAPITAL, LLC new | 24,855 | $484K | 0.0% | 2026-Q2 |
| Sound Capital Solutions LLC new | 24,335 | $474K | 0.0% | 2026-Q2 |
| OPTIMIZE FINANCIAL INC. trimmed | 24,335 | $474K | 0.0% | 2026-Q2 |
| IMC-Chicago, LLC added | 23,048 | $449K | 0.0% | 2026-Q2 |
| Graham Capital Management, L.P. added | 21,545 | $419K | 0.0% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 21,128 | $411K | 0.0% | 2026-Q2 |
| Legal & General Group Plc added | 21,044 | $410K | 0.0% | 2026-Q2 |
| Entropy Technologies, LP added | 19,827 | $386K | 0.0% | 2026-Q2 |
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.