JANUX THERAPEUTICS INC JANX
COM · Common Stock · CUSIP 47103J105
- SectorHealth care
- IndustryPharmaceutical Preparations
- HeadquartersSan Diego, CA
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($66.4k this quarter). Holder counts are more reliable. Shares outstanding: 61.1m as of 2026-08-04, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $15.35. Options: 8 managers hold calls ($4.4m notional), 7 hold puts ($3.7m).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 49 |
| Q4 2022 | 51 |
| Q1 2023 | 49 |
| Q2 2023 | 55 |
| Q3 2023 | 59 |
| Q4 2023 | 66 |
| Q1 2024 | 122 |
| Q2 2024 | 156 |
| Q3 2024 | 161 |
| Q4 2024 | 218 |
| Q1 2025 | 184 |
| Q2 2025 | 176 |
| Q3 2025 | 175 |
| Q4 2025 | 177 |
| Q1 2026 | 190 |
| Q2 2026 | 198 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 84 | 78 |
| Q4 2024 | 144 | 64 |
| Q1 2025 | 113 | 94 |
| Q2 2025 | 95 | 75 |
| Q3 2025 | 80 | 84 |
| Q4 2025 | 110 | 79 |
| Q1 2026 | 105 | 84 |
| Q2 2026 | 121 | 74 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $14.6m | $5.4m | 0.37 |
| Q4 2025 | $6.1m | $13.2m | 2.18 |
| Q1 2026 | $7.2m | $6.7m | 0.93 |
| Q2 2026 | $4.4m | $3.7m | 0.83 |
Biggest buyers
| FEDERATED HERMES, INC. | Added | +2.3m |
| TWO SIGMA INVESTMENTS, LP | Added | +1.1m |
| D. E. Shaw & Co., Inc. | Added | +998.1k |
| CITADEL ADVISORS LLC | Added | +848.6k |
| Point72 Asset Management, L.P. | Added | +837.7k |
| Nantahala Capital Management, LLC | Added | +809.9k |
| BlackRock, Inc. | Added | +701.4k |
| ALGERT GLOBAL LLC | Added | +667.5k |
| STATE STREET CORP | Added | +540.9k |
| Qube Research & Technologies Ltd | Added | +504.9k |
Biggest sellers
| Deep Track Capital, LP | Sold out | -1.2m |
| Logos Global Management LP | Sold out | -1.0m |
| Balyasny Asset Management L.P. | Reduced | -878.5k |
| Irenic Capital Management LP | Sold out | -765.8k |
| TANG CAPITAL MANAGEMENT LLC | Sold out | -500.0k |
| ORBIMED ADVISORS LLC | Reduced | -458.9k |
| Woodline Partners LP | Reduced | -368.0k |
| SCHRODER INVESTMENT MANAGEMENT GROUP | Sold out | -195.2k |
| FMR LLC | Reduced | -122.9k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Sold out | -119.1k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $1.7m113.6k shares |
| JANE STREET GROUP, LLC | Added | $1.2m75.9k shares |
| CITADEL ADVISORS LLC | Reduced | $589.8k38.4k shares |
| Walleye Capital LLC | Reduced | $459.3k29.9k shares |
| SIMPLEX TRADING, LLC | Reduced | $264.2k17.2k shares |
| Caption Management, LLC | Added | $178.2k11.6k shares |
| GROUP ONE TRADING LLC | Reduced | $36.9k2.4k shares |
| CITIGROUP INC | New | $3.1k200 shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $2.4m156.5k shares |
| CITADEL ADVISORS LLC | Reduced | $394.8k25.7k shares |
| SIMPLEX TRADING, LLC | Added | $337.9k22.0k shares |
| HRT FINANCIAL LP | Reduced | $265.0k17.3k shares |
| GROUP ONE TRADING LLC | Added | $156.7k10.2k shares |
| Walleye Capital LLC | Added | $147.5k9.6k shares |
| CITIGROUP INC | New | $3.1k200 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| RA CAPITAL MANAGEMENT, L.P. 13D · may seek influence filed 2025-03-10 | 19.9% |
| BlackRock, Inc. 13G · institution +1.0 pts · filed 2026-07-28 | 6.7% |
| Prosight Management, LP 13G · passive investor new · filed 2026-02-06 | 5.3% |
Fell to 5% or below in the last year: Point72 Asset Management, L.P. (3.3%, 2026-08-14), Janus Henderson Group Ltd. (0.3%, 2026-08-13), STATE STREET CORP (4.1%, 2026-05-12), FMR LLC (4.2%, 2026-05-06)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 1 | $53.7m | 1 | $5.0m | $5.0m |
| Q1 2025 | 1 | $25.3m | 2 | $1.3m | $548.2k |
| Q2 2025 | 0 | — | 1 | $206.8k | $206.8k |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 1 | $710.9k | $710.9k |
| Q1 2026 | 0 | — | 6 | $261.3k | — |
| Q2 2026 | 0 | — | 2 | $85.8k | — |
| Q3 2026 | 0 | — | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-06-02 | Doyle Janeen Noel Chief Corp. & Bus. Dev. Ofcr | Sold | $56.9k4.1k shares |
| 2026-05-11 | Dobek Maria Vice President, Accounting | Sold | $28.9k2.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. 1.49% of their portfolio | 11.2m $171.9m | Unchanged |
| BlackRock, Inc. 0.00% of their portfolio | 6.1m $94.2m | Added +701.4k |
| Prosight Management, LP 10.07% of their portfolio | 3.8m $58.4m | Added +254.5k |
| STATE STREET CORP 0.00% of their portfolio | 3.0m $46.2m | Added +540.9k |
| FMR LLC 0.00% of their portfolio | 2.4m $37.1m | Reduced -122.9k |
| FEDERATED HERMES, INC. 0.05% of their portfolio | 2.4m $36.1m | Added +2.3m |
| Point72 Asset Management, L.P. 0.05% of their portfolio | 2.0m $30.6m | Added +837.7k |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 1.9m $28.5m | Added +46.0k |
| TCG Crossover Management, LLC 0.66% of their portfolio | 1.8m $27.5m | Unchanged |
| Alyeska Investment Group, L.P. 0.07% of their portfolio | 1.6m $25.3m | Added +46.1k |
| Nantahala Capital Management, LLC 0.75% of their portfolio | 1.6m $24.9m | Added +809.9k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 1.5m $23.2m | Reduced -90.3k |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.00% of their portfolio | 1.3m $20.4m | Added +40.5k |
| TWO SIGMA INVESTMENTS, LP 0.01% of their portfolio | 1.2m $18.5m | Added +1.1m |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 1.2m $18.5m | Added +57.4k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 1.2m $18.4m | Added +848.6k |
| ALGERT GLOBAL LLC 0.20% of their portfolio | 1.1m $17.1m | Added +667.5k |
| D. E. Shaw & Co., Inc. 0.01% of their portfolio | 1.1m $16.8m | Added +998.1k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 952.7k $14.6m | Added +350.7k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 910.5k $14.0m | Added +108.8k |
| MORGAN STANLEY 0.00% of their portfolio | 837.0k $12.9m | Added +133.0k |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 702.1k $10.8m | Added +504.9k |
| Squarepoint Ops LLC 0.02% of their portfolio | 532.3k $8.2m | Reduced -71.7k |
| ORBIMED ADVISORS LLC 0.15% of their portfolio | 524.7k $8.1m | Reduced -458.9k |
| MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio | 504.5k $7.7m | Added +117.7k |
| HRT FINANCIAL LP 0.02% of their portfolio | 491.0k $7.5m | Added +124.3k |
| ADAR1 Capital Management, LLC 0.30% of their portfolio | 420.9k $6.5m | Added +122.3k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 398.4k $6.1m | Added +36.2k |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 392.0k $6.0m | Added +140.3k |
| Nationale-Nederlanden Powszechne Towarzystwo Emerytalne S.A. 0.32% of their portfolio | 376.5k $5.8m | Unchanged |
| Woodline Partners LP 0.02% of their portfolio | 370.0k $5.7m | Reduced -368.0k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 369.2k $5.7m | Added +14.9k |
| Rock Springs Capital Management LP 0.28% of their portfolio | 367.0k $5.6m | Unchanged |
| Jump Financial, LLC 0.05% of their portfolio | 361.7k $5.6m | Added +139.9k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 359.7k $5.5m | Added +263.1k |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 315.3k $4.8m | Added +1.6k |
| PANAGORA ASSET MANAGEMENT INC 0.01% of their portfolio | 269.1k $4.1m | New |
| Man Group plc 0.01% of their portfolio | 248.8k $3.8m | Reduced -94.2k |
| Balyasny Asset Management L.P. 0.01% of their portfolio | 211.6k $3.3m | Reduced -878.5k |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 209.6k $3.2m | Added +104.3k |
| Y-Intercept (Hong Kong) Ltd 0.06% of their portfolio | 196.5k $3.0m | Added +56.5k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 178.5k $2.7m | Reduced -50.7k |
| Jupiter Topco LLC 0.00% of their portfolio | 172.2k $2.6m | First filing |
| Allspring Global Investments Holdings, LLC 0.00% of their portfolio | 166.1k $2.4m | Reduced -2.9k |
| BML Capital Management, LLC 1.36% of their portfolio | 155.0k $2.4m | Unchanged |
| UBS Group AG 0.00% of their portfolio | 150.7k $2.3m | Reduced -69.1k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 135.1k $2.1m | Added +15.2k |
| Connor, Clark & Lunn Investment Management Ltd. 0.00% of their portfolio | 133.9k $2.1m | Added +14.5k |
| Thrivent Financial for Lutherans 0.00% of their portfolio | 115.0k $1.8m | New |
| AQR CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 108.1k $1.7m | New |
| FRANKLIN RESOURCES INC 0.00% of their portfolio | 105.3k $1.6m | Added +15.2k |
| CAPITAL FUND MANAGEMENT S.A. 0.01% of their portfolio | 102.0k $1.6m | Reduced -13.9k |
| Rangeley Capital, LLC 1.40% of their portfolio | 98.0k $1.5m | Reduced -24.5k |
| Nuveen, LLC 0.00% of their portfolio | 97.1k $1.5m | Unchanged |
| WINTON GROUP Ltd 0.04% of their portfolio | 90.3k $1.4m | Added +21.8k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 85.0k $1.3m | Added +26.2k |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 81.6k $1.3m | Added +38.7k |
| Swiss National Bank 0.00% of their portfolio | 79.3k $1.2m | Added +2.2k |
| XTX Topco Ltd 0.02% of their portfolio | 77.2k $1.2m | Added +34.4k |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. 0.00% of their portfolio | 76.6k $1.2m | Unchanged |
| Quantinno Capital Management LP 0.00% of their portfolio | 70.2k $1.1m | Added +44.2k |
| CITIGROUP INC 0.00% of their portfolio | 70.2k $1.1m | Added +58.5k |
| CONGRESS ASSET MANAGEMENT CO 0.01% of their portfolio | 67.6k $1.0m | Added +743 |
| BARCLAYS PLC 0.00% of their portfolio | 63.7k $978.1k | Added +7.7k |
| Trexquant Investment LP 0.01% of their portfolio | 63.4k $973.1k | New |
| Walleye Capital LLC 0.00% of their portfolio | 62.3k $957.5k | Reduced -68.3k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 61.0k $847.3k | Added +25.4k |
| Raiffeisen Bank International AG 0.01% of their portfolio | 60.0k $919.5k | Added +5.0k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 59.0k $906.5k | Reduced -28.7k |
| Invesco Ltd. 0.00% of their portfolio | 58.0k $890.9k | Added +11.1k |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P 0.66% of their portfolio | 56.0k $860.2k | Added +16.5k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 55.2k $848.2k | Added +2.6k |
| Rafferty Asset Management, LLC 0.00% of their portfolio | 53.6k $823.4k | Reduced -22.1k |
| Tidal Investments LLC 0.00% of their portfolio | 51.5k $791.4k | Added +333 |
| Tema ETFs LLC 0.03% of their portfolio | 51.5k $791.4k | First filing |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 50.9k $782.3k | Added +13.9k |
| DekaBank Deutsche Girozentrale 0.00% of their portfolio | 49.5k $643.0k | Unchanged |
| LOS ANGELES CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 48.8k $749.2k | Added +40.3k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 48.7k $748.4k | Added +23.8k |
| HighVista Strategies LLC 0.17% of their portfolio | 48.4k $743.1k | Reduced -1.0k |
| GSA CAPITAL PARTNERS LLP 0.05% of their portfolio | 48.1k $739.0k | Reduced -2.2k |
| AXQ CAPITAL, LP 0.08% of their portfolio | 47.5k $729.7k | Added +24.8k |
| AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio | 46.5k $713.9k | Added +16.3k |
| Engineers Gate Manager LP 0.01% of their portfolio | 45.3k $696.0k | Reduced -6.5k |
| Creative Planning 0.00% of their portfolio | 44.2k $679.4k | Added +9.0k |
| HSBC HOLDINGS PLC 0.00% of their portfolio | 44.1k $686.2k | Reduced -7.2k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 43.3k $664.8k | Added +6.7k |
| Jain Global LLC 0.01% of their portfolio | 41.4k $636.3k | Added +20.0k |
| Verdad Advisers, LP 0.59% of their portfolio | 40.4k $620.3k | New |
| Schonfeld Strategic Advisors LLC 0.00% of their portfolio | 40.2k $616.9k | Added +27.8k |
| TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY 0.00% of their portfolio | 38.9k $597.0k | Unchanged |
| Jackson Creek Investment Advisors LLC 0.17% of their portfolio | 34.7k $527.0k | New |
| MARSHALL WACE, LLP 0.00% of their portfolio | 32.7k $502.8k | New |
| Legal & General Group Plc 0.00% of their portfolio | 31.0k $476.1k | Reduced -2.4k |
| MARTINGALE ASSET MANAGEMENT L P 0.01% of their portfolio | 31.0k $475.8k | Reduced -7.0k |
| FNY Investment Advisers, LLC 0.17% of their portfolio | 30.9k $473.0k | Added +140 |
| Hudson Bay Capital Management LP 0.00% of their portfolio | 30.0k $460.8k | Reduced -80.0k |
| SG Americas Securities, LLC 0.00% of their portfolio | 29.3k $450.0k | Reduced -2.3k |
| CenterBook Partners LP 0.02% of their portfolio | 28.5k $437.8k | New |
| TUDOR INVESTMENT CORP ET AL 0.00% of their portfolio | 28.1k $431.2k | Reduced -1.6k |