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 ($3.9m this quarter). Holder counts are more reliable. Shares outstanding: 60.1m as of 2025-08-05, 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 ≈ $23.13. Options: 8 managers hold calls ($20.2m notional), 7 hold puts ($15.1m).
Trends to Q2 2025
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 |
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 2023 | 33 | 22 |
| Q4 2023 | 41 | 19 |
| Q1 2024 | 87 | 35 |
| Q2 2024 | 111 | 51 |
| Q3 2024 | 84 | 78 |
| Q4 2024 | 144 | 64 |
| Q1 2025 | 113 | 94 |
| Q2 2025 | 95 | 75 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2024 | $4.1m | $29.8m | 7.19 |
| Q4 2024 | $37.7m | $19.7m | 0.52 |
| Q1 2025 | $17.2m | $4.4m | 0.25 |
| Q2 2025 | $20.2m | $15.1m | 0.75 |
Biggest buyers
| Point72 Asset Management, L.P. | Added | +1.8m |
| ROYAL BANK OF CANADA | Added | +665.7k |
| BlackRock, Inc. | Added | +529.9k |
| CITADEL ADVISORS LLC | Added | +524.5k |
| ORBIMED ADVISORS LLC | Added | +451.7k |
| READYSTATE ASSET MANAGEMENT LP | Added | +419.4k |
| Caption Management, LLC | Added | +412.6k |
| PRICE T ROWE ASSOCIATES INC /MD/ | Added | +400.6k |
| Prosight Management, LP | Added | +164.0k |
| Jump Financial, LLC | Added | +134.4k |
Biggest sellers
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Reduced | -1.1m |
| PERCEPTIVE ADVISORS LLC | Reduced | -677.7k |
| LORD, ABBETT & CO. LLC | Sold out | -667.9k |
| Logos Global Management LP | Reduced | -650.0k |
| First Light Asset Management, LLC | Reduced | -509.2k |
| Cormorant Asset Management, LP | Reduced | -500.0k |
| Paradigm Biocapital Advisors LP | Reduced | -409.7k |
| Ensign Peak Advisors, Inc | Reduced | -285.4k |
| Avidity Partners Management LP | Sold out | -258.0k |
| STEMPOINT CAPITAL LP | Reduced | -252.1k |
Biggest calls
| Logos Global Management LP | New | $11.6m500.0k shares |
| ADAR1 Capital Management, LLC | Unchanged | $6.1m264.9k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $1.5m62.8k shares |
| CITIGROUP INC | Added | $693.0k30.0k shares |
| JANE STREET GROUP, LLC | Reduced | $249.5k10.8k shares |
| SIMPLEX TRADING, LLC | Added | $78.0k3.4k shares |
| GROUP ONE TRADING LLC | Reduced | $46.2k2.0k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| Caption Management, LLC | Added | $11.6m500.7k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $2.4m102.3k shares |
| CITIGROUP INC | Added | $693.0k30.0k shares |
| CITADEL ADVISORS LLC | Added | $425.0k18.4k shares |
| SIMPLEX TRADING, LLC | Reduced | $55.0k2.4k shares |
| Walleye Capital LLC | New | $13.9k600 shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 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 in Q2 2025
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 |
|---|---|---|---|---|---|
| Q3 2023 | 1 | $6.2m | 0 | — | — |
| Q4 2023 | 2 | $5.0m | 0 | — | — |
| Q1 2024 | 0 | — | 0 | — | — |
| Q2 2024 | 0 | — | 2 | $82.1m | — |
| Q3 2024 | 0 | — | 3 | $3.7m | $1.4m |
| 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 |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-05-01 | Meyer Andrew Hollman Chief Business Officer | Sold plan | $106.7k3.3k shares |
| 2025-04-21 | Meyer Andrew Hollman Chief Business Officer | Sold plan | $100.0k3.3k 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 2025
| Manager | Shares | Change |
|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. 4.35% of their portfolio | 11.2m $258.5m | Unchanged |
| FMR LLC 0.01% of their portfolio | 8.9m $205.3m | Added +4.7k |
| JANUS HENDERSON GROUP PLC 0.05% of their portfolio | 4.5m $103.0m | Reduced -137.8k |
| BlackRock, Inc. 0.00% of their portfolio | 3.4m $78.6m | Added +529.9k |
| Paradigm Biocapital Advisors LP 2.88% of their portfolio | 2.9m $67.5m | Reduced -409.7k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.10% of their portfolio | 2.5m $58.3m | Reduced -1.1m |
| VANGUARD GROUP INC 0.00% of their portfolio | 2.2m $50.6m | Reduced -89.2k |
| Point72 Asset Management, L.P. 0.12% of their portfolio | 2.1m $49.5m | Added +1.8m |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 1.8m $41.4m | Added +400.6k |
| Cormorant Asset Management, LP 2.58% of their portfolio | 1.5m $34.6m | Reduced -500.0k |
| EcoR1 Capital, LLC 2.01% of their portfolio | 1.5m $34.0m | Unchanged |
| STATE STREET CORP 0.00% of their portfolio | 1.4m $32.1m | Added +16.6k |
| Woodline Partners LP 0.15% of their portfolio | 1.2m $28.7m | Reduced -215.2k |
| CITADEL ADVISORS LLC 0.02% of their portfolio | 1.2m $28.4m | Added +524.5k |
| ORBIMED ADVISORS LLC 0.70% of their portfolio | 1.2m $28.0m | Added +451.7k |
| FRANKLIN RESOURCES INC 0.01% of their portfolio | 1.1m $24.7m | Reduced -117.3k |
| Logos Global Management LP 3.09% of their portfolio | 1.0m $23.1m | Reduced -650.0k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 902.3k $20.8m | Added +121.4k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 859.4k $19.9m | Added +110.1k |
| Prosight Management, LP 4.81% of their portfolio | 853.9k $19.7m | Added +164.0k |
| READYSTATE ASSET MANAGEMENT LP 0.67% of their portfolio | 696.0k $16.1m | Added +419.4k |
| Pictet Asset Management Holding SA 0.02% of their portfolio | 671.5k $15.5m | Added +14.9k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 667.5k $15.4m | Added +665.7k |
| MPM BIOIMPACT LLC 2.46% of their portfolio | 614.3k $14.2m | Added +47.1k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 492.4k $11.4m | Added +98.9k |
| Caption Management, LLC 0.97% of their portfolio | 457.0k $10.6m | Added +412.6k |
| First Turn Management, LLC 1.93% of their portfolio | 447.4k $10.3m | Added +17.3k |
| Nationale-Nederlanden Powszechne Towarzystwo Emerytalne S.A. 1.03% of their portfolio | 376.5k $8.7m | Unchanged |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 348.5k $8.1m | Added +62.2k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 341.8k $7.9m | Added +42.6k |
| MORGAN STANLEY 0.00% of their portfolio | 315.7k $7.3m | Added +33.3k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 299.4k $6.9m | Added +25.7k |
| PERCEPTIVE ADVISORS LLC 0.25% of their portfolio | 292.7k $6.8m | Reduced -677.7k |
| UBS Group AG 0.00% of their portfolio | 292.5k $6.8m | Reduced -195.9k |
| Aberdeen Group plc 0.01% of their portfolio | 285.3k $6.6m | Added +60.5k |
| Alyeska Investment Group, L.P. 0.02% of their portfolio | 258.7k $6.0m | Reduced -150.0k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 255.6k $5.9m | Reduced -5.7k |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 247.9k $5.7m | Reduced -55.3k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 247.4k $5.7m | Added +112.1k |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.00% of their portfolio | 246.9k $5.7m | Added +54.5k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 230.0k $5.3m | Reduced -138.9k |
| Jump Financial, LLC 0.06% of their portfolio | 228.4k $5.3m | Added +134.4k |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 214.4k $5.0m | Added +132.1k |
| Rock Springs Capital Management LP 0.30% of their portfolio | 210.3k $4.9m | Added +5.8k |
| TANG CAPITAL MANAGEMENT LLC 0.23% of their portfolio | 200.0k $4.6m | Added +50.0k |
| Squarepoint Ops LLC 0.01% of their portfolio | 189.6k $4.4m | Added +132.1k |
| VICTORY CAPITAL MANAGEMENT INC 0.00% of their portfolio | 182.1k $4.2m | Reduced -83.6k |
| Skandinaviska Enskilda Banken AB (publ) 0.02% of their portfolio | 177.8k $4.1m | Unchanged |
| First Light Asset Management, LLC 0.45% of their portfolio | 149.6k $3.5m | Reduced -509.2k |
| Cubist Systematic Strategies, LLC 0.04% of their portfolio | 141.8k $3.3m | Added +65.9k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 138.7k $3.2m | Added +121.7k |
| BARCLAYS PLC 0.00% of their portfolio | 132.3k $3.1m | Added +64.6k |
| Ikarian Capital, LLC 0.99% of their portfolio | 129.7k $3.0m | Unchanged |
| Bank of New York Mellon Corp 0.00% of their portfolio | 114.7k $2.6m | Added +25.3k |
| TUDOR INVESTMENT CORP ET AL 0.02% of their portfolio | 113.7k $2.6m | Reduced -60.6k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 111.4k $2.6m | Reduced -75.0k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 104.4k $2.4m | New |
| LAZARD ASSET MANAGEMENT LLC 0.00% of their portfolio | 99.9k $2.3m | Added +39.3k |
| Trexquant Investment LP 0.03% of their portfolio | 96.2k $2.2m | Reduced -72.8k |
| Nuveen, LLC 0.00% of their portfolio | 96.0k $2.2m | Reduced -27.7k |
| ALGERT GLOBAL LLC 0.04% of their portfolio | 92.5k $2.1m | Added +51.8k |
| STEMPOINT CAPITAL LP 0.67% of their portfolio | 89.9k $2.1m | Reduced -252.1k |
| SPHERA FUNDS MANAGEMENT LTD. 0.52% of their portfolio | 85.8k $2.0m | Reduced -40.0k |
| TWINBEECH CAPITAL LP 0.04% of their portfolio | 81.9k $1.9m | Added +4.4k |
| Swiss National Bank 0.00% of their portfolio | 79.1k $1.8m | Unchanged |
| MACQUARIE GROUP LTD 0.00% of their portfolio | 76.6k $1.8m | Unchanged |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 74.7k $1.7m | Added +6.0k |
| ExodusPoint Capital Management, LP 0.02% of their portfolio | 74.7k $1.7m | Added +46.8k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio | 70.3k $1.6m | Added +19.3k |
| TD Asset Management Inc 0.00% of their portfolio | 65.2k $1.5m | Reduced -400 |
| HighVista Strategies LLC 0.53% of their portfolio | 62.4k $1.4m | Reduced -12.1k |
| ADAR1 Capital Management, LLC 0.23% of their portfolio | 62.1k $1.4m | Reduced -91.7k |
| Quinn Opportunity Partners LLC 0.12% of their portfolio | 59.9k $1.4m | Added +8.0k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 59.4k $1.4m | Added +16.7k |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 55.5k $1.3m | Reduced -98.3k |
| Rhenman & Partners Asset Management AB 0.16% of their portfolio | 55.1k $1.3m | Reduced -86.5k |
| Walleye Capital LLC 0.01% of their portfolio | 53.5k $1.2m | Added +42.1k |
| NEOS Investment Management LLC 0.01% of their portfolio | 50.1k $1.2m | Added +4.1k |
| Tema ETFs LLC 0.31% of their portfolio | 50.1k $1.2m | Added +4.1k |
| Atle Fund Management AB 0.49% of their portfolio | 49.8k $1.2m | Added +3.0k |
| DekaBank Deutsche Girozentrale 0.00% of their portfolio | 49.5k $2.0m | Unchanged |
| FARALLON CAPITAL MANAGEMENT, L.L.C. 0.01% of their portfolio | 48.0k $1.1m | Unchanged |
| Legal & General Group Plc 0.00% of their portfolio | 47.4k $1.1m | Added +5.1k |
| Rafferty Asset Management, LLC 0.00% of their portfolio | 46.9k $1.1m | Reduced -9.3k |
| DARK FOREST CAPITAL MANAGEMENT LP 0.04% of their portfolio | 46.9k $1.1m | Added +2.2k |
| GILDER GAGNON HOWE & CO LLC 0.01% of their portfolio | 45.4k $1.0m | Reduced -4.7k |
| AVALON VENTURES MANAGEMENT, LLC 5.26% of their portfolio | 43.3k $1.0m | New |
| Aquatic Capital Management LLC 0.02% of their portfolio | 43.0k $993.9k | Reduced -19.4k |
| Engineers Gate Manager LP 0.01% of their portfolio | 39.7k $918.2k | Added +21.3k |
| BOOTHBAY FUND MANAGEMENT, LLC 0.03% of their portfolio | 39.5k $911.4k | Reduced -5.2k |
| ZACKS INVESTMENT MANAGEMENT 0.01% of their portfolio | 38.0k $877.1k | Reduced -154 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 37.1k $857.9k | Added +404 |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 35.6k $822.1k | Reduced -23.8k |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 33.8k $781.1k | New |
| CITIGROUP INC 0.00% of their portfolio | 33.7k $778.2k | Reduced -42.6k |
| CAPITAL FUND MANAGEMENT S.A. 0.01% of their portfolio | 32.8k $757.0k | New |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 30.0k $693.4k | Reduced -69.7k |
| Hudson Bay Capital Management LP 0.00% of their portfolio | 30.0k $693.0k | Reduced -80.0k |
| Tejara Capital Ltd 0.32% of their portfolio | 29.8k $688.4k | New |
| Erste Asset Management GmbH 0.01% of their portfolio | 27.0k $625.0k | Unchanged |