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Janux Therapeutics JANX

US equityMarket cap rank #3178Biotechnology

$17.92 +$1.13 (+6.73%)

Pre-market · Oct 8, 8:20 am ET · After hours $18.50 +3.24%

Open$16.52

Prev close$16.79

Day range$16.42 – $18.37

Volume1.21M

Market cap$1.10B

P/E (TTM)–

Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership101.8%-0.10 pts vs. prior quarter

Institutions holding253-2 vs. prior quarter

Insider trades (recent)38 buys / 12 sellsNet buying

Short interest9.64% of floatDays to cover 5.9 · as of 15 Sep 2026

Short-sale volume share16.6%5-day average of daily volume

Short-sale volume as % of daily volume

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$518.0K (10 inflow days, 10 outflow days).

Net flow by order size, last 20 sessions

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 44.4% of shares outstanding.

Largest holders

RA Capital Management, L.P.18.30%
BlackRock10.03%
Prosight Management, LP6.22%
State Street Global Advisors4.92%
Klaus Dorner4.91%
FMR3.93%
Federated Hermes, Inc.3.85%
Vanguard Capital Management, LLC3.55%

By investor type

Mutual Fund44.11%
Hedge Fund27.49%
VC/PE Fund22.09%
Individual/Insider5.92%
Public Company4.49%
Private Company2.17%
Insurance Company1.16%
Government Pension Fund0.30%

Reported short interest has fallen from 11.66% to 9.64% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

Holder	Type	Period	Share change	New stake
Nuveen Asset Management LLC	Insurance Company	2026/Q3	+573,337	0.9%
Federated Hermes, Inc.	Mutual Fund	2026/Q3	+2,298,727	3.8%
Two Sigma Investments, LP	Hedge Fund	2026/Q3	+1,091,151	2.0%
D. E. Shaw & Co., L.P.	Hedge Fund	2026/Q3	+998,114	1.8%
Citadel Advisors LLC	Hedge Fund	2026/Q3	+848,560	2.0%
Point72 Asset Management, L.P.	Hedge Fund	2026/Q3	+837,697	3.3%
BlackRock	Mutual Fund	2026/Q3	+701,434	10.0%
Algert Global LLC	Hedge Fund	2026/Q3	+667,492	1.8%
State Street Global Advisors	Mutual Fund	2026/Q3	+540,882	4.9%
Qube Research & Technologies Ltd	Mutual Fund	2026/Q3	+504,912	1.1%
The Goldman Sachs Group, Inc.	Public Company	2026/Q3	+331,940	1.4%
PanAgora Asset Management, Inc.	Mutual Fund	2026/Q3	+269,113	0.4%
Dimensional Fund Advisors	Mutual Fund	2026/Q3	+263,095	0.6%
Prosight Management, LP	Hedge Fund	2026/Q3	+254,481	6.2%
GuideStone Capital Management, LLC	Mutual Fund	2026/Q3	+153,823	0.3%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

Date	Insider	Title	Transaction	Shares	Price	Held after
30 Jul 2026	David Campbell	Chief Executive Officer	Other Disposition	-123,840	–	107,392
7 Jul 2026	David Campbell	Chief Executive Officer	Derivative Exercise and Retained	+7,000	$4.21	231,232
10 Jun 2026	Vickie Capps	Independent Director	Other Acquisition	+5,500	–	5,500
10 Jun 2026	Vickie Capps	Independent Director	Other Derivative Acquisition	+15,500	$13.66	15,500
10 Jun 2026	Ronald Barrett	Director	Other Acquisition	+5,500	–	5,500
10 Jun 2026	Ronald Barrett	Director	Other Derivative Acquisition	+15,500	$13.66	15,500
10 Jun 2026	Eric Dobmeier	Director	Other Acquisition	+5,500	–	7,444
10 Jun 2026	Eric Dobmeier	Director	Other Derivative Acquisition	+15,500	$13.66	15,500
10 Jun 2026	Natasha Hernday	Director	Other Acquisition	+5,500	–	7,444
10 Jun 2026	Natasha Hernday	Director	Other Derivative Acquisition	+15,500	$13.66	15,500
10 Jun 2026	Winston Kung	Independent Director	Other Acquisition	+5,500	–	5,500
10 Jun 2026	Winston Kung	Independent Director	Other Derivative Acquisition	+15,500	$13.66	15,500
10 Jun 2026	Jake Simson	Independent Director	Other Acquisition	+5,500	–	5,500
10 Jun 2026	Jake Simson	Independent Director	Other Derivative Acquisition	+15,500	$13.66	15,500
1 Jun 2026	Janeen Doyle	Chief Corporate & Business Development Officer	Open Market Disposition	-4,059	$14.03	36,000
10 May 2026	Maria Dobek	Principal Accounting Officer & VP of Accounting	Open Market Disposition	-2,038	$14.17	2,835
1 Feb 2026	William Go	Chief Medical Officer	Other Acquisition	+44,000	–	44,000
1 Feb 2026	William Go	Chief Medical Officer	Other Derivative Acquisition	+154,000	$13.99	154,000
1 Jan 2026	David Campbell	Chief Executive Officer	Other Acquisition	+96,600	–	157,350
1 Jan 2026	David Campbell	Chief Executive Officer	Open Market Disposition	-8,072	$13.73	224,232

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report date	Shares short	% of float	Days to cover
15 Sep 2026	5,891,965	9.6%	5.9
31 Aug 2026	6,063,535	9.9%	7.8
14 Aug 2026	6,626,696	10.8%	10.9
31 Jul 2026	5,922,899	9.7%	7.7
15 Jul 2026	6,454,019	10.6%	6.4
30 Jun 2026	7,108,085	11.7%	3.6

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