Stocks › Biotechnology › JBIO

Jade Biosciences JBIO

US equityMarket cap rank #3331Biotechnology

$13.77 +$0.36 (+2.68%)

Pre-market · Oct 8, 9:10 am ET · After hours $13.00 -5.59%

Open$13.19

Prev close$13.41

Day range$13.08 – $14.14

Volume951.3K

Market cap$875.74M

P/E (TTM)–

Dividend yield–

Ownership & positioning

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

Institutional ownership115.5%+0.31 pts vs. prior quarter

Institutions holding189+0 vs. prior quarter

Insider trades (recent)23 buys / 6 sellsNet buying

Short interest17.27% of floatDays to cover 11.8 · as of 15 Sep 2026

Short-sale volume share15.9%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: +$1.58M (8 inflow days, 12 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 42.2% of shares outstanding.

Largest holders

FMR14.35%
Janus Henderson Group plc9.86%
Fairmount Funds Management LLC7.16%
RA Capital Management, L.P.5.77%
VR Management, LLC5.06%
Paradigm Biocapital Advisors LP4.89%
Bellevue Asset Management AG4.81%
BlackRock4.40%

By investor type

Mutual Fund63.18%
Hedge Fund32.51%
VC/PE Fund16.75%
Public Company2.35%
Private Company0.43%
Individual/Insider0.28%
Government Pension Fund0.17%
Insurance Company0.11%

Reported short interest has risen from 13.39% to 17.27% 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
Janus Henderson Group plc	Mutual Fund	2026/Q3	+3,167,593	9.9%
Franklin Resources	Mutual Fund	2026/Q3	+2,792,045	4.4%
FMR	Mutual Fund	2026/Q3	+2,041,454	14.4%
Adage Capital Management, L.P.	Hedge Fund	2026/Q3	+1,910,812	3.0%
Polar Capital Holdings Plc	Mutual Fund	2026/Q3	+1,846,982	2.9%
State Street Global Advisors	Mutual Fund	2026/Q3	+1,679,595	3.7%
J.P. Morgan Asset Management, Inc.	Mutual Fund	2026/Q3	+1,432,818	2.3%
Citadel Advisors LLC	Hedge Fund	2026/Q3	+792,185	1.5%
Soleus Capital Management, L.P.	Hedge Fund	2026/Q3	+753,946	2.4%
Pictet Asset Management Limited	Mutual Fund	2026/Q3	+733,768	1.2%
Logos Global Management, L.P.	Hedge Fund	2026/Q3	+725,000	1.8%
Foresite Capital Management, LLC	VC/PE Fund	2026/Q3	+566,667	1.4%
Vanguard Capital Management, LLC	Mutual Fund	2026/Q3	+533,491	4.0%
BlackRock	Mutual Fund	2026/Q3	+487,502	4.4%
Balyasny Asset Management L.P.	Hedge Fund	2026/Q3	+476,237	1.4%

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

Insider transactions

Date	Insider	Title	Transaction	Shares	Price	Held after
24 Jun 2026	Mark Eisner	Director	Other Derivative Acquisition	+47,675	$21.81	47,675
8 Jun 2026	Eric Dobmeier	Chairperson	Other Derivative Acquisition	+34,843	$15.22	34,843
8 Jun 2026	Christopher Cain	Director	Other Derivative Acquisition	+34,843	$15.22	34,843
8 Jun 2026	Erin Lavelle	Director	Other Derivative Acquisition	+34,843	$15.22	34,843
8 Jun 2026	Lawrence Klein	Director	Other Derivative Acquisition	+34,843	$15.22	34,843
8 Jun 2026	Peter Harwin		Other Derivative Acquisition	+34,843	$15.22	34,843
11 Feb 2026	Tom Frohlich	Chief Executive Officer	Other Acquisition	+78,750	–	78,750
11 Feb 2026	Tom Frohlich	Chief Executive Officer	Other Derivative Acquisition	+472,500	$14.81	472,500
11 Feb 2026	Bradford Dahms	Chief Financial Officer	Other Acquisition	+37,813	–	37,813
11 Feb 2026	Bradford Dahms	Chief Financial Officer	Other Derivative Acquisition	+226,875	$14.81	226,875
11 Feb 2026	Andrew King	Chief Scientific Officer & Head of R&D	Other Acquisition	+41,250	–	41,250
11 Feb 2026	Andrew King	Chief Scientific Officer & Head of R&D	Other Derivative Acquisition	+247,500	$14.81	247,500
11 Feb 2026	Elizabeth Bekiroglu		Other Acquisition	+28,125	–	28,125
11 Feb 2026	Elizabeth Bekiroglu		Other Derivative Acquisition	+168,750	$14.81	168,750
5 Oct 2025	Fairmount Funds Management LLC		Private Acquisition	+1,333,126	$9.14	4,553,494
5 Oct 2025	Fairmount Funds Management LLC		Other Derivative Acquisition	+855,047	$0.00	855,047
13 Jul 2025	Bradford Dahms	Chief Financial Officer	Other Derivative Acquisition	+526,000	$9.00	526,000
24 Jun 2025	Atlas Venture Advisors, Inc.		Intent to Sell (Form 144)	-28,977	$10.48	–
24 Jun 2025	Atlas Venture Advisors, Inc.		Intent to Sell (Form 144)	-235	$10.48	–
23 Jun 2025	Atlas Venture Advisors, Inc.		Intent to Sell (Form 144)	-16,132	$9.87	–

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	10,982,905	17.3%	11.8
31 Aug 2026	9,994,410	15.7%	16.5
14 Aug 2026	9,650,429	15.2%	10.2
31 Jul 2026	8,690,697	14.3%	11.5
15 Jul 2026	7,528,320	12.4%	7.2
30 Jun 2026	8,148,753	13.4%	4.9

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