JBIO · Jade Biosciences, Inc. · Shareholders & Ownership

$15.13 +0.27 (+1.82%) At close · Oct 21

Russell 2000 member Rebalance outlook locked

Market Cap

$962.23M

63.60M

Volume · Oct 21 932.74K Avg daily vol (3M) 902.38K

Every disclosed holder of JBIO in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns JBIO

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	153	72,903,111	114.63%	Yes
Insiders (Forms 3, 4, 5)	5	540,845	0.85%	Yes
13D/G-only blocks	5	6,536,330	10.28%	Yes
Remaining	—	16,382,899	-25.76%	Negative
Registered funds (N-PORT, not summed)	141	18,781,864	29.53%	No

Shares outstanding: 63,597,387, the issuer's latest cover-page count restated onto today's split basis.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of JBIO

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	FMR LLC 13F CIK 315066 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	9,126,877	14.35%	+2,041,454	Jun 30, 2026	carried, not yet filed for the newest quarter
1.1	Fidelity Growth Company Fund Fund S000007119 · Registered fund · May 31, 2026 Fidelity Mt. Vernon Street Trust, not summed	1,009,957	1.59%	0	May 31, 2026	Fidelity Mt. Vernon Street Trust, not summed
1.2	Fidelity Stock Selector Small Cap Fund Fund S000005453 · Registered fund · Jul 31, 2026 Fidelity Capital Trust, not summed	908,146	1.43%	+214,446	Jul 31, 2026	Fidelity Capital Trust, not summed
1.3	Fidelity Small Cap Growth Fund Fund S000007193 · Registered fund · Jul 31, 2026 Fidelity Securities Fund, not summed	779,915	1.23%	+263,900	Jul 31, 2026	Fidelity Securities Fund, not summed
1.4	Fidelity Advisor Biotechnology Fund Fund S000005321 · Registered fund · Jul 31, 2026 Fidelity Advisor Series VII, not summed	698,671	1.10%	-195,672	Jul 31, 2026	Fidelity Advisor Series VII, not summed
1.5	Select Health Care Portfolio Fund S000007466 · Registered fund · May 31, 2026 Fidelity Select Portfolios, not summed	640,000	1.01%	+240,000	May 31, 2026	Fidelity Select Portfolios, not summed
2	Jupiter Topco LLC 13F CIK 2146052 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	6,273,262	9.86%	+3,167,593	Jun 30, 2026	carried, not yet filed for the newest quarter
2.1	JANUS HENDERSON GROUP PLC 13G CIK 1274173 · Investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	6,273,262	9.86%	+3,167,593	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
3	Venrock Healthcare Capital Partners III, L.P. 13G CIK 1738048 · Unknown · Jun 30, 2026 Rule 13d-1(c), passive investor	5,145,330	8.09%	+29,468	Jun 30, 2026	Rule 13d-1(c), passive investor
4	Fairmount Funds Management LLC 13F CIK 1802528 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,553,494	7.16%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
4.1	Fairmount Funds Management LLC Insider CIK 1802528 · Oct 6, 2025 Director, issuer-wide, not summed	4,553,494	7.16%	+4,461,484	Oct 6, 2025	Director, issuer-wide, not summed
5	RA CAPITAL MANAGEMENT, L.P. 13F CIK 1346824 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,671,083	5.77%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
5.1	RA CAPITAL MANAGEMENT, L.P. Insider CIK 1346824 · Apr 28, 2025 Director, issuer-wide, not summed	254	0.00%	—	Apr 28, 2025	Director, issuer-wide, not summed
6	Venrock Adviser, LLC 13F CIK 1615982 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,220,364	5.06%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
7	Paradigm Biocapital Advisors LP 13G CIK 1855655 · Registered investment adviser · Jul 10, 2026 Rule 13d-1(c), passive investor, not summed	3,106,793	4.89%	—	Jul 10, 2026	Rule 13d-1(c), passive investor, not summed
7.1	Paradigm Biocapital Advisors LP 13F CIK 1855655 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,857,405	4.49%	+2,857,405	Jun 30, 2026	carried, not yet filed for the newest quarter
8	Bellevue Group AG 13F CIK 1674546 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	3,057,996	4.81%	-443,506	Jun 30, 2026	carried, not yet filed for the newest quarter
8.1	Bellevue Group AG 13G CIK 1674546 · Non-US institution · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	3,057,996	4.81%	-283,107	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
9	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	2,801,451	4.41%	+487,502	Jun 30, 2026	carried, not yet filed for the newest quarter
9.1	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	852,070	1.34%	+52,980	Jun 30, 2026	iShares Trust, not summed
9.2	iShares Russell 2000 Growth ETF Fund S000004343 · Registered fund · Jun 30, 2026 iShares Trust, not summed	298,909	0.47%	—	Jun 30, 2026	iShares Trust, not summed
9.3	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	109,445	0.17%	+29,298	Jun 30, 2026	iShares Trust, not summed
9.4	iShares Core S&P Total U.S. Stock Market ETF Fund S000004317 · Registered fund · Jun 30, 2026 iShares Trust, not summed	70,615	0.11%	—	Jun 30, 2026	iShares Trust, not summed
9.5	Master Small Cap Index Series Fund S000002716 · Registered fund · Jun 30, 2026 Quantitative Master Series LLC, not summed	60,859	0.10%	+9,062	Jun 30, 2026	Quantitative Master Series LLC, not summed
10	FRANKLIN RESOURCES INC 13F CIK 38777 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,792,080	4.39%	+2,792,080	Jun 30, 2026	carried, not yet filed for the newest quarter
10.1	Franklin Small Cap Value Fund Fund S000007356 · Registered fund · Jul 31, 2026 Franklin Value Investors Trust, not summed	1,412,559	2.22%	—	Jul 31, 2026	Franklin Value Investors Trust, not summed
10.2	Franklin Biotechnology Discovery Fund Fund S000006882 · Registered fund · Jul 31, 2026 Franklin Strategic Series, not summed	479,949	0.75%	+342,220	Jul 31, 2026	Franklin Strategic Series, not summed
10.3	Franklin Small Cap Growth Fund Fund S000006889 · Registered fund · Jul 31, 2026 Franklin Strategic Series, not summed	432,709	0.68%	—	Jul 31, 2026	Franklin Strategic Series, not summed
10.4	Franklin Small Cap Value VIP Fund Fund S000007315 · Registered fund · Jun 30, 2026 Franklin Templeton Variable Insurance Products Trust, not summed	151,844	0.24%	—	Jun 30, 2026	Franklin Templeton Variable Insurance Products Trust, not summed
10.5	Franklin Mutual Small-Mid Cap Value Fund Fund S000007354 · Registered fund · Jul 31, 2026 Franklin Value Investors Trust, not summed	77,082	0.12%	—	Jul 31, 2026	Franklin Value Investors Trust, not summed
11	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	2,335,285	3.67%	+1,679,595	Jun 30, 2026	carried, not yet filed for the newest quarter
11.1	State Street(R) SPDR(R) S&P(R) Biotech ETF Fund S000010018 · Registered fund · Jun 30, 2026 SPDR SERIES TRUST, not summed	1,533,573	2.41%	—	Jun 30, 2026	SPDR SERIES TRUST, not summed
11.2	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	10,991	0.02%	-4,200	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
11.3	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	761	0.00%	+4	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
11.4	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	291	0.00%	—	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
12	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,244,773	3.53%	+448,121	Jun 30, 2026	carried, not yet filed for the newest quarter
13	ADAGE CAPITAL PARTNERS GP, L.L.C. 13F CIK 1165408 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,910,812	3.00%	+1,910,812	Jun 30, 2026	carried, not yet filed for the newest quarter
14	Polar Capital Holdings Plc 13F CIK 1837309 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,846,982	2.90%	+1,846,982	Jun 30, 2026	carried, not yet filed for the newest quarter
15	Avidity Partners Management LP 13F CIK 1791827 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,700,708	2.67%	+300,000	Jun 30, 2026	carried, not yet filed for the newest quarter
16	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,699,343	2.67%	+314,008	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
17	Remedium Capital Partners, LLC 13F CIK 2104501 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,577,750	2.48%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
18	Soleus Capital Management, L.P. 13F CIK 1802630 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,550,690	2.44%	+753,946	Jun 30, 2026	carried, not yet filed for the newest quarter
19	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,475,079	2.32%	+1,459,216	Jun 30, 2026	carried, not yet filed for the newest quarter
20	James N. Topper 13G CIK 1863769 · Unknown · Sep 30, 2025 Rule 13d-1(c), passive investor	1,384,646	2.18%	+43,943	Sep 30, 2025	Rule 13d-1(c), passive investor
21	BAKER BROS. ADVISORS LP 13F CIK 1263508 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,230,426	1.93%	-410,711	Jun 30, 2026	carried, not yet filed for the newest quarter
22	Logos Global Management LP 13F CIK 1792126 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,125,000	1.77%	+725,000	Jun 30, 2026	carried, not yet filed for the newest quarter
23	Versant Venture Management, LLC 13F CIK 1560009 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	991,783	1.56%	-534,037	Jun 30, 2026	carried, not yet filed for the newest quarter
24	ACORN CAPITAL ADVISORS, LLC 13F CIK 2054410 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	986,760	1.55%	+200,000	Jun 30, 2026	carried, not yet filed for the newest quarter
25	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	985,178	1.55%	+162,658	Jun 30, 2026	carried, not yet filed for the newest quarter
26	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	929,407	1.46%	+792,185	Jun 30, 2026	carried, not yet filed for the newest quarter
27	Foresite Capital Management VI LLC 13F CIK 2013341 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	886,667	1.39%	+566,667	Jun 30, 2026	carried, not yet filed for the newest quarter
28	Balyasny Asset Management L.P. 13F CIK 1218710 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	878,726	1.38%	+476,237	Jun 30, 2026	carried, not yet filed for the newest quarter
29	Affinity Asset Advisors, LLC 13F CIK 1773195 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	840,350	1.32%	+200,394	Jun 30, 2026	carried, not yet filed for the newest quarter
30	SAMSARA BIOCAPITAL, LLC 13F CIK 1744967 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	736,237	1.16%	-232,561	Jun 30, 2026	carried, not yet filed for the newest quarter
31	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	735,224	1.16%	+582,187	Jun 30, 2026	carried, not yet filed for the newest quarter
31.1	Goldman Sachs Small Cap Equity Insights Fund Fund S000009329 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	28,350	0.04%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
31.2	Goldman Sachs Small Cap Growth Insights Fund Fund S000014930 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	18,030	0.03%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
31.3	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	7,079	0.01%	+3,320	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
31.4	Goldman Sachs Variable Insurance Trust Small Cap Equity Insights Fund Fund S000009355 · Registered fund · Jun 30, 2026 Goldman Sachs Variable Insurance Trust, not summed	4,257	0.01%	—	Jun 30, 2026	Goldman Sachs Variable Insurance Trust, not summed
32	Pictet Asset Management Holding SA 13F CIK 1993888 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	733,768	1.15%	+733,768	Jun 30, 2026	carried, not yet filed for the newest quarter
33	Janus Henderson Global Life Sciences Fund Fund S000010494 · Registered fund · Jun 30, 2026 Janus Investment Fund, not summed	716,799	1.13%	—	Jun 30, 2026	Janus Investment Fund, not summed
34	JPMorgan Small Cap Growth Fund Fund S000003859 · Registered fund · Jun 30, 2026 JPMorgan Trust II, not summed	677,766	1.07%	—	Jun 30, 2026	JPMorgan Trust II, not summed
35	Aberdeen Group plc 13F CIK 1716774 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	621,108	0.98%	-246,176	Jun 30, 2026	carried, not yet filed for the newest quarter
36	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	585,761	0.92%	-359,015	Jun 30, 2026	carried, not yet filed for the newest quarter
37	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	486,955	0.77%	+448,357	Jun 30, 2026	carried, not yet filed for the newest quarter
38	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	484,964	0.76%	+118,146	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
39	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	461,528	0.73%	+250,209	Jun 30, 2026	carried, not yet filed for the newest quarter
40	Blackstone Inc. 13F CIK 1393818 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	435,320	0.68%	+435,320	Jun 30, 2026	carried, not yet filed for the newest quarter
41	Ikarian Capital, LLC 13F CIK 1778253 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	427,349	0.67%	-85,000	Jun 30, 2026	carried, not yet filed for the newest quarter
42	King Andrew James Insider CIK 1823187 · Feb 12, 2026 See Remarks, issuer-wide	386,113	0.61%	+376,260	Feb 12, 2026	See Remarks, issuer-wide
43	Walleye Capital LLC 13F CIK 1758720 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	365,272	0.57%	+365,272	Jun 30, 2026	carried, not yet filed for the newest quarter
44	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	314,548	0.49%	+154,497	Jun 30, 2026	carried, not yet filed for the newest quarter
45	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	304,867	0.48%	+85,370	Jun 30, 2026	carried, not yet filed for the newest quarter
46	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	295,081	0.46%	+53,176	Jun 30, 2026	carried, not yet filed for the newest quarter
46.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	16,411	0.03%	+1,190	Jun 30, 2026	Northern Funds, not summed
47	LORD, ABBETT & CO. LLC 13F CIK 728100 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	226,606	0.36%	+226,606	Jun 30, 2026	carried, not yet filed for the newest quarter
47.1	Lord Abbett Micro-Cap Growth Fund Fund S000007142 · Registered fund · Jul 31, 2026 LORD ABBETT SECURITIES TRUST, not summed	125,717	0.20%	—	Jul 31, 2026	LORD ABBETT SECURITIES TRUST, not summed
47.2	Lord Abbett Health Care Fund Fund S000064462 · Registered fund · Jul 31, 2026 LORD ABBETT SECURITIES TRUST, not summed	1,934	0.00%	—	Jul 31, 2026	LORD ABBETT SECURITIES TRUST, not summed
48	abrdn Life Sciences Investors Fund · Registered fund · Jun 30, 2026 abrdn Life Sciences Investors, not summed	225,693	0.35%	—	Jun 30, 2026	abrdn Life Sciences Investors, not summed
48.1	abrdn Healthcare Investors Fund · Registered fund · Jun 30, 2026 abrdn Healthcare Investors, not summed	403,515	0.63%	—	Jun 30, 2026	abrdn Healthcare Investors, not summed
49	JPMorgan Small Cap Blend Fund Fund S000002767 · Registered fund · Jun 30, 2026 JPMorgan Trust I, not summed	217,409	0.34%	—	Jun 30, 2026	JPMorgan Trust I, not summed
50	Connor, Clark & Lunn Investment Management Ltd. 13F CIK 1596800 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	217,157	0.34%	+48,106	Jun 30, 2026	carried, not yet filed for the newest quarter

30 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 225 holders

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Key facts CIK 1798749 CUSIP 008064206 13F (30d) 11 filings 11 filers Visit website Investor relations