$JBIO

$14.74 +$0.24 (1.66%) Close

$JBIO Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 63.6M shares outstanding

Who owns JBIO?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 113.7%

Peter Evan Harwin 22.1% · Tomas Kiselak 22.1%

Institutional ownership

100.0%

+19.4 pts vs last qtr

Institutional holders

152

+32 vs last qtr

Net shares bought

+21.6M

by institutions in Q2 2026

New / sold out

51 / 19

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Jupiter Topco LLC NEW +6.3M
Paradigm Biocapital Advisors LP NEW +2.9M

Biggest sellers in Q2 2026

Janus Henderson Group PLC SOLD OUT −3.1M
Avidity Partners Management LP −1.1M

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Jade Biosciences, Inc. in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2021–FY2025

+155.1%

+26.38% a year

Each share's claim on the business

−60.8%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $50.7M

over 5 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years56% Under 1 year44%

Quarterly turnover

40.1%

of institutional shares changed hands

Top 10 managers, median time held

1 year

Super Investors

Investment managers reporting JBIO on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
F FMR LLC	9.1M	14.35%	+2.0M (+28.8%)	2025	0.0%
Shares held by quarter Peak holding9.1M (Q2'26) Change over 8 quarters+9.1M Share of the company14.350% FMR LLC's full portfolio →
JT Jupiter Topco LLC	6.3M	9.86%	NEW	Q2 '26	0.1%
Shares held by quarter Peak holding6.3M (Q2'26) Change over 8 quarters+6.3M Share of the company9.860% Jupiter Topco LLC's full portfolio →

FMR LLC

9.1M

% of company

14.35%

Change vs last qtr

+2.0M (+28.8%)

Held since

2025

Jupiter Topco LLC

6.3M

% of company

9.86%

Change vs last qtr

NEW

Held since

Q2 '26

28 more super investors behind a free account

See every manager holding Jade Biosciences, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting JBIO on Form N-PORT; together they hold 31.6% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$37.8M	1.7M	2.67%	0.00%	June 30, 2026
SS State Street(R) SPDR(R) S&P(R) Biotech ETF SPDR Series Trust	$34.1M	1.5M	2.41%	0.32%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$37.8M

% of company

2.67%

% of the fund

0.00%

As of

June 30, 2026

State Street(R) SPDR(R) S&P(R) Biotech ETF

SPDR Series Trust

Position value

$34.1M

% of company

2.41%

% of the fund

0.32%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Jade Biosciences, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
PE Peter Evan Harwin 5%+ holder 13D · 20.0%	14.1M	22.12%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company22.120% Disclosed stake13D · 20.0% View the 13D/G filing →
TK Tomas Kiselak 5%+ holder 13D · 20.0%	14.1M	22.11%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company22.110% Disclosed stake13D · 20.0% View the 13D/G filing →

Peter Evan Harwin

5%+ holder13D · 20.0%

14.1M

% of company

22.12%

Change vs last qtr

—

Held since

—

Tomas Kiselak

5%+ holder13D · 20.0%

14.1M

% of company

22.11%

Change vs last qtr

—

Held since

—

11 more holders behind a free account

See every insider and 5%+ holder of Jade Biosciences, Inc..

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