$JUNS

$2.86 -$0.12 (4.03%) Close

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

Ownership

13F as of Q2 2026 · 770.1K shares outstanding

Who owns JUNS?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 198.2%

Vestor Capital, LLC 0.3% · Jane Street Group, LLC 69.3%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

+3 vs last qtr

Net shares bought

−650.7K

by institutions in Q2 2026

New / sold out

6 / 3

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Jane Street Group, LLC NEW +533.4K
Virtu Financial LLC +217.7K

Biggest sellers in Q2 2026

Vestor Capital, LLC −968.8K
Vanguard Capital Management LLC −231.9K

Who is planning to sell?

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

Is your stake being diluted?

Diluted share count, FY2023–FY2025

+31.1%

+14.52% a year

Each share's claim on the business

−23.7%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $5.46M

over 3 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 years0% Under 1 year100%

Quarterly turnover

61.4%

of institutional shares changed hands

Top 10 managers, median time held

1 quarter

Super Investors

Investment managers reporting JUNS on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
VC Vestor Capital, LLC	2.2K	0.28%	−968.8K (−99.8%)	Q3 '25	0.0%
Shares held by quarter Peak holding971.0K (Q3'25) Change over 8 quarters+2.2K Share of the company0.280% Vestor Capital, LLC's full portfolio →
JS Jane Street Group, LLC	533.4K	69.26%	NEW	Q2 '26	0.0%
Shares held by quarter Peak holding533.4K (Q2'26) Change over 8 quarters+533.4K Share of the company69.260% Jane Street Group, LLC's full portfolio →

Vestor Capital, LLC

2.2K

% of company

0.28%

Change vs last qtr

−968.8K (−99.8%)

Held since

Q3 '25

Jane Street Group, LLC

533.4K

% of company

69.26%

Change vs last qtr

NEW

Held since

Q2 '26

14 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting JUNS on Form N-PORT; together they hold 49.0% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VI Vanguard Institutional Total Stock Market Index Fund Vanguard Institutional Index Funds	$74.8K	198.8K	25.81%	0.00%	March 31, 2026
VE Vanguard Extended Market Index Fund Vanguard Index Funds	$27.4K	128.0K	16.63%	0.00%	June 30, 2026

Vanguard Institutional Total Stock Market Index Fund

Vanguard Institutional Index Funds

Position value

$74.8K

% of company

25.81%

% of the fund

0.00%

As of

March 31, 2026

Vanguard Extended Market Index Fund

Vanguard Index Funds

Position value

$27.4K

% of company

16.63%

% of the fund

0.00%

As of

June 30, 2026

6 more funds behind a free account

See every fund holding Jupiter Neurosciences 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
RC Rosen Christer Insider	235.7K	30.61%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company30.610% Rosen Christer's insider activity →
HM Hayward Marshall A. Insider	63.7K	8.28%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company8.280% Hayward Marshall A.'s insider activity →

Rosen Christer

Insider

235.7K

% of company

30.61%

Change vs last qtr

—

Held since

—

Hayward Marshall A.

Insider

63.7K

% of company

8.28%

Change vs last qtr

—

Held since

—

7 more holders behind a free account

See every insider and 5%+ holder of Jupiter Neurosciences Inc.

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