$ETON

$51.16 +$0.99 (1.97%) Close

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

Ownership

13F as of Q2 2026 · 28.6M shares outstanding

Who owns ETON?

By type of holder

Institutions 69.8% Insiders 5.6% Everyone else 24.7%

Concentration Top 10 holders own 44.5%

Opaleye Management Inc. 10.0% · EcoR1 Capital, LLC 7.6%

Institutional ownership

69.8%

+7.5 pts vs last qtr

Institutional holders

162

+46 vs last qtr

Net shares bought

+2.2M

by institutions in Q2 2026

New / sold out

53 / 7

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Nuveen, LLC +317.8K
Morgan Stanley +290.0K

Biggest sellers in Q2 2026

Cannell Capital LLC −171.2K
Soleus Capital Management, L.P. SOLD OUT −166.4K

Who is planning to sell?

Notices of proposed sale, last 12 months

$31.4M

18 notices from 6 people

Shares covered

784.5K

2.74% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Gruber James R. Officer $10.9M
Brynjelsen Sean Officer $10.4M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

There are not yet two fiscal years of reported share counts for Eton Pharmaceuticals Inc.

How patient are the owners?

Institutional shares by how long they've been held

5+ years47% 3–5 years1% 1–3 years32% Under 1 year20%

Quarterly turnover

13.2%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ETON on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
OM Opaleye Management Inc.	2.9M	10.01%	Unchanged	≤2021	9.4%
Shares held by quarter Peak holding2.9M (Q2'25) Change over 8 quarters+80.0K Share of the company10.010% Opaleye Management Inc.'s full portfolio →
EC EcoR1 Capital, LLC	2.2M	7.60%	Unchanged	2024	3.8%
Shares held by quarter Peak holding2.2M (Q1'26) Change over 8 quarters+1.6M Share of the company7.600% EcoR1 Capital, LLC's full portfolio →

Opaleye Management Inc.

2.9M

% of company

10.01%

Change vs last qtr

Unchanged

Held since

≤2021

EcoR1 Capital, LLC

2.2M

% of company

7.60%

Change vs last qtr

Unchanged

Held since

2024

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting ETON on Form N-PORT; together they hold 17.2% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IR iShares Russell 2000 ETF iShares Trust	$25.1M	694.0K	2.43%	0.03%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$24.8M	684.8K	2.40%	0.00%	June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$25.1M

% of company

2.43%

% of the fund

0.03%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$24.8M

% of company

2.40%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Eton Pharmaceuticals 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
BS Brynjelsen Sean Insider	1.0M	3.54%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company3.540% Brynjelsen Sean's insider activity →
RN Riedel Norbert G Insider	224.3K	0.78%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.780% Riedel Norbert G's insider activity →

Brynjelsen Sean

Insider

1.0M

% of company

3.54%

Change vs last qtr

—

Held since

—

Riedel Norbert G

Insider

224.3K

% of company

0.78%

Change vs last qtr

—

Held since

—

5 more holders behind a free account

See every insider and 5%+ holder of Eton Pharmaceuticals Inc.

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