Eton Pharmaceuticals, Inc. (ETON) Insider Trading

Over the last 3 months, ETON insiders made 0 open-market buys and 7 sales, a net sale of -$7.1M (SEC Form 4). Over the last 6 months, 70 institutions increased and 68 reduced their position (13F).

Insider Activity

Sentiment
0/100
Buys (3m)
0
Sells (3m)
7
Net (3m)
-$7.1M
Insider trades by month Buys Sells
Sep
Sep
Oct
Jun
Aug
May
Context3-month price +67.6%Institutions mixed (13F)
DateInsiderTypeSharesPrice
May 29, 2026BRYNJELSEN SEANdirector, officer: President & CEOSell148$32.67
May 29, 2026BRYNJELSEN SEANdirector, officer: President & CEOSell119,852$31.88
May 27, 2026Krempa Davidofficer: Chief Business OfficerOption25,000$1.38
May 27, 2026Krempa Davidofficer: Chief Business OfficerOption12,524$1.37
May 27, 2026Krempa Davidofficer: Chief Business OfficerSell37,524$31.49
May 27, 2026Krempa Davidofficer: Chief Business OfficerOption30,591$3.58
May 27, 2026Krempa Davidofficer: Chief Business OfficerSell9,315$33.88
May 27, 2026Krempa Davidofficer: Chief Business OfficerOption12,476$1.37
May 27, 2026Krempa Davidofficer: Chief Business OfficerOption7,203$3.58
May 27, 2026Krempa Davidofficer: Chief Business OfficerSell19,679$31.47
May 27, 2026Krempa Davidofficer: Chief Business OfficerSell32,963$33.22
May 27, 2026Krempa Davidofficer: Chief Business OfficerSell519$35.00
Apr 22, 2026RIEDEL NORBERT GdirectorOption12,500$7.31
Apr 22, 2026RIEDEL NORBERT GdirectorOption19,655$8.61
Jan 14, 2026Krempa Davidofficer: Chief Business OfficerTax1,942$15.62
Jan 14, 2026Gruber James R.officer: Chief Financial OfficerGrant25,856—
Jan 14, 2026Gruber James R.officer: Chief Financial OfficerGrant40,655$15.47
Jan 14, 2026Gruber James R.officer: Chief Financial OfficerTax2,293$15.47
Jan 14, 2026BRYNJELSEN SEANdirector, 10 percent owner, officer: President & CEOTax5,015$15.39
Jan 14, 2026RIEDEL NORBERT GdirectorGrant12,196$15.47
Jan 14, 2026Adams Jennifer McKiedirectorGrant7,757—
Jan 14, 2026Adams Jennifer McKiedirectorGrant12,196$15.47
Jan 14, 2026CASAMENTO CHARLES JdirectorGrant7,757—
Jan 14, 2026CASAMENTO CHARLES JdirectorGrant12,196$15.47
Jan 14, 2026MAIER PAUL VdirectorGrant7,757—
Jan 14, 2026MAIER PAUL VdirectorGrant12,196$15.47
Jan 14, 2026Erdogan-Trinkaus Ipekofficer: Chief Commercial OfficerGrant25,856—
Jan 14, 2026Erdogan-Trinkaus Ipekofficer: Chief Commercial OfficerGrant40,655$15.47
Jan 14, 2026BRYNJELSEN SEANdirector, 10 percent owner, officer: President & CEOGrant100,517—
Jan 14, 2026BRYNJELSEN SEANdirector, 10 percent owner, officer: President & CEOGrant158,046$15.47

Source: ETON SEC Form 4 filings, latest May 29, 2026. For informational purposes only — not investment advice.

Institutional activity (13F)

How institutions changed their ETON positions over the last 6 months (SEC Form 13F).

Increased
70
New positions
47
Reduced
68
Sold out
36
Largest moves
InstitutionActionSharesFiled
OPALEYE MANAGEMENT INC.Unchanged2.9MMay 15, 2026
OPALEYE MANAGEMENT INC.Unchanged2.9MFeb 17, 2026
ECOR1 CAPITAL, LLCIncreased2.2MMay 15, 2026
ECOR1 CAPITAL, LLCUnchanged2.0MFeb 17, 2026
BLACKROCK, INC.Increased1.7MFeb 12, 2026
BLACKROCK, INC.Reduced1.7MMay 13, 2026
VANGUARD GROUP INCIncreased1.3MJan 29, 2026
NANTAHALA CAPITAL MANAGEMENT, LLCUnchanged1.2MMay 15, 2026
NANTAHALA CAPITAL MANAGEMENT, LLCUnchanged1.2MFeb 13, 2026
VANGUARD CAPITAL MANAGEMENT LLCNew Position994KMay 15, 2026
GEODE CAPITAL MANAGEMENT, LLCIncreased578KMay 15, 2026
GEODE CAPITAL MANAGEMENT, LLCReduced565KFeb 9, 2026
STATE STREET CORPIncreased530KMay 15, 2026
STATE STREET CORPIncreased502KFeb 13, 2026
MORGAN STANLEYReduced494KFeb 13, 2026

Source: SEC Form 13F filings. For informational purposes only — not investment advice.

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