Company · Ownership research

Eton Pharmaceuticals, Inc. ETON

CIK 0001710340

Form 4 transactions dated Sep 1, 2023 to Sep 25, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 55 rows; the complete set is available through the API.

Insider filings on file run through 2026-08-28.

Insider purchases & sales

Purchased: $1.14M
Sold: $29.95M

Sep 1, 2023 – Aug 28, 2026
Available records · partial months are marked ·

202610 of 16 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
2026-08-28	MAIER PAUL V Director	Sale	$2.95M 50,000 shares sold	Unavailable Direct holding	▾
2026-08-24	Krempa David Chief Business Officer	Sale	$1.63M 25,000 shares sold	40.31% sold Direct holding	▾
2026-08-20	BRYNJELSEN SEAN President & CEO · Director	Sale	$5.53M 91,022 shares sold	8.65% sold Direct holding	▾
2026-08-19	BRYNJELSEN SEAN President & CEO · Director	Sale	$562.47K 8,978 shares sold	0.85% sold Direct holding	▾
2026-07-14	Opaleye Management Inc. 10% owner	Sale	$563.15K 15,000 shares sold	0.56% sold Indirect holding	▾
2026-07-14	Opaleye Management Inc. 10% owner	Sale	$499.89K 13,315 shares sold	24.97% sold Indirect holding	▾
2026-07-07	Opaleye Management Inc. 10% owner	Sale	$767.46K 20,000 shares sold	0.74% sold Indirect holding	▾
2026-07-07	Opaleye Management Inc. 10% owner	Sale	$256.52K 6,685 shares sold	11.14% sold Indirect holding	▾
2026-07-06	Opaleye Management Inc. 10% owner	Sale	$380.00K 10,000 shares sold	0.37% sold Indirect holding	▾
2026-07-02	Opaleye Management Inc. 10% owner	Sale	$2.43M 65,000 shares sold	2.34% sold Indirect holding	▾

Showing 16 / 16 record groups in 2026. The complete set is available through the API.

Eton Pharmaceuticals, Inc. · ETON

Follow the people behind the trades.

Sign in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and reach other datasets through the Akkru API.

Download CSV
Earlier filings
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 16 of 16 purchase / sale groups and 30 of 55 other groups; the totals and the monthly series cover the whole window.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP.

MCP  https://api.akkrudata.ai/mcp

list_insider_transactions
{"ticker":"ETON","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.