Company · Ownership research

Septerna, Inc. SEPN

CIK 0001984086

Form 4 transactions dated Nov 1, 2023 to Nov 7, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through Oct 19, 2026.

Some filings are submitted jointly by several insiders. The SEC form does not apportion the reported figures between them, so results include every joint filer.

Insider purchases & sales

Purchased: $93.97M
Sold: $76.20M

Nov 1, 2023 – Oct 19, 2026
Available records · partial months are marked ·

20243 of 3 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Oct 28, 2024	RA Capital Healthcare Fund LP · RA CAPITAL MANAGEMENT, L.P. · Kolchinsky Peter · Shah Rajeev M. · RA Capital Nexus Fund III, L.P. Director · 10% owner	Purchase	$75.06M 4,170,000 shares bought	Unavailable Indirect holding	▾
Oct 28, 2024	Third Rock Ventures V, L.P. · Third Rock Ventures VI, L.P. · Third Rock Ventures GP V, LP · Third Rock Ventures GP VI, L.P. · TRV GP VI, LLC · TRV GP V, LLC 10% owner	Purchase	$6.67M 370,500 shares bought	Unavailable Direct holding	▾
Oct 28, 2024	Third Rock Ventures V, L.P. · Third Rock Ventures VI, L.P. · Third Rock Ventures GP V, LP · Third Rock Ventures GP VI, L.P. · TRV GP VI, LLC · TRV GP V, LLC 10% owner	Purchase	$5.03M 279,500 shares bought	Unavailable Indirect holding	▾

Showing 3 / 3 record groups in 2024. The complete set is available through the API.

Septerna, Inc. · SEPN

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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 3 of 3 purchase / sale groups and 7 of 7 other groups; the totals and the monthly series cover the whole window.

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{"action":"list","ticker":"SEPN","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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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. Share totals are on today's split-adjusted basis. 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.