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SEPN SCHEDULE 13G/A: SEC filing

An institutional investor

Filed with the SEC on · accession 0000938206-26-000037

SEPN filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Aug 14, 2026. A report the company filed with the SEC (the US market regulator). The stock moved -1.4% by the first close after the filing.

Summary of the filing

An institutional investor filed an amended Schedule 13G indicating a change in its passive ownership position in Septerna, Inc. The filing does not disclose a control intent or activist campaign.

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Key details

IssuerSepterna, Inc.

How SEPN stock reacted

Close before

$45.14

Aug 13, 2026

First close after

-1.42%

$44.50

5 trading days

-9.64%

$40.79

Since filing

+4.90%

$47.35

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Frequently asked questions

What did SEPN file with the SEC on Aug 14, 2026?

SEPN filed a SCHEDULE 13G/A (SEC filing). An institutional investor filed an amended Schedule 13G indicating a change in its passive ownership position in Septerna, Inc. The filing does not disclose a control intent or activist campaign.

How do I read a SCHEDULE 13G/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13G/A (schedule 13g/a): A report the company filed with the SEC (the US market regulator).

How did SEPN stock react to this filing?

SEPN closed at $45.14 before the filing and $44.50 on Aug 14, 2026 (-1.42%). Five trading days later: $40.79 (-9.64%).

Other SEPN SEC filings

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