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KPTI SCHEDULE 13G/A: SEC filing

An institutional holder

Filed with the SEC on · accession 0000919574-26-004964

KPTI filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Aug 12, 2026. An institutional holder filed an amended Schedule 13G for Karyopharm Therapeutics Inc. (KPTI), indicating a change in passive ownership position. The stock moved -3.3% by the first close after the filing.

Summary of the filing

An institutional holder filed an amended Schedule 13G for Karyopharm Therapeutics Inc. (KPTI), indicating a change in passive ownership position. The filing does not disclose a specific ownership percentage in the available text.

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Key details

IssuerKaryopharm Therapeutics Inc.
Filer/shareholderUnknown institutional holder

How KPTI stock reacted

Close before

$2.10

Aug 11, 2026

First close after

-3.33%

$2.03

5 trading days

-8.10%

$1.93

Since filing

-97.39%

$0.05

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Frequently asked questions

What did KPTI file with the SEC on Aug 12, 2026?

KPTI filed a SCHEDULE 13G/A (SEC filing). An institutional holder filed an amended Schedule 13G for Karyopharm Therapeutics Inc. (KPTI), indicating a change in passive ownership position. The filing does not disclose a specific ownership percentage in the available text.

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 KPTI stock react to this filing?

KPTI closed at $2.10 before the filing and $2.03 on Aug 12, 2026 (-3.33%). Five trading days later: $1.93 (-8.10%).

Other KPTI SEC filings

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