KPTI SCHEDULE 13G/A: SEC filing
An institutional holder
Filed with the SEC on · accession 0001636587-26-000086
KPTI filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Oct 8, 2026. An institutional holder filed an amended Schedule 13G for Karyopharm Therapeutics Inc. (KPTI), indicating a change in beneficial ownership position. The stock moved -7.0% 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 beneficial ownership position. The filing text provided does not disclose specific ownership percentages or share counts.
Key details
How KPTI stock reacted
Close before
$0.65
Oct 7, 2026
First close after
-6.98%
$0.60
5 trading days
-51.16%
$0.32
Since filing
-91.49%
$0.05
✦ Ask GOAX AI about this filing — what it means for KPTI, what changed since its last filings and what to watch next.
Try it free for 7 days🔔 Want to stay updated on new SEC filings for KPTI?
Click hereFrequently asked questions
What did KPTI file with the SEC on Oct 8, 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 beneficial ownership position. The filing text provided does not disclose specific ownership percentages or share counts.
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 $0.65 before the filing and $0.60 on Oct 8, 2026 (-6.98%). Five trading days later: $0.32 (-51.16%).
Other KPTI SEC filings
Get alerts when KPTI files with the SEC, plus live charts, key levels and news for 13,000+ stocks.
Try SEPT free for 7 days