Ownership Summary
Karyopharm Therapeutics Inc. (NASDAQ:KPTI) appears in 1 institutional 13F filings for the quarter ending March 2026.
- These investors collectively held 599.7% of Karyopharm Therapeutics's outstanding shares in March 2026, down from 951.9% in September 2025.
- They increased total shares held in Karyopharm Therapeutics by 0.0% from the prior quarter, while the number of investors in KPTI decreased 50.0% year over year.
- Activity in KPTI broke down as 1 buyers, 0 sellers, and 0 unchanged among 1 total holders.
- The aggregate institutional position in Karyopharm Therapeutics amounted to 83.95K shares as of March 2026, up by 83.95K shares quarter on quarter, and down 4.34Mn shares year over year.
- Birchview Capital, LP holds the largest position in KPTI at 83.95K shares as of March 31, 2026, or 599.66% of shares outstanding.
- The biggest buyers of Karyopharm Therapeutics for the quarter ending March 2026 included Birchview Capital, LP (83.95K).
- Karyopharm Therapeutics's 1 largest shareholders as of March 2026 include Birchview Capital, LP (83.95K) per Business Quant data.