Karyopharm Therapeutics Inc: extends forbearance period to Nov 1, 2026

What happened Karyopharm Therapeutics Inc reported on Oct 22, 2026 that the parties to its Forbearance Agreement and Limited Waiver to Indentures, dated Sep 10, 2026, extended the Forbearance Period. The filing says that, in accordance with Section 19 of the Forbearance Agreement, the Forbearance Period was extended from 11:59 p.m., Eastern time, on Oct 22, 2026 to 11:59 p.m., Eastern time, on Nov 1, 2026. The filing references prior Form 8-Ks filed Sep 11, 2026 and Oct 14, 2026 regarding the Forbearance Agreement.

Key details

• Forbearance Agreement and Limited Waiver to Indentures dated Sep 10, 2026.
• Prior disclosures: Current Reports on Form 8-K filed Sep 11, 2026 and Oct 14, 2026.
• Forbearance Period previously extended to 11:59 p.m., Eastern time, on Oct 22, 2026.
• New extension: Forbearance Period now ends at 11:59 p.m., Eastern time, on Nov 1, 2026.

Why it may matter The filing is reported under Item 8.01 Other events and covers an extension of the Forbearance Period under the Forbearance Agreement. A filing does not show why the insider traded or why the company acted.