---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-428938"
form_type: "8-K"
ticker: "KPTI"
cik: "0001503802"
company_name: "Karyopharm Therapeutics Inc."
filed_at: "2026-10-22T20:15:23+00:00"
generated_at: "2026-10-22T20:16:08.682849+00:00"
event_type: "debt"
sentiment: "negative"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Karyopharm extends indenture forbearance period again, now to Nov 1, 2026 from Oct 22

## Summary
- Forbearance Period under the Forbearance Agreement and Limited Waiver to Indentures dated September 10, 2026 now ends 11:59 p.m. Eastern on November 1, 2026, instead of October 22, 2026.
- Extension was made under Section 19 of the Forbearance Agreement by the applicable parties; no other terms or new consideration disclosed.
- Second disclosed extension: prior 8-Ks on September 11, 2026 and October 14, 2026 covered the original agreement and the first push-out of the forbearance date.
- Signing officer: Michael Mano, Executive Vice President, Chief Legal Officer and Secretary; company based in Newton, Massachusetts; stock symbol KPTI on Nasdaq.

## SEC filing metadata
- accession: 0001193125-26-428938
- form_type: 8-K
- ticker: KPTI
- cik: 0001503802
- company_name: Karyopharm Therapeutics Inc.
- filed_at: 2026-10-22T20:15:23+00:00
- event_type: debt
- sentiment: negative
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1503802/000119312526428938/0001193125-26-428938-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1503802/000119312526428938/d172630d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-428938
- JSON: https://secwatch.observer/filing/0001193125-26-428938.json
- Plain text: https://secwatch.observer/filing/0001193125-26-428938.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.