---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-017223"
form_type: "8-K"
ticker: "KPTI"
cik: "0001503802"
company_name: "Karyopharm Therapeutics Inc."
filed_at: "2025-01-30T23:59:59+00:00"
generated_at: "2026-05-27T05:15:42.160246+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Karyopharm shareholders approve reverse stock split and share increase

## Summary
- Approved increase in authorized capital stock to 805M shares (common to 800M).
- Approved reverse stock split at ratio 1:5 to 1:15; board to decide timing and exact ratio by Feb 28, 2025.
- Reverse split: 74.8M votes for, 20.0M against; share increase: 71.6M for, 23.4M against.

## SEC filing metadata
- accession: 0001193125-25-017223
- form_type: 8-K
- ticker: KPTI
- cik: 0001503802
- company_name: Karyopharm Therapeutics Inc.
- filed_at: 2025-01-30T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.07
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1503802/000119312525017223/0001193125-25-017223-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1503802/000119312525017223/d893335d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-017223
- JSON: https://secwatch.observer/filing/0001193125-25-017223.json
- Plain text: https://secwatch.observer/filing/0001193125-25-017223.txt

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