---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-348060"
form_type: "8-K"
ticker: "CYTK"
cik: "0001061983"
company_name: "CYTOKINETICS INC"
filed_at: "2026-08-13T13:25:17+00:00"
generated_at: "2026-08-13T13:26:10.265886+00:00"
event_type: "litigation"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Cytokinetics sues BMS/MyoKardia over patent on MYQORZO (aficamten)

## Summary
- Filed complaint in U.S. District Court for Delaware against Bristol-Myers Squibb and MyoKardia over U.S. Patent No. 12,616,697.
- Seeks declaratory judgment that Cytokinetics does not infringe and that the '697 patent claims are invalid.
- Requests injunction barring defendants from threatening infringement litigation against MYQORZO (aficamten) users, customers, and distributors.
- Also seeks costs, attorneys' fees, and a jury trial; company says it will vigorously assert its rights.

## SEC filing metadata
- accession: 0001193125-26-348060
- form_type: 8-K
- ticker: CYTK
- cik: 0001061983
- company_name: CYTOKINETICS INC
- filed_at: 2026-08-13T13:25:17+00:00
- event_type: litigation
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1061983/000119312526348060/0001193125-26-348060-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1061983/000119312526348060/cytk-20260813.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-348060
- JSON: https://secwatch.observer/filing/0001193125-26-348060.json
- Plain text: https://secwatch.observer/filing/0001193125-26-348060.txt

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