---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-23-009291"
form_type: "8-K"
ticker: "ESPR"
cik: "0001434868"
company_name: "Esperion Therapeutics, Inc."
filed_at: "2023-03-27T23:59:59+00:00"
generated_at: "2026-06-17T14:43:40.526369+00:00"
event_type: "litigation"
sentiment: "negative"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Esperion sues Daiichi Sankyo Europe over $300M milestone; CLEAR Outcomes showed 27% MI reduction

## Summary
- Complaint seeks declaratory judgment that $300M milestone is triggered by CLEAR Outcomes' 27% nonfatal MI risk reduction.
- DSE argues milestone only for MACE-4 composite risk reduction ≥15%; actual MACE-4 was 12.98%.
- Esperion stock fell 63% from $3.99 to $1.49 after March 15 disclosure of dispute.
- CLEAR Outcomes also showed 23% fatal+nonfatal MI and 15% stroke reduction; milestone tiers are $200M (≥15%) and $300M (≥20%).
- Esperion alleges ongoing harm and difficulty raising capital due to DSE's position.

## SEC filing metadata
- accession: 0001628280-23-009291
- form_type: 8-K
- ticker: ESPR
- cik: 0001434868
- company_name: Esperion Therapeutics, Inc.
- filed_at: 2023-03-27T23:59:59+00:00
- event_type: litigation
- sentiment: negative
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1434868/000162828023009291/0001628280-23-009291-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1434868/000162828023009291/espr-20230327.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-23-009291
- JSON: https://secwatch.observer/filing/0001628280-23-009291.json
- Plain text: https://secwatch.observer/filing/0001628280-23-009291.txt

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