---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-385380"
form_type: "8-K"
ticker: "RGEN"
cik: "0000730272"
company_name: "REPLIGEN CORP"
filed_at: "2026-09-08T21:26:46+00:00"
generated_at: "2026-09-08T21:28:09.806330+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Repligen-BioLife merger clears HSR waiting period; stockholder vote set for Oct 5

## Summary
- HSR waiting period for Repligen's acquisition of BioLife expired Sept 3, 2026 at 11:59 PM ET.
- Deal terms: BioLife shareholders receive $11.25 cash plus 0.1442 Repligen shares per share.
- Special BioLife stockholder meeting scheduled Oct 5, 2026 at 9:00 AM ET to vote on merger.
- Closing still subject to BioLife stockholder adoption and other customary conditions.
- Merger agreement originally signed July 21, 2026; Repligen to acquire all BioLife stock.

## SEC filing metadata
- accession: 0001193125-26-385380
- form_type: 8-K
- ticker: RGEN
- cik: 0000730272
- company_name: REPLIGEN CORP
- filed_at: 2026-09-08T21:26:46+00:00
- event_type: m_and_a
- 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/730272/000119312526385380/0001193125-26-385380-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/730272/000119312526385380/d131600d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-385380
- JSON: https://secwatch.observer/filing/0001193125-26-385380.json
- Plain text: https://secwatch.observer/filing/0001193125-26-385380.txt

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