---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-040727"
form_type: "8-K"
ticker: "RGEN"
cik: "0000730272"
company_name: "REPLIGEN CORP"
filed_at: "2024-02-21T23:59:59+00:00"
generated_at: "2026-06-05T22:29:40.132459+00:00"
event_type: "earnings"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Repligen Q4 revenue down 16.6% to $155.7M; net loss $0.46/share

## Summary
- Q4 2023 revenue $155.7M vs $186.8M in Q4 2022; full year $638.8M vs $801.5M.
- GAAP net loss $25.5M ($0.46 per diluted share) vs profit of $48.7M ($0.85) in Q4 2022.
- Adjusted EPS $0.33 vs $0.68; book-to-bill ratio 1.03 for second straight quarter.
- FY2024 guidance: revenue $620M-$650M, adjusted EPS $1.42-$1.49.
- Closed Metenova acquisition; launched TangenX SC; issued $600M convertible notes.

## SEC filing metadata
- accession: 0001193125-24-040727
- form_type: 8-K
- ticker: RGEN
- cik: 0000730272
- company_name: REPLIGEN CORP
- filed_at: 2024-02-21T23:59:59+00:00
- event_type: earnings
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/730272/000119312524040727/0001193125-24-040727-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/730272/000119312524040727/d742672d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-040727
- JSON: https://secwatch.observer/filing/0001193125-24-040727.json
- Plain text: https://secwatch.observer/filing/0001193125-24-040727.txt

## Key facts
- Earnings Releases
  REPLIGEN CORP reported financial results for the fourth quarter and year end December 31, 2023.
  - Period: the fourth quarter and year end December 31, 2023
  - Result: reported results
  source text: On February 21, 2024, Repligen Corporation announced its financial results for the fourth quarter and year end December 31, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/730272/000119312524040727/0001193125-24-040727-index.htm

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