---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-070768"
form_type: "8-K"
ticker: "RGEN"
cik: "0000730272"
company_name: "REPLIGEN CORP"
filed_at: "2024-03-19T23:59:59+00:00"
generated_at: "2026-06-04T14:11:49.016161+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Repligen appoints Maggie A. Pax to Board of Directors, expanding to nine members

## Summary
- Pax elected to board effective March 18, 2024; board expands from eight to nine members.
- Pax brings 25+ years in life sciences, including Thermo Fisher VP Strategy and Innovation (2016-2020).
- Pax received initial option valued at $215,000 vesting over three years, plus pro-rata equity awards.
- Pax is independent under Nasdaq standards; no committee assignments yet.
- Pax also serves on boards of Alimera Sciences, Jellagen, and BioPorto U.S. subsidiary.

## SEC filing metadata
- accession: 0001193125-24-070768
- form_type: 8-K
- ticker: RGEN
- cik: 0000730272
- company_name: REPLIGEN CORP
- filed_at: 2024-03-19T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/730272/000119312524070768/0001193125-24-070768-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/730272/000119312524070768/d768236d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-070768
- JSON: https://secwatch.observer/filing/0001193125-24-070768.json
- Plain text: https://secwatch.observer/filing/0001193125-24-070768.txt

## Key facts
- Executive change
  Margaret A. Pax was elected as Director at REPLIGEN CORP.
  - Action: elected
  - Role: Director
  source text: the Board elected Margaret A. Pax to the Board, effective immediately (the “Effective Date”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/730272/000119312524070768/0001193125-24-070768-index.htm

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