---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-25-044862"
form_type: "8-K"
ticker: "GERN"
cik: "0000886744"
company_name: "GERON CORP"
filed_at: "2025-10-14T23:59:59+00:00"
generated_at: "2026-05-17T04:02:36.364339+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Geron announces COO and CCO departures; appoints new CCO and three senior leaders

## Summary
- COO Andrew Grethlein and CCO Jim Ziegler depart Oct 15, 2025; Grethlein stays as consultant up to 12 months.
- Ahmed ElNawawi appointed EVP, Chief Commercial Officer, effective Oct 20, 2025; ex-Stemline/Novartis.
- Three new SVP appointments: CTO, IR/Corporate Affairs, Portfolio/Project Mgmt; join by Oct 20.
- Director Gaurav Aggarwal resigns immediately; V. Bryan Lawlis not standing for re-election at 2026 meeting.

## SEC filing metadata
- accession: 0001628280-25-044862
- form_type: 8-K
- ticker: GERN
- cik: 0000886744
- company_name: GERON CORP
- filed_at: 2025-10-14T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/886744/000162828025044862/0001628280-25-044862-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/886744/000162828025044862/gern-20251010.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-25-044862
- JSON: https://secwatch.observer/filing/0001628280-25-044862.json
- Plain text: https://secwatch.observer/filing/0001628280-25-044862.txt

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