---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-25-040447"
form_type: "8-K"
ticker: "LNZA"
cik: "0001843724"
company_name: "LanzaTech Global, Inc."
filed_at: "2025-08-15T23:59:59+00:00"
generated_at: "2026-05-17T12:30:48.408351+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# LanzaTech announces 1-for-100 reverse stock split to regain Nasdaq compliance; president Cuellar resigns

## Summary
- Reverse stock split effective Aug 18, 2025; every 100 shares become 1 to meet Nasdaq minimum bid price.
- Authorized shares increased from 600M to 2.58B pre-split, then drop to 25.8M post-split; par value reduced.
- President Aura Cuellar steps down; effective date TBD; departure not due to disagreement.
- Fractional shares rounded up; proportionate adjustments to warrants and equity awards.

## SEC filing metadata
- accession: 0001628280-25-040447
- form_type: 8-K
- ticker: LNZA
- cik: 0001843724
- company_name: LanzaTech Global, Inc.
- filed_at: 2025-08-15T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1843724/000162828025040447/0001628280-25-040447-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1843724/000162828025040447/amci-20250813.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-25-040447
- JSON: https://secwatch.observer/filing/0001628280-25-040447.json
- Plain text: https://secwatch.observer/filing/0001628280-25-040447.txt

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