---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-26-025865"
form_type: "8-K/A"
ticker: "LNZA"
cik: "0001843724"
company_name: "LanzaTech Global, Inc."
filed_at: "2026-04-17T23:59:59+00:00"
generated_at: "2026-05-15T05:35:00.003031+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# LanzaTech dismisses Deloitte, names BDO as auditor; prior reports flagged going-concern doubt

## Summary
- Dismissed Deloitte & Touche and engaged BDO USA as independent auditor for FY2026, effective April 10, 2026.
- Deloitte's 2024 and 2025 audit reports included a going-concern explanatory paragraph.
- Material weaknesses in internal controls were identified (complex transactions, revenue recognition, control environment).
- No accounting disagreements with Deloitte; Deloitte provided letter agreeing with company's disclosures.
- No prior consultations with BDO on accounting principles or audit opinions.

## SEC filing metadata
- accession: 0001628280-26-025865
- form_type: 8-K/A
- ticker: LNZA
- cik: 0001843724
- company_name: LanzaTech Global, Inc.
- filed_at: 2026-04-17T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 4.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1843724/000162828026025865/0001628280-26-025865-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1843724/000162828026025865/amci-20260410.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-26-025865
- JSON: https://secwatch.observer/filing/0001628280-26-025865.json
- Plain text: https://secwatch.observer/filing/0001628280-26-025865.txt

## Key facts
- Auditor Changes
  LanzaTech Global, Inc. engaged BDO USA, P.C. as its auditor.
  - Action: engagement
  - Auditor: BDO USA, P.C.
  source text: the Board of Directors of the Company ratified and approved the engagement of BDO as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026, effective April 10, 2026
  evidence_url: https://www.sec.gov/Archives/edgar/data/1843724/000162828026025865/0001628280-26-025865-index.htm
- Auditor Changes
  LanzaTech Global, Inc. dismissed Deloitte as its auditor.
  - Action: dismissal
  - Auditor: Deloitte
  - Successor: BDO USA, P.C.
  source text: the Board of Directors of LanzaTech Global, Inc. ratified and approved the dismissal of Deloitte as the Company’s independent registered public accounting firm, effective April 10, 2026
  evidence_url: https://www.sec.gov/Archives/edgar/data/1843724/000162828026025865/0001628280-26-025865-index.htm

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