---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-24-037557"
form_type: "8-K"
ticker: "CYAN"
cik: "0000768408"
company_name: "CYANOTECH CORP"
filed_at: "2024-12-16T23:59:59+00:00"
generated_at: "2026-05-29T03:11:59.844732+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Cyanotech dismisses Grant Thornton, appoints BPM as new auditor for FY2025

## Summary
- Audit Committee dismissed Grant Thornton on Dec 10, 2024; no adverse opinions or disagreements in prior years.
- BPM LLP appointed as independent registered public accounting firm for fiscal year ending March 31, 2025.
- No prior consultations or disagreements with BPM were reported.
- Grant Thornton provided a letter agreeing with the company's disclosures; filed as Exhibit 16.1.

## SEC filing metadata
- accession: 0001437749-24-037557
- form_type: 8-K
- ticker: CYAN
- cik: 0000768408
- company_name: CYANOTECH CORP
- filed_at: 2024-12-16T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 4.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/768408/000143774924037557/0001437749-24-037557-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/768408/000143774924037557/cyan20241214_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-24-037557
- JSON: https://secwatch.observer/filing/0001437749-24-037557.json
- Plain text: https://secwatch.observer/filing/0001437749-24-037557.txt

## Key facts
- Auditor Changes
  CYANOTECH CORP dismissed Grant Thornton LLP as its auditor.
  - Action: dismissal
  - Auditor: Grant Thornton LLP
  - Successor: BPM LLP
  source text: On December 10, 2024, the Audit Committee dismissed Grant Thornton as the Company’s independent registered accounting firm.
  evidence_url: https://www.sec.gov/Archives/edgar/data/768408/000143774924037557/0001437749-24-037557-index.htm
- Auditor Changes
  CYANOTECH CORP engaged BPM LLP as its auditor.
  - Action: engagement
  - Auditor: BPM LLP
  source text: On December 10, 2024, with the Audit Committee’s approval, the Company appointed BPM as the Company’s independent registered public accounting firm for the fiscal year ending March 31, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/768408/000143774924037557/0001437749-24-037557-index.htm

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