---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-24-044718"
form_type: "8-K"
ticker: "GCTS"
cik: "0001851961"
company_name: "GCT Semiconductor Holding, Inc."
filed_at: "2024-04-08T23:59:59+00:00"
generated_at: "2026-06-04T01:31:22.987332+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# GCT Semiconductor replaces auditor Marcum with BPM after business combination

## Summary
- BPM LLP appointed as independent auditor for fiscal year 2024, effective April 4, 2024.
- Marcum LLP dismissed as prior auditor; no disagreements on accounting principles or audit scope.
- Marcum's prior reports included a going-concern paragraph; material weakness in accounting for complex instruments noted.
- Company provided Marcum with disclosure copy; Marcum letter to SEC attached as Exhibit 16.1.

## SEC filing metadata
- accession: 0001104659-24-044718
- form_type: 8-K
- ticker: GCTS
- cik: 0001851961
- company_name: GCT Semiconductor Holding, Inc.
- filed_at: 2024-04-08T23:59:59+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/1851961/000110465924044718/0001104659-24-044718-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1851961/000110465924044718/tm2411295d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-24-044718
- JSON: https://secwatch.observer/filing/0001104659-24-044718.json
- Plain text: https://secwatch.observer/filing/0001104659-24-044718.txt

## Key facts
- Auditor Changes
  GCT Semiconductor Holding, Inc. engaged BPM LLP as its auditor.
  - Action: engagement
  - Auditor: BPM LLP
  source text: On April 4, 2023, the Audit Committee of the Board of Directors of GCT Semiconductor Holding, Inc., (f/k/a Concord Acquisition Corp III) (the “Company”) approved the engagement of BPM LLP (“BPM”) as the Company’s independent registered public accounting firm to audit the Company’s consolidated financial statements for the fiscal year ended December 31, 2024, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1851961/000110465924044718/0001104659-24-044718-index.htm
- Auditor Changes
  GCT Semiconductor Holding, Inc. dismissed Marcum LLP as its auditor.
  - Action: dismissal
  - Auditor: Marcum LLP
  - Successor: BPM LLP
  source text: Accordingly, Marcum LLP (“Marcum”), Concord III’s independent registered public accounting firm prior to the Business Combination, was informed on April 4, 2024 that it was dismissed and replaced by BPM as the Company’s independent registered public accounting firm.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1851961/000110465924044718/0001104659-24-044718-index.htm

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