---
schema_version: "secwatch.filing_event.v1"
accession: "0000929638-26-002285"
form_type: "8-K/A"
ticker: "GCTS"
cik: "0001851961"
company_name: "GCT Semiconductor Holding, Inc."
filed_at: "2026-06-18T21:21:00+00:00"
generated_at: "2026-06-18T21:22:25.542488+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# GCT Semiconductor files legal opinion for ATM share issuance; no amount disclosed

## Summary
- Filed legal opinion (Exhibit 5.1) on shares issuable under ATM Sales Agreement dated April 1, 2025.
- Prospectus supplement filed June 18, 2026 supplements effective S-3 registration statement (File No. 333-286316).
- No offering size or share count specified in the filing; purely procedural registration event.

## SEC filing metadata
- accession: 0000929638-26-002285
- form_type: 8-K/A
- ticker: GCTS
- cik: 0001851961
- company_name: GCT Semiconductor Holding, Inc.
- filed_at: 2026-06-18T21:21:00+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1851961/000092963826002285/0000929638-26-002285-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1851961/000092963826002285/form8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000929638-26-002285
- JSON: https://secwatch.observer/filing/0000929638-26-002285.json
- Plain text: https://secwatch.observer/filing/0000929638-26-002285.txt

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