Exhibit 16.1
April 8, 2024
Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549
Commissioners:
We have read the statements made by GCT Semiconductor Holding, Inc. (f/k/a Concord Acquisition Corp III) under Item 4.01 of its Form 8-K dated April 4, 2024. We agree with the statements concerning our Firm in such Form 8-K; we are not in a position to agree or disagree with other statements of GCT Semiconductor Holding, Inc. (f/k/a Concord Acquisition Corp III) contained therein.
Very truly yours,
/s/ Marcum llp
Marcum llp