Company: GCTS
Filing Date: 2025-04-23
Form Type: S-3
Source: 0001104659-25-038103
Chunk: 2

Company: GCT Semiconductor Holding, Inc.
Filing Date: 2025-04-23
Form: S-3
Chunk 2
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”). The S-1 Registration Statement registered the issuance by us of up to 10,900,000 shares of our common stock, $0.0001
par value per share (the “Common Stock”) for the offer and sale of up to 10,900,000 shares of Common Stock, by B. Riley Principal
Capital II, LLC, whom we refer to in this prospectus as “B. Riley Principal Capital II” or the “Selling Securityholder.”

<div align='center'>The information in this prospectus is not complete and may be changed. We and the selling securityholders may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and it is not a solicitation of an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

Subject to Completion, dated April23, 2025</div>

PROSPECTUS

<div align='center'>GCT Semiconductor Holding, Inc.

10,900,000 Shares of Common Stock</div>

This
prospectus relates to the offer and sale of up to 10,900,000 shares of our common stock, $0.0001 par value per share (the “Common
Stock”), by B. Riley Principal Capital II, LLC, whom we refer to in this prospectus as “B. Riley Principal Capital II”
or the “Selling Securityholder.” See “Selling Securityholder” for more information about the Selling Securityholder,
including with respect to their acquisition of the securities offered hereby.

The Common
Stock to which this prospectus relates may be issued by us to B. Riley Principal Capital II pursuant to a Common Stock Purchase Agreement,
dated as of April 23, 2024, that we entered into with B. Riley Principal Capital II, which we refer to in this prospectus as the
Purchase Agreement. Such shares of Common Stock include (i) up to 10,843,182 shares of Common Stock that we may, in our sole discretion,
elect to sell to B. Riley Principal Capital II, from time to time after the date of this prospectus, pursuant to the Purchase Agreement
and (ii) 56,818 shares of Common Stock we issued to B. Riley Principal Capital II, upon our execution of the Purchase Agreement on
April 25, 2024, as consideration for its commitment to purchase shares of our Common Stock in one or more purchases that we may