# EDGAR Filing Document

**Accession Number:** 0001851961
**File Stem:** 0000929638-25-002188
**Filing Date:** 2025-6
**Character Count:** 8012
**Document Hash:** 6880a2c04498d72efe6b2a53197b78cd
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000929638-25-002188.hdr.sgml**: 20250606

**ACCESSION NUMBER**: 0000929638-25-002188

**CONFORMED SUBMISSION TYPE**: POS AM

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250606

**DATE AS OF CHANGE**: 20250606

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** GCT Semiconductor Holding, Inc.
- **CENTRAL INDEX KEY:** 0001851961
- **STANDARD INDUSTRIAL CLASSIFICATION:** SEMICONDUCTORS & RELATED DEVICES [3674]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 862171699
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** POS AM
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-278809
- **FILM NUMBER:** 251031960

**BUSINESS ADDRESS:**
- **STREET 1:** 2290 NORTH 1ST STREET
- **STREET 2:** SUITE 201
- **CITY:** SAN JOSE
- **STATE:** CA
- **ZIP:** 95131
- **BUSINESS PHONE:** 408-434-6040

**MAIL ADDRESS:**
- **STREET 1:** 2290 NORTH 1ST STREET
- **STREET 2:** SUITE 201
- **CITY:** SAN JOSE
- **STATE:** CA
- **ZIP:** 95131

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Concord Acquisition Corp III
- **DATE OF NAME CHANGE:** 20210318

#### As filed with the Securities and Exchange Commission on June 6, 2025

#### Registration No. 333-278809

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

### POST-EFFECTIVE AMENDMENT NO. 1

#### TO

#### FORM S-1 REGISTRATION STATEMENT NO. 333-278809

#### UNDER

#### THE SECURITIES ACT OF 1933

### GCT Semiconductor Holding, Inc.

#### (Exact name of registrant as specified in its charter)

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| | | |
|:---|:---|:---|
| **Delaware** | **6770** | **86-2171699** |
| **(State or other jurisdiction of**<br> **incorporation or organization)** | **(Primary Standard Industrial**<br> **Classification Code Number)** | **(I.R.S. Employer**<br> **Identification Number)** |

---

#### GCT Semiconductor Holding, Inc.

#### 2290 North 1st Street, Suite 201

#### San Jose, California 95131
(408) 434-6040

#### (Address, including zip code, and telephone number, including area code, of registrant's principal executive offices)

#### John Schlaefer

#### Chief Executive Officer

#### GCT Semiconductor Holding, Inc.

#### 2290 North 1st Street, Suite 201

#### San Jose, California 95131
(408) 434-6040

#### (Name, address, including zip code, and telephone number, including area code, of agent for service)

#### With copies to:

#### Albert Lung, Esq.

#### Morgan, Lewis & Bockius LLP

#### 1400 Page Mill Road

#### Palo Alto, CA 94304
(650) 843-4000

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Approximate date of commencement of proposed sale to the public: Not applicable.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ⌧

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ☐

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or classes of additional securities pursuant to Rule 413(b) under the Securities Act, check the following box. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

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| | | | |
|:---|:---|:---|:---|
| Large accelerated filer | ☐ | Accelerated filer | ☐ |
| Non-accelerated filer | ☒ | Smaller reporting company | ☒ |
|  |  | Emerging growth company | ☒ |

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If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of Securities Act. ☐

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#### DEREGISTRATION OF SECURITIES
GCT Semiconductor Holding, Inc., a Delaware corporation (the "<u>Registrant</u>"), is filing this Post-Effective Amendment No. 1 (the "<u>Amendment</u>") to the Registration Statement on Form S-1 (File No. 333-278809) filed by the Registrant with the Securities and Exchange Commission ("<u>SEC</u>") on May 23, 2024 and declared effective on June 03, 2024 ("<u>S-1 Registration Statement</u>"), to deregister any and all securities of the Registrant registered but unsold or otherwise unissued under the S-1 Registration Statement as of the date hereof.

The S-1 Registration Statement registered (i) the issuance by us of up to 26,724,001 shares of our common stock underlying warrants, (ii) the future resale of up to 35,970,732 shares of our common stock, and (iii) the future resale of up to 6,580,000 private placement warrants, held by the selling securityholders named in the prospectus, as required by the registration rights agreement that we initially entered into with certain of the selling securityholders on March 26, 2024.

On May 30, 2025, the Registrant filed a Registration Statement on Form S-3 (File No. 333-286704) with the SEC, which was declared effective on June 6, 2025, to register all unsold or unissued securities under the S-1 Registration Statement and to register for resale certain warrants as required by the securities purchase agreement that we initially entered into with certain of the selling securityholders on September 26, 2024.

For ease of reference, all share numbers above are as stated in the S-1 Registration Statement.

Any and all offerings of the Registrant's securities pursuant to the S-1 Registration Statement have been terminated. Accordingly, the Registrant hereby terminates the effectiveness of the S-1 Registration Statement. In addition, in accordance with undertakings made by the Registrant in the S-1 Registration Statement to remove from registration, by means of a post-effective amendment, any securities being registered which remain unsold at the termination of the offering, the Registrant hereby removes from registration all securities registered under the S-1 Registration Statement that remain unsold under the S-1 Registration Statement as of the date hereof. The S-1 Registration Statement is hereby amended, as appropriate, to reflect the deregistration of such securities.

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#### SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Post-Effective Amendment No. 1 to the Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized in San Jose, California, on June 6, 2025.

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| | |
|:---|:---|
| **GCT SEMICONDUCTOR HOLDING, INC.** | **GCT SEMICONDUCTOR HOLDING, INC.** |
| By: | /s/ John Schlaefer |
| Name: | John Schlaefer |
| Title: | Chief Executive Officer |

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No other person is required to sign this Post-Effective Amendment No. 1 to the Registration Statement in reliance on Rule 478 of the Securities Act of 1933, as amended.