IMOS ChipMOS Technologies Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K/A

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of February, 2024

Commission File Number 001-37928

ChipMOS TECHNOLOGIES INC.

(Translation of Registrant’s Name Into English)

No. 1, R&D Rd. 1, Hsinchu Science Park

Hsinchu, Taiwan

Republic of China

(Address of Principal Executive Offices)

(Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.)

Form 20-F ☒ Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ☐

EXPLANATORY NOTE

This Form 6-K/A is being filed by ChipMOS TECHNOLOGIES INC. (the “Company”) as an amendment to the Form 6-K dated February 22, 2024. The purpose of this Form 6-K/A is to amend the Notice to Holders of American Depositary Shares filed as part of the Form 6-K dated February 22, 2024 to provide an updated ADS record date for the Company’s 2024 annual shareholders’ meeting.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

EXHIBIT INDEX

Notice to Holders of American Depositary Shares

ChipMOS TECHNOLOGIES INC. (the “Company”) (Taiwan Stock Exchange: 8150 and NASDAQ: IMOS) provides this notice for the revision to the notice filed on Form 6-K with the U.S. Securities and Exchange Commission on February 22, 2024 (the “Original Notice”). In order to cooperate with our Depositary’s revised schedule, the Company hereby informs ADS holders that the ADS Record Date in connection with the Company’s 2024 annual shareholders’ meeting will now be March 28, 2024, rather than March 29, 2024. There is no change to any other information disclosed in the Original Notice.

For all inquiries, please contact Citibank Shareholder Services at 1-877-CITI-ADR (248-4237).