IMOS 6-K/A

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 June 2025

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 ☐

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 May 28, 2025. The purpose of this Form 6-K/A is to amend the Press Release filed as part of the Form 6-K dated May 28, 2025 to provide an updated ADS cash dividend distribution ratio.

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

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EX-99.1

	Exhibit 99.1
Contacts:<br><br>In Taiwan<br><br>Jesse Huang<br><br>ChipMOS TECHNOLOGIES INC.<br><br>+886-6-5052388 ext. 7715<br><br>[email protected]	In the U.S.<br><br>David Pasquale<br><br>Global IR Partners<br><br>+1-914-337-8801<br><br>[email protected]
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ChipMOS ADJUSTS CASH DIVIDEND DISTRIBUTION RATIO TO APPROXIMATELY NT$1.23 PER COMMON SHARE OR APPROXIMATELY US$0.82 PER ADS

Hsinchu, Taiwan, June 13, 2025 - ChipMOS TECHNOLOGIES INC. (“ChipMOS” or the “Company”) (Taiwan Stock Exchange: 8150 and Nasdaq: IMOS), an industry leading provider of outsourced semiconductor assembly and test services (“OSAT”), announced that the Company adjusted the cash dividend distribution ratio from NT$1.20 per common share to approximately NT$1.23 per common share, following the Company’s cancellation of treasury shares and the repurchase of shares for transfer to employees, which impacted the total number of the Company’s outstanding shares. As a result, the cash dividend per ADS will increase from approximately US$0.80 per ADS to approximately US$0.82 per ADS.

There is no change to any other information disclosed in the original notice filed on May 28, 2025. The dividend was previously approved by the Company’s Board and declared on February 25, 2025. The Company submitted a dividend/distribution form to Nasdaq, as notification of the below actions for the Company’s American Depositary Shares (“ADRs”).

• Type of Distribution: Cash Dividend
• Declaration Date: May 27, 2025
• Ex-Dividend Date: June 27, 2025
• ADR Dividend Record Date: June 27, 2025
• ADR Dividend Distribution Date: July 25, 2025
• ADR books will be closed from June 27 to July 3, 2025
• The final dividend amount to be distributed in U.S. dollars will be determined by the Depositary, Citibank, N.A.,

once it receives the distribution from the Company, which is expected to be on July 18, 2025, converts the

amount from New Taiwan Dollars into U.S. Dollars and deducts appropriate taxes and fees.

Any questions regarding the dividend distribution should be directed to Citibank, N.A.’s Tiffany Ma (Tel: +1-973-461-5734 or [email protected]).

About ChipMOS TECHNOLOGIES INC.:

ChipMOS TECHNOLOGIES INC. (“ChipMOS” or the “Company”) (Taiwan Stock Exchange: 8150 and Nasdaq: IMOS) (www.chipmos.com) is an industry leading provider of outsourced semiconductor assembly and test services. With advanced facilities in Hsinchu Science Park, Hsinchu Industrial Park and Southern Taiwan Science Park in Taiwan, ChipMOS is known for its track record of excellence and history of innovation. The Company provides end-to-end assembly and test services to leading fabless semiconductor companies, integrated device manufacturers and independent semiconductor foundries serving virtually all end markets worldwide.

Forward-Looking Statements

This press release may contain certain forward-looking statements. These forward-looking statements may be identified by words such as ‘believes,’ ‘expects,’ ‘anticipates,’ ‘projects,’ ‘intends,’ ‘should,’ ‘seeks,’ ‘estimates,’ ‘future’ or similar expressions or by discussion of, among other things, strategies, goals, plans or intentions. These statements may include financial projections and estimates and their underlying assumptions, statements regarding tariffs, government policies,

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global trade environments, pricing, plans, objectives and expectations with respect to future operations, products and services, and statements regarding future performance. Actual results may differ materially in the future from those reflected in forward-looking statements contained in this document, due to various factors. Further information regarding these risks, uncertainties and other factors are included in the Company’s most recent Annual Report on Form 20-F filed with the U.S. Securities and Exchange Commission (the “SEC”) and in the Company’s other filings with the SEC.

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