UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TORULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

January 2026 

Commission File Number 001-16125

ASE TechnologyHolding Co., Ltd.

(Translation ofregistrant’s name into English)

26, Chin 3rd Road

Kaohsiung, Taiwan

Republic of China

(Address of principal executive offices)

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

SIGNATURES

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

Investor Relations Contact 

ir@aseglobal.com 

Tel: +886.2.6636.5678 

https://www.aseglobal.com

ASETechnology Holding Co., Ltd.
Announces Monthly Net Revenues*

Taipei,Taiwan, R.O.C., January 9, 2026 – ASE Technology Holding Co., Ltd. (NYSE:ASX, TAIEX: 3711, “ASEH” or the “Company”),announces its unaudited consolidated net revenues for December, 4^th quarter and full year of 2025.

Consolidatednet revenues (unaudited)

Net revenues for ATM assembly, testingand material business are as follows:

atm netrevenues (unaudited)

*This press release is intended to comply with Taiwan regulatory requirements.

Safe Harbor Notice: 

This press releasecontains "forward-looking statements" within the meaning of Section 27A of the United States Securities Act of 1933, as amended,and Section 21E of the United States Securities Exchange Act of 1934, as amended. These statements are made under the “safe harbor”provisions of the U.S. Private Securities Litigation Reform Act of 1995. Although these forward-looking statements, which may includestatements regarding our future results of operations, financial condition or business prospects, are based on our own information andinformation from other sources we believe to be reliable, you should not place undue reliance on these forward-looking statements, whichapply only as of the date of this press release. The words “anticipate,” “believe,” “estimate,” “expect,”“intend,” “plan” and similar expressions, as they relate to us, are intended to identify these forward-lookingstatements in this press release. These forward-looking statements are necessarily estimates reflecting the best judgment of our seniormanagement and our actual results of operations, financial condition or business prospects may differ materially from those expressedor implied by the forward-looking statements for reasons including, among others, risks associated with cyclicality and market conditionsin the semiconductor or electronic industry; changes in our regulatory environment, including our ability to comply with new or stricterenvironmental regulations and to resolve environmental liabilities; demand for the outsourced semiconductor packaging, testing and electronicmanufacturing services we offer and for such outsourced services generally; the highly competitive semiconductor or manufacturing industrywe are involved in; our ability to introduce new technologies in order to remain competitive; international business activities; ourbusiness strategy; our future expansion plans and capital expenditures; the strained relationship between the Republic of China and thePeople’s Republic of China; general economic and political conditions; the recent shift in United States trade policies; possibledisruptions in commercial activities caused by natural or human-induced disasters; fluctuations in foreign currency exchange rates; andother factors. For a discussion of these risks and other factors, please see the documents we file from time to time with the Securitiesand Exchange Commission, including the 2024 Annual Report on Form 20-F filed on March 27, 2025.