UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

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

UNDER THE SECURITIES EXCHANGE ACT OF 1934

March 2026

Commission File Number 001-16125

ASE Technology Holding Co., Ltd.

(Translation of registrant’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 annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

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.

	ASE TECHNOLOGY HOLDING CO., LTD.


Date: March 27, 2026	By:	/s/ Joseph Tung
		Name: Joseph Tung
		Title: Chief Financial Officer

Investor Relations Contact:

ir@aseglobal.com

Tel: +886.2.6636.5678

https://www.aseglobal.com

Notice to Holders of American Depositary Receipts

Pursuant to Section 4.16(a) of the Deposit Agreement dated April 30, 2018 among ASE Industrial Holding Co., Ltd., later renamed to ASE Technology Holding, Co., Ltd (“ASE” or “Company”), Citibank, N.A., as depositary (the “Depositary”), and all holders and beneficial owners of American Depositary Receipts (“ADRs”) issued and outstanding thereunder (the “Deposit Agreement”), ASE hereby informs ADR holders of one percent (1%) or more of the total issued and outstanding Shares of the Company that the submission period for the submission of shareholder proposals pursuant to the R.O.C. Company Law in connection with the Company’s 2025 annual general shareholders’ meeting will begin on April 17, 2026 and end on April 27, 2026 (“Submission Period”). Pursuant to Section 4.16(b) of the Deposit Agreement, any proposal submitted by ADR holders must be received by the Depositary at least two business days prior to the expiration of the Submission Period. Therefore, any proposal submitted by ADR holders must be received by the Depositary between April 17, 2026, and April 25, 2026. The 2026 annual general shareholders’ meeting will be held on June 24, 2026, and the ADR record date for this meeting will be April 24, 2026. For all enquiries, please contact Citibank Shareholder Services at 1-877-CITI-ADR (248-4237).

ASE Technology Holding Co., Ltd. 6-K