ChipMOS (IMOS) director Wang Jyh-Chau files initial Form 3 ownership

Rhea-AI Filing Summary

CHIPMOS TECHNOLOGIES INC director Wang Jyh-Chau filed an initial ownership report on Form 3. This filing establishes his status as a director and provides a baseline disclosure of his beneficial ownership in the company at the time he became subject to reporting rules. The data shown does not include any buy, sell, or other share transactions.

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Wang Jyh-Chau

(Last) (First) (Middle)

C/O NO 1 R&D ROAD 1

HSINCHU SCIENCE PARK

(Street)

HSINCHU F5 300092

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
03/13/2026

3. Issuer Name and Ticker or Trading Symbol
CHIPMOS TECHNOLOGIES INC [ IMOS ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit List: Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/s/ Hsiu-Ling Teng, attorney-in-fact	03/13/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What does the CHIPMOS TECHNOLOGIES INC (IMOS) Form 3 filing by Wang Jyh-Chau mean?

The Form 3 filing records Wang Jyh-Chau’s initial ownership status as a director of CHIPMOS TECHNOLOGIES INC. It serves as a baseline disclosure when he became subject to insider reporting, but this data excerpt shows no specific share transactions or holdings.

Did Wang Jyh-Chau buy or sell any IMOS shares in this Form 3?

The data excerpt shows no reported purchases, sales, or other share transactions. All transaction-related counts, including buy, sell, and derivative exercises, are recorded as zero in the transaction summary for this initial ownership report.

What role does Wang Jyh-Chau have at CHIPMOS TECHNOLOGIES INC (IMOS)?

In this filing, Wang Jyh-Chau is identified as a director of CHIPMOS TECHNOLOGIES INC. The Form 3 confirms his board role, which triggers ongoing SEC reporting obligations for future transactions in the company’s securities.

How is the transaction activity summarized in the IMOS Form 3 for Wang Jyh-Chau?

The transaction summary shows zero activity across all categories. Buy, sell, acquire, dispose, exercise, gifts, tax withholding, and restructuring shares and counts are all listed as zero, indicating no reportable transactions in this initial statement.

Does the CHIPMOS TECHNOLOGIES INC (IMOS) Form 3 include any derivative positions?

The derivative summary in this data excerpt is empty. That means no options, warrants, or other derivative securities are listed for Wang Jyh-Chau in this initial ownership report based on the provided information.