ChipMOS Technologies (IMOS) EVP reports 230,130-share Form 3 holding

Rhea-AI Filing Summary

CHIPMOS TECHNOLOGIES INC executive vice president Hsu Yuan-Feng filed an initial ownership report showing their equity stake in the company. The Form 3 indicates direct ownership of 230,130 shares of Common Stock. This filing establishes the baseline holdings that future insider transaction reports will reference.

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^*

Hsu Yuan-Feng

(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)

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

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)
Common Stock	230,130	D

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

	/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 (IMOS) Form 3 filing show for Hsu Yuan-Feng?

The Form 3 filing shows that Executive Vice President Hsu Yuan-Feng directly owns 230,130 shares of Common Stock in CHIPMOS TECHNOLOGIES INC. This establishes an initial ownership baseline for future insider trading disclosures.

Is the CHIPMOS (IMOS) Form 3 a buy or sell transaction?

The Form 3 for CHIPMOS TECHNOLOGIES INC is not a buy or sell transaction. It is an initial ownership statement, listing that Executive Vice President Hsu Yuan-Feng directly holds 230,130 common shares at the time of reporting.

How many CHIPMOS (IMOS) shares does Hsu Yuan-Feng directly own?

Executive Vice President Hsu Yuan-Feng directly owns 230,130 shares of Common Stock in CHIPMOS TECHNOLOGIES INC according to the Form 3 filing. This reflects reported holdings, not a new transaction in the company’s stock.

Why is CHIPMOS (IMOS) insider Hsu Yuan-Feng filing a Form 3?

Form 3 is required when someone becomes an insider of a public company. For CHIPMOS TECHNOLOGIES INC, it records Executive Vice President Hsu Yuan-Feng’s initial direct ownership of 230,130 common shares as a baseline for later Form 4 or Form 5 filings.

Does the CHIPMOS (IMOS) Form 3 indicate any derivative positions?

The Form 3 data for CHIPMOS TECHNOLOGIES INC shows no derivative securities reported for Executive Vice President Hsu Yuan-Feng. Only direct ownership of 230,130 shares of Common Stock is disclosed in this filing snapshot.