CHIPMOS TECHNOLOGIES INC (IMOS) director Yang Hong-Tzer submits initial Form 3

Rhea-AI Filing Summary

CHIPMOS TECHNOLOGIES INC director Yang Hong-Tzer filed an initial Form 3, which is a required statement of beneficial ownership for insiders. The filing reports no transactions, no exercised derivatives, and no current holdings or derivative positions listed in the provided data.

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^*

Yang Hong-Tzer

(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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What does the Form 3 filed by Yang Hong-Tzer at CHIPMOS TECHNOLOGIES INC (IMOS) show?

The Form 3 for CHIPMOS TECHNOLOGIES INC director Yang Hong-Tzer reports initial insider status. It shows no reported share purchases, sales, or derivative positions, and lists no holdings in the summarized data provided.

Are there any insider share purchases or sales in this IMOS Form 3 filing?

No, the IMOS Form 3 filing shows no insider purchases or sales. Transaction counts and share amounts for buys, sells, exercises, gifts, and tax withholding are all zero in the transaction summary.

Does Yang Hong-Tzer report any stock options or derivatives in the IMOS Form 3?

No derivative positions are reported for Yang Hong-Tzer in the IMOS Form 3. The derivative summary is empty and the derivativeTransactionCount in the transaction summary is zero, indicating no options or similar instruments disclosed.

What insider role does Yang Hong-Tzer hold at CHIPMOS TECHNOLOGIES INC (IMOS)?

Yang Hong-Tzer is identified as a director of CHIPMOS TECHNOLOGIES INC. The Form 3 flags the reporting person as a director and not as an officer or ten percent owner in the role indicators.

Does this IMOS Form 3 indicate any significant ownership by Yang Hong-Tzer?

The IMOS Form 3 does not show significant ownership for Yang Hong-Tzer in the summarized data. Holding entries are zero and no common stock or derivative positions are listed, so no specific ownership amount appears here.