ChipMOS Technologies (IMOS) president discloses large direct and indirect stake

Rhea-AI Filing Summary

CHIPMOS TECHNOLOGIES INC president and director Cheng Shih Jye filed an initial ownership report showing substantial holdings of the company’s common stock. This Form 3 does not record new trades but establishes his existing stake as an insider.

He reports 5,160,161 shares held directly. He also reports 6,244,777 shares held indirectly through Hao Hsiang Investment Co., Ltd., where he serves as representative and director, and 1,000,000 shares held indirectly through his spouse.

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^*

Cheng Shih Jye

(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)
03/16/2026

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
X	Officer (give title below)		Other (specify below)
	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	5,160,161	D
Common Stock	6,244,777	I	By Hao Hsiang Investment Co., Ltd.(1)
Common Stock	1,000,000	I	By Spouse

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:

1. Shih-Jye Cheng serves as the representative and director of Hao Hsiang Investment Co., Ltd.

Remarks:

Exhibit List: Exhibit 24 - Power of Attorney

	/s/ Hsiu-Ling Teng, attorney-in-fact	03/16/2026
	** 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 IMOS Form 3 filing by Cheng Shih Jye show?

The Form 3 filing shows Cheng Shih Jye’s existing ownership of ChipMOS Technologies common stock as he becomes a reporting insider. It lists his direct and indirect share positions but does not disclose any new stock purchases or sales.

How many ChipMOS (IMOS) shares does Cheng Shih Jye hold directly?

Cheng Shih Jye reports 5,160,161 shares of ChipMOS common stock held directly. This direct position represents stock registered in his own name, separate from additional indirect holdings through an investment company and his spouse reported in the same Form 3.

What indirect ChipMOS (IMOS) holdings are reported through Hao Hsiang Investment?

The filing reports 6,244,777 ChipMOS common shares held indirectly through Hao Hsiang Investment Co., Ltd. Cheng Shih Jye serves as the representative and director of this entity, linking these shares to him for reporting purposes under insider ownership rules.

How many IMOS shares are attributed to Cheng Shih Jye’s spouse?

The Form 3 attributes 1,000,000 ChipMOS common shares to Cheng Shih Jye’s spouse as an indirect holding. Spousal holdings are commonly included in insider ownership disclosures because they may be considered part of the insider’s overall beneficial stake.

Does the IMOS Form 3 indicate any recent insider buying or selling?

The Form 3 does not indicate recent insider buying or selling. It classifies the entries as holdings, with unknown transaction codes, meaning the document’s purpose is to report Cheng Shih Jye’s existing ownership when he became subject to insider reporting.

Why is Hao Hsiang Investment mentioned in the IMOS Form 3 footnote?

A footnote explains that Shih-Jye Cheng serves as representative and director of Hao Hsiang Investment Co., Ltd. This clarifies his relationship to the entity that holds 6,244,777 ChipMOS shares, supporting why those shares are reported as part of his indirect beneficial ownership.