ChipMOS (IMOS) invests NT$512,231k in plant engineering works and equipment

Rhea-AI Filing Summary

ChipMOS TECHNOLOGIES INC. reported the acquisition of plant engineering works and equipment accessories with a total transaction price of NT$512,231 thousand. The transactions occurred from 2025/07/02 to 2026/06/23 and were approved on 2026/06/23 by the Company’s President.

The counterparty is MAU TSWEN MECHANICAL ENGINEERING CO., LTD., which has no related-party relationship with ChipMOS. The company states the acquisition is for manufacturing purposes and that pricing was determined by reference to market value and mutual negotiation under internal authorization procedures.

Key Figures

Total transaction price: NT$512,231 thousand Transaction period: 2025/07/02–2026/06/23 Approval date: 2026/06/23 +2 more

5 metrics

Total transaction price NT$512,231 thousand Acquisition of plant engineering works and equipment accessories

Transaction period 2025/07/02–2026/06/23 Date of occurrence of the event

Approval date 2026/06/23 Approved by President of the Company

Counterparty name MAU TSWEN MECHANICAL ENGINEERING CO., LTD. Trading counterparty, not a related party

Purpose of acquisition For manufacturing purpose Stated concrete use of acquired works and accessories

Key Terms

plant engineering works, related party, Market Observation Post System, Regulations Governing the Acquisition and Disposal of Assets by Public Companies

4 terms

plant engineering works financial

"Name and nature of the underlying asset: Plant engineering works and equipment accessories"

related party financial

"Whether the counterparty of the current transaction is a related party: No"

A related party is a person or organization with close ties to a company — for example major shareholders, board members, executives, their family, or businesses they control — that can influence decisions or enter into transactions with the company. Investors watch related‑party dealings because they can create conflicts of interest or non‑market terms that affect fairness, the company’s finances and transparency; think of it like buying or selling something to a family member rather than on the open market.

Market Observation Post System regulatory

"filing with the Taiwan Stock Exchange Corporation’s Market Observation Post System (MOPS)"

Regulations Governing the Acquisition and Disposal of Assets by Public Companies regulatory

"The price assessed in accordance with the Article 16 of the Regulations Governing the Acquisition and Disposal of Assets by Public Companies"

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Form 6-K: How Foreign Companies Report to the SEC →

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of June 2026

Commission File Number 001-37928

ChipMOS TECHNOLOGIES INC.

(Translation of Registrant’s Name into English)

No. 1, R&D Rd. 1, Hsinchu Science Park

Hsinchu, 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.

						ChipMOS TECHNOLOGIES INC.
						(Registrant)
Date: June 23, 2026				By		/S/ S. J. Cheng
				Name:		S. J. Cheng
				Title:		Chairman & President

English translation of Company’s June 23, 2026 filing with the Taiwan Stock Exchange Corporation’s (“TWSE”)
Market Observation Post System (“MOPS”).

Date of announcement: 2026/06/23

Subject: The acquisition of plant engineering works and equipment accessories

Date of events: 2026/06/23

To which item it meets: Article 4, Paragraph 1, Item 20 of the Taiwan Stock Exchange Corporation Procedures for Verification and Disclosure of Material Information of Companies with Listed Securities

Statement:

1.Name and nature of the underlying asset (e.g., land located at Sublot XX, Lot XX, North District, Taichung City): Plant engineering works and equipment accessories

2.Date of occurrence of the event: 2025/07/02~2026/06/23

3.Date of the board of directors resolution: Not applicable

4.Other approval date: 2026/06/23 (approval level: President of the Company).

5.Transaction unit amount (e.g. XX square meters, equivalent to XX ping), unit price, and total transaction price:

The acquisition of plant engineering works and equipment accessories with a total transaction price of NT$512,231 thousand.

6.Trading counterparty and its relationship with the Company (if the trading counterparty is a natural person and furthermore is not a related party of the Company, the name of the trading counterparty is not required to be disclosed):

Trading counterparty: MAU TSWEN MECHANICAL ENGINEERING CO., LTD.

Relation with the Company: None

7.Where the trading counterparty is a related party, announcement shall also be made of the reason for choosing the related party as trading counterparty and the identity of the previous owner, its relationship with the Company and the trading counterparty, and the previous date and monetary amount of transfer: Not applicable

8.Where an owner of the underlying assets within the past five years has been a related party of the Company, the announcement shall also include the date and price of acquisition and disposal by the related party, and its relationship with the Company at the time of the transaction: Not applicable

9.Projected gain (or loss) through disposal (not applicable for acquisition of assets; those with deferral should provide a table explaining recognition): Not applicable

10.Terms of delivery or payment (including payment period and monetary amount), restrictive covenants in the contract, and other important terms and conditions:

The Company will perform pursuant to the terms and conditions set forth in the purchase orders agreed by both parties.

11.The manner of deciding on this transaction (such as invitation to tender, price comparison, or price negotiation), the reference basis for the decision on price, and the decision-making unit:

The Company has referred to the market value and negotiated through mutual agreement between both parties, and handled in accordance with the internal authorization.

12.Name of the professional appraisal firm or company and its appraisal price: Not applicable

13.Name of the professional appraiser: Not applicable

14.Practice certificate number of the professional appraiser: Not applicable

15.The appraisal report has a limited price, specific price, or special price: Not applicable

16.An appraisal report has not yet been obtained: Not applicable

17.Reason for an appraisal report not being obtained: Not applicable

18.Reason for any significant discrepancy with the appraisal reports and opinion of the CPA: Not applicable

19.Name of the CPA firm: Not applicable

20.Name of the CPA: Not applicable

21.Practice certificate number of the CPA: Not applicable

22.Broker and broker’s fee: Not applicable

23.Concrete purpose or use of the acquisition or disposal: For manufacturing purpose

24.Any dissenting opinions of directors to the present transaction: Not applicable

25.Whether the counterparty of the current transaction is a related party: No

26.Date of ratification by supervisors or approval by the audit committee: Not applicable

27.The transaction is to acquire a real property or right-of-use asset from a related party: No

28.The price assessed in accordance with the Article 16 of the Regulations Governing the Acquisition and Disposal of Assets by Public Companies: Not applicable

29.Where the above assessed price is lower than the transaction price, the price assessed in accordance with the Article 17 of the same regulations: Not applicable

30.Date on which material information regarding the same event has been previously released: Not applicable

31.Any other matters that need to be specified: None

FAQ

What transaction did ChipMOS (IMOS) disclose in its June 2026 Form 6-K?

ChipMOS disclosed acquiring plant engineering works and equipment accessories for NT$512,231 thousand. The transactions occurred between 2025/07/02 and 2026/06/23 and were approved by the Company’s President on 2026/06/23 for manufacturing-related purposes.

How much did ChipMOS (IMOS) spend on plant engineering works and equipment accessories?

ChipMOS reports a total transaction price of NT$512,231 thousand for plant engineering works and equipment accessories. This amount covers purchases made over the period from 2025/07/02 through 2026/06/23, as disclosed in the company’s announcement.

Who is the counterparty in ChipMOS (IMOS) plant engineering and equipment transaction?

The trading counterparty is MAU TSWEN MECHANICAL ENGINEERING CO., LTD., which has no related-party relationship with ChipMOS. The company states that the price was negotiated by mutual agreement and handled according to ChipMOS’s internal authorization procedures.

Was the ChipMOS (IMOS) plant engineering acquisition a related-party transaction?

No. ChipMOS explicitly states that MAU TSWEN MECHANICAL ENGINEERING CO., LTD. has no relationship with the company and confirms the counterparty is not a related party. Therefore, related-party disclosure items and appraisal requirements are noted as not applicable.

What is the purpose of ChipMOS (IMOS) acquiring plant engineering works and equipment accessories?

ChipMOS indicates the acquisition’s concrete purpose is for manufacturing. The company is investing in plant engineering works and equipment accessories to support its manufacturing activities, according to the material information released through Taiwan’s Market Observation Post System.

How was the transaction price determined in ChipMOS (IMOS) recent acquisition?

ChipMOS states it referred to market value and negotiated the price through mutual agreement with the counterparty. The transaction was handled in accordance with the company’s internal authorization procedures, rather than through a formal tender or external professional appraisal.