[6-K] ChipMOS TECHNOLOGIES INC Current Report (Foreign Issuer)

Rhea-AI Filing Summary

ChipMOS Technologies announced a board-approved open-market repurchase plan to buy up to 15,000,000 common shares (about 2.09% of issued shares) during 2025/09/03–2025/11/02. The stated repurchase price band is NT$16.80–NT$32.00 with purchases to continue even if the market price falls below NT$16.80. The filing notes a reported ceiling of NT$16,214,828,000 and separately lists a maximum total amount of NT$480,000,000 in the board minutes. The company previously repurchased shares in 2025, completing 61% of one scheduled program and 100% of another, and confirmed the buyback will not affect capital maintenance and is supported by a KGI Securities price reasonableness opinion.

Positive

• Board and audit committee approval obtained with unanimous director consent
• Clear execution period set: 2025/09/03–2025/11/02 and method via centralized market purchases
• Independent price reasonableness opinion provided by KGI Securities
• Repurchase limited to 2.09% of issued shares, indicating a modest, targeted program
• Previous program execution shows management has completed repurchases (one at 100%, one at 61%)

Negative

• Inconsistency in reported monetary ceilings: the document lists both NT$16,214,828,000 and NT$480,000,000 without reconciliation
• Past repurchase not fully executed for one program (only 61% completed), indicating potential market-dependent execution risk
• Repurchase continuation below stated floor (company may buy even if price falls below NT$16.80), which could increase dilution risk if conditions worsen

Insights

Financial Analyst

TL;DR Board-authorized buyback of 15M shares (2.09%) announced; size appears modest relative to total shares and past repurchases were partially executed.

The repurchase schedule and price band indicate flexibility to average purchases over a two-month window, and management authorized the chairman to set execution details. The program size (15,000,000 shares) and the 2.09% cap suggest a targeted, moderate capital return rather than a large-scale capital allocation shift. Historical execution shows one recent program completed fully and another covered 61% of target, implying management uses phased execution tied to market conditions. The filing cites independent price reasonableness and a statement that capital maintenance will not be affected, which are standard governance and solvency disclosures.

Corporate Governance Expert

TL;DR Governance process completed: audit committee and full board approval with delegated execution authority; documentation includes third-party opinion.

The repurchase was approved unanimously by nine attending directors and cleared by the audit committee, and the board empowered the chairman (and designee) to determine operational details. The filing references a KGI Securities opinion on price reasonableness and an assessment that capital maintenance is preserved, aligning with good-practice controls for buybacks. Note the filing records two different monetary ceilings (NT$16,214,828,000 and NT$480,000,000), which are both stated in the content and should be reconciled in the company record for clarity.

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 September 2025

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: September 2, 2025				By		/S/ S. J. Cheng
				Name:		S. J. Cheng
				Title:		Chairman & President

English translation of Company’s September 2, 2025 filing with the Taiwan Stock Exchange Corporation’s (“TWSE”) Market Observation Post System (“MOPS”). Attached as Exhibit 99.1 is our related press release issued on September 2, 2025.

Date of announcement: 2025/09/02

Subject: Announcement of the Company’s Board of Directors resolution to repurchase shares

Date of events: 2025/09/02

To which item it meets: Article 4, Paragraph 1, Item 35 of the Taiwan Stock Exchange Corporation Procedures for Verification and Disclosure of Material Information of Companies with Listed Securities

Statement:

1.Date of the board of directors resolution: 2025/09/02

2.Purpose of the share repurchase: To maintain the Company’s credibility and shareholders’ equity

3.Type of shares to be repurchased: Common shares

4.Ceiling on total monetary amount of the share repurchase (NTD): 16,214,828,000

5.Scheduled period for the repurchase: 2025/09/03~2025/11/02

6.Number of shares to be repurchased (shares): 15,000,000

7.Repurchase price range (NTD): 16.80~32.00, repurchase to continue even when the share price falls below the lower end of such price range

8.Method for the repurchase: To repurchase in the centralized securities exchange market

9.Shares to be repurchased as a percentage of total issued shares of the Company (%): 2.09

10.Cumulative number of the Company’s own shares held at the time of reporting (shares): 9,105,000

11.Status of repurchases within three years prior to the time of reporting:

(1)Actual period for repurchase: 2025/05/14~2025/07/11; Scheduled repurchase (shares): 15,000,000; Actual repurchase (shares): 9,105,000; Status of implementation (Actual shares repurchase as a percentage of scheduled repurchase): 61.00%

(2)Actual period for repurchase: 2025/02/03~2025/03/14; Scheduled repurchase (shares): 10,000,000; Actual repurchase (shares): 10,000,000; Status of implementation (Actual shares repurchase as a percentage of scheduled repurchase): 100%

12.Status of repurchases that have been reported but not yet completed: During the Company’s fifth share repurchase period, in order to protect the interests of shareholders and take into account the market mechanisms, the Company adopted a phased repurchase strategy within the price range depending on the stock price changes. As the result, the repurchase was not fully executed.

13.Minutes of the board of directors meeting that resolved for the share repurchase:

Subject: The Company intends to repurchase shares as treasury shares and cancel such treasury shares in accordance with the law.

Explanatory Note:

1.According to Articles 28-2 of the “Securities and Exchange Act” and “Regulations Governing Share Repurchase by Exchange-Listed and OTC-Listed Companies”.

2.The proposed details for the repurchase of the Company’s shares are as follows:

(1)Purpose of the share repurchase: To maintain the Company’s credibility and shareholders’ equity.

(2)Type of shares to be repurchased: Common shares.

(3)Maximum total amount of shares to be repurchased: NT$480,000,000.

(4)Scheduled period for the repurchase: 2025/09/03~2025/11/02.

(5)Number of shares to be repurchased: 15,000,000 shares (A percentage of total issued shares of the Company: 2.09%).

(6)Repurchase price range: NT$16.80~NT$32.00, repurchase to continue even when the share price falls below the lower end of such price range.

(7)Method for the repurchase: Authorize a securities firm to repurchase in the centralized securities exchange market using open market purchases.

3.The reasonableness of the price of the shares to be repurchased has been obtained from KGI Securities Co., Ltd., please refer to Attachment 1.

4.The maintenance of the Company’s capital would not be affected by the repurchase, please refer to Attachment 2.

5.It is proposed that the Chairman be authorized and their designee to fully represent the Company in handling matters related to the share repurchase and cancellation, including but not limited to determining the actual total number of shares to be repurchased, daily repurchase quantities, the actual transaction price per share, and signing related documents.

6.This proposal has been approved by the 10th meeting of the 7th Audit Committee, and is hereby submitted to the Board of Directors for approval.

7.Based on the foregoing, this proposal is hereby submitted to the Board of Directors for approval.

Resolution: Approved by all members present in the meeting.

14.The Rules for Transfer of Shares set forth in Article 10 of the Regulations Governing Share Repurchase by Exchange-Listed and OTC-Listed Companies: N/A

15.The Rules for Conversion of Shares or the Rules for Subscription of Shares set forth in Article 11 of the Regulations Governing Share Repurchase by Exchange-Listed and OTC-Listed Companies: N/A

16.Declaration that the financial status of the Company has been considered by the board of directors, and that its capital maintenance will not be affected:

1.The Company resolved to repurchase 15,000,000 shares within two months from the date of filing through the centralized securities exchange market (the place of business of a securities firm), on September 2, 2025, during the 11th meeting of the 11th Board of Directors, with more than two-thirds of the directors present and a majority of the attending directors in agreement.

2.The total number of shares to be repurchased represents approximately 2.09% of the Company’s issued shares, and the maximum amount required for the repurchase accounts for approximately 2.08% of the Company’s current assets. The Board of Directors has duly considered the Company’s financial position and hereby declares that the repurchase of the aforementioned shares is based on the current valuation not fully reflecting the Company’s long-term fundamentals and it will not affect the maintenance of the Company’s capital.

3.This declaration has been approved by the aforementioned Board meeting, with all nine attending directors consenting to its contents. This statement is hereby issued.

17.Appraisal or opinion by a CPA or securities underwriter about the reasonableness of the share repurchase price:

According to the evaluation opinion provided by KGI Securities Co., Ltd., the proposed repurchase price range for the Company’s shares, set between NT$16.80 and NT$32.00 per share, is deemed reasonable. The evaluation also concludes that the repurchase will not have any significant adverse impact on the Company’s financial structure, net asset value per share, earnings per share, return on equity, liquidity ratio, etc.

The total amount for the proposed share repurchase, calculated at the maximum price of NT$32.00 per share, is NT$480 million. Based on the Company’s Q2 2025 financial report, retained earnings (excluding special reserves), capital surplus, realized capital reserves, and the amounts deducted for declared distributions collectively amount to NT$16,214,828 thousand. This figure represents the maximum allowable amount for share repurchases, as stipulated by the “Regulations Governing Share Repurchase by Exchange-Listed and OTC-Listed Companies”.

The calculations confirm that the proposed repurchase amount does not exceed the regulatory limits, and the predetermined repurchase price range is deemed reasonable.

18.Other matters stipulated by the SFB: None

EXHIBIT INDEX

Exhibit Number		Description
99.1		Press release issued by ChipMOS on September 2, 2025.

FAQ

What is the size and period of IMOS's announced share repurchase?

The board approved repurchasing 15,000,000 common shares (~2.09% of issued shares) between 2025/09/03 and 2025/11/02.

What price range will ChipMOS use to repurchase shares?

The repurchase price band is stated as NT$16.80–NT$32.00, and the company may continue repurchasing even if the market price falls below NT$16.80.

How much monetary capacity is allocated for the buyback?

The filing includes two referenced ceilings: NT$16,214,828,000 and separately NT$480,000,000 in the board minutes; the document does not reconcile these figures.

Has ChipMOS repurchased shares recently and with what execution?

Yes. In 2025 the company completed 10,000,000 shares (100%) in one program and 9,105,000 shares (61%) in another scheduled 15,000,000-share program.

Who is authorized to execute the repurchase on behalf of the company?

The chairman and their designee are authorized to determine final repurchase quantities, daily purchases, transaction prices, and to sign related documents.