Chunghwa Telecom (NYSE: CHT) details office raid and 4.6B kWh green energy pact

Rhea-AI Filing Summary

Chunghwa Telecom Co., Ltd. reported two recent developments. Authorities from the Taiwan Taoyuan District Prosecutors Office, working with the Kaohsiung Investigation Branch of the Investigation Bureau of the Ministry of Justice, raided staff offices at the company’s local business operation centers on 2025/12/03; the company states there is no effect on its finances or business and that it fully cooperated with the investigation.

Separately, Chunghwa Telecom’s head office agreed to purchase renewable energy from GREENET CO., LTD. for 20 years, totaling at least 4.6 billion kWh of diversified green electricity. This long-term supply is intended to support goals of cutting carbon emissions by 50% and reaching 100% renewable energy usage in IDC data centers by 2030, meeting RE100 by 2040, and achieving net-zero emissions by 2045.

Insights

Telecom & ESG Strategy Analyst

Chunghwa pairs an office raid disclosure with a sizable long-term green power commitment.

The company notes that investigative authorities raided staff offices at its local business operation centers on 2025/12/03. Chunghwa Telecom explicitly states there is no effect on its finances or business and that it cooperated fully, so the immediate operational impact described is limited, though any further developments would depend on future official actions not detailed here.

The renewable energy agreement with GREENET CO., LTD. runs for 20 years and covers at least 4.6 billion kWh of diversified green electricity. This purchase is aligned with stated targets: a 50% reduction in carbon emissions and 100% renewable energy usage in IDC data centers by 2030, meeting RE100 by 2040, and reaching net-zero emissions by 2045. The disclosure also notes that this type of information is considered potentially significant for shareholder rights or the trading price under Article 7, subparagraph 9 of the Securities and Exchange Act Enforcement Rules.

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

1934 Act Registration No. 1-31731

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 OF

THE SECURITIES EXCHANGE ACT OF 1934

Dated December 8, 2025

Chunghwa Telecom Co., Ltd.

(Translation of Registrant’s Name into English)

21-3 Xinyi Road Sec. 1,

Taipei, Taiwan, 100 R.O.C.

(Address of Principal Executive Office)

(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 ☐

(Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.)

Yes ☐ No ☒

(If “Yes” is marked, indicated below the file number assigned to the registrant in connection with Rule 12g3-2(b): Not applicable)

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EXHIBIT INDEX

Exhibit		Description
99.1 99.2		Announcement on 2025/12/3: Announcement on 2025/12/5:	Taiwan Taoyuan District Prosecutors Office raided the staff offices of the local business operation centers of the Company Purchase of Renewable Energy from GREENET CO., LTD.

2

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant Chunghwa Telecom Co., Ltd. has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: December 8, 2025

Chunghwa Telecom Co., Ltd.

By: /s/ Wen-Hsin Hsu

Name: Wen-Hsin Hsu

Title: Chief Financial Officer

3

EXHIBIT 99.1

Taiwan Taoyuan District Prosecutors Office raided the staff offices of the local business operation centers of the Company

Date of events:2025/12/03

Contents:

1.Date of occurrence of the event:2025/12/03

2.Cause of occurrence: Taiwan Taoyuan District Prosecutors Office directed the Kaohsiung Investigation Branch of the Investigation Bureau, Ministry of Justice to raid the staff offices of the local business operation centers of the Company.

3.Countermeasures: the Company was in full cooperation with the investigation.

4.Effect on the Company's finances and business: None

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

4

EXHIBIT 99.2

Purchase of Renewable Energy from GREENET CO., LTD.

Date of events:2025/12/05

Contents:

1.Date of occurrence of the event: 2025/12/05

2.Company name: Chunghwa Telecom Co., Ltd.

3.Relationship to the Company (please enter "head office" or "subsidiaries"): Head office

4.Reciprocal shareholding ratios: N/A

5.Cause of occurrence: The Company aims to achieve the goals of reducing carbon emissions by 50% and ensuring 100% renewable energy usage in IDC data centers by 2030, as well as meeting RE100 by 2040 and reaching net-zero emissions by 2045.

6.Countermeasures: Purchase renewable energy from GREENET CO., LTD. for a period of 20 years, totaling at least 4.6 billion kWh of diversified green electricity.

7.Any other matters that need to be specified (the information disclosure also meets the requirements of Article 7, subparagraph 9 of the Securities and Exchange Act Enforcement Rules, which brings forth a significant impact on shareholders rights or the price of the securities on public companies.): None

5

FAQ

What did Chunghwa Telecom (CHT) disclose about the prosecutors office raid?

Chunghwa Telecom reported that the Taiwan Taoyuan District Prosecutors Office, through the Kaohsiung Investigation Branch of the Investigation Bureau, Ministry of Justice, raided staff offices at its local business operation centers on 2025/12/03. The company states there is no effect on its finances or business and that it fully cooperated with the investigation.

Does the office raid reported by Chunghwa Telecom affect its finances or operations?

According to the disclosure, Chunghwa Telecom indicates the raid has no effect on the company’s finances and business. It also notes that there are no additional matters that need to be specified regarding this event.

What renewable energy agreement did Chunghwa Telecom (CHT) enter into with GREENET CO., LTD.?

Chunghwa Telecom’s head office agreed to purchase renewable energy from GREENET CO., LTD. for a period of 20 years, totaling at least 4.6 billion kWh of diversified green electricity. This long-term commitment supports the company’s sustainability and emissions-reduction goals.

What climate and renewable energy targets has Chunghwa Telecom announced?

Chunghwa Telecom aims to reduce carbon emissions by 50% and ensure 100% renewable energy usage in IDC data centers by 2030, meet RE100 by 2040, and reach net-zero emissions by 2045. The renewable energy purchase from GREENET CO., LTD. is intended to help achieve these targets.

How large is Chunghwa Telecom’s renewable energy purchase in this disclosure?

The agreement with GREENET CO., LTD. covers at least 4.6 billion kWh of diversified green electricity over 20 years. The disclosure highlights this as information that may significantly impact shareholder rights or the price of the company’s securities under relevant enforcement rules.

Why does Chunghwa Telecom say the renewable energy deal may be significant for shareholders?

The company notes that the disclosure of the renewable energy purchase also meets the requirements of Article 7, subparagraph 9 of the Securities and Exchange Act Enforcement Rules, which addresses information that may have a significant impact on shareholder rights or the market price of a public company’s securities.