Chunghwa Telecom (CHT) 6-K To announce the Standard & Poor maintains its ratings on Chunghwa ‘AA’ Long-term foreign currency corporate rating

EXHIBIT 99.1  

To announce the Standard & Poor maintains its ratings on Chunghwa ‘AA’ Long-term foreign currency corporate rating  

Date of events: 2015/12/18  

Contents:  

1. Date of occurrence of the event: 2015/12/18

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. Name of the reporting media: N.A.

6. Content of the report: N.A.

7. Cause of occurrence: Chunghwa Telecom Co., Ltd. (“CHT”, TAIEX: 2412, NYSE: CHT) announced that Standard & Poor’s Ratings Services affirmed its ‘AA’ long-term foreign currency corporate rating on the company. Taiwan Ratings Corp. also affirmed its ‘twAAA’ long-term corporate rating and ‘twA-1+’ short-term corporate credit rating on the company. Both Standard & Poor’s Ratings Services and Taiwan Ratings Corp. affirmed a stable outlook of the company.

8. Countermeasures: None.

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