[To announce the differences between ROC GAAP and US GAAP for 2011 financial statements Date of events: 2011/ 04 / 20 Contents: 1.Date of occurrence of the event:2012/04/20 2.Cause of occurrence: To announce the differences between ROC GAAP and US GAAP for 2011 financial statements. 3.Content of overseas financial report required to be adjusted due to inconsistency in the accounting] [Chunghwa Telecom holds investor conference call for the first quarter of 2012 operation results Date of events: 2011/ 04 / 23 Contents: 1.Date of the investor/press conference or the date that the Company disclose its financial or business information to the public:2012/04/30 2.Location of the investor/press conference or the location that the Company disclose its financial or business information to] [The Board approves to change the head of Mobile Business Group Date of events: 2011/ 04 / 27 Contents: 1.Date of occurrence of the event:2012/04/27 Chunghwa Telecom Co., Ltd. 3.Relationship to the Company (please enter “head office” or “affiliate company”):Head office 4.Reciprocal shareholding ratios: N/A 5.Cause of occurrence: The 15th meeting of the 6th term board of directors approves the] [Supplementary annou n cement regarding the board approves the Company’s Annual General Meeting 2012 Date of events: 2011/ 04 / 27 Contents: 1.Date of the board of directors resolution:2012/04/27 2.Date for convening the shareholders’ meeting:2012/06/22 3.Location for convening the shareholders’ meeting: Chunghwa Telecom Training Institute (No. 168, Minzu Road, Banchiao District, New Taipei City, Taiwan, R.O.C.) 4.Cause or subjects for] [To announce the differences between ROC GAAP and US GAAP for the first quarter of 2012 financial statements Date of events: 201 2 / 04 / 29 Contents: 1.Date of occurrence of the event:2012/04/29 2.Cause of occurrence: To announce the differences for the first quarter of 2012 financial statements between ROC GAAP and US GAAP. 3.Content of overseas financial report] [6 The To announce the possible financial impact of first adoption of IFRSs on the consolidated financial statements as of January 1, 2012 Date of events: 201 2 / 04 / 29 Contents: 1.Date of occurrence of the event:2012/04/27 Chunghwa Telecom Co., Ltd. 3.Relationship to the Company (please enter “head office” or “affiliate company”):Head office 4.Reciprocal shareholding ratios: N/A 5.Cause] [7 Chunghwa Telecom participates in an investors conference Date of events: 201 2 / 05 / 03 Contents: 1.Date of the investor conference:2012/05/08 2.Time of the investor conference:09:00 3.Location of the investor conference: Taipei 4.Brief information disclosed in the investor conference: The conference will be held by Citigroup Global Markets Taiwan Securities. 5.The presentation of the investor conference release: Please] [8 To announce the Company’s April 2012 revenues Date of events: 201 2 / 05 / 10 Contents: 1.Date of occurrence of the event:2012/05/10 3.Relationship to the Company (please enter “head office” or “affiliate company”):Head office 4.Reciprocal shareholding ratios: N/A 5.Cause of occurrence: Chunghwa Telecom today announced a 2.2% year-over-year decrease in unaudited unconsolidated total revenue to NT$15.7 billion in] [9 Chunghwa Telecom May 1 0 , 2012 This is to report the changes or status of 1) Sales volume 2) Funds lent to other parties 3) Endorsements and guarantees 4) Financial derivative transactions for the period of Apr 201 2 1) Sales volume (NT$ Thousand) Period Items 201 2 201 1 Changes % Apr Invoice amount 16,077,323 16,652,778 (-)575,455] [5 /1 1 Chunghwa Telecom Co., Ltd.]

[99.1 Supplementary a nnouncement regarding the Company’s annual general meeting on June 22 , 201 2 1.Date of the board of directors resolution:201 2 /0 4 /2 7 2.Date for convening the shareholders’ meeting:2012/06/22 3.Location for convening the shareholders’ meeting: Chunghwa Telecom Training Institute (No. 168, Minzu Road, Banchiao District, New Taipei City, Taiwan, R.O.C.) 4.Cause or subjects for convening] [5 / 02 Chunghwa Telecom Co., Ltd.]

[Impact on Chunghwa Telecom’s Financials after the adoption of IFRS As of January 1, 2012, the major differences in Chunghwa’s consolidated financials due to the transition from ROC GAAP to IFRS include a decrease of NT$18,050,922 thousand in retained earnings, an increase of NT$20,621,248 thousand in paid-in capital, a decrease of NT$5,762,753 thousand in unrealized revaluation increment, a decrease of] [Chunghwa Telecom Reports Consolidated Operating Results Taipei, Taiwan, R.O.C. April 30, 2012 - Chunghwa Telecom Co., Ltd. (TAIEX: 2412, NYSE: CHT) (“Chunghwa” or “the Company”) today reported its operating results for the first quarter of 2012. All figures were prepared in accordance with generally accepted accounting principles of the Republic of China (“ROC GAAP”) on a consolidated basis. (Comparisons, unless] [Chunghwa Telecom Co., Ltd. Financial Statements for the Three Months Ended March 31, 2012 and 2011 and Independent Accountants’ Review Report INDEPENDENT ACCOUNTANTS’ REVIEW REPORT The Board of Directors and Stockholders Chunghwa Telecom Co., Ltd. We have reviewed the accompanying balance sheets of Chunghwa Telecom Co., Ltd. as of March 31, 2012 and 2011 , and the related statements of] [Chunghwa Telecom Co., Ltd. and Subsidiaries Consolidated Financial Statements for the Three Months Ended March 31, 2012 and 2011 and Independent Accountants’ Review Report INDEPENDENT ACCOUNTANTS’ REVIEW REPORT To the Board of Directors and Stockholders of Chunghwa Telecom Co., Ltd. We have reviewed the accompanying consolidated balance sheets of Chunghwa Telecom Co., Ltd. and subsidiaries (“the Company”) as of March] [Chunghwa Telecom Co., Ltd. and GAAP Reconciliations of Consolidated Financial Statements for the Three Months Ended March 31, 2012 and 2011 1. 1) Net Income Reconciliation Three Months Ended March 31 2011 2012 NT$ NT$] [4 / 30 Chunghwa Telecom Co., Ltd.]