CST : NOTICE OF AVAILABILITY - CIRCULAR - PROPOSALS INVOLVING GENERAL MANDATES TO ISSUE SHARES AND TO REPURCHASE SHARES, RE-ELECTION OF DIRECTORS AND NOTICE OF ANNUAL GENERAL MEETING

(Incorporated in the Cayman Islands with limited liability)

(Stock Code: 985)

To: The Shareholders who have chosen/deemed consent to read Corporate Communications of the Company published on its website in lieu of receiving printed copies

25 August 2020

Dear Sir or Madam,

Notice of availability - Circular - Proposals Involving General Mandates to Issue Shares and to Repurchase Shares, Re-election of Directors and Notice of Annual General Meeting

Circular - Proposals Involving General Mandates to Issue Shares and to Repurchase Shares, Re-election of Directors and Notice of Annual General Meeting of CST Group Limited (the "Company") (the "Current Corporate Communications") is now available (in English and Chinese versions) on the website of the Company at www.cstgrouphk.com. You may access the Current Corporate Communications by clicking the relevant subject as appeared on the website of the Company.

Pursuant to Rule 2.07A(3) of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited, shareholders of the Company ("Shareholder(s)") have the right at any time by reasonable notice in writing to the Company c/o its Hong Kong branch share registrar, Tricor Tengis Limited (the "Share Registrar") at Level 54, Hopewell Centre, 183 Queen's Road East, Hong Kong to change the choice of means and/or language of receipt of future Corporate Communications(Note) of the Company. Where a Shareholder has chosen to receive all future Corporate Communications by electronic means, and if for any reason that Shareholder has difficulty in receiving or gaining access to the website version of the Corporate Communications, the Company will promptly upon the request of that Shareholder send the Corporate Communications at the risk of that Shareholder in printed form free of change. If Shareholders have any queries in relation to this letter, on how to obtain printed copy of Current Corporate Communications on the Company's website, please call the enquiry hotline of the Share Registrar on

1. 2980 1333 during business hours from 9:00 a.m. to 4:30 p.m. Monday to Friday, excluding Hong Kong public holidays.

Yours faithfully,

For and on behalf of

CST Group Limited

Chiu Tao

Executive Director and Chairman

Note:

"Corporate Communications" refers to any document issued or to be issued by the Company for information or action of holders of securities of the Company, including but not limited to annual report, interim report, notice of meeting, listing document, circular and proxy form.