會計師公會authorize 既cpa firm

List of CPA Practices could only be found in this web-site.
http://www.hkicpa.org.hk/membership/list/cpa/index.php
Every year, this list has to be published in the Government Gazette under the Professional Accountants Ordinance. this is another source.

http://www.hkicpa.org.hk/membership/registrationmatters/registration/adm_req.php