A company whose shares are listed both on the Stock Exchange of Hong Kong (H shares) and on the Shanghai or Shenzhen Stock Exchange (A shares). Under Main Board Listing Rule 19A.04, 'H shares' means shares of a PRC issuer (excluding Hong Kong, Macau and Taiwan) that are listed on the Exchange and does not require an A-share listing; A+H shares are therefore a subset of H shares, and not every H share is an A+H share. This site's A+H list follows the preset 'AH shares' filter on the HKEX securities prices page. Basis: Main Board Listing Rule 19A.04.
The links above lead to official sources such as HKEX and the SFC. The explanation on this site summarises them and may differ from the official definition; the official documents prevail.
This page explains the HK IPO term "A+H Shares" and links to related terms. Definitions are compiled from HKEX Practice Note 18 and the Listing Rules, for understanding subscription rules only — not investment advice.