Secondary-market trades of HKEX-listed securities are subject to stamp duty of 0.1% of the transaction value (rounded up to the nearest dollar), payable by both buyer and seller. The rate applies to trades after listing; the five elements HKEX lists for IPO application payments do not include stamp duty. Basis: HKEX transaction fees page.
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 "Stamp Duty" 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.