The law firms involved in an IPO, acting for the issuer (legal advisors to the company) and for the sponsors and underwriters (legal advisors to the sponsors/underwriters), advising on the applicable laws. The prospectus section on directors, supervisors and parties involved in the global offering lists the parties, and HKEX lists the identities of underwriters and of the legal advisers to underwriters among the items a listing document must disclose. Basis: HKEX Guide for New Listing Applicants, Chapter 6.4.
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 "Legal Advisors" 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.