双重上市，一般也指双重主要上市。是指两个资本市场都算第一上市地。已经在美国市场上市的情况下，在香港市场按当地市场规则发行上市，其须遵守的规则与在香港首次IPO的公司要求完全一致，两市场股票无法跨市场流通，股价表现相对独立，可能产生价差。双重上市的公司可以被纳入港股通名单，可以引入A股投资者，提升股票流动性，且也有利于日后回A股，实现“三地上市”。

据公开资料，目前采取双重主要上市方式回港的中概股公司仅有四家，分别来自汽车和医药行业。

其英文为（dual listing）或dual primary listing（双重主要上市）

A dual listing refers to a listing of any security on two or more different exchanges. Companies use dual listings because of their benefits, which include additional liquidity, increased access to capital, and the ability for their shares to trade for longer periods if the exchanges on which their shares are listed are in different time zones.

介绍上市是已发行证券申请上市的一种方式，不需要在上市时再发行新股，因为该类申请上市的证券已有相当数量，并为公众所持有，故可推断其在上市后会有足够的流通量。介绍形式上市在境外是常见的一种上市模式，截至2012年，中国国内还没有类似的模式。

其英文为by way of introduction。

Listing by introduction is a way of listing shares already in issue on another exchange. No marketing arrangement is required as the shares for which listing is sought are already widely held. The listing approval procedures for a new listing by introduction are the same as those for initial public offerings (IPO).

关于贝壳相关上市介绍的英文如下，供参考：

This is the first dual primary listing by way of introduction with WVR structure on the HKEX

Davis Polk advised the joint sponsors on Hong Kong and U.S. laws in connection with the dual primary listing of the Class A ordinary shares of KE Holdings Inc. (Beike) (NYSE: BEKE) by way of introduction on the Hong Kong Stock Exchange.

Beike is a leading integrated online and offline platform for housing transactions and services. It is a pioneer in building infrastructure and standards to reinvent how service providers and housing customers efficiently navigate and complete housing transactions in China, including existing and new home sales, home rentals, home renovation and furnishing and other services. In terms of gross transaction value in 2021, Beike is the largest housing transactions and services platform in China and a top three commerce platform across all industries globally.