This;

Advantages to Investors / Shareholders

As mentioned earlier, the major advantage is that the shareholders can buy and sell shares of both the companies on bourses in the two countries. That means, when a company’s securities are listed on more than one exchange for the purpose of adding liquidity to the shares and allowing investors greater choice in where they can trade their shares. It contributes to the liquidity of the shares listed. This enables investors to have a greater choice as to where and when they can trade their shares. A significant apparent advantage of a dual-listed structure for companies is the benefit of scale and access to foreign capital.

It is not a widely used technique, although it is thought to improve the spread between the ‘bid and ask’ price which helps investors obtain a better price for their securities.

From the shareholders’ perspective they can buy and sell shares of both the companies on the stock exchanges in the two countries.

A structure would also remove the time-consuming requirement for the companies to take regulatory approvals from the various countries in which they operate should they go in for a conventional merger.

Taken from this;

http://www.financialnewsline.com/finance/dual-listing-cross-listing-dual-listing-definition/