nasdaq listing, page-9

Willbio - this extract from a previous post of mine might help explain it a bit.

Brokers will buy or sell in the market that offers them the best price, and they can do so in three ways: by issuing a new Depositary Receipt, transferring an existing Depositary Receipt or canceling a Depositary Receipt. For example, if the price of the actual shares in the home market is $12.28 per share after allowing for foreign currency translation, and the Depositary Receipt is selling for $12.30, the broker will buy shares and issue Depositary Receipts until the price of the ordinary shares increases to $12.30, at which time the broker will simply buy and sell the existing Depositary Receipts that are outstanding in the market. The broker may also be holding an inventory of ordinary shares, in which case the local trading price is irrelevant.