Carson Yeung's takeover of Birmingham was rubber-stamped by the stock exchange on Wednesday after shares in Birmingham City Plc were delisted.
The move is a formality confirming the club's status as a private business.
A statement from the City read: "In line with the notification of the company's delisting that was made on 14th October 2009, as of 7.00am today, the company is delisted so that its shares are no longer admitted to trading on AIM."
The statement also confirmed Yeung, Vico Hui and Michael Wiseman as the sole directors of the company and club boards.
Birmingham have lost just once in the Premier League since Yeung completed his takeover of the club at the start of October.