MGM China is a unit of U.S. casino operator MGM Resorts International. The new facility will be MGM Resorts' second in Macau.
At one point on Wednesday, the company's stock price was down 3.17%, or 0.48 Hong Kong dollars, from Tuesday at HK$14.66.
The opening of the MGM Cotai -- an integrated casino, hotel and entertainment complex -- will be delayed from the second quarter of 2017 to the second half of the year. The company cited the complexity of the facility's design and current market conditions.
The MGM Cotai was originally scheduled to open in 2016.