Can public property companies in Hong Kong be invested by enterprises, but not in Chinese mainland?

No, Hong Kong's commercial law inherits the British tradition and is capitalist. The mainland can also buy shares, such as water companies, but only on the surface. The state should hold 5 1% of the shares, and private individuals or companies can only hold 49% at most. There's something fishy here, too Foreign capital can only account for 49% of the shares. If a foreigner is invited to hold part of the shares, in fact, the proportion of the state is very low, and the bottom line of the state cannot be lower than 40%, otherwise the local government can't make a difference.