Kangda International Environmental (HKG:6136) said the mandatory unconditional cash offer by Duan Chuan Liang and Sharp Profit Investments closed on Monday, according to a same-day Hong Kong bourse filing.
Shares of the water infrastructure builder fell nearly 4% in afternoon trade on Tuesday.
Sharp Profit is a wholly owned subsidiary of China Water Affairs Group (HKG:0855).
The joint offerors received valid acceptances for about 335.2 million shares, or 14.5% of Kangda's issued capital, and 44.2 million share options, representing 26.7% of those outstanding.
Together with existing holdings, Duan and Sharp Profit now control about 64.6% of Kangda's issued shares.
The company said its public float remains at 30.3%, meeting Hong Kong listing requirements.

