The Hong Kong group said in a stock market filing that it had a net gain of over HK$10 billion ($1.3 billion) last year from mergers and acquisition transactions.

"As one-off gains of similar magnitude may not materialise and, coupled with the numerous headwinds and externalities... its reported results in 2023 are expected to be affected," the filing said.

CK Hutchison said net profit last year rose to HK$36.7 billion, beating a SmartEstimate forecast of HK$33.5 billion, thanks to improvements in the ports division, steady performance of its infrastructure businesses and the one-off gain.

Sister company CK Asset, a major property developer in Hong Kong which also has interests in infrastructure and utility assets overseas, said net profit during the period gained 3.6% to HK$21.7 billion.

Analysts had forecast a HK$21.8 billion net profit, according to SmartEstimate.

Shares in CK Hutchison ended down 2.3% on Thursday ahead of the results, while CK Asset eased 1.9%. The Hang Seng Index dropped 1.7%.

($1 = 7.8488 Hong Kong dollars)

($1 = 7.8491 Hong Kong dollars)

(Reporting by Clare Jim; Editing by Emelia Sithole-Matarise)