Kunlun Energy will become the 50th component of Hong Kong benchmark, Hang Seng Index, with effect from Dec 10, the index manager said in a statement after markets closed on Friday.

Mainland auto maker Great Wall Motor Co Ltd will replace rival BYD Co Ltd, backed by Warren Buffett, as a component stock on the China Enterprises Index of the top mainland listings in Hong Kong.

These changes were part of the index manager's quarterly review.