HONG KONG, Feb 18 (Reuters) - The following are some of the major companies planning initial public offerings and new listings on the Hong Kong stock exchange. Please contact Elzio Barreto at elzio.barreto@thomsonreuters.com or (+852) 2843-1608 to submit entries for this diary. Click on the square bracket for the latest story. ** Denotes new entry or update ^ Information based on local media reports ++ Denotes Hong Kong offering for companies listed elsewhere ================