March 5 (Reuters) - China's JD.com ( JD ) missed

market estimates for quarterly revenue on Thursday, in a sign

that stiff competition and waning benefits from government

subsidies were eating into demand at the e-commerce giant.

The company reported revenue of 352.3 billion yuan ($51.12

billion) in the fourth quarter ended December, compared with

analysts' average estimate of 353.86 billion yuan, according to

data compiled by LSEG.

($1 = 6.8918 Chinese yuan renminbi)