[1/2] A worker shelters from the rain under a Union Flag umbrella as he passes the London Stock Exchange in London, Britain, October 1, 2008. REUTERS/Toby Melville/File PhotoLONDON, March 3 (Reuters) - London risks losing its appeal for stock market listings, some investors and financial executives said, with sluggish trading and low valuations driving more companies to float elsewhere. That dashed government hopes that Arm, seen as a British tech success story, would return to the London market, where it was listed before being taken over in 2016. Arm's announcement came a day after Dublin-based construction materials company CRH recommended moving its primary listing from London to the United States. But British companies that floated in New York have not necessarily had the smooth ride they expected, data compiled by the London Stock Exchange (LSE) (LSEG.L) suggests.

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