Nomura Holdings Inc. is reviewing the financial viability of Nomura Code Securities Ltd., the Japanese bank's U.K. brokerage specializing in health and clean-technology companies, said a person with knowledge of the matter. Nomura Code alerted the London Stock Exchange last month it had ceased making a market in U.K. stocks. The parent company is set to conclude a formal review of the unit's operations in a few weeks, said the person, who asked not to be identified because the process hasn't been made public. Sunny Tucker, a Nomura spokesman in London, declined to comment.