BUZZ-OneSavings Bank: Shares up after Investec rates co a "buy"
** Shares (Berlin: DI6.BE - news) in Britain's OneSavings Bank Plc (LSE: OSB.L - news) rise as much 5 pct as brokerage Investec (LSE: INVP.L - news) initiates "buy" rating on the stock, calling the bank unique within the "challenger" banks space
** Stock is top gainer on the FTSE-250 Midcap Index and the FTSE-350 Fin Serv Financial Index
** Shares in OneSavings, which was the first UK bank to list in a decade on the London Stock Exchange (Other OTC: LDNXF - news) last June, have risen about 80 pct from listing price of 170 p
** OneSavings stock touched market high of 328 p last month
** "The FTSE-100 banks offer a poor comparator group," Investec says in a note and sets target price on the stock at 365 p
** OneSavings focuses on specialist lending, including the market for buy-to-let mortgages, which are growing at a quick clip in Britain (aashika.jain.thomsonreuters.com@reuters.net)