** Shares of British online auction operator Auction Technology Group ATG.L down 8.7% at 282 pence
** Stock among top losers in the FTSE Small-Cap Index .FTSC, which is down 0.3%
** Co's biggest shareholder, FitzWalter Capital, says it will not make a new takeover bid for Auction Technology
** ATG rejected a 491-million-pound ($671.20 million) proposal from FitzWalter in January
** ATG has fallen ~53% in the last 12 months
(Reporting by Nithyashree R B in Bengaluru)
((NithyashreeRB@thomsonreuters.com))