Wireless technology and computer chip company CSR powered to a 52-week high as it announced the sale of its handset connectivity technology business to Korean technology giant Samsung, paving the way for the return of a pile of cash to shareholders. CSR plans to return up to $285m to shareholders after sealing a deal with Samsung which will see the transfer to the Korean firm of CSR's phone handset operations for a consideration of $310m in cash. ?? BTG, the specialist healthcare company, rose after increasing its revenue estimate for the year ended March 31st 2013 after receiving a final royalty payment from Pfizer in relation to the BeneFIX product. ??European IT services provider Computacenter was in demand after saying it continues to trade in line with company expectations and the outlook for the full year to December 31st remains intact. Shares in Essar Energy, the India-focused integrated energy company, fell more than two per cent on Tuesday after the Supreme Court of India ordered it to pay 182m dollars to the government of Gujarat by July 30th in relation to its deferred sales tax liability. FTSE 250 - RisersCSR (CSR) 291.60p +33.58%Salamander Energy (SMDR) 195.50p +3.66%Computacenter (CCC) 321.00p +3.12%Premier Oil (PMO) 372.90p +3.07%Cranswick (CWK) 835.00p +2.20%Genus (GNS) 1,338.00p +2.14%Bumi (BUMI) 311.40p +1.83%Menzies(John) (MNZS) 622.50p +1.72%Marston's (MARS) 107.90p +1.70%International Personal Finance (IPF) 252.00p +1.41%FTSE 250 - FallersHome Retail Group (HOME) 75.40p -6.22%Perform Group (PER) 380.10p -6.15%Drax Group (DRX) 542.00p -5.41%Spirent Communications (SPT) 155.80p -5.00%Ocado Group (OCDO) 69.00p -4.23%Morgan Crucible Co (MGCR) 268.50p -4.00%Petra Diamonds Ltd.(DI) (PDL) 123.40p -3.74%Avocet Mining (AVM) 67.70p -3.63%Talvivaara Mining Company (TALV) 131.60p -3.38%Ruspetro (RPO) 128.70p -3.38%NR