Regus, the serviced office specialist, soared on Monday despite reporting a substantial fall in profits in 2010. Pre-tax profit dropped from £86.9m to £7.8m, but chief executive Mark Dixon did give an upbeat outlook on trading in 2011. "Arguably the recession of the last two years has been good for our business; it made us take a long hard look at everything we did, improve it and in doing so we have been transformed," he said.Gem Diamonds is wanted after confirming press speculation that it is in preliminary merger talks with TSX Venture Exchange-listed miner Lucara Diamond.Fund manager Jupiter is among the fallers despite receiving a 'buy' rating from RBS. The group announced on Friday that pre-tax profit jumped from £7.2m in 2009 to £42.4m in 2010.Also defying recommendations are investors of light commercial vehicle hirer Northgate. The group is heading higher even though UBS kept its 'sell' rating on the stock. FTSE 250 - RisersRegus (RGU) 115.90p +15.32%Redrow (RDW) 125.90p +6.33%Centamin Egypt Ltd. (CEY) 130.00p +5.43%Kenmare Resources (KMR) 40.00p +5.21%Punch Taverns (PUB) 72.45p +5.08%EnQuest (ENQ) 158.60p +5.03%Gem Diamonds Ltd. (DI) (GEMD) 283.30p +4.93%Northgate (NTG) 308.50p +4.84%Halma (HLMA) 344.70p +4.45%Cable & Wireless Communications (CWC) 50.45p +4.43%FTSE 250 - FallersExillon Energy (EXI) 379.50p -3.92%CPP Group (CPP) 293.10p -3.55%Jupiter Fund Management (JUP) 288.90p -3.05%Heritage Oil (HOIL) 311.80p -2.20%Carpetright (CPR) 717.00p -2.18%De La Rue (DLAR) 800.00p -1.84%Cranswick (CWK) 822.00p -1.79%Dignity (DTY) 702.00p -1.68%Hansteen Holdings (HSTN) 86.85p -1.31%Keller Group (KLR) 622.50p -1.27%