Shares in Exillon Energy started the week on the front foot after test well results in the West Siberia basin kept up the oil producer's 100% drilling success rate since 2006.Defence firm Cobham has bought US surveillance technology company Corp Ten International. Cobham is paying $11.5m to acquire the company on a debt and cash free basis, with an additional consideration of up to $12.5m due between 2012 and 2014 depending on Corp Ten's performance.Housebuilder Bellway has been encouraged by the pick up in site visits and reservations in 2011 following the cold snap in December. The group said it sold 2,332 homes in the six months to end-January, an increase of 85 on the corresponding period a year earlier.Water group Pennon's subsidiary Viridor Waste Management has acquired a materials recycling company based in Somerset, sending Pennon into the blue. Viridor is acquiring Martock Waste Paper from the owners on a debt free basis for £7.4m in cash.Property developer St Modwen Properties is unwanted despite announcing its confidence about the future after making an annual profit for the first time since 2007. The company posted a profit before tax of £37.5m for the 12 months to 30 November compared with a £119.4m loss in 2009 and £73.1m deficit the year before that.FTSE 250 - RisersBodycote (BOY) 305.30p +6.12%Keller Group (KLR) 659.50p +4.68%Exillon Energy (EXI) 389.80p +4.56%Rightmove (RMV) 886.00p +4.05%Logica (LOG) 143.30p +3.92%Cobham (COB) 216.30p +3.64%Hikma Pharmaceuticals (HIK) 851.50p +3.53%Meggitt (MGGT) 360.90p +3.50%De La Rue (DLAR) 708.00p +3.36%Dixons Retail (DXNS) 21.71p +3.33%FTSE 250 - FallersEnQuest (ENQ) 145.40p -3.07%Unite Group (UTG) 199.50p -2.68%Mcbride (MCB) 145.10p -2.49%ITV (ITV) 82.40p -1.96%St. Modwen Properties (SMP) 166.30p -1.71%Hiscox Ltd. (HSX) 376.30p -1.49%Kier Group (KIE) 1,289.00p -1.45%TalkTalk Telecom Group (TALK) 156.80p -1.38%Fidelity China Special Situations (FCSS) 110.20p -1.34%Forth Ports (FPT) 1,332.00p -1.26%