Telecoms group COLT was leading the risers on the second-tier index after a bolt-on acquisition of a UK cloud computing specialist, beefing up its presence in the small to medium enterprises (SME) market.Colt has completed the purchase of Fidelity Telecom Limited, a privately-owned company which trades under the ThinkGrid name. Sector peers TalkTalk and Cable & Wireless Communications were also performing well on Monday afternoon.Outsourcing and energy services group MITIE was among the fallers despite saying it has made a 'good start' to its financial year with 87% of budgeted revenues for the year having already been secured. ??Recruitment firm Michael Page fell after its profits took a tumble as market conditions worsened in the second quarter; things are not looking much brighter for the second half of the 2012 either. ??FTSE 250 - RisersCOLT Group SA (COLT) 119.70p +4.18%TUI Travel (TT.) 205.60p +3.58%TalkTalk Telecom Group (TALK) 185.90p +3.39%Cable & Wireless Communications (CWC) 33.56p +3.13%Heritage Oil (HOIL) 162.30p +2.85%Daejan Holdings (DJAN) 3,147.00p +2.44%Home Retail Group (HOME) 85.00p +2.35%Dixons Retail (DXNS) 16.57p +1.84%Centamin (DI) (CEY) 68.80p +1.78%Renishaw (RSW) 1,532.00p +1.73%FTSE 250 - FallersPetra Diamonds Ltd.(DI) (PDL) 98.70p -3.71%Mitie Group (MTO) 277.10p -3.04%Hunting (HTG) 780.00p -2.92%IP Group (IPO) 137.80p -2.82%Ophir Energy (OPHR) 505.00p -2.79%Cookson Group (CKSN) 584.50p -2.42%AZ Electronic Materials SA (DI) (AZEM) 307.80p -2.13%Drax Group (DRX) 474.00p -2.13%Mondi (MNDI) 563.50p -2.09%Michael Page International (MPI) 371.50p -1.98%BC