Vodafone Group was the top riser on the FTSE 100 after confirming it was in talks with Verizon Communications to sell its stake in their Verizon Wireless venture.Melrose Industries surged after the engineering turnaround specialist revealed revenue more than doubled in the first half, boosted by its acquisition of Elster.WPP edged gained after the advertising company said first-half sales increased 7.1%, driven by strong performance in the UK and North America.Serco Group was the biggest faller after confirming that the UK Ministry of Justice has called police over the misreporting of data by "a small number of employees" associated with Serco's Prisoner Escort and Custody Services contract.Motor insurance company Admiral Group retreated despite reporting a rise in first half earnings that exceeded forecasts.Randgold Resources slumped as the price of gold fell for the first time in six days. FTSE 100 - RisersVodafone Group (VOD) 205.95p +8.80%Melrose Industries (MRO) 304.60p +7.10%WPP (WPP) 1,233.00p +4.67%Petrofac Ltd. (PFC) 1,434.00p +4.29%GKN (GKN) 334.30p +3.15%Whitbread (WTB) 3,143.00p +2.38%BT Group (BT.A) 329.90p +2.14%Rolls-Royce Holdings (RR.) 1,114.00p +2.01%InterContinental Hotels Group (IHG) 1,823.00p +1.96%Travis Perkins (TPK) 1,588.00p +1.86%FTSE 100 - FallersSerco Group (SRP) 538.00p -11.29%Admiral Group (ADM) 1,256.00p -2.64%Randgold Resources Ltd. (RRS) 5,065.00p -2.50%Pearson (PSON) 1,284.00p -2.43%Antofagasta (ANTO) 857.50p -1.94%Fresnillo (FRES) 1,263.00p -1.94%Vedanta Resources (VED) 1,190.00p -1.57%BG Group (BG.) 1,248.00p -1.54%Anglo American (AAL) 1,510.50p -1.31%Amec (AMEC) 1,050.00p -1.13%RD