Interdealer broker Tullett Prebon led the FTSE 250 race Thursday as investors shrugged off the company's four per cent decline in revenue for the first four months of the year. Shareholders seemed to pay closer attention to the group's announcement that it had finalised the terms of a participation agreement under which a minimum of 12 leading banks will supply electronic streaming liquidity for euro interest rate derivatives through tpSWAPDEAL, the company's interest rate swap platform.Anite nipped at Tullett's heels as its shares surged after announcing it was on track for full-year profits to meet the top end of market forecasts. The software company said strong trading in the final quarter would help drive profits.On the negative end of the ladder, broadband and phone company TalkTalk Telecom Group, and manufacturer of polymer, Victrex, were the biggest fallers of the day. UK lender Provident Financial's shares also slid as analysts at Zachs upgraded the stock from 'neutral' to 'outperform'.FTSE 250 - RisersTullett Prebon (TLPR) 267.10p +6.25%Anite (AIE) 128.50p +5.76%Morgan Advance Materials (MGAM) 269.80p +4.17%Imagination Technologies Group (IMG) 307.20p +3.78%Spirent Communications (SPT) 137.90p +3.53%Smith (DS) (SMDS) 248.00p +3.29%RPS Group (RPS) 232.60p +3.29%Keller Group (KLR) 878.00p +3.23%Investec (INVP) 496.60p +2.94%Taylor Wimpey (TW.) 93.95p +2.90%FTSE 250 - FallersTalkTalk Telecom Group (TALK) 225.00p -10.89%Victrex (VCT) 1,561.00p -6.08%Provident Financial (PFG) 1,581.00p -6.06%Ocado Group (OCDO) 203.20p -3.24%Heritage Oil (HOIL) 131.50p -3.17%Savills (SVS) 585.00p -2.74%Kazakhmys (KAZ) 366.30p -2.48%Galliford Try (GFRD) 949.50p -2.11%Enterprise Inns (ETI) 97.95p -2.05%CSR (CSR) 531.00p -1.94%RD