SIG is one of the top risers even after the building products group posted a sharp fall in profits as weakness in the construction market persisted into the first half of 2009.On the positive side, the firm said the new build housing segment had shown some modest signs of stabilising.Wellstream, pipeline products maker for the oil and gas industry, slips back after it saw half-year profits slide and revised its short term expectations as the timing of awards for production slows.Bus and rail operators Arriva and Stagecoach fall back after the Office for Fair Trading (OFT) said it is proposing to refer the local bus industry to the Competition Commission (CC) after finding evidence that limited competition could be leading to higher prices for bus users.FTSE 250 - RisersTaylor Wimpey (TW.) 45.58p +6.74%Barratt Developments (BDEV) 234.50p +6.54%SIG (SHI) 132.90p +6.41%Morgan Crucible (MGCR) 143.60p +5.98%Novae Group (NVA) 301.00p +5.61%Aquarius Platinum Ltd. (AQP) 274.10p +5.46%Michael Page International (MPI) 325.20p +4.90%Premier Oil (PMO) 1,367.00p +4.83%Burberry Group (BRBY) 482.90p +4.68%Forth Ports (FPT) 1,299.00p +4.59%FTSE 250 - FallersWellstream Holdings (WSM) 484.70p -9.74%DS Smith (SMDS) 85.25p -5.33%Stagecoach Group (SGC) 138.50p -4.68%PV Crystalox Solar (PVCS) 83.20p -3.20%Arriva (ARI) 457.10p -2.93%Drax Group (DRX) 463.90p -2.87%Game Group (GMG) 155.20p -2.08%Euromoney Institutional Investor (ERM) 252.00p -1.95%Kier Group (KIE) 968.00p -1.58%SEGRO (SGRO) 339.20p -1.42%