Renishaw is bucking the general downward trend. Improving activity levels and order book has put the precision tool maker on course to top last year's annual revenue figure and for profits to be "significantly" higher than expectations.Computacenter is another good gainer. The IT services provider grew revenues by 8% in the first three months of the year and has seen similar growth rates during the second quarter, led by a strong rebound in the UK.Shares in construction site ground preparation specialist Keller have moved slightly higher after a slump yesterday when it warned problems in the US would hit its results hard this year.But Trinity Mirror continues its descent. The newspaper publisher said yesterday that trading remained volatile in the period up to May 2, a factor that was exacerbated in the run up to the General Election.FTSE 250 - RisersRenishaw (RSW) 713.00p +4.47%Hikma Pharmaceuticals (HIK) 710.50p +2.23%BSS Group (BTSM) 324.60p +1.44%Keller Group (KLR) 639.50p +1.19%BBA Aviation (BBA) 207.40p +1.17%Rank Group (RNK) 119.70p +1.10%Ecofin Water & Power Opportunities (ECWO) 141.50p +1.07%Computacenter (CCC) 336.40p +0.78%Fidessa (FDSA) 1,394.00p +0.65%SThree (STHR) 361.30p +0.47%FTSE 250 - FallersTrinity Mirror (TNI) 112.50p -7.41%Inchcape (INCH) 32.32p -7.13%Lamprell (LAM) 227.70p -5.16%Cookson Group (CKSN) 531.50p -5.00%Brown (N.) Group (BWNG) 265.20p -4.84%Ferrexpo (FXPO) 292.30p -4.79%Enterprise Inns (ETI) 130.50p -4.61%Ashtead Group (AHT) 115.30p -4.32%SIG (SHI) 122.40p -4.08%UK Commercial Property Trust (UKCM) 80.50p -4.00%