Lamprell is among the best performers after the oil rig services firm confirmed rumours yesterday that it is in talks to acquire Norwegian peer Maritime Industrial Services. Irish mining firm Kenmare Resources is being boosted higher by the rising commodity prices.While it has come off its lows for the day, gaming firm bwin.party is still under the weather after yesterday's German regulation reports. The authorities have proposd to licence betting from 2012, taxing turnover by 17%, prompting broker UBS to downgrade the group from 'neutral' to 'sell', predicting further weakness in the shares.Fund manager Henderson is edging higher, helped by Peel Hunt who upgraded its forecasts following the completion of the Gartmore acquisition. A 'hold' rating is kept by the target price is upped to 165p, from 145p.Student accommodation firm Unite Group is lower despite seeing an increase in the net asset value of its UNITE UK Student Accommodation Fund (USAF) in the first quarter of 2011. Property firm Great Portland Estates is slightly higher. Panmure Gordon has provided a lift after nudging up its target price from 360p to 368p.---bcFTSE 250 - RisersKenmare Resources (KMR) 48.60p +6.81%Lamprell (LAM) 364.10p +6.81%Pace (PIC) 161.10p +4.47%Renishaw (RSW) 1,649.00p +4.30%Sports Direct International (SPD) 190.90p +4.20%Premier Foods (PFD) 31.05p +4.02%Elementis (ELM) 164.70p +3.98%Hochschild Mining (HOC) 647.00p +3.94%African Barrick Gold (ABG) 563.00p +3.40%Rathbone Brothers (RAT) 1,190.00p +3.03%FTSE 250 - FallersBwin.party Digital Entertainment (BPTY) 138.50p -2.46%easyJet (EZJ) 327.40p -1.68%Moneysupermarket.com Group (MONY) 86.50p -1.54%FirstGroup (FGP) 315.70p -1.53%Bovis Homes Group (BVS) 425.20p -1.39%Unite Group (UTG) 211.00p -1.36%JPMorgan Asian Inv Trust (JAI) 238.10p -1.16%Hays (HAS) 113.00p -0.96%Exillon Energy (EXI) 454.40p -0.96%Michael Page International (MPI) 517.00p -0.86%