British manufacturer of industrial belting products, Fenner, rose to the top of the leaderboard after analysts at Citgroup reaffirmed a 'buy' rating for the stocks. The company said revenue and earnings were in line with its expectations in a trading update for the period from March 1st to July 17th.DCC advanced after the sales, marketing, distribution and business support services firm reported a strong start to the year with sales at its two-largest divisions, Energy and SerCom, ahead of budget. Jefferies reiterated a 'buy' rating for the stock.Chemring, a British-based producer of countermeasures defence sectors, was the biggest faller followed by online gambling company Rank Group. The latter was weighed down by reports US Senators had addressed problems on internet gaming, recommending tighter regulations.Fidelity China Special Situations and JPMorgan Emerging Markets Inv Trust retreated after a report highlighted that investors in UK funds are finding themselves paying up to 24% more in annual management charges than they need to.FTSE 250 - RisersFenner (FENR) 349.60p +4.33%DCC (DCC) 2,701.00p +3.84%Polymetal International (POLY) 603.50p +3.52%Supergroup (SGP) 1,029.00p +3.00%African Barrick Gold (ABG) 110.00p +3.00%Playtech (PTEC) 679.50p +2.95%Sports Direct International (SPD) 654.50p +2.59%Evraz (EVR) 104.80p +2.24%Ladbrokes (LAD) 206.30p +2.18%Bwin.party Digital Entertainment (BPTY) 130.40p +2.03%FTSE 250 - FallersChemring Group (CHG) 308.30p -3.99%Rank Group (RNK) 159.00p -2.09%Fidelity China Special Situations (FCSS) 87.90p -2.06%JPMorgan Emerging Markets Inv Trust (JMG) 573.00p -1.80%Catlin Group Ltd. (CGL) 522.00p -1.79%Domino Printing Sciences (DNO) 640.00p -1.77%Henderson Group (HGG) 169.60p -1.57%Computacenter (CCC) 504.50p -1.46%JPMorgan Indian Inv Trust (JII) 365.00p -1.35%Genesis Emerging Markets Fund Ltd. (GSS) 520.00p -1.33%RD