Shanks is by far and away the standout stock in the mid-cap index after the waste management firm said it had received a 135p a share takeover approach from a private equity group.The approach - thought to have been made by the US group Carlyle - would be worth £536, but Shanks is holding out for a larger offer worth 150p a share.Elsewhere though, some stocks have taken hits including metals groups which are hit by lower metal prices.Ukraine-focused iron ore producer Ferrexpo, which was higher on Friday after it secured a new financing of $230m, falls back as does the platinum group Aquarius.FTSE 250 - RisersShanks Group (SKS) 126.90p +40.84%Dignity (DTY) 584.50p +2.36%Sports Direct International (SPD) 105.40p +2.13%Northgate (NTG) 247.00p +2.07%Hiscox (HSX) 317.00p +1.96%Northumbrian Water Group (NWG) 279.70p +1.45%Fidessa (FDSA) 1,120.00p +1.36%Melrose Resources (MRS) 316.60p +1.31%Bodycote (BOY) 170.00p +1.19%Robert Wiseman (RWD) 494.60p +1.17%FTSE 250 - FallersCSR (CSR) 378.70p -5.98%Aquarius Platinum Ltd. (AQP) 343.50p -4.82%Cookson Group (CKSN) 409.90p -4.07%SVG Capital (SVI) 130.00p -3.42%Ferrexpo (FXPO) 194.30p -3.19%Synergy Healthcare (SYR) 630.50p -3.15%BlueBay Asset Management (BBAY) 318.80p -3.13%Daejan Holdings (DJAN) 2,641.00p -3.05%Spirent Communications (SPT) 94.75p -2.92%Ashtead Group (AHT) 69.35p -2.80%