Emerald Energy is leading the risers after emerged Chinese state-run oil company Sinochem Resources has made a bid for the firm.Among the other main risers are housebuilders Taylor Wimpey and Barratt.Legacy software specialist Micro Focus has predicted a running twelve-month revenue contribution of $150m from recent acquisitions Compuware and Borland. But this has failed to impress investors and the shares are down 5%.FTSE 250 - RisersEmerald Energy (EEN) 736.50p +9.11%Taylor Wimpey (TW.) 39.00p +3.56%Fisher (James) & Sons (FSJ) 430.00p +3.37%SEGRO (SGRO) 316.80p +3.23%AG Barr (BAG) 1,336.00p +3.17%Barratt Developments (BDEV) 222.60p +2.72%Northern Foods (NFDS) 62.55p +2.54%Halma (HLMA) 197.50p +2.54%Rathbone Brothers (RAT) 787.50p +2.27%ITV (ITV) 45.96p +2.22%FTSE 250 - FallersGreene King (GNK) 428.80p -5.22%Micro Focus International Plc (MCRO) 379.50p -5.12%Northumbrian Water Group (NWG) 230.20p -4.48%Enterprise Inns (ETI) 155.60p -4.01%Ferrexpo (FXPO) 159.10p -3.93%Morgan Sindall (MGNS) 581.50p -3.88%Millennium & Copthorne Hotels (MLC) 317.50p -3.32%Hochschild Mining (HOC) 257.80p -3.26%Ashtead Group (AHT) 69.55p -3.13%FirstGroup (FGP) 349.70p -2.94%