Soco International beat its own 2013 oil and gas production volume guidance, pumping just shy of 17,000 barrels of hydrocarbons per day.Revenues fell 2.2% to $608.1m, with earnings before interest, tax, depreciation, amortisation and a non-cash $92m exploration write-off down 4.7% to $472.9m. Canaccord Genuity cut its stance from 'hold' to 'sell', saying the valuation is 'challenging' given that the shares trade at a hefty premium to the sector.Devro fell in the wake of N+1 Singer´s decision to cut its target price from 285p to 246p and reiterated its 'sell' recommendation.Playtech also moved lower after the group announced that Brickington Trading, which on Tuesday said it planned to sell around 29.3m shares in the group via an accelerated book build, had increased this to 45m on the back of "overwhelming demand from existing and new investors". Negotiations over mining strikes in South Africa have broken down between Lonmin and Anglo American's Anglo American Platinum (Amplats) and the Association of Mineworkers and Construction Union (AMCU), pushing Lonmin shares firmly into the red.Housebuilders were also among the worst performers after Credit Suisse lowered the sector from 'overweight' to 'market weight', recommending investors to take profits. The bank cut ratings for Barratt Developments, Bellway, Taylor Wimpey from 'outperform' to 'neutral', causing share prices to drop.Meanwhile, Perform was higher following its full-year results yesterday after Numis upgraded the group from 'add' to 'buy' with a target price of 347p.Colt Group was also a strong riser after BNP Paribas reiterated its 'outperform' rating on the stock. African Barrick Gold climbed after Nomura raised its target price from 270p to 350p, keeping its 'buy' recommendation.Pace shares were driven higher by JP Morgan, which increased its target price from 380p to 437p and maintained an 'overweight' rating. Numis also raised its target price from 340p to 420p.Irish builders merchants and DIY group Grafton was also in positive territory after it ramped up full-year profit and its dividend payment as trading conditions improved in the UK and Ireland. The group said it is confident of building on its strong performance into 2014.FTSE 250 - RisersPerform Group (PER) 300.00p +8.30%COLT Group SA (COLT) 139.00p +5.30%African Barrick Gold (ABG) 300.10p +4.93%Pace (PIC) 466.60p +4.24%Imagination Technologies Group (IMG) 190.00p +4.05%Grafton Group Units (GFTU) 690.00p +3.22%Greencore Group (GNC) 286.90p +3.20%KCOM Group (KCOM) 100.50p +3.13%Henderson Group (HGG) 246.10p +2.97%esure Group (ESUR) 265.00p +2.91%FTSE 250 - FallersSoco International (SIA) 407.80p -12.24%Devro (DVO) 252.00p -9.03%Playtech (PTEC) 741.50p -8.91%Jupiter Fund Management (JUP) 406.00p -5.30%Vesuvius (VSVS) 436.60p -5.07%Carphone Warehouse Group (CPW) 337.60p -3.16%Taylor Wimpey (TW.) 120.60p -3.13%Lonmin (LMI) 292.00p -3.02%BlackRock World Mining Trust (BRWM) 489.90p -2.70%Bellway (BWY) 1,644.00p -2.66%NR