Specialist homewares retailer Dunelm is in demand after it grew market share in the first half of 2009 as like-for-like sales improved, despite a declining market.Sausages and pork products supplier Cranswick climbs after saying it has made a positive start to its new financial year, with first quarter sales up across most parts of the business.Today's best performer is Emerald Energy, which has received an approach that could lead to a bid for the London-listed mid-cap oil explorer.FTSE 250 - RisersEmerald Energy (EEN) 623.50p +11.24%Dunelm (DNLM) 222.00p +5.59%Venture Production (VPC) 824.00p +4.97%Moneysupermarket.com (MONY) 49.00p +4.81%SEGRO (SGRO) 24.00p +4.35%Cranswick (CWK) 627.00p +3.89%Novae Group (NVA) 302.50p +3.24%National Express Group (NEX) 272.50p +2.93%Genus (GNS) 509.00p +2.41%ITV (ITV) 32.75p +2.34%FTSE 250 - FallersFerrexpo (FXPO) 112.75p -4.85%Peter Hambro Mining (POG) 518.00p -4.69%Sports Direct International (SPD) 76.50p -4.67%IMI (IMI) 276.25p -4.66%Debenhams (DEB) 80.75p -4.44%Marston's (MARS) 83.00p -4.32%Morgan Crucible (MGCR) 84.25p -3.99%SDL International (SDL) 306.00p -3.92%Salamander Energy (SMDR) 164.25p -3.38%SVG Capital (SVI) 100.50p -3.37%