Homeserve, the troubled emergency home repairs company, jumped despite denying it is in talks about a possible takeover. Shares were up nearly 13 per cent by mid-afternoon. RPC Group, a supplier of rigid plastic packaging, also rose after it generated first-quarter revenue on a similar level with that seen last year, boosted by growth in higher added value products.Wireless technology and computer chip company CSR was in the red, pulling back after gaining over 30% the day before as it announced the sale of its handset connectivity technology business to Samsung. UBS downgraded the stock from 'buy' to 'neutral' this morning. Telecom Plus, which supplies a wide range of utility services, took a hit despite saying it has said that half-yearly results will be firmly ahead of the corresponding figures for last year, and it remains on target to meet market expectations for the full year. FTSE 250 - RisersHomeserve (HSV) 188.20p +12.69%Ruspetro (RPO) 139.40p +7.23%Kenmare Resources (KMR) 33.48p +6.05%Yule Catto & Co (YULC) 137.30p +5.21%Hays (HAS) 69.85p +5.20%Elementis (ELM) 187.90p +4.97%Imagination Technologies Group (IMG) 460.20p +3.77%Booker Group (BOK) 89.00p +3.19%Ashtead Group (AHT) 263.30p +2.61%RPS Group (RPS) 215.10p +2.53%FTSE 250 - FallersTalvivaara Mining Company (TALV) 126.60p -3.43%Morgan Crucible Co (MGCR) 260.00p -3.42%Perform Group (PER) 350.90p -3.07%Melrose (MRO) 218.50p -2.89%Hochschild Mining (HOC) 426.90p -2.82%Gem Diamonds Ltd. (DI) (GEMD) 211.00p -2.68%Petropavlovsk (POG) 417.50p -2.57%CSR (CSR) 285.40p -2.26%Essar Energy (ESSR) 112.90p -1.91%Telecom Plus (TEP) 853.50p -1.90%NR