Online grocer Ocado was rebounding strongly after a heavy fall the previous day with analysts at Deutsche Bank providing a lift by upgrading the stock to 'hold'. The company underwhelmed the market with its interim results on Tuesday, but the bank said it now sees limited downside to its target price.Construction, services and property group Kier gained after reporting that its underlying trading performance for the year to June 30th "remains on course", while sector peer Carillion rose after saying it expects to start increasing revenue again this year following a weak first half.Tough construction markets have hit revenue at Carillion, but the support services and building group rose after it said orders are holding up and it expects to start increasing revenue again this year. Carillion confirmed first-half revenue in construction services other than the Middle East is expected to be lower than in the same period a year ago. Investec helped it higher after it upped its target price from 360p to 380p and upgraded its from 'hold' to 'buy'.Meanwhile, a host of stocks were trading lower today after going ex-dividend, including De La Rue, Cranswick, Dairy Crest, Homeserve and TalkTalk Telecom Group. FTSE 250 - RisersOcado Group (OCDO) 389.10p +9.61%CSR (CSR) 612.00p +4.26%Kier Group (KIE) 1,838.00p +3.08%National Express Group (NEX) 278.80p +3.03%Howden Joinery Group (HWDN) 325.90p +2.97%Beazley (BEZ) 260.10p +2.97%Petra Diamonds Ltd.(DI) (PDL) 197.00p +2.87%Carillion (CLLN) 341.40p +2.46%Computacenter (CCC) 624.50p +2.38%Dechra Pharmaceuticals (DPH) 750.00p +2.25%FTSE 250 - FallersDe La Rue (DLAR) 782.00p -3.46%Dairy Crest Group (DCG) 469.00p -2.90%Cranswick (CWK) 1,276.00p -2.52%Telecom Plus (TEP) 1,293.00p -2.42%Barr (A.G.) (BAG) 634.50p -2.38%Moneysupermarket.com Group (MONY) 185.90p -2.31%Homeserve (HSV) 311.20p -2.29%ITE Group (ITE) 238.30p -2.06%JD Sports Fashion (JD.) 404.00p -1.94%TalkTalk Telecom Group (TALK) 327.00p -1.83%NR