0841 GMT [Dow Jones] Collins Stewart upgrades BP (BP.LN) to buy from hold. Says the setting up of a $20B claims response fund and the cancelling of the dividend have clarified two of the most important issues which have been overhanging the shares. Adds some investors may prefer not to hold BP at all for the next several months because of environmental concerns or social conscience issues, and Collins Stewart says it fully acknowledges that the risks on the stock remain high. "Nevertheless, we think the balance of risk and reward has shifted enough to upgrade the stock to buy," it adds. Has 450p target price. Shares +8% at 365p. (ishaq.siddiqi@dowjones.com) Contact us in London. +44-20-7842-9464 Markettalk.eu@dowjones.com (END) Dow Jones Newswires June 17, 2010 04:41 ET (08:41 GMT)