** Oil and gas producer's shares rise as much as 12 pct to $2.90
** Company reported better-than-expected quarterly profit on Thursday, helped by a fall in costs
** First time BNP's profit has topped estimates in 4 quarters
** RBC raises rating on company's shares to "outperform" from "sector perform"
** 9 of 14 brokerages rate the stock "buy", with the remaining rating it "hold"
** Up to Thursday's close, stock had lost nearly half its value so far this year