Stifel Begs to DifferTD Securities analyst Aaron Bilkoski downgraded Tourmaline Oil Corp. to “hold” from “buy” with an $80 target. Elsewhere, Stifel’s Robert Fitzmartyn raised his target to $90.50 from $87.25 with a “buy” rating, calling it a “growth stock at attractive valuation.” The average on the Street is $82.73.