By David Russell, reporter at OptionMonsterNEW YORK ( OptionMonster) -- The bulls stepped into Cimarex ( XEC) late in Friday's session. The independent oil and gas company's stock is trying to break above its 50-day moving average following a downtrend that has erased half its value between April and earlier this month. OptionMonster's real-time systems detected the purchase of more than 2,300 November 70 calls on Friday, with the largest blocks pricing for $1.23 to $1.40. Almost all the transactions occurred in the last 90 minutes of trading. Cimarex's stock closed the session up 2.84% to $64.06, and the shares are up 15% so far in October. Those calls give the investor the right to buy shares for $70 in the next four weeks and will appreciate rapidly if the stock rallies. If it remains little-changed or fails, however, they will expire worthless. The company will report earnings before the bell on Nov. 3. Overall option volume was six times greater than average in Friday's session, with calls outnumbering puts by seven to one. Russell has no positions in XEC.