By Pete Najarian, co-founder of OptionMonsterNEW YORK -- Phillips 66 ( PSX) has been lighting up our scanners for months and the buyers came back for more Monday. OptionMonster's tracking systems showed heavy activity in the January 60 calls, with about 27,000 trading in volume well above the previous open interest of 3,841 contracts. The largest block priced for 70 cents. Calls lock in the price where traders can buy shares, so these options can provide significant leverage when the stock goes up. But if the shares don't move, the calls will expire worthless. Phillips 66 closed at $53.58 on Monday, up 2.37% on the session and 67% in the last six months. As the refiners keep rolling, the beta trade has focused like a laser on a few specific names like this one. Calls outnumbered puts by 46,000 to about 7,500, a reflection of Monday's bullish sentiment. Najarian owns PSX shares.