By David Russell, reporter at OptionMonsterNEW YORK -- Waste Management ( WM) reports earnings next week, and the bulls jumped on board Thursday. OptionMONSTER's tracking systems detected the purchase of about 14,000 March 37 calls in volume that was well above the strike's previous open interest of just 3,323 contracts, indicating fresh buying. Premiums rose from 30 cents to 70 cents as the trades crossed, which shows a strong buying pattern. Calls lock in the price where investors can buy stock in the trash hauler, and their low cost can result in significant leverage on a percentage basis should WM make even a small move higher. But they'll also become worthless if it doesn't climb or declines. Shares of Waste Management rose 1.25% to $36.55 Thursday and are up 8% so far this year. Fourth-quarter results will be issued on Feb. 14. Total option volume was five times greater than average in the session, with calls outnumbering puts by 12 to 1. Russell has no positions in WM.