ST. PETERS, Mo. ( TheStreet) -- Traders are snapping up calls in MEMC Electronic Materials ( WFR). Some of the option activity Monday involved traders rolling upside positions to later months and higher strikes, but it was the naked call-buying that drew the most attention on OptionMonster's proprietary tracking systems despite no apparent news. The May 18 calls are well over $3 out of the money, but 8,762 of them changed hands Monday at nearly 14 times the open interest of just 637 contracts. More than 77% of those calls traded in a strong buying pattern, many in large chunks for prices ranging from 22 cents to 28 cents. Shares of the semiconductor wafer manufacturer closed Monday at $14.67, down a penny on the session. The stock has enjoyed a nice surge this month but is still churning in a very tight range that has been in place since a drop back in October, and it has been under its 200-day moving average ever since. Now the 200-day average is just above $15, so the stock will need quite a push for those May 18 calls to perform. The shares, which haven't traded above $18 since Sept. 24, would need to gain roughly 24% for those options to be profitable. Overall calls at all strikes in the name outnumbered puts by 3.7 to 1. At the time of publication, Najarian owned MEMC calls. .