Unusual activity in MEMC (WFR) today. Shares are down a nickel to $14.63 and 29K calls now traded, compared to 5,750 puts. The action includes the buyer of 4500 April 14 – May 15 call spreads at a nickel, which might roll a bullish position from one month to the next (The spread has traded 9000X total). May 18 and April 15 calls are among the most actives. May 15, April 14, and May 14 puts are busy as well. Implied volatility is up 3 percent to 43.5, but with no obvious news to explain the jump in WFR options activity Monday morning.