Major Pre-Market Losers

Commerce Bancshares CBSH is trading down nearly 59% after being cut to Underperform by Bank of America-Merrill Lynch. Sourcefire FIRE is trading down over 58% after being cut to Neutral from Buy at UBS. Wolverine World WWW is trading down over 7.50% despite beating earnings estimates. Rue21 RUE is trading down nearly 6.75% after being cut to Neutral from Buy at Nomura. Quest Software QSFT is trading down roughly 6% after reporting Q2 Preliminary results.