Pre-Market Losers Before 8:00 am

American Science & Engineering ASEI -13.81% on disappointing earnings yesterday. Dolby Laboratories DLB -11.07% after Piper Jaffray and JPMorgan lowered its PT. Charles Schwab SCHW -10.58% after the company broke a support level yesterday. Pacific Biosciences of California PACB -9.09% after JPMorgan downgraded the company to Neutral and lowered its PT. TTM Technologies TTMI -8.51% after announcing lower than expected Q3 EPS guidance.