 The U.S.-listed shares of Canada-based networking company Sierra Wireless Inc. SWIR, 19.37 rose 0.2 in premarket trading and Canada-based semiconductor company Semtech Corp. SMTC, -6.19 dropped 0.8, after Semtech confirmed that it was in talks to buy Sierra Wireless for 31 a share. That represents a 4.4 premium to Mondays closing price for Sierras stock of 29.70. 