Tech ratings changes: OpenTable, Level 3, Altera, Xilinx, TelusApr. 3, 2014 9:36 AM ET|About: OpenTable, Inc. (OPEN)|By: Eric Jhonsa, SA News Editor OpenTable (OPEN +3.2%) has been upgraded to Buy by Citi. Level 3 (LVLT -1.3%) has been cut to Hold by Gabelli. Altera (ALTR +1.2%) and Xilinx (XLNX +0.8%) have been started at Outperform by FBR. Separately, Piper has assumed coverage of Altera at Overweight, and Xilinx at Neutral. Telus (TU -1.2%) has been cut to Neutral by Macquarie. The carrier recently announced a CEO change.