A roundup of tech ratings changes

|By:, SA News Editor

SolarCity (SCTY +7.3%) has been started at Buy by BofA/Merrill.

Salesforce (CRM +2.1%) has been upgraded to Strong Buy by Raymond James.

Activision (ATVI +1%) has been started at Overweight by Barclays.

MA-Com (MTSI +2.7%) has been upgraded to Overweight by Stephens.

Russian carriers VimpelCom (VIP -0.5%) and MTS (MBT -1.8%) have been cut to Hold by Deutsche, and so has Aixtron (AIXG +3.2%)

NII Holdings (NIHD -4.3%) has been cut to Underperform by Credit Suisse.

Celestica (CLS -1.4%) has been cut to Hold by Canaccord.

Aruba (ARUN +1.7%) has been started at Outperform by Northland.

Applied Optoelectronics (AAOI +10.9%) has been started at Strong Buy by Raymond James.

Xoom (XOOM +6.9%) has been started at Buy by SunTrust.

Montage (MONT -0.4%) has been assigned five bullish ratings, and no neutral/bearish ones, on underwriter coverage day.