A roundup of tech ratings changes

|By:, SA News Editor

Rackspace (RAX -2.6%) has been started at Neutral by D.A. Davidson.

Take-Two (TTWO -3.8%) has been cut to Market Perform by Cowen.

Gogo (GOGO -1.9%) has been cut to Neutral by JPMorgan due to concerns about a Dec. 17 lockup expiration (67% of shares will be made available for sale).

ServiceSource (SREV +3.5%) has been upgraded to Buy by Credit Agricole.

Silicon Motion (SIMO +3.4%) has been started at Buy by BofA/Merrill.

Qiwi (QIWI +4.4%) has been started at Buy by Goldman shortly after beating Q3 estimates and upping its full-year guidance.