A roundup of tech ratings changes

|By:, SA News Editor

Teradata (TDC) has been cut to Neutral by Credit Suisse and Sterne Agee, and to Equal Weight by Morgan Stanley, following its Q3/2013 warning. Shares -14.9% premarket.

Dassault (DASTY.PK) has been cut to Underweight by HSBC a day after the company reported weaker-than-expected preliminary Q3 results and cut its full-year guidance. Shares -3.2% in Paris.

FireEye (FEYE) has received three bullish coverage launches and four neutral ones on underwriter coverage day. Shares +0.6%.

Texas Instruments (TXN) has been upgraded to Neutral by Susquehanna. Shares +0.5%.

Cogent (CCOI) has been upgraded to Buy by Citi.

Veeco (VECO) has been cut to Market Perform by Oppenheimer.

Marvell (MRVL) has been started at Outperform by Raymond James.