Atos shares up 7 pct on stake building talk-traders

PARIS, July 6 (Reuters) - Shares in France's IT services group Atos Origin (ATOS.PA) rose 7 percent on market talk of a stake building in the stock, traders said on Monday.

"There is noise that Citigroup is buying for a big U.S. client," one London-based trader said.

Atos declined to comment. A London-based spokesman for Citigroup declined to comment.

One Paris-based trader said: "There is a rumour that Dell (DELL.O) could bid for Atos."

By 0912 GMT, the volume on Atos shares represented 104 percent of the stock's 90-day average daily volume. (Reporting by Blaise Robinson and Dominic Lau)