HEADLINE STOCKS-Some U.S. stocks on the move on July 6

(Updates to afternoon trading, adds Denbury, Green Plains, Spectrum, Smithfield and Sunoco)

NEW YORK, July 6 (Reuters) - Some U.S. stocks on the move on Monday:

DATA DOMAIN INC (DDUP.O)

EMC CORP (EMC.N)

NETAPP INC (NTAP.O)

EMC raised its all-cash offer to buy Data Domain to $33.50 per share. In addition, NetApp received all regulatory clearance to proceed with its proposed acquisition of Data Domain. [ID:nN06248956]

Shares of EMC rose 0.6 percent to $12.85 while Data Domain rose 2.7 percent to $34.10 and NetApp fell 1.5 percent to $18.67.

AMERICAN EXPRESS CO (AXP.N)

Stifel Nicolaus upgraded the credit card company to "hold," saying it was the least exposed to new rules on the sector because of its spend-centric model and low subprime exposure. [ID:nBNG124074]