Merrill Lynch upgraded several energy companies, taking them to buy ratings from their old neutral ratings.

Getting upgrades were

EOG Resources

(EOG) - Get Report

,

Frontier Oil

( FTO),

XTO Energy

( XTO),

Pogo Producing

(PPP)

and

Newfield Exploration

(NFX)

.

Also, Merrill, lifted its rating on

Lyondell Chemical

( LYO) to buy from neutral.