Exxon Mobil Corp. now tops Forbes' Fortune 500 list.
The 2009 Fortune 500 list is out and one North Texas company has risen to the top.
Irving-based Exxon Mobil Corp. moved up on spot, knocking Wal-Mart down to second place.
Dallas-based AT&T moved up two spots to No. 8.
ConocoPhillips, based in Houston, came in fourth while San Antonio-based Valero Energy came in at No. 10.