[fooman]

ConocoPhillips (Tosco-Flying J) 13.2
Shell (Motiva-Equilon-Pennzoil-Quaker State-Deer Park) 10.8
ExxonMobil 10.8
BP (Amoco-Arco) 9
Valero (Ultramar-Diamond Shamrock-Orion Refining) 8.4
ChevronTexaco 6.4
Citgo-PDV-Lyondell 5.8
Marathon-Ashland 5.6
Sunoco 5.2
Tesoro 3.4
Koch 3.1
Blackstone Group-Premcor 2.5
Williams Co 2.3
Chalmette Refining 1.1
TotalFinaElf 1
Top 15 in 2003 88.6

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It took me a awhile to find and then format this. It turns out that this market is pretty fragmented. I would not approve mergers that create more than 9% market share though.

[Rodney King]

Shell (Motiva-Equilon-Pennzoil-Quaker State-Deer Park) 10.8

No wonder Deer Park water tastes so bad.