Clients

When it comes to working in the refinery space, there's virtually no major company that Diamond hasn't worked with. Our clients are specialized and diverse, and they also happen to be some of the biggest names in the refinery industry today. Over the years we've had the opportunity to work with:

Valero 

Marathon Petroleum Corporation 

Motiva Enterprises 

Tesoro Corporation 

Citgo 

CountryMark 

Western Refining
Delek Refining
Phillips 66
Shell
ExxonMobil

CVR Energy 

Calumet 

Wyoming Refining 

LyondellBasell 

Occidental Chemical Corp. 

Axiall
Wynnewood Refining
BASF
Dow Chemical
Holly Frontier
Suncor Energy