Source: The Street/Bloomberg
Investment Thesis
Houston, Texas-based Phillips 66 (PSX) is one of the world's largest downstream oil corporations in this "refiners" segment. It is a distinct group within the oil industry, which sometimes is not acting totally in correlation with the rest of the group.
The refining and marketing sector is a significant division of the oil industry, and holding at least one of those three US refiners in your long-term portfolio is highly recommended.
For investors interested in this particular segment, I recommend watching the VanEck Vectors Oil Refiners ETF (CRAK),