The middle child is often forgotten, but in the case of the oil business it's the vital link between the extraction phase of oil (upstream) and the distribution phase (downstream). Midstream companies take care of the storage, processing, and transportation of petroleum products. This includes but is not limited to companies managing and operating pipelines, tanker ships, and storage facilities.
This Spark lists the midstream big guns that have market capitalizations greater than $1bn. We have excluded integrated oil companies (organizations covering every segment of the industry - upstream, midstream, and downstream), and instead have included stocks that have their value pinned to exclusively oil storage and transportation. However, this isn't advice - always remember to DYOR.