I will be using the following brackets for my analysis when it comes to Mcap if which I have also named the size of the company (please note that these are my individual names and my not be coherent to industry standards)
Mcap (in millions)
0-20M 'Oil Tiddlers'
20-50M 'Micro Oil Companies'
50-100M 'Small Oil Companies'
100-200M 'Medium Oil Companies'
200-500M 'Large Oil Companies'
500-1000M 'Huge Oil Companies'
1000-5000M 'Giant Oil Companies'
5000M and up 'Global Oil Companies'
I will soon be adding the constituents of these lists