Folks, China is an industrial… you get the point. As you continue to read this list you will begin to notice an interesting pattern. PetroChina is the world’s largest oil company, with more than 552,000 employees! To put that in perspective, competitor ExxonMobil has a workforce of “only” 75,000. PetroChina has a market value of $202 billion. That’s a lot, guys.