Itaú, largest private bank in Brazil. Thanks to a 1995 law, all earnings from stock shares' dividends are tax exempt. They're always lobbying and pushing forward legislation to make the rich richer, to the point that they managed to found, together with other bankers, a political party, Novo, who fiercely defend libertarian economic values and sidestep individual liberties.
Second would be Microsoft. They took over the computer world in the 90s and didn't pay for their crimes. All they did was try and pretend nothing bad happened and that they totally wouldn't ever do anything similar again, pinkie promise. Nevermind the office2007 standard never fully working on alternative software, nevermind microsoft teams, pay no mind to them buying out github, nevermind their shit being inside pretty much every government around the world. They hold absurd amounts of power.
Third place goes to all non state owned petrol companies. Thank you for your continuous funding of bogus research against scientific climate facts and, more importantly, in funding assholes the world over to ensure climate change and global warming go full throttle. Fuck you with a hot exhaust pipe.