According to the business reports sent to the Financial Supervisory Service from the big three entertainment companies of K-Pop, SM, YG, and JYP Entertainment, SM Entertainment came out on top with the most revenue last year.
Last year, SM Entertainment made 270 billion won (~ $260 million USD), which is almost twice the revenue compared to two years prior in 2011, 140 billion won (~ $140 million USD). Meanwhile, YG made 120 billion won (~ $110 million USD), which is a 49% increase from 2011 when they posted revenue of 78 billion won (~ $76 million USD).
JYP Entertainment came in last with 21 billion won (~ $21 million USD). One entertainment rep said, "These companies are establishing affiliates and more, all of which are great factors to their business, so it looks like the profit scale will continue to grow in the future."
These three companies are influential to the point that some people say the whole broadcasting production process in itself would be difficult if there were no celebrities signed under one of three companies in the broadcasting world.