Artprice’s 2013/2014 report on the state of the Contemporary art market has some interesting data within the study. Here’s a chart of the top 3 Western auction houses selling Contemporary art which accounts for nearly a billion Euros.

We can see that Christie’s dominates the Contemporary market with a 55% share to Sotheby’s 36% and Phillips has 9% by value. In lots, its a different story where Christie’s accounts for 44% of the lot volume, Sotheby’s 32% and Phillips takes 24%.