It accounts for more than 40% of the world's economy and includes superpowers such as the US and Japan.
While the monumental deal is aimed at liberalising commerce across the countries, not all of the industries and sectors involved will benefit as much as others.
Here's a look at some of the major winners and losers of the free trade agreement that would cut thousands of taxes or tariffs.
The agreement on the Tran-Pacific Partnership (TPP) between 12 Pacific Rim countries is being touted as the biggest trade deal the world has seen in two decades.