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With that, it is my pleasure to turn the call over to Jerre Stead, IHS Chairman and CEO. Jerre?
Thank you, Andy. Good morning, welcome and a very happy New Year to all of our investors and to my IHS colleagues. It is a great pleasure this morning to share with you our outstanding results from the fourth quarter and for the full year of 2011. Before I do, I must begin with a real heartfelt thank you to my IHS colleagues around the world. The performance I am about to share with you is the direct result of the outstanding team work in collaboration displayed by each of my colleagues. I am very proud to be part of this team.
I will start with the quarterly financial highlights. Revenue was up 27% in the fourth quarter. Adjusted EBITDA increased by 33% and our adjusted EBITDA margin was 32.1%, the highest in our company’s history. The absolute dollar levels for Q4 revenue and profit were both company records. Q4 proved to be exactly what we thought it would be, accelerating organic growth on the top line, accompanied by meaningful margin expansion.
Our fourth quarter performance is a fitting capstone on a year characterized by focus and performance. In early November of 2010, we shared our vision for what we would accomplish in 2011. Since then, the world has seen many economic events that certainly have presented challenges for businesses around the world. Despite these global economic challenges we actively managed IHS to ensure that we continue to make the right investment decisions to drive strong profitable growth and to deliver ever better insight, information, and analytics to our customers around the globe every day. Therefore I am proud to share with you these annual results.