From the official site:
Previously known as MAN, Ferrostaal become the Club’s fourth partner and join with Etihad Airways, Umbro and Etisalat, the latter is a deal which was announced during the Club’s recent trip to Abu Dhabi.
Ferrostaal, a global provider of industrial services in plant construction and engineering, is based in Essen, Germany and employs around 4,440 people in more than 60 different countries. In 2008, its annual turnover amounted to 1.6 billion Euros.
As a result of the deal, which will run until the end of the 2011/12 Premier League season, Ferrostaal’s company logo will appear on perimeter boards at every home league and domestic cup game.
In addition, a pre-season friendly will be played against a German Bundesliga club in the region, during the closed season of each of the three years of the deal.