The Gartner report also found that IBM was number one in the market for UNIX servers with 52.8 percent market share in the fourth quarter of 2011. IBM increased quarterly revenues by 17 percent year over year with IBM Power Systems and improved its share in comparison to Q4 2010 by 10.9 percent. For the full year of 2011, IBM led the UNIX server market with 45.9 percent market share, a gain of 6.9 points over 2010. IBM grew UNIX revenues by 23 percent over 2010, according to Gartner.
IBM led the market for servers costing more than $250,000, attaining 69.4 percent factory revenue share in the fourth quarter with IBM System z mainframes and Power Systems. IBM also led this market for the full year of 2011 with 8 percent revenue growth over 2010, capturing 63.7 percent market share.