7 teams as of 2010 season
San Fransisco 49ers
Dallas Cowboys
Buffalo Bills
Denver Broncos
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The New York Giants won the Super Bowl in '86, '90, '07, and '11.
The Green Bay Packers won the Superbowl in '67, '68, '97, and '10
The Buffalo Bills, the Denver Broncos and the Minnesota Vikings have all lost four Super Bowls. The Broncos have won two Super Bowls, but the other two are winless in Super Bowl competition.