Of the current world tour [1]: five.

  * BMC RACING TEAM
  * CANNONDALE PRO CYCLING TEAM
  * LAMPRE - MERIDA
  * TEAM GIANT - ALPECIN
  * TREK - SEGAFREDO

(I may have missed some)

But note that many if not all teams are sponsored by manufacturers (frames, wheels, geartrain, etc).

Edit: five. Forgot Merida.

[1] http://www.uci.ch/road/teams/