Perrigo Company plc is an American Irish-registered manufacturer of private label over-the-counter pharmaceuticals, and while 70% of Perrigo’s net sales are from the U.S. healthcare system, Perrigo is legally headquartered in Ireland for tax purposes, which accounts for 0.60% of net sales. In 2013, Perrigo completed the sixth-largest US corporate tax inversion in history when it reregistered its tax status to Ireland to avoid U.S. corporate taxes. Perrigo maintains its corporate headquarters in Grand Rapids, Michigan, within Michigan State University’s Grand Rapids Innovation Park.