 Perrigo PLC shares PRGO, 0.37 slid 4 in premarket trade Wednesday, after the personal self-care product maker swung to a loss for the first quarter and fell short of estimates. The Dublin-based Perrigo posted a net loss of 2.4 million, or 2 cents a share, after income of 38.1 million, or 28 cents a share, in the year-earlier period. 