Shares of Medtronic /zigman2/quotes/206816578/composite MDT -2.53% gained 0.3% in premarket trading on Wednesday after the company said it received a warning letter from the Food and Drug Administration following an inspection at a factory that makes its MiniMed 600 series insulin infusion pump and a remote-controller device for MiniMe 508 and Paradigm pumps. The company said it will make corrections to quality system requirements. Medtronic's stock is down 4.6% for the year, while the broader S&P 500 /zigman2/quotes/210599714/realtime SPX -4.04% is up 25.4%.


