Tandem Diabetes Care Inc. (NASDAQ:TNDM) stock is trading higher on Tuesday following an analyst upgrade, citing a long-term upside opportunity. • Tandem Diabetes Care stock is among today’s top performers. Why is TNDM stock up today?Analyst Matt O'Brien upgraded from Neutral to Overweight, citing stronger long-term revenue potential driven by its shift to the pharmacy channel, international growth opportunities and upcoming product catalysts.Pharmacy Channel Shift Seen Driving Revenue UpsideO'Brien estimate ...