18 Biggest Mid-Day Losers For Monday By: Benzinga via Benzinga October 09, 2017 at 12:55 PM EDT Tandem Diabetes Care Inc (NASDAQ: TNDM) shares tumbled 23.2 percent to $0.630. Tandem Diabetes’ board authorized to effect ... Read More >> Related Stocks: 22nd Century Group Inc Axalta Coating Systems Ltd Conn's Inc DaVita HealthCare Partner Express Scripts Holding K2M Group Hldngs Marinus Pharma CS Medtronic Mellanox Technologies Ptc Therapeutics Symantec Corp Synaptics Inc Travelcenters of America Llc Viacom Virnetx Holding Corp