18 Biggest Mid-Day Losers For Monday

Tandem Diabetes Care Inc TNDM shares tumbled 23.2 percent to $0.630. Tandem Diabetes’ board authorized to effect a 1-for-8 reverse stock split.
LiNiu Technology Group LINU shares declined 15.7 percent to $1.98 after rising 115.60 percent on Friday.
K2M Group Holdings Inc KTWO shares dipped 15.2 percent to $18.48 after the company issued a weak sales forecast.
22nd Century Group Inc XXII shares dropped 12.1 percent to $3.00 after the company reported a $54 million private placement.
Marinus Pharmaceuticals Inc MRNS shares fell 7.5 percent to $6.43.
TravelCenters of America LLC TA shares dropped 6.9 percent to $5.40.
Conn's Inc CONN slipped 6.6 percent to $26.10. Stifel Nicolaus downgraded Conn's from Buy to Hold.
Davita Inc DVA shares fell 6 percent to $56.22. JP Morgan downgraded DaVita from Neutral to Underweight.
VirnetX Holding Corporation VHC shares fell 5.5 percent to $7.70 after climbing 13.19 percent on Friday.
PTC Therapeutics, Inc. PTCT declined 5.2 percent to $18.62. JP Morgan downgraded PTC Therapeutics from Neutral to Underweight.
Express Scripts Holding Company ESRX slipped 5.1 percent to $59.16. Raymond James downgraded Express Scripts from Market Perform to Underperform.
Viacom, Inc. VIAB shares dropped 4.7 percent to $25.87. Citigroup downgraded Viacom from Neutral to Sell.
Axalta Coating Systems Ltd AXTA shares declined 4.4 percent to $29.19 after the company lowered its guidance for 2017.
Almost Family Inc AFAM fell 4.4 percent to $48.40. JP Morgan initiated coverage on Almost Family with a Neutral rating.
Mellanox Technologies, Ltd. MLNX shares dipped 4.1 percent to $45.55. Barclays downgraded Mellanox from Equal-Weight to Underweight.
Medtronic plc. MDT fell 3.8 percent to $76.80. Wells Fargo downgraded Medtronic from Outperform to Market Perform.
Synaptics, Incorporated SYNA shares slipped 2.7 percent to $37.46. Mizuho downgraded Synaptics from Buy to Neutral.
Symantec Corporation SYMC shares fell 2.5 percent to $33.12. Cowen downgraded Symantec from Market Perform to Underperform.