Benzinga's Top Pre-Market Losers

Rigel Pharmaceuticals (NASDAQ: RIGL ) shares dropped 17.36% to $3 in pre-market trading after the company reported that its R343 did not meet the primary endpoint in asthma study. Kraft Foods Group (NASDAQ: KRFT ) shares fell 2.10% to $51.71 in the pre-market trading. Kraft Foods has a PEG