Pre-Market Losers

Quantum QTM is trading down 11% after being cut to Neutral by Sterne Agee.
Netgear NTGR is trading down over 9% after quarterly results yesterday.
Ancestry.com ACOM is trading down over 7% after reporting earnings yesterday.
Arch Coal ACI is trading down over 7% after quarterly results this morning.
Macy's M is trading down over 6%.
Keegan Resources KGN is trading down over 6%.
Abaxis ABAX is trading down over 6% after quarterly results yesterday.
Motorola Mobility MMI is trading down over 6% after quarterly results yesterday.
Masco MAS is trading down over 5%.