According to Forbes, these stocks were the worst performing during 2012:
Navistar International NAV -45%
Best Buy BBY -47%
JC Penney JCP -48%
AK Steel Holding AKS -50%
Cliffs Nat Resources CLF -50%
Advanced Micro Devices AMD -56%
Alpha Nat Resources ANR -59%
Supervalu SVU -66%
Eastman Kodak EKDKQ -68%
NII Holdings HII -75%
This list published by Forbes in early December 2012, failed to include Groupon, Inc. which, at $5.30, is down 80% since the beginning of 2012.
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Disclosure: I have no positions in any stocks mentioned, and no plans to initiate any positions within the next 72 hours.