CHUY data by YCharts Not surprisingly, Facebook sits at top of the worst performers list for the past six months. Excluding companies with market capitalizations below $100 million, the next worst performer is Dubai based specialty rice company Amira Natural Foods ( ANFI), which was founded in 1915, and later became India's largest privately held rice company. Amira shares are down 23.5% since debuting last month at $10. This one is interesting on the surface, but I need to do some more digging. Shares of packaging name Berry Plastics Group ( BERY), which also went public last month, are down 13% since their debut. Berry is a $1.5 billion market cap company, with a considerable amount of debt; more than $4 billion. A laundry list of firms, including BofA/Merrill, Goldman, Citigroup, and Deutsche Bank initiated coverage of Berry this morning with buy ratings; but that debt load is a bit too hefty for me. Stay tuned. At the time of publication the author held no positions in any of the stocks mentioned.Follow @JonMHellerCFAThis article is commentary by an independent contributor, separate from TheStreet's regular news coverage.