Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Wal-Mart (WMT) upgraded to Overweight from Equal Weight by Barclays analyst Karen Short, who assumed coverage of Wal-Mart and upped the price target for the shares to $87 from $70. Wal-Mart is Short's top pick in the sector, as she believes the retailing giant's "re-emergence as a disruptor" has the potential to "wreak havoc" on many companies in the space. 2. Cabot Oil & Gas (COG) upgraded two notches to Strong Buy from Market Perform by Raymond James analyst Kevin Smith, who said Cabot has improving fundamentals, a "prolific" growth outlook, and an attractive valuation. 3. BioDelivery Sciences (BDSI) upgraded to Buy from Neutral by Janney Capital analyst Ken Trbovich, who said that Endo International (ENDP), which uses BioDelivery's drug delivery technology, has "not yet announced, but clearly won" preferred status for Belbuca relative to market leader Butrans on United Healthcare's Prescription Drug List. 4. Packaging Corp. (PKG) upgraded to Buy from Hold by Deutsche Bank analyst Debbie Jones, citing an "improved earnings trajectory" following the TimBar acquisition. The analyst raised her price target for the shares to $90 from $77. 5. Prudential Financial (PRU) upgraded to Conviction Buy from Neutral by Goldman Sachs analyst Michael Kovac, who says his earnings estimates are now above consensus due to favorable equity markets, slowing rate pressure and lower currency headwinds. He expects Prudential's earnings to grow 10% in 2017. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage,
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