Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Caterpillar (CAT) upgraded to Buy at Argus by analyst John Eade, who said he sees signs that business is beginning to improve and valuation remains attractive. Eade said key commodity prices have begun to firm, which could lead to better results for the company and notes the company has a strong balance sheet and a focus on returning capital to shareholders. 2. AMC Networks (AMCX) upgraded to Outperform at Macquarie with analyst Tim Nollen saying he he likes the company's studio content the company has bought and built. 3. Tortoise Energy (TYG) upgraded to Buy at Stifel, citing valuation and its belief that the company owns attractive, blue chip MLPs. 4. Palo Alto Networks (PANW) upgraded to Buy at Wunderlich on expectations the company's market share gains and operating margin approach to growth should drive "significant price appreciation." 5. Newmont Mining (NEM) upgraded to Outperform at RBC Capital based on valuation. 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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