Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. BB&T (BBT) upgraded to Buy from Neutral at B. Riley FBR and to Outperform from Market Perform at Wells Fargo. 2. Aratana Therapeutics (PETX) upgraded to Buy from Hold at Stifel with analyst Jonathan Block saying the early traction for Entyce, which was launched October 2017, has increased his conviction that the drug will act as the main revenue driver for Aratana in coming years. 3. Prologis (PLD) upgraded to Overweight from Neutral at JPMorgan with analyst Michael Mueller saying he is shuffling his ratings in the REIT space following GGP's (GGP) takeout by Brookfield Property Partners (BPY). 4. Brookfield Property (BPY) upgraded to Buy from Hold at Canaccord. 5. Roku (ROKU) upgraded to Neutral from Sell at Citi with analyst Mark May citing valuation for the upgrade following the stock's recent underperformance, but admits the upcoming lock-up expiration could serve as a negative catalyst. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.