Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Saia (SAIA) upgraded to Buy from Hold at Deutsche Bank with analyst Amit Mehrotra saying after meeting with management, he is incrementally more confident in Saia's ability to generate double-digit revenue growth this year. 2. Guess (GES) upgraded to Buy from Hold at Jefferies with analyst Janine Stichter saying the recent pullback in the stock puts the company's multiple below its historical average and peers. 3. Spirit Airlines (SAVE) upgraded to Buy from Neutral at Goldman Sachs with analyst Catherine O'Brien saying she expects passenger revenue trends for the company in the first half of the year to be stronger than previously anticipated. 4. MacroGenics (MGNX) upgraded to Buy from Sell at Citi with analyst Yigal Nochomovitz saying additional Phase 1 readouts in 2019 should provide further stock momentum for MacroGenics. 5. Cognizant (CTSH) upgraded to Outperform from Market Perform at BMO Capital with analyst Keith Bachman citing the company's FY19 revenue growth outlook and a positive management transition. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.