Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Twitter (TWTR) upgraded to Buy from Neutral at MKM Partners with analyst Rob Sanderson telling investors that the service is "here to stay," citing its rebounding user growth and continued turnaround progress. 2. Macerich (MAC) upgraded to Outperform from Market Perform at BMO Capital and to Buy from Neutral at Mizuho. 3. Home Bancshares (HOMB) upgraded to Buy from Hold at Sandler O'Neill and to Outperform from Market Perform at Fig Partners. 4. UGI Corporation (UGI) upgraded to Buy from Neutral at UBS with analyst Shneur Gershuni saying the company offers above average earnings growth potential and strong financial metrics. 5. Darden (DRI) upgraded to Outperform from Market Perform at Bernstein. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.