Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Marathon Oil (MRO) upgraded to Buy from Hold at Stifel with analyst Derrick Whitfield saying he believes the company is well positioned to outperform in 2020 based on its commitment to shareholder returns and improving capital efficiency. 2. Denali Therapeutics (DNLI) upgraded to Buy from Neutral at Goldman Sachs analyst Salveen Richter saying he believes Denali is evolving into a triple platform story with a small molecule portfolio targeting mutated genetic targets/pathways; a leverageable multi-modality blood brain barrier Transport Vehicle platform; and a potential next-generation viral vector gene therapy vertical. 3. e.l.f. Beauty (ELF) upgraded to Buy from Hold at Jefferies with analyst Stephanie Wissink saying the stock is down 25% from its multi-year high of $19.96 that was reached on November 7. 4. Chipotle (CMG) upgraded to Neutral from Sell at UBS with analyst Dennis Geiger saying he is increasingly more confident in the sustainability of the company's strong sales and earnings growth over the next couple of years, with results having exceeded his expectations "significantly" over the recent quarters. 5. Biogen (BIIB) upgraded to Buy from Hold at Canaccord with analyst Sumant Kulkarni saying he admits to being "surprised as anyone" by Biogen's "sudden revival" in October of aducanumab for early Alzheimer's disease. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.