Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. Cooper-Standard (CPS) downgraded to Sell from Neutral at Goldman Sachs with analyst David Tamberrino saying the company's production-levered content is "not differentiated enough to fight the cycle" and its exposure to manufacturers, particularly to Ford (F), is unfavorable. 2. Marathon Oil (MRO) downgraded to Neutral from Overweight at Atlantic Equities with analyst Barry Maccarthy citing crude oil price concerns for the downgrade. 3. CyrusOne (CONE) downgraded to Neutral from Buy at UBS with analyst John Hodulik saying he expects the company to benefit from long-term secular trends in the data center industry but has growing concerns that near-term hyperscale demand will remain "subdued" longer than expected. 4. Union Pacific (UNP) downgraded to Equal Weight from Overweight at Barclays with analyst Brandon Oglenski saying he sees "real fundamental challenges set against high market expectations." 5. Welltower (WELL) downgraded to Market Perform from Outperform at Raymond James with analyst Jonathan Hughes citing relative valuation. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.