Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. Seagate (STX) downgraded to Underweight from Equal Weight at Barclays with analyst Mark Moskowitz saying he believes upside potential from current levels is limited. 2. AT&T (T) downgraded to Neutral from Buy at BofA/Merrill with analyst David Barden citing reduced visibility into catalysts such as corporate tax reform and potential headwinds from the Time Warner (TWX) merger. 3. Legg Mason (LM) downgraded to Neutral from Buy at Citi with analyst William Katz citing valuation with the shares up 31% year-to-date. 4. Dana Holding (DAN) downgraded to Negative from Neutral at Susquehanna. 5. Calgon Carbon (CCC) downgraded to Neutral from Buy at Janney Capital with the firm citing the amendment to the ballast water convention approved by the International Maritime Organization, that delays the implementation schedule by two years. Given the lowered estimates, the firm cut its fair value estimate on the stock to $16 from $18. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.