Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. Oclaro (OCLR) downgraded to Market Perform from Strong Buy at Raymond James and to Neutral from Buy at B. Riley FBR. 2. Vocera (VCRA) downgraded to Market Perform from Outperform at Leerink with analyst David Larsen citing valuation and concerns over revenue growth expectations for the downgrade. 3. Orexigen (OREX) downgraded to Underperform from Market Perform at Wells Fargo with analyst Jim Birchenough citing the company's pending Chapter 11 bankruptcy and restructuring. 4. Piedmont Office Realty (PDM) downgraded to Sell from Hold at Stifel while Highwoods Properties (HIW) was downgraded to Hold from Buy. 5. Chegg (CHGG) downgraded to Neutral from Buy at Citi with analyst Nithin Pejaver citing valuation with the shares up 36% year-to-date. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.