Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. Pfizer (PFE) downgraded to Neutral from Overweight at JPMorgan with analyst Christopher Schott citing valuation. 2. Splunk (SPLK) resumed with a Neutral from Buy at Guggenheim with analyst Imtiaz Koujalgi saying while the company's fundamentals are strong, he's "looking for more clarity." 3. CalAmp (CAMP) downgraded to Outperform from Strong Buy at First Analysis and to Market Perform from Outperform at Northland. 4. Acorda Therapeutics (ACOR) downgraded to Sell from Neutral at Goldman Sachs with analyst Salveen Richter saying the commercial outlook for Inbrija appears limited. 5. Versum Materials (VSM) downgraded to Sell from Neutral at Goldman Sachs with analyst Toshiya Hari saying while he remains constructive on the Semiconductor Materials sub-sector broadly, he believes the market is underestimating the extent to which weaker semiconductor capital expenditures could negatively impact the Delivery Systems and Services segment. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.