Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. Biogen (BIIB) was downgraded to Equal Weight from Overweight at Morgan Stanley and Market Perform from Outperform at Leerink. 2. United Continental (UAL) downgraded to In Line from Outperform at Evercore ISI. 3. Tyson Foods (TSN) downgraded to Hold from Buy at Argus with analyst John Staszak citing the SEC probe of Tyson and other poultry producers, potential decelerating earnings in coming quarters, and a recent bird flu outbreak in two states. 4. Williams-Sonoma (WSM) downgraded to Market Perform from Outperform at William Blair with analyst Daniel Hofkin citing the company's fourth quarter results. 5. Inovio (INO) downgraded to Neutral from Overweight at Piper Jaffray with analyst Charles Duncan saying a "lack of focus and advancement for any one program" poses execution risk to the broader platform, and to shareholders. The analyst lowered his price target for the shares to $9 from $13 following the company's Q4 results. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.