Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. Sunoco (SUN) downgraded to Underperform from Hold at Jefferies with analyst Christopher Sighinolfi saying escalating leverage will lead to a distribution cut by year end. 2. Capital One (COF) downgraded to Underperform from Neutral at Sterne Agee CRT with analysts led by Henry Coffey Jr. arguing Capital One will continue to underperform for a number of reasons including ongoing business line challenges, the impact on credit costs from Energy lending, lower spreads in auto, and long-term branch structural issues. 3. AbbVie (ABBV) downgraded to Equal Weight from Overweight at Morgan Stanley with analyst David Risinger saying AbbVie's pipeline is better appreciated following the recent R&D day and data disclosures at American Society of Clinical Oncology, or ASCO, over the weekend and is concerned that Humira's challenges from several biosimilar players and novel branded injectables and orals will continue to be an overhang on shares. Risinger lowered AbbVie's price target to $65 from $73 and views risk/reward on shares as balanced. 4. LendingClub (LC) downgraded to Market Perform from Outperform at FBR Capital with analyst Bob Ramsey saying demand is dropping and the company is going "radio silent." 5. ONEOK (OKE) and ONEOK Partners (OKS) downgraded to Hold from Buy at Jefferies. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.