Catch up on today's top five analyst downgrades with this list compiled by The Fly: 1. Occidental Petroleum (OXY) downgraded to Hold from Buy at Argus with analyst Bill Selesky citing its confirmed purchase of Anadarko Petroleum (APC) for $76 per share and saying the company is overpaying for the assets with a bid well above that of Chevron's (CVX) $65 per share offer. 2. Nomura (NMR) downgraded to Sell from Neutral at Citi with analyst Koichi Niwa saying he sees a "grim" earnings environment for Nomura's domestic retail division and fixed income business. 3. Sito Mobile (SITO) downgraded to Hold from Buy at Lake Street with analyst Mark Argento citing the company's "big" Q1 miss and said he sees uncertainty around Sito Mobile's new product strategy and liquidity concerns in the near term. 4. The Stars Group (TSG) downgraded to Hold from Buy at Desjardins. 5. Roan Resources (ROAN) downgraded to In-Line from Outperform at Imperial Capital with analyst Irene Haas saying the company's Q1 earnings missed expectations due to well performance, ethane rejection, and weak NGL prices. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.