These are some of the top analyst upgrades, downgrades and initiations we have seen from Wall St. research calls this Tuesday. AmBev (NYSE: ABV) named Bear of the Day at Zacks. Baker Hughes Inc. (NYSE: BHI) started as Neutral at Credit Suisse. Citigroup Inc. (NYSE: C) raised to Strong Buy at Jefferies. Halliburton Co. (NYSE: HAL) started as Outperform at Credit Suisse. Heartland Financial USA Inc. (NASDAQ: HTLF) named Value stock of the day at Zacks. Home Loan Servicing Solutions Ltd. (NASDAQ: HLSS) started as Buy with $21 price target at BofA/ML. Kroger Co. (NYSE: KR) raised to Buy at Jefferies. Pinnacle West Capital Corp. (NYSE: PNW) raised to Outperform as Bull of the Day at Zacks.