First Solar downgraded, Fortinet upgraded: Wall Street's top analyst calls

Upgrades Summary - Barclays upgraded Zillow Group (ZG) to Equal Weight from Underweight with a price target of $72, increased from $66, citing that significant downside risks are already reflected in the stock price [2] - Rosenblatt upgraded Fortinet (FTNT) to Buy from Neutral with a price target of $100, up from $85, based on positive channel checks indicating a "meaningful inflection" in demand ahead of the Q4 report on February 5 [2] - Benchmark upgraded Littelfuse (LFUS) to Buy from Hold with a price target of $360, following a strong Q4 report and an optimistic outlook as demand improves across the business [2] - Morgan Stanley upgraded Cencora (COR) to Overweight from Equal Weight with a price target of $400, up from $361, highlighting the company's leadership in specialty markets, which will be enhanced by the acquisition of a majority stake in OneOncology [2] - Chardan upgraded Korro Bio (KRRO) to Buy from Neutral with a price target of $15 after the analyst day, indicating that the company has "turned the page" [2] - Piper Sandler also upgraded Korro Bio to Overweight from Neutral [2]