Analysts at Stifel downgraded Twitter, Inc. (TWTR) from ‘Buy’ to ‘Hold’ in a research report issued to clients on Monday, noting they do not see how an exodus of top company execs — media head Katie Jacobs Stanton, product head Kevin Weil, the head of the engineering division, Alex Roetter and HR head Brian “Skip” […] View the full post at: Notable Downgrades: Twitter (TWTR), OvaScience (OVAS), SanDisk (SNDK), Ford Motor (F) Related posts: Insider Selling: Twitter (TWTR) CEO Unloads $5M Worth of Stock Some Twitter Thoughts Ford to Raise Cash Through 300 mln Share Offering