Workday Inc (NASDAQ:WDAY) stock is surging today, up 8.6% at $237.92 at last glance, after activist investor Elliott Investment Management unveiled a$2 billion stake in the software name and showed support for the company's leadership. Plus, Workday announced a $4 billion share buyback, just one day after announcing its acquisition of AI firm Sana for roughly$1.1 billion. In response, Piper Sandler upgraded the stock to "neutral" from "overweight," while Guggenheim upped its rating to "buy" from "neutral. ...