This private-label food manufacturer might be going even more private.Shares of leading private-label snacking and beverages manufacturer TreeHouse Foods (THS 3.47%) rose 31% this week as of 2 p.m. ET on Friday, according to data provided by S&P Global Market Intelligence.Octus, a global financial intelligence firm, learned that private equity firm Investindustrial was working on trying to acquire the beleaguered packaged foods company for $3 billion. This news sent shares rocketing higher, following the st ...