With the latest additions to the chorus, shareholders representing almost 14 percent of Dell shares not held by Michael Dell have now said they will vote against the deal. Billionaire Dell, who created the computer maker out of his college dorm room in 1984, holds a roughly 16 percent stake. Dell shares rose on Friday after Southeastern's announcement, briefly trading above the $13.65 offer price before settling slightly to close up 0.7 percent at $13.63. "We are writing to express our extreme disappointment regarding the proposed go-private transaction, which we believe grossly undervalues the Company," Southeastern CEO Mason Hawkins and Chief Investment Officer Staley Cates wrote in a letter. "We retain and intend to avail ourselves of all options at our disposal to oppose the proposed transaction, including but not limited to a proxy fight, litigation claims and any available Delaware statutory appraisal rights."