Other big names Richard Pzena, Charles Brobrinskoy and Bill Nygren upped their stakes.

FORBES: Big-Name Managers Piled Into Dell Stock: It's Even Cheaper Now

Among the biggest buyers were Whitney Tilson of T2 Partners Management, Bill Nygren of Oakmark Select and David Tepper of Appaloosa Management, according to datarama.

FORBES: Connect

Dell's board "is saying that no better option exists, " said Bill Nygren, manager of the Oakmark Fund and affiliates, which own about 25 million shares of Dell stock.

NPR: Dell To Go Private In $24.4B Deal Led By Founder