Short, who is president of Texas-based private equity firm Lone Star Funds, bought a 30 percent share in the club last September to become the majority shareholder.
"Even before today he has personally invested more in Sunderland than all previous chairmen, directors and owners combined," chairman and former player Niall Quinn said on the website.
"Today's announcement opens the door for a new era at the Stadium of Light," Quinn added.
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