Chinese-American tech billionaire Lin Bin purchased a small stake in the Miami Dolphins at a valuation of $12.5 billion, a record for a publicly known minority transaction, Sportico reported Tuesday. Bin is acquiring a 1% stake in the holding company that owns the Dolphins, Hard Rock Stadium, Formula 1's Miami Grand Prix and part of the Miami Open tennis tournament. The previous top valuation for a minority transaction was $10 billion, set in October when the Koch family bought 10% of the New York Giants.