American Leauge Baseball Club of New York. Inc. issued to and signed by Daniel Topping as president. It is for 900 shares at $100 per and dated November 25, 1947. 

Daniel Reid Topping (June 11, 1912 – May 18, 1974) was a part owner and president of the New York Yankees baseball team from 1945 to 1964. During Topping's tenure as chief executive of the Yankees, the team won 14 American League pennants and ten World Series championships.

During the WW2, while serving in California, Topping ran into Larry MacPhail. MacPhail, then the president of the Brooklyn Dodgers baseball team, and Topping were acquainted because both Dodgers athletic teams (baseball and football) played at Ebbets Field. In California, MacPhail told Topping of his interest in purchasing the New York Yankees. MacPhail invited Topping to join the syndicate attempting to purchase the team from the estate of Jacob Ruppert. Along with Del Webb, the group purchased a 96.88% interest in the Yankees for $2.8 million in January 1945. In March, they bought the remaining 3.12%, giving them complete control of the team. MacPhail was named team president, while Topping and Webb were named vice presidents.

MacPhail became increasingly erratic and maniacal. After a drunken episode at the Biltmore at a Yankees 1947 World Series celebration dinner, MacPhail sold his share of the team to Topping and Webb for $2 million. Topping and Webb became co-owners of the Yankees, each with a 50% share. Webb became active in American League affairs, while Topping directed team operations.

The two sold a 80% interest in the team to CBS in 1964 for $11.2 million. Webb and Topping each retained a ten percent share of the club.[4] Webb sold his interest in 1965. Topping remained as team president until 1966, when he sold his remaining stake in the Yankees.

History from Wikipedia and RM Smythe.