Miriam Adelson, the widow of casino magnate Sheldon Adelson, is selling $2 billion of stock in Las Vegas Sands Corp. so the family can acquire a majority stake in an unidentified professional sports team.

The family already has a binding purchase agreement for a team, according to a regulatory filing Tuesday. The Adelsons will use the proceeds from the offering as well as cash on hand to purchase the team, “subject to customary league approvals.”