Walgreens Boots Alliance, Inc. is an American-British-Swiss holding company headquartered in Deerfield, Illinois that owns the retail pharmacy chains Walgreens and Boots, as well as several pharmaceutical manufacturing and distribution companies. The company was formed on December 31, 2014, after Walgreens purchased the 55% stake in Alliance Boots that it did not already own. The total price of the acquisition was $4.9 billion in cash and 144.3 million common shares with fair value of $10.7 billion. Walgreens had previously purchased 45% of the company for $4.0 billion and 83.4 million common shares in August 2012 with an option to purchase the remaining shares within three years. Walgreens became a subsidiary of the newly created company after the transactions were completed. As of 2022, Walgreens Boots Alliance is ranked #18 on the Fortune 500 rankings of the largest United States corporations by total revenue.