In December 2014, US drugstore chain Walgreens and Switzerland-based Boots Alliance completed the second step of the merger in order to form Walgreens Boots Alliance. The merger created the world's first pharmacy-led health and well-being enterprise. The stock trades on the stock exchange under the symbol "WBA." The two-step merger was announced in June 2012. The firms completed the first step of the merger in August 2012. Walgreens invested $4 billion in cash and 83.4 million shares of common equity for a 45% stake in Alliance Boots. The second step of the merger was completed in December 2014. It was completed following shareholder approval. Walgreens acquired 55% of the remaining stake for $3.5 billion in cash and 144 million shares of common stock. Walgreens Boots Alliance is mainly comprised of three divisions: