Boots UK Ltd. (formerly Boots the Chemists Ltd), trading as Boots, is a health and beauty retailer and pharmacy chain in the United Kingdom and other territories including Ireland and Thailand. The parent company, The Boots Company Plc, merged with Alliance UniChem in 2006 to form Alliance Boots. In 2007, Alliance Boots was bought by Kohlberg Kravis Roberts and Stefano Pessina, taking the company private, and moving its headquarters to Switzerland, making it the first ever FTSE 100 company to be bought by a private equity firm.