Formed in 2002, Linden is a healthcare and life sciences private equity firm that builds value in mature businesses. Linden's investment strategy is to purchase controlling equity interests in privately held companies and non-core businesses that can benefit from strategic redirection, operational improvements, acquisitions and additions to the management team. Linden invests primarily in leveraged buyouts or other late stage transactions where it can be the lead investor or otherwise have significant governance influence. Linden does not make venture capital investments. To invest in mature companies of all sizes, Linden formed an alliance with Madison Dearborn Partners (see profile) to pursue large healthcare and life science buyout transactions (transactions requiring more than $50 million in private equity capital). Linden pursues smaller transactions (requiring less than $50 million in private equity capital) using its own funds.