In December 2005, the company acquired PacifiCare Health Systems. It agreed to divest parts of PacifiCare's commercial health insurance business in Tucson, Arizona and Boulder, Colorado to satisfy antitrust regulator concerns, and also agreed to end its network access agreement with Blue Shield of California. The Tucson business was sold to Cigna. The company acquired Prescription Solutions, another pharmacy benefit manager, as part of its acquisition of PacifiCare Health Systems. This business was later rebranded OptumRx. In February 2006, the company acquired John Deere Health Care. In February 2008, the company acquired Sierra Health Services for $2.6 billion. As part of the transaction, to obtain regulatory approval, 25,000 customers were sold to Humana. In July 2009, UnitedHealth Group agreed to acquire Health Net's Northeast licensed subsidiaries for up to $570 million in payments spread out over two years. Through 2010 and into 2011, senior executives of the company met monthly with executives of other health insurers to limit the effect of the health care reform law. In July 2010, Ingenix acquired Picis Clinical Solutions, Inc., a health information provider for the high-acuity areas of hospitals. In 2011, Logistics Health, Inc. of La Crosse, Wisconsin, was acquired by OptumHealth. In September 2014, the office buildings where LHI is based were sold to UnitedHealth Group for $45 million. In February 2012, the company acquired XLHealth, a sponsor of Medicare Advantage health plans with a primary focus on medicare recipients with special needs such as those with chronic illness and those eligible for Medicaid ("dual eligibles"). In October 2012, UnitedHealth Group and Amil Participações, one of the biggest Brazilian health insurance companies, completed the first phase of their merger. In February 2014, Optum secured a majority stake in the Washington, D.C.-based startup Audax Health. Audax's CEO, Grant Verstandig, continued running the firm alongside COO David Ko. In October 2014, Optum Health acquired the health services unit of Alere for $600 million cash. In March 2015, it was announced that CatamaranRx will be acquired by OptumRx. In April 2016, the company announced it was pulling out of all but a "handful" of state healthcare exchanges provided under Affordable Care Act and will continue to sell only in three states in 2017. In 2017, UnitedHealth's Optum unit acquired Rally Health, a company started by Audax Health's executives. Prior to acquisition, in 2015, UnitedHealth supported Rally Health as a majority investor, and through enrolling 5 million