On Assignment, Inc. (NYSE:ASGN), a leading global provider of diversified professional staffing solutions, announced today that the company once again made Staffing Industry Analysts’ (SIA) 2013 Lists of Largest Staffing Firms, and is now the 2 nd largest IT staffing firm in the United States. SIA creates the annual staffing firm lists to support buyer awareness as well as enable comparisons among companies in the industry. The rankings are based on 2012 estimated revenues by SIA, and reflect the combined revenue of On Assignment and Apex Systems. On Assignment acquired Apex Systems in May 2012 as part of its ongoing organic growth and acquisition strategy. On Assignment ranked 2 nd on SIA’s 2013 list of largest U.S. IT staffing firms with 5% market share, and 13 th on the list of largest U.S. staffing firms with 1.2% market share. Peter Dameris, President and CEO of On Assignment, commented, “We are very proud of our new position within the industry and our ranking on Staffing Industry Analysts’ 2013 lists of IT staffing firms and U.S. staffing firms.” On Assignment previously ranked 14 th with 1% market share and Apex Systems ranked 6th with 3% market share on SIA’s 2012 largest U.S. IT staffing firms list. On Assignment also increased its ranking on the list of largest U.S. staffing firms to 13 th with 1.2% market share, up from 22nd with 0.5% market share and Apex’s previously held 17th with 0.6% market share. Mr. Dameris continued, “The SIA rankings further affirm that On Assignment is a leading provider of professional staffing solutions, and is on target with our long-term growth strategies.” About On Assignment On Assignment, Inc. (NYSE: ASGN), is a leading global provider of in-demand, skilled professionals in the growing technology, healthcare, and life sciences sectors, where quality people are the key to success. We provide short- and long-term placement of contract, contract-to-hire, and direct hire professionals. With nearly three decades of experience, On Assignment focuses on positions that advance our clients’ competitive advantage while remaining the employer of choice for professionals at various stages in their career.