Silver Lake Partners closed its third fund, Silver Lake Partners III, with $9.3 billion, sources said. Its second fund closed in 2006 with $3.6 billion. Investors in the new fund include the $66.3 billion Washington State Investment Board, $63.8 billion Minnesota State Board of Investment, $41.7 billion Illinois Teachers Retirement System and $17.2 billion Indiana Public Employees Retirement Fund. Elizabeth Hanahan, Silver Lake spokeswoman, declined to comment. The $240.6 billion California Public Employees Retirement System, Sacramento, has a 9.9% stake in the private equity firm.