Natural Gas Partners IX closed at $4 billion

Natural Gas Partners, a private equity firm that invests in the energy industry, closed its Natural Gas Partners IX fund at $4 billion. The firm’s last fund closed two years ago with $1.2 billion in capital. Investors in the fund include the $54.9 billion Minnesota State Board of Investment, $13 billion New Mexico Public Employees Retirement Association, $60 billion Virginia Retirement System and $16.6 billion Los Angeles Fire & Police Pension System.