Islamic funds are professionally managed investment funds that pool money from many investors to purchase securities that have been screened for sharia compliance. They include mutual funds holding equity and/or sukuk securities, but also Islamic "alternative" funds deal in "anything from private equity and real estate to infrastructure and commodity asset classes." They began growing fairly rapidly in about 2004, and as of 2014 there were 943 Islamic mutual funds worldwide and as of May 2015, they held $53.2 billion of assets under management, with "latent demand" for considerable growth.