According to http://www.frontierim.com/files/file/download/id/1220 the top 20 US Endowment funds allocate their assets like:

  Private Equity                   19%
  Domestic Equity                  13%
  Global Equity                     8%
  Emerging Equity                   8%
  Global Bonds                      9%
  Global Real Estate               10%
  Commodities/Natural Resources     8%
  Hedge Funds/Managed Futures      21%
  Cash                              4%