VIX FUTURES - CBOE FUTURES EXCHANGE                                  Code-1170E1
OPTION AND FUTURES COMBINED POSITIONS AS OF 05/31/11          |
--------------------------------------------------------------| NONREPORTABLE
      NON-COMMERCIAL      |   COMMERCIAL    |      TOTAL      |   POSITIONS
--------------------------|-----------------|-----------------|-----------------
  Long  | Short  |Spreads |  Long  | Short  |  Long  | Short  |  Long  | Short
--------------------------------------------------------------------------------
($1000 X INDEX)                                      OPEN INTEREST:      242,358
COMMITMENTS
  31,558   49,510   50,663  136,402  123,983  218,623  224,156   23,735   18,202

CHANGES FROM 05/24/11 (CHANGE IN OPEN INTEREST:      6,718)
   5,950    3,551    4,334   -5,035     -828    5,249    7,057    1,468     -339

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    13.0     20.4     20.9     56.3     51.2     90.2     92.5      9.8      7.5

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:      130)
      45       36       63       28       28      115      105
 

Updated June 3, 2011