SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 05/08/07          |
--------------------------------------------------------------| NONREPORTABLE
      NON-COMMERCIAL      |   COMMERCIAL    |      TOTAL      |   POSITIONS
--------------------------|-----------------|-----------------|-----------------
  Long  | Short  |Spreads |  Long  | Short  |  Long  | Short  |  Long  | Short
--------------------------------------------------------------------------------
(CONTRACTS OF 25 U.S. EPA SO2 EMMISSION              OPEN INTEREST:       18,076
COMMITMENTS
   3,426      609      821   12,878   15,680   17,125   17,110      951      966

CHANGES FROM 05/01/07 (CHANGE IN OPEN INTEREST:        490)
     159       18       -6      244      452      397      464       93       26

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    19.0      3.4      4.5     71.2     86.7     94.7     94.7      5.3      5.3

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       25)
      10        4        6       11       11       23       19
 

Updated May 11, 2007