SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 05/13/08          |
--------------------------------------------------------------| 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:       41,517
COMMITMENTS
  11,565    5,260    2,614   27,170   33,535   41,349   41,408      168      109

CHANGES FROM 05/06/08 (CHANGE IN OPEN INTEREST:      3,718)
     859    1,160     -444    3,215    2,939    3,629    3,655       88       63

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    27.9     12.7      6.3     65.4     80.8     99.6     99.7      0.4      0.3

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       36)
      15        7       14       14       14       35       29


Updated May 16, 2008