SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 05/06/08          |
--------------------------------------------------------------| 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:       37,800
COMMITMENTS
  10,707    4,100    3,058   23,955   30,596   37,720   37,753       80       47

CHANGES FROM 04/29/08 (CHANGE IN OPEN INTEREST:       -871)
      45      813   -1,409    1,002      297     -362     -299     -508     -572

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    28.3     10.8      8.1     63.4     80.9     99.8     99.9      0.2      0.1

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       33)
      11        8       12       14       14       31       28


Updated May 9, 2008