SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 05/20/08          |
--------------------------------------------------------------| 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:       40,844
COMMITMENTS
  10,575    3,012    3,833   26,176   33,770   40,584   40,615      260      229

CHANGES FROM 05/13/08 (CHANGE IN OPEN INTEREST:       -673)
    -990   -2,248    1,220     -994      235     -765     -793       92      120

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    25.9      7.4      9.4     64.1     82.7     99.4     99.4      0.6      0.6

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       36)
      15        7       15       14       14       35       30


Updated May 23, 2008