SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 04/22/08          |
--------------------------------------------------------------| 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:       37,748
COMMITMENTS
  10,231    2,632    4,767   22,634   30,178   37,632   37,577      116      171

CHANGES FROM 04/15/08 (CHANGE IN OPEN INTEREST:      2,094)
      99     -422    1,166      843    1,325    2,108    2,069      -13       26

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    27.1      7.0     12.6     60.0     79.9     99.7     99.5      0.3      0.5

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       32)
      10        8       12       14       14       31       27


Updated April 25, 2008