SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 05/01/07          |
--------------------------------------------------------------| 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:       17,586
COMMITMENTS
   3,267      591      827   12,633   15,227   16,728   16,646      858      940

CHANGES FROM 04/24/07 (CHANGE IN OPEN INTEREST:      2,006)
    -103      327      158    1,590    1,040    1,645    1,525      361      481

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    18.6      3.4      4.7     71.8     86.6     95.1     94.7      4.9      5.3

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       23)
       9        3        5       11       10       21       17
 

Updated April 27, 2007