SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 04/29/08          |
--------------------------------------------------------------| 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:       38,670
COMMITMENTS
  10,662    3,287    4,467   22,954   30,298   38,082   38,052      588      619

CHANGES FROM 04/22/08 (CHANGE IN OPEN INTEREST:        922)
     431      655     -300      319      120      450      475      472      448

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    27.6      8.5     11.6     59.4     78.4     98.5     98.4      1.5      1.6

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       33)
      10        9       13       14       14       31       29


Updated May 2, 2008