SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 05/15/07          |
--------------------------------------------------------------| 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:       17,000
COMMITMENTS
   3,355    1,261      308   12,963   14,338   16,627   15,907      374    1,093

CHANGES FROM 05/08/07 (CHANGE IN OPEN INTEREST:     -1,076)
     -71      652     -513       86   -1,342     -498   -1,203     -578      127

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    19.7      7.4      1.8     76.3     84.3     97.8     93.6      2.2      6.4

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       27)
       8        8        4       10       10       21       19
 

Updated May 18, 2007