SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
FUTURES ONLY POSITIONS AS OF 05/08/07                         |
--------------------------------------------------------------| 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:       14,907
COMMITMENTS
   3,372      171      605    9,991   13,177   13,968   13,953      939      954

CHANGES FROM 05/01/07 (CHANGE IN OPEN INTEREST:        547)
     134       87        0      320      361      454      448       93       99

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADERS
    22.6      1.1      4.1     67.0     88.4     93.7     93.6      6.3      6.4

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       25)
      11        3        4        9       10       21       16
 

Updated May 11, 2007