SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
FUTURES ONLY 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:       14,360
COMMITMENTS
   3,238       84      605    9,671   12,816   13,514   13,505      846      855

CHANGES FROM 04/24/07 (CHANGE IN OPEN INTEREST:        254)
    -125      -65       10       20      -87      -95     -142      349      396

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADERS
    22.5      0.6      4.2     67.3     89.2     94.1     94.0      5.9      6.0

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       21)
       8        2        4        9        9       18       14
 

Updated April 27, 2007