SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
FUTURES ONLY 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:       15,303
COMMITMENTS
   3,424      841      193   11,560   13,413   15,177   14,447      126      856

CHANGES FROM 05/08/07 (CHANGE IN OPEN INTEREST:        396)
      52      670     -412    1,569      236    1,209      494     -813      -98

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADERS
    22.4      5.5      1.3     75.5     87.6     99.2     94.4      0.8      5.6

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       27)
       9        7        4        9       10       20       19
 

Updated May 18, 2007