SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
FUTURES ONLY POSITIONS AS OF 05/20/08                         |
--------------------------------------------------------------| 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:       27,155
COMMITMENTS
  10,536    3,702      574   15,807   22,739   26,917   27,015      238      140

CHANGES FROM 05/13/08 (CHANGE IN OPEN INTEREST:      1,471)
     175     -287      -30    1,169    1,653    1,314    1,336      157      135

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADERS
    38.8     13.6      2.1     58.2     83.7     99.1     99.5      0.9      0.5

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       35)
      15        7       12       12       13       31       28
 

Updated May 23, 2008