SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
FUTURES ONLY POSITIONS AS OF 05/13/08                         |
--------------------------------------------------------------| 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:       25,684
COMMITMENTS
  10,361    3,989      604   14,638   21,086   25,603   25,679       81        5

CHANGES FROM 05/06/08 (CHANGE IN OPEN INTEREST:        763)
    -201     -296      276      681      817      756      797        7      -34

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADERS
    40.3     15.5      2.4     57.0     82.1     99.7    100.0      0.3      0.0

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       34)
      15        6        9       12       13       30       25
 

Updated May 16, 2008