News Release

Exchange to Change Margins for Natural Gas, Related Futures Contracts

Tue Sep 26 2006

NEW YORK, N.Y., September 26, 2006 — The New York Mercantile Exchange, Inc. today announced margin changes for its natural gas, Henry Hub swap and penultimate swap, natural gas penultimate and last day, and NYMEX miNYTM natural gas futures contracts at the close of business on Thursday.

Margins for the first month of the natural gas and natural gas penultimate and last day futures contracts will remain unchanged. Margins for the second month will decrease to $8,000 from $9,000 for clearing members, to $8,800 from $9,900 for members, and to $10,800 from $12,150 for customers. The margins for the third to fifth months will decrease to $9,000 from $10,000 for clearing members, to $9,900 from $11,000 for members, and to $12,150 from $13,500 for customers. Margins for the sixth month will decrease to $6,000 from $10,500 for clearing members, to $6,600 from $11,550 for members, and to $8,100 from $14,175 for customers. Margins for the seventh to 17th months will decrease to $5,500 from $6,000 for clearing members, to $6,050 from $6,600 for members, and to $7,425 from $8,100 for customers. Margins for the 18th 29th months will decrease to $3,500 from $5,500 for clearing members, to $3,850 from $6,050 for members, and to $4,725 from $7,425 for customers. Margins for the 30th to 41st months will increase to $3,750 from $3,000 for clearing members, to $4,125 from $3,300 for members, and to $5,063 from $4,050 for customers. Margins for the 42nd to 53rd months will increase to $4,000 from $2,500 for clearing members, to $4,400 from $2,750 for members, and to $5,400 from $3,375 for customers. Margins for all other months will increase to $4,250 from $2,500 for clearing members, to $4,675 from $2,750 for members, and to $5,738 from $3,375 for customers.

Margins for the first month of the NYMEX miNY natural gas and Henry Hub swap and penultimate swap futures contracts will remain unchanged. Margins for the second to fifth months will decrease to $2,000 from $2,250 for clearing members, to $2,200 from $2,475 for members, and to $2,700 from $3,038 for customers. Margins for the third to fifth months will decrease to $2,250 from $2,500 for clearing members, to $2,475 from $2,750 for members, and to $3,038 from $3,375 for customers. Margins for the sixth month will decrease to $1,500 from $2,625 for clearing members, to $1,650 from $2,888 for members, and to $2,025 from $3,544 for customers. Margins for the seventh to 17th months will decrease to $1,375 from $1,500 for clearing members, to $1,513 from $1,650 for members, and to $1,856 from $2,025 for customers. Margins for the 18th to 29th months will decrease to $875 from $1,375 for clearing members, to $963 from $1,513 for members, and to $1,181 from $1,856 for customers. Margins for the 30th to 41st months will increase to $938 from $750 for clearing members, to $1,031 from $825 for members, and to $1,266 from $1,013 for customers. Margins for the 42nd to 53rd months will increase to $1,000 from $625 for clearing members, to $1,100 from $688 members, and to $1,350 from $844 for customers. Margins for all other months will increase to $1,063 from $625 for clearing members, to $1,169 from $688 members, and to $1,434 from $844 for customers.

Contact: Anu Ahluwalia , 212-299-2439

Corporate Communications

+1 312 930 3434
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