News Release

NYMEX to Change Margins for Natural Gas, Related Futures Contracts

Mon Nov 27 2006

NEW YORK, N.Y., November 27, 2006 — The New York Mercantile Exchange, Inc. today announced margin changes for its natural gas, Henry Hub swap, swing swap and penultimate swap, natural gas penultimate and last day, and NYMEX miNYTM natural gas futures contracts effective at the close of business tomorrow.

Margins for the first month of the natural gas, natural gas penultimate financial and natural gas last day financial futures contracts 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. Margins for the second month will decrease to $8,000 from $8,500 for clearing members, to $8,800 from $9,350 for members, and to $10,800 from $11,475 for customers. The margins for the third month will decrease to $7,500 from $8,500 for clearing members, to $8,250 from $9,350 for members, and to $10,125 from $11,475 for customers. Margins for the fourth to 27th months will remain the same. Margins for the 28th to 39th months will decrease to $3,500 from $3,750 for clearing members, to $3,850 from $4,125 for members, and to $4,725 from $5,063 for customers. Margins for the 40th to 51st months will decrease to $3,000 from $4,000 for clearing members, to $3,300 from $4,400 for members, and to $4,050 from $5,400 for customers. Margins for all other months will decrease to $2,500 from $4,000 for clearing members, to $2,750 from $4,400 for members, and to $3,375 from $5,400 for customers.

Margins for the first month of the NYMEX miNY natural gas and Henry Hub swap and penultimate swap futures contracts 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 second month will decrease to $2,000 from $2,125 for clearing members, to $2,200 from $2,338 for members, and to $2,700 from $2,869 for customers. The margins for the third month will decrease to $1,875 from $2,125 for clearing members, to $2,063 from $2,338 for members, and to $2,531 from $2,869 for customers. Margins for the fourth to 27th months will remain the same. Margins for the 28th to 39th months will decrease to $875 from $938 for clearing members, to $963 from $1,031 for members, and to $1,181 from $1,266 for customers. Margins for the 40th to 51st months will decrease to $750 from $1,000 for clearing members, to $825 from $1,100 for members, and to $1,013 from $1,350 for customers. Margins for all other months will decrease to $625 from $1,000 for clearing members, to $688 from $1,100 for members, and to $844 from $1,350 for customers.

Margins for the Henry Hub swing swap futures contract 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 members.

Contact: Brenda Guzman, 212-299-2436

Corporate Communications

+1 312 930 3434
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