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Natural Gas (Henry Hub) Last-day Financial Futures Contract Specs

Code HH
Venue CME Globex, CME ClearPort, Open Outcry (New York)
(All Times are New York Time/ET)
CME Globex: Sunday - Friday 6:00 p.m. - 5:15 p.m. (5:00 p.m. - 4:15 p.m. Chicago Time/CT) with a 45-minute break each day beginning at 5:15 p.m. (4:15 p.m. CT) 
CME ClearPort: Sunday - Friday 6:00 p.m. - 5:15 p.m. New York time/ET (5:00 p.m. - 4:15 p.m. Chicago Time/CT) with a 45-minute break each day beginning at 5:15 p.m. (4:15 p.m. CT)
Open Outcry: Monday - Friday 9:00 a.m. - 2:30 p.m. (8:00 a.m. - 1:30 p.m. CT)
Contract Unit 10,000 million British thermal units (mmBtu).
Price Quotation U.S. dollars and cents per mmBtu.
Minimum Fluctuation $0.001 per mmBtu
Maximum Daily Price Fluctuation Trading halts and price limits for this contract are subject to the provisions governing Special Price Fluctuation Limits for Henry Hub Natural Gas Futures set forth in Chapter 220.
Floating Price The Floating Price for each contract month will be equal to the NYMEX (Henry Hub) Natural Gas
Futures contract final settlement price for the corresponding contract month on the last trading day
for that contract month.
Termination of Trading Trading shall cease on the third business day prior to the contract month.
Listed Contracts The current year and the next five years. A new calendar year will be added following the termination of trading in the December contract of the current year.
Trading at Settlement (TAS) Trading at settlement is available for spot (except on the last trading day), 2nd and 3rd months and subject to the existing TAS rules. Trading in all TAS products will cease daily at 2:30 PM Eastern Time. The TAS products will trade off of a "Base Price" of 0 to create a differential (plus or minus 10 ticks) versus settlement in the underlying product on a 1 to 1 basis. A trade done at the Base Price of 0 will correspond to a "traditional" TAS trade which will clear exactly at the final settlement price of the day.
Settlement Type Financial
Settlement Procedure Daily NYMEX Henry Hub Futures Settlement Procedure (PDF)
Final NYMEX Henry Hub Natural Gas Look-Alike Last Day Financial Futures Settlement Procedure (PDF)
Final Settlement Delivery under the NYMEX Henry Hub contract shall be by cash settlement. Final settlement, following termination of trading for a contract month, will be based on the Floating Price. The final settlement price will be the Floating Price calculated for each contract month
Position Limits NYMEX Position Limits
Rulebook Chapter 823
Exchange Rule These contracts are listed with, and subject to, the rules and regulations of NYMEX.