Please note that starting with the April-2020 calendar month expiries, TTF and NBP options will expire at 13:00 London time. Please see the related SER

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UK NBP Natural Gas Calendar Month Futures Contract Specs

Contract Unit 1,000 therms x number of days in the contract month
Price Quotation British pence per therm (1 GBP = 100 pence)
Trading Hours Sunday - Friday 5:00 p.m. - 4:00 p.m. (6:00 p.m. - 5:00 p.m. ET) with a 60-minute break each day beginning at 4:00 p.m. (5:00 p.m. ET)
Minimum Price Fluctuation 0.005 pence per therm x # of days in the contract month = £1.40 - £1.55
Product Code CME Globex: UKG
CME ClearPort: UKG
Clearing: UKG
Listed Contracts Monthly contracts listed for the current year and the next 5 calendar years. List monthly contracts for a new calendar year following the termination of trading in the December contract of the current year.
Settlement Method Deliverable
Termination Of Trading Trading terminates at 5:00 p.m. London time on the second last London business day of the month prior to the contract month. If this is not a U.S. business day, trading terminates on the prior U.S. and London business day. 
Position Limits NYMEX Position Limits
Exchange Rulebook NYMEX 1157
Block Minimum Block Minimum Thresholds
Price Limit Or Circuit Price Limits
Vendor Codes Quote Vendor Symbols Listing