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Data from the InterContinental Exchange on Monday showed investors increased their net long position by 25,276 contracts to 477,861 lots in the week to Dec 13. That exceeds the previous record of 452,585 lots seen the previous week.
OPEC and non-OPEC producers reached their first deal since 2001 to curtail oil output jointly and ease a global glut on Dec 10. Saudi Arabia and its Gulf allies have already started cutting January supplies to customers.