The Bloomberg index team has announced a change to the UBS Bloomberg Constant Maturity Commodity Index (CMCI) business day convention. Effective December 15, 2017, index values will be published when pricing data for a minimum of 50% of the index constituents by target weight are available. Prior to the effective date, index values were published when pricing data for a minimum of 80% of the index constituents by target weight were available.

See section 3.6 of the UBS Bloomberg CMCI technical document

Please contact commodities@bloombergindices.com for more information.