Platts updates Mexico rebar assessment, index specifications; increases index frequency

Platts, part of S&P Global Commodity Insights, has updated the quality specifications of its weekly Rebar Mexico Domestic Production Delivered price assessment and its Rebar Mexico Domestic Production Delivered Index, effective Aug. 1, 2025.

Platts has also increased the frequency of its calculated monthly Rebar Mexico Domestic Production Delivered Index to weekly from monthly, effective Aug. 1.

The changes were proposed in a subscriber note published May 30. Following feedback, Platts published a subscriber note confirming the proposed changes on June 27.

Specifications

Platts has updated the quality specification for both the assessment and index to NMX B-506 grade 42, from NMX C-407 grade 42 previously. The change aligns the specification to the quality standard set by Canacero, the Mexican iron and steel chamber, and market feedback.

Additionally, Platts clarified that the incoterm reflected in both the assessment and index is Delivered at Place.

All other specifications for the assessment and index remain the same.

Index publication frequency

The Rebar Mexico Domestic Production Delivered Index tracks the percentage base value change in the monthly average of Platts Rebar Mexico Domestic Production Delivered price assessment. It had been published on the first day of each month and now will be published each Friday, tracking the percentage-based value change weekly.

The Rebar Mexico Domestic Production Delivered assessment will continue to be published weekly on Fridays.

The change in the index's cadence responds to market feedback that a weekly base value change index better reflects more frequent domestic buying and selling activity.

The updates to the assessment and index are as follows:

Platts has also launched monthly averages for both the Mexico rebar assessment and index, effective August 2025. The first calculations will reflect the monthly average of weekly prices published during the month of August.

The new monthly average symbols are as follows:

Platts' full ferrous methodology and specifications guide can be found here.

The above assessments are published on pages STL1315 and PMA1315 of Platts Ferrous Metals Alert, Steel Price Report, Steel Business Briefing, and in the Platts price database under the symbols listed above.

Please send comments and questions to LatAmMetalsteam@spglobal.com and pricegroup@spglobal.com.

For written comments, please provide a clear indication if comments are not intended for publication by Platts for public viewing. Platts will consider all comments received and will make comments not marked as confidential available upon request.