Refined Products, Diesel-Gasoil

March 28, 2025

Platts to discontinue Seattle ULSD differential, relaunch under a new pricing basis, symbol

Platts, part of S&P Global Commodity Insights, will discontinue the Seattle ULSD differential, priced against Portland ULSD, and launch a new assessment to price against NYMEX ULSD futures, effective April 23.

The current Seattle ULSD differential assessment is priced as a spread to the Portland ULSD assessment but is described in Platts' publications as a differential to the NYMEX ULSD futures contract.

Platts will discontinue the current Seattle ULSD differential assessment and launch a new one priced as a differential to the NYMEX ULSD futures contract.

Platt will backfill the new Seattle ULSD assessment to the date the original price was launched, using the NYMEX ULSD futures as its basis.

The change was proposed in a subscriber note (opens in a new tab)published March 11.

The following assessments will be discontinued as a result of this change:

AssessmentsSymbols
Seattle Ultra Low Sulfur (EPA) Diesel Differential to NYMEXADLAH00
Seattle Ultra Low Sulfur (EPA) Diesel Differential to NYMEX MAvgACLAH00

The following assessments will be launched, effective Apr 23:

AssessmentsSymbols
Seattle ULS (EPA) Diesel Differential to NYMEX cents/galASULD00
Seattle ULS (EPA) Diesel Differential to NYMEX cents/gal MAvgASULD03

The Seattle ULSD assessment is published on pages PGA0481, PRF0481, PGA0158, PRF0158, PGA0450, PRF0450, PGA0451, PRF045, Oilgram Price Report, US Market Wire, and in the Platts price database under the symbol listed above.

Please send any comments or questions to americas_products@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.