The Polish Financial Supervision Commission published an update from the Steering Committee of the National Working Group on benchmark reform confirming that official determination of the POLSTR (Polish Short Term Rate) Interest Rate Index and indices from the POLSTR Compound Indices Family began on 2 June 2025. The Steering Committee has selected POLSTR as the recommended interest rate benchmark to replace WIBOR in the event of a cessation of its provision and considers the conditions for supervised entities to use POLSTR and the compound indices in financial contracts, financial instruments and investment funds to be met. GPW Benchmark SA is the administrator of POLSTR, authorised by the Polish Financial Supervision Commission and registered as a benchmark administrator with the European Securities and Markets Authority, and has published the required regulatory documentation under the Benchmark Regulation. POLSTR is a volume-weighted average overnight PLN deposit rate from unsecured wholesale money market transactions and is published on the next business day on a backward-looking basis; the Administrator also determines POLSTR 1M, 3M and 6M compound rates and a POLSTR Compound Index (starting 4 January 2021 at 100 points). GPW Benchmark SA has provided pre-production history from 4 January 2021 and a simulated history back to 2019 to support calculation of a credit adjustment spread based on the five-year median difference between the replaced and replacement benchmark if WIBID and WIBOR Reference Rates cease.

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