The Steering Committee of Poland’s National Working Group for benchmark reform, operating under the Polish Financial Supervision Commission (KNF), reported that the POLSTR Interest Rate Index was applied for the first time in the domestic financial market on 1 September 2025 and has obtained benchmark status under the EU Benchmark Regulation. GPW Benchmark SA implemented a methodology change for the WIG20TRsht, WIG20TRlev, mWIG40TRsh and mWIG40TRlv strategy indices from the same date, replacing WIRON with POLSTR in the calculation methodology as part of actions to implement the benchmark reform roadmap.
Polish Financial Supervision Commission (KNF) 2025-09-02
Polish Financial Supervision Commission benchmark reform group reports first domestic use of POLSTR and replacement of WIRON in selected GPW strategy indices
Poland’s National Working Group for benchmark reform, under the Polish Financial Supervision Commission (KNF), announced the first use of the POLSTR Interest Rate Index in the domestic financial market on 1 September 2025, achieving benchmark status under the EU Benchmark Regulation. GPW Benchmark SA also updated the calculation methodology for several strategy indices, replacing WIRON with POLSTR, in line with the benchmark reform roadmap.