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Upper endpoint estimates and extrapolation for commutators. Li, Kangwei Ombrosi, Sheldy J. Rivera Ríos, Israel P. Análisis funcional Política de acceso abierto: https://inmabb.criba.edu.ar/revuma/ In this note we revisit the upper endpoint estimates for commutators following the line by Harboure, Segovia, and Torrea [Illinois J. Math. 41 no. 4 (1997), 676–700]. Relying upon the suitable BMO subspace suited for the commutator that was introduced in Accomazzo’s PhD thesis (2020), we obtain a counterpart for commutators of the upper endpoint extrapolation result by Harboure, Mac´ıas and Segovia [Amer. J. Math. 110 no. 3 (1988), 383–397]. Multilinear counterparts are provided as well. 2024-12-11T07:53:24Z 2024-12-11T07:53:24Z 2023 journal article Rev. Un. Mat. Argentina 66, (2023), no. 1, 213–228 https://hdl.handle.net/10630/35571 10.33044/revuma.4362 eng http://creativecommons.org/licenses/by/4.0/ open access Attribution 4.0 Internacional Instituto de Matemática de Bahía Blanca (CONICET - UNS)