Dear all, we are happy to announce the forthcoming fourth edition of the conference: The Mathematics of Subjective Probability - MSP2025 that will be hosted by the University of Milano-Bicocca on the days 8, 9 and 10 September 2025. The workshop, jointly organized by the three Departments of Economics, Statistics and Mathematics of Milano-Bicocca, is divided into three thematic areas, one for each day: Theory of decisions, Bayesian nonparametrics and Stochastic analysis. Keynote speakers will be: Florian BRANDL Simone CERREIA-VIOGLIO Eugenio REGAZZINI Antonio LIJOI Iliya CHEVIREV Giuseppe CANIZZARO Participation is free but registration is mandatory. Further details are available at the conference website: https://msp.campus.unimib.it/program. We look forward to seeing you in Milan. ------------------------------------- The Organizing Committee Stergios Athanasoglou Francesco Caravenna Gianluca Cassese Andrea Ongaro Pietro Rigo Barbara Vantaggi -------------------------------------