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Recent advancements on the fabrication of organic micro- and nanostructures have permitted the strong collective light–matter coupling regime to be reached with molecular materials. Pioneering works in this direction have shown the effects of this regime in the excited state reactivity of molecular systems and at the same time have opened up the question of whether it is possible to introduce any modifications in the electronic ground energy landscape which could affect chemical thermodynamics and/or kinetics. In this work, we use a model system of many molecules coupled to a surface-plasmon field to gain insight on the key parameters which govern the modifications of the ground-state potential energy surface. Our findings confirm that the energetic changes per molecule are determined by effects that are essentially on the order of single-molecule light–matter couplings, in contrast with those of the …