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We confirm TOI-4201 b as a transiting Jovian mass planet orbiting an early Mdwarf discovered by the Transiting Exoplanet Survey Satellite. Using groundbased photometry and precise radial velocities from NEID and the Planet FinderSpectrograph, we measure a planet mass of 2.59$^{+0.07}_{-0.06}$ M$_{J}$,making this one of the most massive planets transiting an M-dwarf. The planetis $\sim$0.4\% the mass of its 0.63 M$_{\odot}$ host and may have a heavyelement mass comparable to the total dust mass contained in a typical Class IIdisk. TOI-4201 b stretches our understanding of core-accretion during theprotoplanetary phase, and the disk mass budget, necessitating giant planetformation to either take place much earlier in the disk lifetime, or perhapsthrough alternative mechanisms like gravitational instability.

TOI-4201: An Early M-dwarf Hosting a Massive Transiting Jupiter Stretching Theories of Core-Accretion