This work presents a systematic study of the impact of neon seeding on pedestal performance and stability in JET-ITER baseline scenario discharges in deuterium at high input power, extending previous JET impurity seeding experiments. A neon-seeding scan of the JET-ITER baseline at = 2.5 MA, = 2.7 T, q95 = 3.2 with high triangularity is studied with a neon pedestal concentration up to 1.7% at the pedestal top. As is typical in these discharges, the global confinement is increased approaching unity and the parameter reaches up to 2.3 with the increased radiation fraction. A detailed pedestal profile analysis showed that neon seeding reduces the pedestal density while substantially increasing both the electron and ion pedestal temperatures, resulting in an overall ∼50% increase in pedestal pressure compared to unseeded plasmas. Simultaneously, the total pressure pedestal width broadens, mostly due to the increased width ( broadening has a negligible impact on the total pressure width). The total pressure gradient develops in a way that stabilizes the pedestal against ideal peeling–ballooning (PB) modes. Ideal magnetohydrodynamics (MHD) stability calculations confirm that unseeded pedestals lie close to the PB boundary, while neon-seeded cases move deep into the PB stable domain, consistent with the observed transition to small or no edge-localized mode (ELM) operation. Comparison with the Europed predictions exhibits good qualitative agreement in pedestal height trends, though systematic offsets and the underestimation of pedestal widths highlight the limitations of the current model.