This dataset provides annual homogenised values of glacier surface area and mass balance for the Stubacher Sonnblickkees glacier in the Hohe Tauern, Austria, covering the period 2018–2025 with ongoing yearly updates. The values were homogenised across three independent mass balance methods: the direct (glaciological) method, the geodetic method, and the semi-direct method. Accompanying the tabular values, homogenised glacier outlines are provided as shapefiles for each year. The dataset was produced within an intercomparison exercise designed to evaluate differences between the geodetic, glaciological, and semi-direct methods for determining glacier mass balance. It supports long-term monitoring of glacier evolution in the Eastern Alps and contributes to the assessment of methodological uncertainties in mass balance observations.