The PDF file includes:

• Table S1. Tidal corrections used with the Lagrangian framework to calculate ice shelf melt rate, derived using the CATS tidal model at the time of passage of the TDX satellites.
• Fig. S1. CSK DInSAR data over the main trunk of Thwaites Glacier.
• Fig. S2. CSK DInSAR data of the TEIS.
• Fig. S3. Speed map over Thwaites Glacier.
• Fig. S4. TDX surface deformation accuracy analysis.
• Fig. S5.TDX inferred thickness change accuracy analysis.
• Fig. S6. Relationship between ice shelf melt rate and the ice shelf draft slope.
• Fig. S7. Annual ice shelf melt rates.
• Legends for movies S1 and S2

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Other Supplementary Material for this manuscript includes the following:

• Movie S1 (.mov format). TDX time series of surface elevation.
• Movie S2 (.mov format). TDX time series of changes in height above flotation.