In Q4'25, Amazon's total operating expenses reached $46.37B USD, with R&D expenses at $29.40B USD and SG&A expenses at $16.97B USD, marking a notable increase from the prior quarter and reflecting heightened investments in innovation and administrative functions. Over the period from Q1'23 to Q4'25, operating expenses exhibited a steady upward trend, growing from approximately $33.65B USD to $46.37B USD, driven primarily by R&D which surged from $20.45B USD to $29.40B USD amid expanding tech initiatives, while SG&A fluctuated between $12.39B USD and $16.97B USD with seasonal peaks in Q4. Key inflection points include a sharp R&D acceleration starting in Q2'25, contributing to overall volatility in the stacked bar chart, underscoring Amazon's focus on long-term growth despite rising costs.