In Q1'26, ABNB's operating expenses reached $1.68B USD, with R&D expenses at $638M USD and SG&A expenses at $1.05B USD, marking a sequential increase from Q4'25's total of $1.69B USD driven primarily by higher R&D investments. From Q2'23 to Q1'26, total operating expenses exhibited an overall upward trend, rising from $1.21B USD to $1.68B USD, with R&D expenses showing consistent growth from $451M USD to $638M USD and occasional quarterly fluctuations, while SG&A expenses grew from $761M USD to $1.05B USD but displayed volatility, including a sharp spike to $1.63B USD in Q4'23 and $1.11B USD in Q4'25. This pattern highlights escalating cost pressures, particularly in R&D, amid stable but uneven SG&A dynamics in a stacked bar visualization.