In Q1'26, Fortinet's (FTNT) operating expenses reached a total of $906.5M USD, with R&D expenses at $214M USD and SG&A expenses at $692.5M USD, marking a slight sequential increase from Q4'25's $891.6M USD total. Over the period from Q2'23 to Q1'26, total operating expenses exhibited a steady upward trend, rising from $719.1M USD to $906.5M USD, driven primarily by growth in SG&A expenses (from $565.8M USD to $692.5M USD) and consistent increases in R&D (from $153.3M USD to $214M USD), with minor fluctuations such as a dip in R&D during Q4'23 and accelerated SG&A growth post-Q2'25, reflecting expanded operational scale in a quarterly bar chart format.