In Q4'25, Eaton's (ETN) total operating expenses reached $1.233B USD, comprising $203M USD in R&D expenses and $1.030B USD in SG&A expenses, reflecting a stable close to the fiscal year with SG&A driving the majority of costs. Over the period from Q1'23 to Q4'25, total operating expenses exhibited moderate growth from $1.083B USD to $1.233B USD, with an overall upward trend driven primarily by rising SG&A expenses, which increased from $904M USD to $1.030B USD amid fluctuations peaking at $1.149B USD in Q2'25. R&D expenses showed relative stability, ranging between $179M USD and $207M USD with minor quarterly variations, while the stacked bar chart highlights SG&A's dominant contribution (averaging over 80% of totals) and no significant inflection points beyond seasonal upticks in Q3 and Q4 periods.