In Q1'26, Bank of America's total operating expenses reached $17.48B USD, comprising $15.48B USD in SG&A expenses and $2.02B USD in R&D expenses, marking a notable uptick from prior periods where R&D was negligible at $0. Over the period from Q2'23 to Q1'26, SG&A expenses exhibited relative stability with minor fluctuations, ranging from a low of $13.28B USD in Q3'23 to a high of $15.48B USD in Q1'26, while R&D expenses remained at $0 across all quarters until the sudden emergence of $2.02B USD in Q1'26, indicating a potential strategic shift toward research and development investments; overall, the stacked bar chart reveals a consistent expense base dominated by SG&A, with total operating costs showing gradual upward pressure in recent fiscal periods.