In Q1'26, LYFT's total operating expenses reached $667.3M USD, comprising $124.2M USD in R&D expenses and $543.2M USD in SG&A expenses, marking a slight quarterly increase from Q4'25's $682.8M USD total. From Q2'23 to Q1'26, R&D expenses exhibited a volatile downward trend, peaking at $154.6M USD in Q2'23 before stabilizing around $100M-$120M USD, with a recent uptick to $124.2M USD; in contrast, SG&A expenses showed consistent growth from $310.6M USD to $543.2M USD, driving the overall operating expenses upward by approximately 115% over the period, though with temporary dips in Q1'25 and Q4'24. This pattern highlights escalating administrative costs amid fluctuating innovation investments, potentially signaling efficiency challenges in scaling operations.