In Q4'25, LYFT's operating expenses reached $682.8M USD, comprising $120.0M USD in R&D expenses and $562.8M USD in SG&A expenses, marking a notable increase from prior quarters driven primarily by escalating SG&A costs. Over the period from Q1'23 to Q4'25, total operating expenses exhibited an overall upward trend, rising from $569.4M USD to $682.8M USD, with SG&A expenses showing consistent growth from $372.5M USD to $562.8M USD amid expanding operations, while R&D expenses declined sharply from $196.9M USD in Q1'23 to around $110M USD by Q3'25 before a slight rebound to $120.0M USD in Q4'25, reflecting potential cost optimization efforts in innovation spending.