In Q4'25, SIRI's operating expenses totaled approximately 513M USD, with SG&A Expenses comprising the majority at 441M USD and R&D Expenses contributing 72M USD. This marks a slight increase from Q3'25's 474M USD total, driven primarily by a 7% rise in R&D Expenses, while SG&A remained stable. Over the period from Q1'23 to Q4'25, total operating expenses exhibited a mild downward trend, declining from a peak of 548M USD in Q2'23 to 513M USD in Q4'25, reflecting consistent reductions in both R&D (from 83M USD to 72M USD) and SG&A (from 470M USD to 441M USD). Notable fluctuations include a dip in R&D to 56M USD in Q2'25, followed by recovery, and periodic volatility in SG&A around 430M-470M USD, suggesting ongoing cost optimization efforts amid stable quarterly patterns in this stacked bar chart.