Trader consensus favoring one or zero VEI ≥4 eruptions in 2026 reflects the low historical frequency of such events—typically one to three globally per year on the Volcanic Explosivity Index scale, which quantifies explosivity by ejecta volume starting at 0.1 km³ for VEI 4. Ongoing activity at Semeru, Krakatau, and Manam has produced ash plumes and thermal anomalies through mid-October, yet confirmed reports from the Smithsonian Global Volcanism Program and national observatories indicate mostly VEI 2–3 events, with Krakatau’s September explosive phase representing the clearest candidate for a VEI 4 classification. Model consensus and satellite data show no rapid intensification toward larger magnitudes, and the absence of multiple high-volume tephra deposits or widespread impacts supports the market-implied odds while underscoring uncertainty from evolving seismic and gas monitoring through year-end.