**Low global seismic activity in the September 21–27 window underpins the strong market consensus favoring ≤6 events of magnitude 5.5 or greater.** Official USGS and EMSC catalogs show only a handful of qualifying quakes through September 25, including an M5.5 in Indonesia on the 21st and an M5.7 near Tonga on the 23rd, with subsequent activity limited to M5.0–5.3 events in Papua New Guinea, Turkey, Vanuatu, and Chile. This pace aligns with background rates rather than any swarm, aftershock sequence, or elevated tectonic stress release. No large-magnitude triggers or notable model signals point to a sudden uptick in the final two days. Traders therefore price the lower outcome bins heavily, reflecting the absence of conditions that historically produce weekly totals above the mid-single digits.