The SEC’s May 5, 2026 proposal to introduce optional semiannual reporting on a new Form 10-S, rather than mandating quarterly Form 10-Q filings, represents the central catalyst behind the 67% market-implied probability that the quarterly requirement will not be fully removed. While the rule would permit companies to elect semiannual interim reporting—potentially easing compliance costs and short-term pressures—it remains subject to a 60-day public comment period, subsequent Commission adoption, and possible modifications that could preserve elements of quarterly disclosure. This measured approach aligns with broader efforts to modernize disclosure rules and reduce regulatory burdens, yet the extended timeline and optionality temper expectations for a complete shift away from the current regime. Traders appear to price in the realistic prospect that final implementation may fall short of outright elimination, consistent with historical patterns of incremental SEC rulemaking.