The 83.5% market-implied probability that the SEC will not remove mandatory quarterly reporting reflects record investor opposition to the May 2026 proposal for optional semiannual filings on Form 10-S. Over 280,000 comments, the vast majority against the change, cite risks to market transparency, timely price discovery, and efficient capital allocation, with hedge funds and institutions emphasizing widened information asymmetry. Although Chairman Paul Atkins and the Trump administration continue to advance the elective framework as a cost-reduction measure for issuers, the proposal remains far from final adoption, with staff review ongoing and earliest implementation likely in 2027 or later. Current Exchange Act rules still require Form 10-Q filings, and any final rule would need to address stakeholder critiques to withstand potential challenges.