MIAX Clarifies Earnings-Day Options Expirations Again
Published Date: 5/19/2026
Notice
Summary
Miami International Securities Exchange (MIAX) is updating its Short Term Option Series rules to clear up how Monday and Wednesday options work when a company announces earnings after the market closes. This change helps traders understand option expirations better and keeps things running smoothly. The update is effective immediately, so options traders should take note right away!
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Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
No Mon/Wed Short-Term Listings Before After-Hours Earnings
For Qualifying Securities, the Exchange will not list a Monday or Wednesday short-term option expiration on any day when an Earnings Announcement is scheduled to occur after the market close. "Earnings Announcement" means official public quarterly or yearly earnings filed with the Securities and Exchange Commission.
Delist or Mark Expirations Closing-Only After After-Hours Earnings
If a Monday or Wednesday short-term option expiration for a Qualifying Security is listed and an Earnings Announcement is then made after the listing becomes available for trading, the Exchange will either delist that expiration if there is no open interest or, if there is open interest, designate that expiration as closing-only. This rule was filed on May 6, 2026 and is effective upon filing.
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