Listing Alert
MIAX Emerald
December 05, 2025 | 11:36 AM
MIAX Exchange Group - Options Markets - Corporate Action Alert: YieldMax MSTR Option Income Strategy ETF (MSTY)
YieldMax MSTR Option Income Strategy ETF (MSTY) has announced a reverse stock split effective for Monday, December 8, 2025. On this date, the current MSTY option class will change to MSTY1. MSTY1 options will be available for trading on the MIAX Sapphire Options Exchange on Monday, December 8, 2025.
The MIAX Options Exchange, MIAX Pearl Options Exchange, and MIAX Emerald Options Exchange WILL NOT list MSTY1 options.
No options on the underlying MSTY will be available for trading on the MIAX Options Exchange, MIAX Pearl Options Exchange, MIAX Emerald Options Exchange and MIAX Sapphire Exchange on Monday, December 8, 2025 and will resume trading on Tuesday, December 9, 2025.
All GTC orders resting on the MIAX order books in MSTY will be canceled at the close of business on Friday, December 5, 2025.
Market Makers can use the Member Firm Portal (MFP) to manage their option class assignments. Please note that MSTY should be used for class assignments in MSTY1 via MFP.
Additional details about the YieldMax MSTR Option Income Strategy ETF (MSTY) reverse stock split are provided in the attached OCC Memo.
Please contact MIAX Listings with any questions at Listings@miaxglobal.com or (609) 897-7308.