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Frequently Asked Questions
 What are the opening quote obligations for Primary/Lead Market Makers?
Identification Number 1910

Lead Market Makers (LMMs) and Primary Market Makers (PMMs) on Phlx, ISE, GEMX and MRX must enter a Valid Width Quote in at least 90% of their assigned series no later than one minute following the dissemination of a quote or trade by the market for the underlying security. For index options, the one-minute window starts following the receipt of the opening price in the underlying index.

The remainder of the assigned series must be opened "promptly". PMMs and LMMS are required to open all of their assigned series each trading day and following any trading halts for an assigned symbol on Phlx, ISE, GEMX and MRX.

Please see PHLX/ISE/MRX/GEMX Options 3, Section 8 for more details.

Publication Date*: 6/30/2026 Mailto Link Identification Number: 1910
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