Self-Regulatory Organizations; Investors Exchange LLC; Notice of Filing and Immediate Effectiveness of Proposed Rule Change To Amend Supplementary Material .04 and .05 to IEX Rule 23.150(h) To Change Three of the Variables in the Options Risk Parameter Quote Instability Calculation, Each Within the Permitted Ranges Specified Therein

From Federal Register — all agencies (federalregister.gov). First seen Oct 10, 2026.

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