IEX Tinkers with Options Quote Instability Risk Variables
Published Date: 10/6/2026
Notice
Summary
Investors Exchange (IEX) is tweaking three numbers in how it measures risk for options trading quotes. These changes stay within allowed limits and aim to keep trading fair and smooth. The update took effect right away on September 23, 2026, and mainly affects traders and firms using IEX’s options market.
Analyzed Economic Effects
4 provisions identified: 3 benefits, 1 costs, 0 mixed.
Delta Bound Band raised to 0.30–1.00
If you are a Market Maker on IEX Options that elects the Options Risk Parameter (ORP), IEX changed the Delta Bound Band from the prior 0–1 initial value to a proposed 0.30–1.00 range. This change became effective upon filing on September 23, 2026 and will be operative for IEX Options launch scheduled to begin on October 2, 2026.
Quote Instability Threshold set to 0.5%
IEX changed the Quote Instability Threshold from the initial 0.1% to a proposed 0.5%. The filing explains the threshold range is 0%–100% and that this change is part of more conservative settings for IEX Options, effective upon filing on September 23, 2026 and operative for the IEX Options launch on October 2, 2026.
Implied Volatility calculated every 1 minute
IEX will change the frequency for calculating implied volatility (used to calculate Delta) from each half-hour of System operation to once every one minute of System operation. This modification is part of the three variable changes made effective upon filing on September 23, 2026 and is operative for the IEX Options launch scheduled to begin on October 2, 2026.
ORP can reprice or cancel Market Maker quotes
If a Market Maker elects to have its quotations subject to the Options Risk Parameter (ORP), and the quote instability calculation generates a determination, the Market Maker's quote that is above (or below) the price level of the determination will be either cancelled or repriced as instructed by the Market Maker. This ORP operation and its administration (including the three variable changes) became effective upon filing on September 23, 2026 and will be operative for IEX Options launch on October 2, 2026.
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