# Federal Register #SR-IEX-2026-36

IEX Proposal to Update Options Risk Parameter Settings

**Buyer:** Securities and Exchange Commission
**Posted:** October 06, 2026
**Respond By:** October 27, 2026
**Identifier:** SR-IEX-2026-36
**NAICS:** 523210

The Securities and Exchange Commission (SEC) notice concerns a proposed rule change by Investors Exchange LLC (IEX), not a government purchase.

### Description

Investors Exchange LLC proposes to amend Supplementary Materials .04 and .05 to IEX Rule 23.150(h), changing three variables in the Options Risk Parameter quote instability calculation within their specified ranges. The proposed values are a Delta Bound Band of 0.30–1.00, a Quote Instability Threshold of 0.5%, and an implied volatility calculation frequency of once each minute of System operation. The changes are intended to optimize application of the Options Risk Parameter for the planned IEX Options launch, currently scheduled for October 2, 2026. The SEC notice invites comments on the proposed rule change by October 27, 2026.

[View original listing](https://www.federalregister.gov/documents/2026/10/06/2026-20401/self-regulatory-organizations-investors-exchange-llc-notice-of-filing-and-immediate-effectiveness-of)