🔵 IEX Competitive Intel
Cboe BYX is expanding its Retail Price Improvement (RPI) Program to allow Retail Member Organizations (RMOs) to submit retail orders in a principal capacity — meaning the broker can trade against its customer's order using its own capital and then pass along additional price improvement beyond what the exchange execution delivered. Previously, RMOs could only submit retail orders as agent or riskless principal (where the customer gets the exact same price as the exchange execution). This change is effectively already live: it was filed as immediately effective, and the SEC waived the normal 30-day waiting period, meaning BYX's RMOs can start using this capacity right away. The practical effect is that more retail order flow may migrate onto BYX's lit exchange rather than being internalized off-exchange by wholesalers, as brokers now have a mechanism to execute on-exchange and still provide competitive post-execution price improvement to their customers.
IEX RELEVANT IEX operates its own Retail Price Improvement Program (Rule 11.232), putting it in direct competition with BYX for retail order flow. By allowing principal-capacity retail orders, BYX gives RMOs more flexibility to route retail flow to the exchange while still meeting their best-execution and price improvement obligations — potentially making BYX more attractive relative to IEX for retail-focused brokers. This follows the same rule change already approved at Cboe's sister exchange EDGX, meaning Cboe is systematically rolling out this capability across its exchange group. If retail brokers increasingly use this mechanism on BYX/EDGX, IEX may need to consider whether its own retail program rules need updating to remain competitive for retail order flow. However, the filing also notes IEX's retail program by name as a comparable, suggesting IEX is already viewed as a relevant competitor in this space.
IEX is adding a new optional handling instruction to its D-Limit order type, giving members the choice of whether their incoming D-Limit orders get automatically price-adjusted when the Crumbling Quote Indicator (CQI) is active on entry. Previously, all D-Limit orders arriving during quote instability were automatically stepped back one tick from the CQI price; now, members can instead elect to have those orders post or execute at their stated limit price on entry (behaving like a regular limit order), while still being subject to CQI-driven price adjustment once resting. This filed as 'immediately effective' — a streamlined procedural path for non-controversial changes — meaning it is already in effect with a 90-day implementation window, though the SEC retains a 60-day window to summarily suspend it if concerns arise. In practice, this gives IEX members more control and flexibility over D-Limit order behavior, which IEX hopes will attract more liquidity to the exchange.
IEX RELEVANT This filing directly enhances IEX's flagship D-Limit order type, one of IEX's core competitive differentiators. By giving members the option to bypass the on-entry price adjustment (while retaining CQI protection once resting), IEX is responding to member feedback and making D-Limit more usable for a broader range of trading strategies. This could increase D-Limit order flow and liquidity on IEX, strengthening its competitive position. However, the change subtly softens the strict anti-latency-arbitrage posture of D-Limit on entry, which could be a minor dilution of IEX's 'investor protection' narrative — though IEX is careful to frame it as additive optionality rather than a rollback of core protections.