Cboe EDGX adds complex-options auctions to its missed-liquidity analytics proposal

Cboe EDGX Options has filed an enhancement to its Missed Liquidity Report that would let subscribing exchange members examine orders and quotes in two complex-options auction mechanisms. The Securities and Exchange Commission published notice of filing SR-CboeEDGX-2026-073 on 30 October 2026 after Cboe submitted the change on 21 October. This is a defined change to an existing diagnostic product rather than a new trade-execution venue or a promise that a new market-data stream is available immediately.[1][2]

Cboe proposes to bring Complex Order Auction, or COA, events and Complex Automated Improvement Mechanism, or C-AIM, events into the report. These auctions can execute complex options strategies against other eligible interest, sometimes at more than one price level. The enhanced report would include a price field showing the subscriber's relevant order, quote and modification prices alongside the levels at which executions occurred during the auction. That information should help a trading desk separate missed executions attributable to price from those potentially attributable to submission timing.[1]

The existing Missed Liquidity Report is a timestamp-based post-trade tool. It records when a subscribing member attempted to access liquidity around an execution involving resting orders and quotes. The exchange describes time windows determined by Cboe, capped at one millisecond after and 100 microseconds before the initial execution attempt. Those bounds describe eligibility for a diagnostic record; they should not be read as guaranteed exchange latency or a service-level promise for every customer order.[1]

Cboe EDGX filing: scope and operational status

The report is neither a consolidated tape nor a way to inspect competitors' identifiable orders. The filing says information is supplied to each subscribing member about its own activity, with other participants protected from identification. Data are historical, generally supplied on the following trading day. A broker can therefore use them to study execution tactics, venue responsiveness and algorithm configuration after the fact, but cannot use this subscription as a live trading signal or assume it provides every detail about the resting counterparty.[1]

Cboe says the proposed report change will not alter its separate Missed Cancels or All Cancels reports. It is not seeking an immediate increase in the timestamping-service fees in this filing, although a separate fee submission is contemplated. The enhancement was filed under a procedure permitting immediate effectiveness, but with a normal 30-day operative delay unless reduced and the SEC's ability to suspend the rule. Cboe says it will announce a rollout date no later than 60 days after the operative date; no final launch date is established by the notice itself.[1]

Cboe's EDGX docket lists the missed-liquidity enhancement separately from filing SR-CboeEDGX-2026-074, which concerns a Trade-by-Trade Report. For an options broker, the difference is functional: one proposes analytics on liquidity opportunities and auctions that were not captured; the other relates to a granular transaction report and its fees. A subscriber must review the definition of missed liquidity, auction matching conditions, data delays and entitlement costs before assuming either product will improve its execution quality.[3]

The practical question for options brokers and liquidity providers is whether the added auction diagnostics improve their analysis of order quality enough to justify another post-trade data subscription. Timestamps alone may show that an execution was missed, while combined auction pricing adds context for why. That is a useful, testable improvement in market transparency, but the filing presents expected utility rather than independently measured changes in execution quality, fill ratios or client outcomes.[1]

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