2026-22847NoticeWallet

Exchange Auction Rules Get Longer Name Than Anyone Could Need

Published Date: 11/10/2026

Notice

Summary

The Cboe BYX Exchange wants to add a new optional rule for special auction orders that lets traders cancel if the auction doesn’t happen. They also want to tweak how these auctions work to support this change. The SEC is taking extra time to decide if this is a good idea, so traders and market watchers should stay tuned for updates.

Analyzed Economic Effects

3 provisions identified: 3 benefits, 0 costs, 0 mixed.

Optional Contingent Instruction Added

The exchange proposed a new optional "Contingent Instruction" that could be attached to Periodic Auction Only Orders. You (as a trader or trading firm) could send those special auction orders with this conditional instruction when using BYX's periodic auctions.

New Time‑in‑Force: Auction or Cancel

The exchange proposed a new time‑in‑force called "Auction or Cancel." Under this option, an order is to be canceled if the periodic auction does not occur, rather than remaining on the book.

Changes to Periodic Auction Processing

The exchange proposed conforming changes to how its periodic auctions are processed so they support the new Contingent Instruction and the Auction or Cancel time‑in‑force. These processing changes are intended to enable the new order behaviors on BYX.

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Key Dates

Published Date
11/10/2026

Department and Agencies

Department
Independent Agency
Agency
Securities and Exchange Commission
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