Self-Regulatory Organizations; Cboe BYX Exchange, Inc.; Notice of Filing of Amendment No. 2 and Order Approving on an Accelerated Basis a Proposed Rule Change, as Modified by Amendment No. 2, To Make Clarifying Changes Regarding Its Periodic Auctions

On October 14, 2021, Cboe BYX Exchange, Inc. (“BYX” or “Exchange”) filed with the Securities and Exchange Commission (“Commission”), pursuant to Section 19(b)(1) of the Securities Exchange Act of 1934 (“Act”), and Rule 19b-4 thereunder, a proposed rule change to make certain clarifying changes regarding its Periodic Auctions. The proposed rule change was published for comment in the Federal Register on October 26, 2021. On January 12, 2022, the Exchange filed Amendment No. 1 to the proposed rule change. On January 14, 2022, the Exchange withdrew Amendment No. 1 and filed Amendment No. 2, which replaces in its entirety the proposal as originally submitted on October 14, 2021. The Commission received no comment letters regarding the proposal. This order approves the proposed rule change, as modified by Amendment No. 2, on an accelerated basis.

I. Self-Regulatory Organization's Statement of the Purpose of, and Statutory Basis for, the Proposed Rule Change

In its filing with the Commission, the Exchange included statements concerning the purpose of and basis for the proposed rule change and discussed any comments it received on the proposed rule change. The text of these statements may be examined at the places specified in Item IV below. The Exchange has prepared summaries, set forth in sections A, B, and C below, of the most significant aspects of such statements.

A. Self-Regulatory Organization's Statement of the Purpose of, and Statutory Basis for, the Proposed Rule Change

1. Purpose

This Amendment No. 2 to SR-CboeBYX-2021-024 amends and replaces in its entirety the proposal as originally submitted on October 14, 2021. The Exchange submits this Amendment No. 2 in order to clarify certain points and add additional details to the proposal.

The purpose of this proposed rule change is to make certain clarifying changes to Exchange Rule 11.25 related to periodic auctions for the trading of U.S. equity securities (“Periodic Auctions”). The Commission approved the Exchange's proposal to introduce Periodic Auctions on March 26, 2021. The Exchange has not yet implemented Periodic Auctions. The Exchange is submitting this proposal in order to simplify certain portions of the Periodic Auction process and to add clarity to the rule text prior to implementation.

Specifically, the Exchange is proposing that: (i) Periodic Auction Eligible Orders will be ranked as non-displayed limit orders consistent with the priority of orders outlined in Rule 11.12(a); (ii) incoming Periodic Auction Eligible Orders that are eligible both to trade on the Continuous Book and initiate a Periodic Auction against a Periodic Auction Only Order at the same price will trade immediately with the Continuous Book, and other incoming Periodic Auction Eligible Orders will upon entry interact with Continuous Book Orders and other Periodic Auction Eligible Orders according to their rank under Rule 11.12(a); and (iii) Periodic Auction Eligible Orders that are also Minimum Quantity Orders will only initiate a Periodic Auction upon entry where a single contra-side Periodic Auction Order would satisfy the specified minimum size. The Exchange is also proposing to make a simplifying change to reject Periodic Auction Orders that are immediate-or-cancel (“IOC”). Finally, the Exchange is proposing to make certain clean-up changes to Rule 11.25(b)(1), (2), and (3) to eliminate certain typos from the rule text.

Ranking Periodic Auction Eligible Orders

Rule 11.25(b)(2) currently reads as follows:

Periodic Auction Eligible Orders. A “Periodic Auction Eligible Order” is a Non-Displayed Limit Order eligible to trade on the Continuous Book that is entered with an instruction to also initiate a Periodic Auction, if possible, pursuant to this Rule 11.25. An incoming Periodic Auction Eligible Order that is eligible both to trade on the Continuous Book and initiate a Periodic Auction will trade immediately with the Continuous Book.

The first sentence makes clear that Periodic Auction Eligible Orders are eligible to trade on the Continuous Book and suggests that Periodic Auction Eligible Orders would be ranked as non-displayed limit orders by referring to such as orders as types of non-displayed limit orders. However, reading this sentence together with the second sentence could make it unclear as to how Periodic Auction Eligible Orders are ranked and how an incoming Periodic Auction Eligible Order would interact with other Periodic Auction Orders and resting orders on the Continuous Book.

As such, the Exchange is proposing to add a new sentence in between the two sentences that reads “Periodic Auction Eligible Orders will be ranked as non-displayed limit orders consistent with the priority of orders outlined in Rule 11.12(a).” This will make explicit that Periodic Auction Eligible Orders will be ranked in price-time priority among Continuous Book Orders and will also help to make clear how incoming orders (both Periodic Auction Eligible Orders and Continuous Book Orders) will interact with resting orders, as further discussed below. Practically, the Exchange believes this clarifying change is reasonably inferred from the definition of Periodic Auction Eligible Orders, which defines a Periodic Auction Eligible Order as (emphases added) “ a Non-Displayed Limit Order eligible to trade on the Continuous Book that is entered with an instruction to also initiate a Periodic Auction, if possible, pursuant to this Rule 11.25.” If such orders are eligible to trade on the Continuous Book, they would need to be prioritized by the System and it would only make sense for them to be prioritized in accordance with the Exchange's existing priority rules. Rather than rely on this implication, the Exchange is proposing to explicitly state this in the Rules by adding the language proposed above.

Example 1:

NBBO: $10.00 × $10.05

Order 1: Buy 200 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 2: Buy 100 shares @ $10.02 Displayed—Continuous Book Order

Order 3: Sell 100 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 2 is ranked ahead of Order 1 because it is a displayed limit order in accordance with Rule 11.12(a)(1), meaning that Order 3 would execute 100 shares against Order 2.

Incoming Periodic Auction Eligible Orders

As described above, Rule 11.25(b)(2) currently states that “An incoming Periodic Auction Eligible Order that is eligible both to trade on the Continuous Book and initiate a Periodic Auction will trade immediately with the Continuous Book.” This language was originally introduced to make clear that an incoming Periodic Auction Eligible Order would interact with other Periodic Auction Eligible Orders and Continuous Book Orders before interacting with Periodic Auction Only Orders, as made clear in Example 3 in the Approved Proposal (“AP Example 3”). While part of the rule is made clear by the surrounding rule text and the clarifying context from the Approved Proposal, on its own it could be read to imply that all resting Periodic Auction Eligible Orders would either be prioritized behind any executable Continuous Book Order or that such resting orders should immediately execute against an incoming Periodic Auction Eligible Order instead of initiating a Periodic Auction, which is not the case. Additionally, another example from the Approved Proposal laid out circumstances under which an incoming Periodic Auction Eligible Order that is eligible both to trade on the Continuous Book and initiate a Periodic Auction against a Periodic Auction Only Order will trade immediately with the Continuous Book, even where the Periodic Auction Only Order is more aggressively priced than the Continuous Book Order. The Exchange is proposing to add language to Rule 11.25(b)(2) in order to change the outcome of that example such that an incoming Periodic Auction Eligible Order that is eligible both to trade on the Continuous Book and initiate a Periodic Auction against a more aggressively priced Periodic Auction Only Order will initiate a Periodic Auction (the “Aggressive PAO Change”).

Specifically, the Exchange is proposing to add language to Rule 11.25(b)(2) such that it will instead read (additions in italics ): “An incoming Periodic Auction Eligible Order that is eligible both to trade on the Continuous Book and initiate a Periodic Auction against a Periodic Auction Only Order at the same price will trade immediately with the Continuous Book. Incoming Periodic Auction Eligible Orders will upon entry interact with Continuous Book Orders and other Periodic Auction Eligible Orders according to their rank under Rule 11.12(a).” This language will: (i) Make explicit in the rule text the outcome described in AP Example 3; and (ii) change the functionality from how it was described in the Approved Proposal such that an incoming Periodic Auction Eligible Order will now initiate a Periodic Auction where there is a Periodic Auction Only Order that is priced more aggressively than any other Continuous Book Orders instead of executing immediately with the most aggressively priced Continuous Book Order. Further, this proposed change will provide additional clarity to the language in Rule 11.25(c) describing when a Periodic Auction will be initiated. Specifically, Rule 11.25(c) provides that a Periodic Auction will be initiated in a security when “one or more Periodic Auction Orders to buy become executable against one or more Periodic Auction Orders to sell.” The proposed amendment to Rule 11.25(b)(2) to specifically describe how incoming Periodic Auction Eligible Orders will interact with resting orders will add clarity regarding what it means when Periodic Auction Orders become “executable” against one another in this context.

Example 2:

NBBO: $10.00 × $10.05

Order 1: Buy 200 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 2: Buy 100 shares @ $10.02 Displayed—Continuous Book Order

Order 3: Sell 400 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 3 would execute 100 shares against Order 2 (consistent with Example 1). Order 3 and Order 1 would then be executable against one another and are both Periodic Auction Eligible Orders, so the remaining 300 shares from Order 3 would be sent to the Periodic Auction Book and the Periodic Auction initiation process would begin.

Example 3:

NBBO: $10.00 × $10.05

Order 1: Buy 200 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 2: Buy 100 shares @ $10.02 Non-Displayed—Continuous Book Order

Order 3: Sell 400 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

This example is identical to Example 2 except that Order 2 is Non-Displayed rather than Displayed. Upon entry, Order 3 would be executable against Order 1 and both are Periodic Auction Eligible Orders, so the 400 shares from Order 3 would be sent to the Periodic Auction Book and the Periodic Auction initiation process would begin.

Example 4:

NBBO: $10.00 × $10.05

Order 1: Buy 200 shares @ $10.02 Non-Displayed—Periodic Auction Only

Order 2: Buy 100 shares @ $10.02 Non-Displayed—Continuous Book Order

Order 3: Sell 100 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Because an incoming Periodic Auction Eligible Order that “is eligible both to trade on the Continuous Book and initiate a Periodic Auction against a Periodic Auction Only Order at the same price will trade immediately with the Continuous Book,” Order 3 would execute 100 shares against Order 2 and a Periodic Auction would not be initiated.

Example 5:

NBBO: $10.00 × $10.05

Order 1: Buy 200 shares @ $10.03 Non-Displayed—Periodic Auction Only

Order 2: Buy 100 shares @ $10.02 Non-Displayed—Continuous Book Order

Order 3: Sell 100 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Because an incoming Periodic Auction Eligible Order that “is eligible both to trade on the Continuous Book and initiate a Periodic Auction against a Periodic Auction Only Order at the same price will trade immediately with the Continuous Book,” and Order 1 is priced more aggressively than Order 2 ( i.e., not against a Periodic Auction Only Order at the same price), the 100 shares from Order 3 would be sent to the Periodic Auction Book and the Periodic Auction initiation process would begin.

Example 6:

NBBO: $10.00 × $10.05

Order 1: Buy 200 shares @ $10.03 Non-Displayed—Periodic Auction Only

Order 2: Buy 100 shares @ $10.02 Non-Displayed—Continuous Book Order

Order 3: Sell 100 shares @ $10.03 Non-Displayed—Periodic Auction Eligible

This example is identical to Example 5 except that Order 3 has a limit of $10.03 instead of $10.02. Because the only orders that are able to execute against one another are Order 3 and Order 1, Order 3 would post and the System would check to see whether a Periodic Auction could be initiated (which it could because Order 3 and Order 1 are executable against one another), and the Periodic Auction initiation process would begin.

Periodic Auction Eligible Orders With a Minimum Quantity

Rule 11.25(b)(2)(C) describes how Minimum Quantity Orders will participate in Periodic Auctions and the use of such orders with Periodic Auction Eligible Orders, but does not address how such orders will be handled in initiating Periodic Auctions. It states that “Minimum Quantity Orders, as defined in Rule 11.9(c)(5), will be executed in a Periodic Auction only if the minimum size specified can be executed against one or more contra-side orders. Orders entered with the alternative instruction that requires the minimum size specified to be satisfied by each individual contra-side order cannot be entered as Periodic Auction Eligible Orders.”

The current rule and the Approved Proposal are clear in describing how Minimum Quantity Orders will be handled in a Periodic Auction (they “will be executed in a Periodic Auction only if the minimum size specified can be executed against one or more contra-side orders”), but as noted above they do not describe how incoming Periodic Auction Eligible Orders with minimum size requirements will be handled in initiating Periodic Auctions. Because Periodic Auction Eligible Orders are eligible to both execute against orders on the book or to initiate a Periodic Auction where they would execute against a Periodic Auction Order, an incoming order with a minimum size requirement creates unique issues related to how to calculate executable quantity and determining whether an order should be executed or initiate a Periodic Auction, especially where resting orders also have minimum size requirements. As such, the Exchange is proposing to explain how it intends to handle such orders by adding a sentence that states “A Periodic Auction Eligible Order entered with a minimum execution quantity will only initiate a Periodic Auction upon entry where a single contra-side Periodic Auction Order would satisfy the specified minimum size.” This provides a straightforward approach to managing minimum execution quantity that makes the interaction of minimum execution quantity more easily understandable and predictable while ensuring that the minimum execution quantity will be satisfied if the incoming order initiates a Periodic Auction. This proposed change is consistent with the protection of investors and the public interest as it would help to simplify the minimum execution quantity functionality. The following examples represent basic illustrations of the unique issues and explanation of how the Exchange will manage incoming Periodic Auction Eligible Orders with minimum size requirements.

Example 7:

NBBO: $10.00 × $10.05

Order 1: Buy 200 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 2: Buy 100 shares @ $10.02 Displayed—Continuous Book Order

Order 3: Buy 400 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 4: Sell 1000 shares @ $10.02 Non-Displayed—Periodic Auction Eligible; Minimum Quantity = 500

Order 4 would execute 700 shares upon entry against Orders 2, 1, and 3, and would post 300 shares. Even though there are a collective 600 shares of Periodic Auction Orders between Orders 1 and 3 (enough to satisfy the minimum size requirement for Order 4), the Periodic Auction initiation process would not occur because no single Periodic Auction Order satisfies the Minimum Quantity of 500 shares.

Example 8:

NBBO: $10.00 × $10.05

Order 1: Buy 300 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 2: Buy 500 shares @ $10.02 Non-Displayed—Continuous Book Order

Order 3: Buy 200 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 4: Sell 800 shares @ $10.02 Non-Displayed—Periodic Auction Eligible; Minimum Quantity = 500

Order 4 would execute 800 shares upon entry against Orders 1 and 2. Even though there are a collective 500 shares of Periodic Auction Orders between Orders 1 and 3 (enough to satisfy the minimum size requirement for Order 4), the Periodic Auction initiation process would not occur because no single Periodic Auction Order would satisfy the Minimum Quantity of 500 shares.

Example 9:

NBBO: $10.00 × $10.05

Order 1: Buy 500 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 2: Buy 500 shares @ $10.02 Non-Displayed—Continuous Book Order

Order 3: Buy 200 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 4: Sell 800 shares @ $10.02 Non-Displayed—Periodic Auction Eligible; Minimum Quantity = 500

The only difference between this Example 9 and Example 8 above is that Order 1 has 500 shares instead of 300. This change means that Order 1 would on its own satisfy the 500 share minimum size requirement of Order 4 and would thus be “a single contra-side Periodic Auction Order” that “would satisfy the specified minimum size” of the incoming order. As such, Order 4 would be sent to the Periodic Auction Book and the Periodic Auction initiation process would begin. Similarly, where a Periodic Auction Eligible Order with a minimum size requirement is already on the book, incoming orders that do not individually satisfy the minimum size requirements will not execute immediately. However, consistent with the Exchange's treatment of Minimum Quantity Orders generally, such orders will aggregate after posting.

Example 10:

NBBO: $10.00 × $10.05

Order 1: Buy 1000 shares @ $10.02 Non-Displayed—Periodic Auction Eligible; Minimum Quantity = 500

Order 2: Sell 400 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Order 3: Sell 400 shares @ $10.02 Non-Displayed—Periodic Auction Eligible

Orders 2 and 3 do not satisfy the minimum size requirement of Order 1 and therefore would not execute or initiate a Periodic Auction upon entry. After the orders are resting, however, the System will aggregate the size of Orders 2 and 3, check whether a Periodic Auction can be initiated (which it could because the minimum size requirement for Order 1 is satisfied), and the Periodic Auction initiation process would begin.

IOC Orders

The Exchange is also proposing to amend Rule 11.25(b)(2)(A) in order to reject Periodic Auction Orders that are IOC. Based on industry feedback, the Exchange believes that the majority of participants would use RHO orders to initiate or participate in a Periodic Auction and would not generally enter IOC orders to participate in the Periodic Auction process. Allowing for IOCs to participate in Periodic Auctions requires additional development work and, because the Exchange believes that there would not at the outset be significant interest in using such functionality, the Exchange believes that rejecting Periodic Auction Orders that are IOCs would simplify the Periodic Auction process without meaningfully impacting its practical functionality. Stated another way, the minimal benefits that would come from including IOCs at this time are outweighed by the cost to implement the functionality and rejecting IOCs would simplify the Periodic Auction process. As such, the Exchange is proposing to reject Periodic Auction Orders that are IOC orders.

Clean-Up Changes

The Exchange is also proposing to make non-substantive clean-up changes to make references to “Non-Displayed Limit Order” in Rules 11.25(b)(1) and (2) instead read “non-displayed limit order” and to delete an extra instance of the word “be” from Rule 11.25(b)(3).

2. Statutory Basis

The Exchange believes the proposed rule change is consistent with the requirements of Section 6(b) of the Act, in general, and Section 6(b)(5) of the Act, in particular, in that it is designed to remove impediments to and perfect the mechanism of a free and open market and a national market system, to promote just and equitable principles of trade, and, in general, to protect investors and the public interest and not to permit unfair discrimination between customers, issuers, brokers, or dealers. As further described below, the Exchange believes that the proposed rule change is consistent with the protection of investors and the public interest as it would help to clarify and simplify the Exchange's Periodic Auction process, which itself is intended to facilitate improved price formation and provide additional execution opportunities for investors, particularly in securities that may suffer from limited liquidity, including thinly-traded securities. Specifically, the Exchange believes that its proposed changes to the rule text that: (i) Periodic Auction Eligible Orders will be ranked as non-displayed limit orders consistent with the priority of orders outlined in Rule 11.12(a); (ii) incoming Periodic Auction Eligible Orders that are eligible both to trade on the Continuous Book and initiate a Periodic Auction against a Periodic Auction Only Order at the same price will trade immediately with the Continuous Book, and other incoming Periodic Auction Eligible Orders will upon entry interact with Continuous Book Orders and other Periodic Auction Eligible Orders according to their rank under Rule 11.12(a); and (iii) Periodic Auction Eligible Orders that are also Minimum Quantity Orders will only initiate a Periodic Auction upon entry where a single contra-side Periodic Auction Order would satisfy the specified minimum size, are all consistent with the Act because they are designed to promote just and equitable principles of trade and, in general, to protect investors and the public interest because the changes make the rules of the Exchange more straightforward and easily understandable. The Exchange also believes that its simplifying change to reject Periodic Auction Orders that are IOC is consistent with the Act because it is designed to promote just and equitable principles of trade and, in general, to protect investors and the public interest because it will simplify Periodic Auction functionality without meaningfully impacting its utility. Finally, the Exchange believes that its proposed non-substantive clean-up changes to Rule 11.25(b)(1), (2), and (3) are consistent with the Act because they are designed to promote just and equitable principles of trade and, in general, to protect investors and the public interest because the changes are designed to make the rules of the Exchange more easily understandable.

Ranking Periodic Auction Eligible Orders

The Exchange believes that the proposed change to add a new clarifying sentence to Rule 11.25(b)(2) is consistent with the Act because it is designed to promote just and equitable principles of trade and, in general, to protect investors and the public interest because the changes are designed to make the rules of the Exchange more straightforward and easily understandable by making explicit that Periodic Auction Eligible Orders will be ranked in price-time priority among Continuous Book Orders and will also help to make clear how incoming orders (both Periodic Auction Eligible Orders and Continuous Book Orders) will interact with resting orders. As described above, the point that is being clarified could reasonably be inferred from the definition of Periodic Auctions Orders and is consistent with the intent of current Rule 11.25(b)(2). The Exchange believes that adding the clarifying change will promote just and equitable principles of trade and remove impediments to a free and open market by making explicit how Periodic Auction Eligible Orders will be ranked and how incoming orders will interact with resting orders.

Incoming Periodic Auction Eligible Orders

The Exchange believes that the proposed change to Rule 11.25(b)(2) is consistent with the Act because it is designed to promote just and equitable principles of trade and, in general, to protect investors and the public interest because the changes are designed to make the rules of the Exchange more straightforward and easily understandable by making more clear how incoming Periodic Auction Eligible Orders will interact with resting orders. The current rule text was originally introduced to make clear that an incoming Periodic Auction Eligible Order would interact with other Periodic Auction Eligible Orders and Continuous Book Orders before interacting with Periodic Auction Only Orders, as made clear in AP Example 3. The Exchange believes that the proposed new language is consistent with the Act in that it will make the rule text more clear and easily understandable. The proposed rule text will also change the existing functionality from how it was described in Corrected Example 6 from Amendment No. 3 such that an incoming Periodic Auction Eligible Order will now initiate a Periodic Auction where there is a Periodic Auction Only Order that is priced more aggressively than any other Continuous Book Orders instead of executing immediately with the most aggressively priced Continuous Book Order. The Exchange believes that this proposed new language will specify how resting Periodic Auction Only Orders will interact with incoming Periodic Auction Eligible Orders by specifying that immediate executions will occur where a Periodic Auction Only Order and Continuous Book Order are at the same price, but a Periodic Auction will be initiated when the Periodic Auction Only Order is priced more aggressively than the Continuous Book Order. The Exchange believes that this proposed change is consistent with the Act because it is designed to promote just and equitable principles of trade and, in general, to protect investors and the public interest because the change strikes a middle ground between prioritizing immediate executions and initiating Periodic Auctions as it relates to incoming Periodic Auction Eligible Orders and how they interact with resting Periodic Auction Only Orders and Continuous Book Orders. Further, the Exchange also notes that the proposed change will also clarify what it means when Periodic Auction Orders become “executable” against one another. Additionally, this proposal specifies that an order that is eligible both to trade on the Continuous Book and initiate a Periodic Auction against a Periodic Auction Only Order at the same price will trade immediately with the Continuous Book, but where the Periodic Auction Only Order is more aggressively priced than the Continuous Book Order, the incoming Periodic Auction Eligible Order will be sent to the Periodic Auction Book and the Periodic Auction initiation process would begin. The Exchange believes that such proposed functionality would promote just and equitable principles of trade and remove impediments to a free and open market by incentivizing the entry of aggressively priced Periodic Auction Only Orders, which the Exchange believes will add additional detail already memorialized in the Approved Proposal and making the Exchange's rules related to Periodic Auctions more explicit.

Periodic Auction Eligible Orders With a Minimum Quantity

The Exchange believes that its proposed change to Rule 11.25(b)(2)(C) is also consistent with the Act because it is designed to promote just and equitable principles of trade and, in general, to protect investors and the public interest because the changes are designed to make the rules of the Exchange more straightforward and easily understandable by making clear how Minimum Quantity Orders will be handled in initiating Periodic Auctions. Specifically, Rule 11.25(b)(2) currently describes how Minimum Quantity Orders will participate in Periodic Auctions and the use of such orders with Periodic Auction Eligible Orders, but does not explicitly address how such orders will be handled in initiating Periodic Auctions.

The current rule and the Approved Proposal are clear in describing how Minimum Quantity Orders will be handled in a Periodic Auction (they “will be executed in a Periodic Auction only if the minimum size specified can be executed against one or more contra-side orders”), but they do not describe how incoming Periodic Auction Eligible Orders with minimum size requirements will be handled in initiating Periodic Auctions. Because Periodic Auction Eligible Orders are eligible to both execute against orders on the book or to initiate a Periodic Auction where they would execute against a Periodic Auction Order, an incoming order with a minimum size requirement creates unique issues related to how to calculate executable quantity and determining whether an order should be executed or initiate a Periodic Auction, especially where resting orders also have minimum size requirements. As such, the Exchange believes that it will benefit investors to explain how it intends to handle such Minimum Quantity Orders. The Exchange believes that having a Periodic Auction Eligible Order entered with a minimum execution quantity only initiate a Periodic Auction upon entry where a single contra-side Periodic Auction Order would satisfy the specified minimum size represents a straightforward approach to managing minimum execution quantity that makes the interaction of minimum execution quantity more easily understandable and predictable while ensuring that the minimum execution quantity will be satisfied if the incoming order initiates a Periodic Auction. This proposed change is consistent with the protection of investors and the public interest as it would help to simplify the minimum execution quantity functionality. As such, the Exchange believes that the proposed change to Rule 11.25(b)(2)(C) related to Minimum Quantity Orders is consistent with the Act.

IOC Orders

The Exchange believes that the proposed change to reject Periodic Auction Orders that are IOC orders will remove impediments to and perfect a national market system by simplifying the Periodic Auction process without meaningfully impacting its functionality. Specifically, based on industry feedback, the Exchange believes that the majority of participants would use RHO orders to initiate or participate in a Periodic Auction and would not generally enter IOC orders to participate in the Periodic Auction process. Allowing for IOCs to participate in Periodic Auctions requires additional development work and, because the Exchange believes that there would not at the outset be significant interest in using such functionality, the Exchange believes that rejecting Periodic Auction Orders that are IOCs would simplify the Periodic Auction process without meaningfully impacting its practical functionality. Stated another way, the minimal benefits that would come from including IOCs at this time are outweighed by the cost to implement the functionality and rejecting IOCs would simplify the Periodic Auction process. The Exchange also believes that eliminating this order instruction is consistent with the public interest and the protection of investors given the expected limited demand for use of this order instruction upon implementation. As such, the Exchange believes that this proposed change is consistent with the Act because it is designed to promote just and equitable principles of trade and, in general, to protect investors and the public interest because it will simplify Periodic Auction functionality without meaningfully impacting its utility.

Clean-Up Changes

Finally, the Exchange believes that making the non-substantive clean up changes including changing references to “Non-Displayed Limit Order” in Rules 11.25(b)(1) and (2) instead read “non-displayed limit order” and to delete an extra instance of the word “be” from Rule 11.25(b)(3) are consistent with the Act because they are designed to promote just and equitable principles of trade and, in general, to protect investors and the public interest because the changes are designed to make the rules of the Exchange more easily understandable.

B. Self-Regulatory Organization's Statement on Burden on Competition

The Exchange does not believe that the proposed rule change would impose any burden on competition that is not necessary or appropriate in furtherance of the purposes of the Act. Rather, the proposed rule change would allow the Exchange to make certain clarifying and simplifying changes to the Exchange's rules and functionality related to Periodic Auctions in a manner consistent with the current Rules (and the Approved Proposal), making the Periodic Auction functionality more straightforward and transparent prior to implementation. The Exchange's Periodic Auction functionality is designed to introduce innovative functionality to allow competition and to improve market quality in thinly-traded and other securities. The equities industry is fiercely competitive as the Exchange must compete with other equities exchanges and off-exchange venues for order flow and this proposal will allow the Exchange to implement certain simplifying and clarifying changes to its Periodic Auction rules and functionality that will allow it to better compete in this market.

C. Self-Regulatory Organization's Statement on Comments on the Proposed Rule Change Received From Members, Participants, or Others

No written comments were solicited or received on the proposed rule change.

II. Discussion and Commission Findings

After careful review, the Commission finds that the proposed rule change, as modified by Amendment No. 2, is consistent with the requirements of the Act and the rules and regulations thereunder applicable to a national securities exchange. In particular, the Commission finds that the proposed rule change is consistent with Section 6(b)(1) of the Act, which requires that a national securities exchange be so organized as to have the capacity to be able to (among other things) carry out the purposes of the Act and to comply with the provisions of the Act, the rules and regulations thereunder, and the rules of the exchange. These changes, including the clean-up changes, will allow BYX to continue to be organized to have the capacity to be able to comply with its rules. The Commission also finds that the clarifications regarding the operation of Periodic Auctions are consistent Section 6(b)(5) of the Act, which requires that the proposed rule change be designed to (among other things) remove impediments to and perfect the mechanism of a free and open market and a national market system, to promote just and equitable principles of trade, and, in general, to protect investors and the public interest. The Commission believes that the Exchange's effort to help market participants' understand how order types will interact and the operation of Periodic Auctions is consistent with the protection of investors and the public interest.

Similarly, the Commission finds that the proposal to reject Periodic Auction Orders that are IOC, as well as the proposal to permit a Periodic Auction Eligible Order entered with a minimum execution quantity to initiate a Periodic Auction upon entry only where a single contra-side Periodic Auction Order satisfies the specified minimum size, are consistent with Section 6(b)(5) of the Act. The rejection of Periodic Auction Orders that are IOC should simplify Periodic Auctions without negatively affecting their utility and therefore the Commission believes this proposal is consistent with the protection of investors and the public interest. The Commission believes that the new provision that allows a Periodic Auction Eligible Order entered with a minimum execution quantity to initiate a Periodic Auction upon entry only where a single contra-side Periodic Auction Order satisfies the specified minimum size clarifies the operation of Periodic Auctions and therefore is consistent with the protection of investors and the public interest. Lastly, the Commission finds that the Aggressive PAO Change is consistent with Section 6(b)(5) of the Act. The Commission believes that this discrete change may incentivize entry of aggressively priced Periodic Auction Only Orders and should in this particular circumstance improve the opportunity for price improvement for incoming orders, which is consistent with the removal of impediments to and perfection of the mechanism of a free and open market and a national market system, the promotion of just and equitable principles of trade, and the protection of investors and the public interest.

III. Solicitation of Comments on Amendment No. 2 to the Proposed Rule Change

Interested persons are invited to submit written data, views, and arguments concerning whether Amendment No. 2 is consistent with the Exchange Act. Comments may be submitted by any of the following methods:

Electronic Comments

• Use the Commission's internet comment form ( http://www.sec.gov/rules/sro.shtml ); or

• Send an email to rule-comments@sec.gov. Please include File Number SR-CboeBYX-2021-024 on the subject line.

Paper Comments

• Send paper comments in triplicate to Secretary, Securities and Exchange Commission, 100 F Street NE, Washington, DC 20549-1090.

All submissions should refer to File Number SR-CboeBYX-2021-024. This file number should be included on the subject line if email is used. To help the Commission process and review your comments more efficiently, please use only one method. The Commission will post all comments on the Commission's internet website ( http://www.sec.gov/rules/sro.shtml ). Copies of the submission, all subsequent amendments, all written statements with respect to the proposed rule change that are filed with the Commission, and all written communications relating to the proposed rule change between the Commission and any person, other than those that may be withheld from the public in accordance with the provisions of 5 U.S.C. 552, will be available for website viewing and printing in the Commission's Public Reference Room, 100 F Street NE, Washington, DC 20549, on official business days between the hours of 10:00 a.m. and 3:00 p.m. Copies of the filing also will be available for inspection and copying at the principal office of the Exchange. All comments received will be posted without change. Persons submitting comments are cautioned that we do not redact or edit personal identifying information from comment submissions. You should submit only information that you wish to make available publicly. All submissions should refer to File Number SR-CboeBYX-2021-024, and should be submitted on or before February 16, 2022.

IV. Accelerated Approval of Proposed Rule Change, as Modified by Amendment No. 2

The Commission finds good cause to approve the proposed rule change, as modified by Amendment No. 2, prior to the thirtieth day after the date of publication of notice of the filing of Amendment No. 2 in the Federal Register . In Amendment No. 2, the Exchange proposed the Aggressive PAO Change in place of a clarification it sought in the original proposal. As discussed above, the Aggressive PAO Change is consistent with the requirements of the Act, and does not raise novel regulatory issues. Accordingly, the Commission finds good cause, pursuant to Section 19(b)(2) of the Act, to approve the proposed rule change, as modified by Amendment No. 2, on an accelerated basis.

V. Conclusion

It is therefore ordered, pursuant to Section 19(b)(2) of the Act, that the proposed rule change, as modified by Amendment No. 2 (SR-CboeBYX-2021-024), be, and hereby is, approved on an accelerated basis.