(a) When used in the Equity Rules, unless the context otherwise requires:

(1) "Customer" The term "customer" shall not include a broker or dealer.

(2) Reserved

(3) "Equity Rules" The term "Equity Rules" means the rules, as adopted by the Exchange Board of Directors pursuant to the By-Laws of the Exchange, as hereafter amended or supplemented, and also includes the General Equity and Options Rules, Certificate of Incorporation and the By-Laws of the Exchange.

(4) "Grandfathered Rules" The term "Grandfathered Rules" means the Rules of Board of Governors of the Boston Stock Exchange as in effect on the date of the closing of the acquisition of the Exchange by Nasdaq, Inc. and as such rules may be subsequently amended, including the Grandfathered BOX Trading Rules, to the extent that such rules are applicable to BOX and to former BOX Options Participants and associated persons for activities that occurred during the time that BOX was a facility of the Exchange. The Grandfathered Rules shall also apply to activities of members, members organizations, persons associated with members, and other persons subject to the jurisdiction of the Exchange that occurred prior to the adoption of the Equity Rules.

(5) Reserved

(6) "Nasdaq BX Equities Market" or "System" The terms "Nasdaq BX Equities Market" or "System" shall mean the automated system for order execution and trade reporting owned and operated by the Exchange. The System comprises:

(1) a montage for Quotes and Orders, referred to herein as the "Exchange Book", that collects and ranks all Quotes and Orders submitted by Participants;

(2) an Order execution service that enables Participants to automatically execute transactions in System Securities; and provides Participants with sufficient monitoring and updating capability to participate in an automated execution environment;

(3) a trade reporting service that submits "locked-in" trades for clearing to a registered clearing agency for clearance and settlement; transmits last-sale reports of transactions automatically to the national trade reporting system, if required, for dissemination to the public and industry; and provides participants with monitoring and risk management capabilities to facilitate participation in a "locked-in" trading environment; and

(4) data feeds that can be used to display with attribution to Participants' MPIDs all Quotes and displayed Orders on both the bid and offer side of the market for all price levels then within the Nasdaq BX Equities Market, and that disseminate such additional information about Quotes, Orders, and transactions within the System as shall be reflected in the Exchange Rules.

(7) "Security." Unless the context requires otherwise, the term "security" shall mean a security listed on the Exchange or traded on the Exchange pursuant to unlisted trading privileges.

(8) "System Securities." The term “System Securities” shall mean any NMS stock, as defined in SEC Rule 600 except securities specifically excluded from trading via a list of excluded securities posted on www.nasdaqtrader.com.

(9) "Participant." The term "Participant" shall mean an entity that fulfills the obligations contained in Equity 2, Section 3 regarding participation in the System, and shall include:

(1) "Equities ECNs," members that meet all of the requirements of Equity 2, Section 14, and that participates in the System with respect to one or more System Securities.

(2) "Equities Market Makers" or "Market Makers", members that are registered as Equities Market Makers for purposes of participation in the System on a fully automated basis with respect to one or more System Securities.

(3) "Order Entry Firms," members that are registered as Order Entry Firms for purposes of entering orders in System Securities into the System. This term shall also include any Electronic Communications Network or Alternative Trading System (as such terms are defined in Regulation NMS) that fails to meet all the requirements of Equity 2, Section 14.

(10) "Quote." The term "Quote" means a single bid or offer quotation submitted to the System by a Market Maker or Equities ECN and designated for display (price and size) next to the Participant's MPID in the Exchange Book. Quotes are entered in the form of Orders with Attribution (as defined in Rule 4703). Accordingly, all Quotes are also Orders.

(11) "Order." The term "Order" means an instruction to trade a specified number of shares in a specified System Security submitted to the System by a Participant. An "Order Type" is a standardized set of instructions associated with an Order that define how it will behave with respect to pricing, execution, and/or posting to the Exchange Book when submitted to the System. An "Order Attribute" is a further set of variable instructions that may be associated with an Order to further define how it will behave with respect to pricing, execution, and/or posting to the Exchange Book when submitted to the System. The available Order Types and Order Attributes, and the Order Attributes that may be associated with particular Order Types, are described in Rules 4702 and 4703. One or more Order Attributes may be assigned to a single Order; provided, however, that if the use of multiple Order Attributes would provide contradictory instructions to an Order, the System will reject the Order or remove non-conforming Order Attributes.

(12) "E.T." The term "ET" means Eastern Standard Time or Eastern Daylight Time, as applicable.

(13) "Market Hours." The term "Market Hours" means the period of time beginning at 9:30 a.m. ET and ending at 4:00 p.m. ET (or such earlier time as may be designated by the Exchange on a day when the Exchange closes early). The term "System Hours" means the period of time beginning at 7:00 a.m. ET and ending at 7:00 p.m. ET (or such earlier time as may be designated by the Exchange on a day when the Exchange closes early). The term "Pre-Market Hours" means the period of time beginning at 7:00 a.m. ET and ending immediately prior to the commencement of Market Hours. The term "Post-Market Hours" means the period of time beginning immediately after the end of Market Hours and ending at 7:00 p.m. ET. The Exchange notes that in certain contexts, times cited in the Exchange Rules may be approximate.

(14) "Marketable." The term "marketable" with respect to an Order to buy (sell) means that, at the time it is entered into the System, the Order is priced at the current Best Offer or higher (at the current Best Bid or lower).

(15) "Market Participant Identifier" or "MPID." The term "market participant identifier" or "MPID" means a unique four-letter mnemonic assigned to each Participant in the System. A Participant may have one or more than one MPID.

(16) "Best Bid", "Best Offer", "National Best Bid and National Best Offer", "Protected Bid", "Protected Offer", "Protected Quotation" and "Intermarket Sweep Order." The terms "Best Bid", "Best Offer", "National Best Bid and National Best Offer", "Protected Bid", "Protected Offer", "Protected Quotation" and "Intermarket Sweep Order" shall have the meanings assigned to them under Rule 600 under SEC Regulation NMS; provided, however, that the terms "Best Bid", "Best Offer", "Protected Bid", "Protected Offer", and "Protected Quotation" shall, unless otherwise stated, refer to the bid, offer, or quotation of a market center other than the Exchange. The term "NBBO" shall mean the "National Best Bid and National Best Offer".

(17) "Minimum Price Increment." The term "minimum price increment" means $0.01 in the case of a System Security priced at $1 or more per share, and $0.0001 in the case of a System Security priced at less than $1 per share.

(18) "System Book Feed." The term "System Book Feed" shall mean a data feed for System Securities, generally known as the BX TotalView ITCH feed.

Adopted October 23, 2019 (SR-BX-2019-039); amended April 27, 2021 (SR-BX-2021-012); amended December 21, 2021 (SR-BX-2021-051), operative December 31, 2021.