# EDGAR Filing Document

**Accession Number:** 0002000464
**File Stem:** 0002000464-26-000001
**Filing Date:** 2026-1
**Character Count:** 68497
**Document Hash:** 2753514e824aa2097605bcb91ab8df12
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0002000464-26-000001.hdr.sgml**: 20260129

**ACCESSION NUMBER**: 0002000464-26-000001

**CONFORMED SUBMISSION TYPE**: ATS-N/UA

**PUBLIC DOCUMENT COUNT**: 4

**FILED AS OF DATE**: 20260129

**DATE AS OF CHANGE**: 20260129

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** TMX ALPHA US, LLC
- **CENTRAL INDEX KEY:** 0002000464

**ORGANIZATION NAME:**
- **EIN:** 320747713
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** ATS-N/UA
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 013-00202
- **FILM NUMBER:** 26578921

**BUSINESS ADDRESS:**
- **STREET 1:** 225 LIBERTY ST, SUITE 2310
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10281
- **BUSINESS PHONE:** 332-900-6690

**MAIL ADDRESS:**
- **STREET 1:** 225 LIBERTY ST, SUITE 2310
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10281

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** TSX ALPHA U.S., INC.
- **DATE OF NAME CHANGE:** 20251111

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** TMX ALPHA US, LLC
- **DATE OF NAME CHANGE:** 20251104

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** TSX ALPHA U.S., INC.
- **DATE OF NAME CHANGE:** 20231108

### Attached PDF Documents

**Attachment 1:** `exhibit_1.pdf`

_No text found in this document._

**Attachment 2:** `exhibit_2_indirect_owners.pdf`

_No text found in this document._

**Attachment 3:** `redlined_exhibit_1.pdf`

_No text found in this document._

## Form ATS-N/UA: NMS Stock Alternative Trading System Report

### Cover Page

**NMS Stock ATS Name:** AlphaX US

**Operates Pursuant to Form ATS?** —

**Statement About Amendment:**
TMX Alpha US, LLC is filing this Updating Amendment to amend Exhibit 1 referenced in Part I, Item 8 updating the executive officers of the Firm.

This Updating Amendment only applies to the broker-dealer operator.

### Part I: Basic Information

**1. Is the ATS operated by a registered broker-dealer?:** Yes

**2. Name of the NMS Stock ATS:** TMX ALPHA US, LLC

**3. Name(s) under which business is conducted:** AlphaX US

**4a. Broker-Dealer SEC File No.:** 008-71182

**4a. Broker-Dealer CRD No.:** 000329008

**5a. Self-Regulatory Organization:** Financial Industry Regulatory Authority, Inc.

**5b. Effective Date of Membership:** 05/31/2024

**5c. MPID:** ALPX

**6u. Website:** https://www.tmxalphaus.com/

**7. Primary Site Address:** Equinix NY5 Data Center, 800 Secaucus Road, Secaucus, US-NJ, 07094

**8. Is Exhibit 1 (list of subscribers) on a public website?:** No

**9. Is Exhibit 2 (written standards for access) on a public website?:** No

### Part II: Written Safeguards and Procedures

**1a. Are any business units of the Broker-Dealer Operator permitted to enter interest?** —

**1b. Are the services offered and provided by the ATS to such business units the same?** —

**1c. Are there any arrangements between the ATS and such business unit?** —

**1d. Can order and trading interest of the business unit be routed out of the ATS?** No

**2a. Are any Affiliates of the Broker-Dealer Operator permitted to enter interest?** —

**2b. Are the services offered and provided by the ATS to such Affiliates the same?** —

**2c. Are there any arrangements between the ATS and such Affiliate?** —

**2d. Can order and trading interest of the Affiliate be routed out of the ATS?** No

**3a. Can a Subscriber opt-out from interacting with the order and trading interest of the Broker-Dealer Operator?** —

**3b. Can a Subscriber opt-out from interacting with the order and trading interest of an Affiliate?** —

**3c. Are the means to opt-out the same for all Subscribers?** —

**4a. Are there any arrangements between the Broker-Dealer Operator and a trading center?** No

**5a. Does the Broker-Dealer Operator offer any products or services to Subscribers?** Yes

   - **Products/Services:** AlphaX Hub

TMX Alpha US, LLC offers an optional interface through the internet called AlphaX Hub to its Participants.  In this regard, AlphaX US considers the term "Participant" to be synonymous with "Subscriber".  Participants, through their authorized users, may use AlphaX Hub to request Participant Parameters ("PP") (i.e., counterparty selection and minimum execution quantity, as described in Part II, Item 7.a).  Within the AlphaX Hub, Participants can also choose the length of time they want PP to apply to their orders.  Although authorized users of a Participant may use the AlphaX Hub to modify and/or request PP during the trading day, requested modifications will not take effect until at least the next trading day.  Authorized users of the Participant will choose a date for PP updates to be implemented any time on or after the next trading day.

If a Participant chooses to use the AlphaX Hub, each authorized user of the Participant will receive password-protected access giving the authorized user access to the Participant's information.  Once PP are selected, the PP are identified through a tag sent via Financial Information eXchange ("FIX") 4.2 or Binary ("BIN") protocol.

There is no fee associated with utilizing the AlphaX Hub, and there is no trading data or other information sent from the AlphaX Hub to a Participant's authorized users.  The authorized users of a Participant will receive an email confirmation from AlphaX US when a request has been received via the AlphaX Hub.

AlphaX Hub contains no Confidential Trading Information, but is nevertheless supported by the Intercompany Services Agreement TMX Alpha US, LLC has in place with TSX Inc. and a Software License Agreement with Montreal Exchange, Inc., both of which contain confidentiality provisions as described in Part II, Item 6.  All Shared Employees (as defined in Part II, Item 6.a) with access to information in, or transmitted through, the AlphaX Hub are bound to the confidentiality provisions set out below in Part II, Item 7, a.

If a Participant would like to set up PP, but does not wish to access AlphaX Hub, AlphaX US can set and/or modify PP at the request of an authorized user of the Participant.  The authorized users of a Participant will receive an email confirmation when a direct request has been received by the AlphaX US team.  AlphaX US will never set PP on behalf of a Participant unless an authorized user of the Participant has requested the PP through the AlphaX Hub, or directly through the AlphaX US team.

**5b. Are the terms and conditions of these products/services the same for all Subscribers?** —

**5c. Does an Affiliate of the Broker-Dealer Operator offer any products or services to Subscribers?** —

**5d. Are the terms and conditions of these products/services offered by the Affiliate the same for all Subscribers?** —

**6a. Do any employees of the Broker-Dealer Operator or its Affiliates access confidential trading information?** Yes

   - **Details:** TMX Group Limited is the ultimate parent company of TMX Alpha US, LLC.  TMX Group Limited operates the premier stock exchanges in Canada, including the Toronto Stock Exchange and Montreal Exchange.  TMX Alpha US, LLC has a Managing Director and Chief Compliance Officer ("CCO") who are also both employees of TSX, Inc., which is a subsidiary of TMX Group Limited.  The Managing Director's roles at both TMX Group Limited and TMX Alpha US, LLC focus on market structure analysis and product design.  The CCO's role at TMX Group Limited is focused on legal and regulatory compliance in regards to the Canadian stock exchanges.  The CCO's responsibilities with TMX Alpha US, LLC entail ensuring the ATS's adherence to regulatory requirements, mitigating compliance risks, and overseeing compliance programs.  Additionally, TMX Alpha US, LLC's Chief Financial Officer ("CFO") and Financial Operations Principal ("FinOP") is the CFO of VettaFi LLC, an affiliate of TMX Alpha US, LLC.  As CFO, she is responsible for providing leadership to TMX Alpha US, LLC and VettaFi LLC, as well as overseeing their financial operations.  TMX Alpha US, LLC's aforementioned Managing Director, CCO, and CFO each have access to Confidential Trading Information (as that term is defined in Part II, Item 7.a, and discussed further in Part II, Item 7.d).

TSX US Inc., TSX Inc., VettaFi LLC, and Montreal Exchange, Inc., are affiliates of TMX Alpha US, LLC (collectively, the "Affiliates"). TMX Alpha US, LLC has entered into Intercompany Services Agreements with TSX US Inc., TSX Inc., and VettaFi LLC, whereby certain employees of these Affiliates (collectively, "Shared Employees") provide services to TMX Alpha US, LLC. TMX Alpha US, LLC has also entered into a Software License Agreement with Montreal Exchange, Inc., in which TMX Alpha US, LLC licenses the trading technology software utilized by AlphaX US.

The services provided to TMX Alpha US, LLC by TSX US Inc. involve use of certain Shared Employees, and contribution to their salaries. The Shared Employees provided by TSX US Inc. to TMX Alpha US, LLC dedicate 100% of their time to TMX Alpha US, LLC. The services provided by Shared Employees of TSX Inc. include human resources, finance, internal audit, legal, compliance, facilities, corporate communications, governance information technology, enterprise risk management, integrated operations, and project-based assistance. The services provided by Shared Employees of VettaFi, LLC involve providing accounting and finance support services and services of TMX Alpha US, LLC's FinOP. The services provided by Shared Employees of Montreal Exchange, Inc. include licensing to TMX Alpha US, LLC the trading technology software utilized by AlphaX US. Please refer to Part II, Item 7.d for additional information regarding the roles and responsibilities of Shared Employees.

As a result of the Affiliate agreements, some of the Shared Employees will have access to Confidential Trading Information on AlphaX US. However, such Shared Employees only have access to the Confidential Trading Information created or maintained by AlphaX US necessary for them to provide services to TMX Alpha US, LLC. In such instances, the Shared Employees operate strictly in accordance with the services provided by their applicable agreements with TMX Alpha US, LLC, and otherwise in accordance with applicable regulatory considerations.

Other than in connection with the provision of services under each applicable Intercompany Services Agreement or the Software Licensing Agreement, no Affiliate of TMX Alpha US, LLC, and no systems operated by Affiliates of TMX Alpha US, LLC that are not for the benefit of TMX Alpha US, LLC, have direct or indirect access to AlphaX US or the Confidential Trading Information available therein.

**6b. Does any other entity provide services to the ATS?** Yes

   - **Providers:** As noted in Part II, Item 6.a, TMX Alpha US, LLC has entered into agreements with certain of its Affiliates. Specifically, TMX Alpha US, LLC has entered into Intercompany Services Agreements with TSX US Inc., TSX Inc., and VettaFi LLC to access various services from Shared Employees. As described further in Part III, Item 7.a., the technology support for AlphaX US's matching engine is provided pursuant to the Intercompany Services Agreement between TMX Alpha US, LLC and TSX Inc. TMX Alpha US, LLC has also entered into a Software License Agreement with Montreal Exchange, Inc., whereby that Affiliate provides the AlphaX US trading technology software detailed in Part III, Item 11. Pursuant to each of these agreements, the Affiliates support the services and functionalities of AlphaX US.

In addition to the foregoing, TMX Alpha US, LLC has entered into agreements with the following technology vendors who each support the services and functionalities of AlphaX US:

TMX Alpha US, LLC has entered into an agreement with Instinet, LLC ("Instinet") to provide the clearance and settlement services described in Part III, Item 22.

As described in Part III, Item 7.a, the data center used by AlphaX US is provided by Equinix, Inc. ("Equinix"). Specifically, Equinix operates the NY5 Data Center ("NY5") in Secaucus, N.J., where the AlphaX US matching engine is located. Participant broker-dealers connect to AlphaX US via the cross-connects managed by Equinix.

AlphaX US leases servers from Amazon Web Services, Inc. (AWS), which host the matching engine. Please refer to Part III, Item 11 for additional details regarding the matching engine.

TMX Alpha US, LLC has entered into an agreement with S3 Matching Technologies LP ("S3") to provide the Consolidated Audit Trail ("CAT") reporting and surveillance services described in Part II, Item 7.d.

As further described in Part III, Item 21, TMX Alpha US, LLC has engaged Nasdaq, Inc. ("NASDAQ") as its trade reporting facility ("TRF").

TMX Alpha US, LLC has entered into an agreement with Exchange Data International Limited ("EDI") to provide US equity security reference data files, as described in Part III, Item 23.a.

TMX Alpha US, LLC performs risk-based reviews of its third-party vendor relationships at the time of engagement, and periodically thereafter. The initial reviews include consideration of the service levels to be performed, potential strategic risk, and the security and confidentiality controls of the vendors. During periodic reviews, Registered Principals of TMX Alpha US, LLC review the security and confidentiality controls of TMX Alpha US, LLC's critical vendors.

**6c. Do any of these service providers also use the services of the ATS?** Yes

   - **Details:** Instinet provides clearing and settlement services to AlphaX US and is also a Participant.

**6d. Are the services of the ATS to such service provider the same as for other similar Subscribers?** —

**7a. Description of Safeguards and Procedures:**
Only FINRA registered broker-dealers are Participants to AlphaX US. The Confidential Trading Information of all Participants is maintained in electronic form and protected by password entry.

Confidential Trading information

"Confidential Trading Information" means (1) any real-time information regarding a Participant's orders, executions, and/or routing preferences; and (2) a Participant's post-trade order and execution metrics or statistics, and/or routing preferences.

Confidential Trading Information may be available in real-time (via the AlphaX US system directly) or post-trade (via other systems/tools or stored data) or both.

Pursuant to Affiliate Intercompany Services Agreements, Shared Employees are authorized to access real-time and post-trade Confidential Trading Information when it is necessary to support AlphaX US, including in the following instances:

1)	Market operations;
2)	Platform metrics and analytics;
3)	Business and technological development and support;
4)	System testing; and
5)	Regulatory reviews, testing, investigations, surveillances, and reporting.

TMX Alpha US, LLC strictly limits access to live AlphaX US production networks, databases, servers, applications, and data to those employees and Shared Employees who must have such access to perform their jobs, and further limits access only to the items necessary for their function. Secured access is maintained both physically and non-physically, as described below.

Physical Access Restrictions to Confidential Trading Information

Shared Employees responsible for the daily operation of AlphaX US, and who have access to the AlphaX US order book, are largely in separate physical locations from TMX Alpha US, LLC employees. There are also physical information barriers in place to separate AlphaX US from Affiliate systems.

Servers and related infrastructure are located at Equinix NY5, and physical access to NY5 is limited to key personnel. Access to the building is granted to individuals with valid government issued photo identification. NY5 is subject to high security standards, including video surveillance and 24x7 security. In addition, access to the cages where the servers and related infrastructure operated by TMX Alpha US, LLC are located can only be accessed by keycard and palm print authorization. Physical access to the TMX Alpha US, LLC offices is also restricted by keycard access.

Non-Physical Access Restrictions to Confidential Trading Information

Non-physical access to servers / desktops / laptops requires multi-factor authentication including passwords and authentication applications. All passwords must be actively maintained, and must follow password complexity and password aging rules. Failure to maintain an active password results in an inability to access the servers and related infrastructure via non-physical access. In addition to the use of multi-factor authentication, the servers and files accessible by Shared Employees are further restricted by each Shared Employee's credentials, and access is granted only to information needed to perform their specific services pursuant to the applicable Affiliate agreement.

TMX Alpha US, LLC utilizes electronic file storage systems for business records, documents, and Confidential Trading Information. Based upon the use case, the storage system may be cloud based, local, or a hybrid. Access to the files is limited to employees and Shared Employees who are authorized to view the Confidential Trading Information, and only to the extent that such access is necessary to the provision of services.

TMX Alpha US, LLC provides post-trade Confidential Trading Information to certain third-party vendors to aid it in the operation of its business, including in respect of clearing and settlement, trade surveillance, and trade reporting. All third-party vendors with access to Confidential Trading Information are subject to a risk due diligence process. Please refer to Part II, Item 7.a for additional information on third-party vendors.

Personal Trading Accounts

Employees are required to provide notification of outside brokerage accounts within 30 days of employment. Employees are also required to provide their account statements and trade notifications periodically. TMX Alpha US, LLC's Written Supervisory Procedures ("WSPs") set out policies and procedures regarding the required approvals related to employee trading accounts, as well as the prohibition from trading with material non-public information. The CCO conducts periodic reviews of employee accounts to ensure compliance with the WSPs regarding personal securities transactions. Annual certifications are also required as a reminder of, and to reinforce, these WSPs.

Periodic Training

All employees of TMX Alpha US, LLC and all Shared Employees must complete training, on an annual basis, related to cybersecurity awareness, conflicts of interest, and confidentiality. In addition, TMX Group Limited, the ultimate parent company of TMX Alpha US, LLC, also operates a continuous, organization-wide security awareness program that includes regular testing related to phishing and social engineering.

Periodic Review of Access

Only those persons who are so authorized may have access to records that contain sensitive data, or could compromise the confidentiality of a Participant. Any individual added or removed from access to Confidential Trading Information must be approved by a Registered Principal of TMX Alpha US, LLC. A review of individuals with access will then be performed by a Registered Principal at least every six months and adjusted as necessary. Passwords are required to be changed periodically, and are disabled for terminated individuals and those no longer requiring access to AlphaX US.

Computer systems for TMX Alpha US, LLC are protected by endpoint detection and response and anti-virus software, and laptop hard drives and USB drives are encrypted.

Third-Party Vendor Agreements

As noted in Part II, Item 6.a, TMX Alpha US, LLC has Intercompany Services Agreements in place with TSX US Inc., TSX Inc., and VettaFi LLC, and a Software License Agreement with Montreal Exchange, Inc. As noted in Part II, Item 6.a., TMX Alpha US, LLC also has agreements in place with third-party vendors offering services to AlphaX US. All of these agreements include confidentiality provisions that protect Confidential Trading Information from potential misuse by Shared Employees and third-party vendors. Furthermore, Confidential Trading Information is not accessible by other systems except for the legitimate business purposes related to AlphaX US. Shared Employees and third-party vendors may only access AlphaX US and Confidential Trading Information when strictly necessary to fulfill the terms of their applicable Affiliate and vendor agreements.

**7b. Can a Subscriber consent to the disclosure of its confidential trading information?** —

**7d. Summary of roles of persons with access to confidential trading information:**
The TMX Alpha US, LLC's Management Team, comprised of the President, CCO, and CFO, have oversight responsibilities that require access to both real-time and post-trade Confidential Trading Information.

TMX Alpha US, LLC's President and Sales, Product, and Operations Departments require access to both real-time and post-trade Confidential Trading Information for trade support, customization, Participant education, and market oversight.  These employees are the first point of contact for intraday Participant and trade support.  Their access to both real-time and post-trade Confidential Trading Information is essential to providing Participants with fast and efficient support while resolving any issues.  The operation of AlphaX US is monitored in real-time by the Market Operations Team to ensure the functioning of the trading system is in line with the AlphaX US operating procedures and securities trading rules and regulations.

Authorized Market Operations personnel monitor trading system status, latencies, data outputs, potential quote issues, as well as system load and capacity metrics.

As described in Part II, Item 6.a above, TMX Alpha US, LLC's Affiliates provide the services of Shared Employees pursuant to applicable Intercompany Services Agreements.  The Shared Employees who have access to certain Confidential Trading Information necessary to perform their services under applicable Affiliate agreements include individuals involved in the following roles and responsibilities:

1. Legal (who provide legal advice, and may need and have access to all forms of Confidential Trading Information in order to perform their legal advisory duties), provided by TSX Inc.;
2. Finance, Accounting, and Internal Audit (who provide support for invoicing, accounts payable, financial reconciliation, and audits, and may need post-trade Confidential Trading Information), provided by Vettafi, LLC and TSX Inc.;
3. Information Technology (who provide technical, testing, and development support, and may need and have access to all forms of Confidential Trading Information in order to perform their duties), provided by Montreal Exchange, Inc.;
4. Enterprise Risk Management (who provide and develop methods and processes to manage risk, and may need and have access to all forms of Confidential Trading Information in order to perform their duties), provided by TSX Inc.; and
5. Market Operations and Business Intelligence (who provide AlphaX US support and platform analytics, and may need and have access to all forms of Confidential Trading Information in order to perform their duties), provided by TSX Inc.
6. Compliance (who is responsible for the broker-dealer operator's compliance program, and has access to all forms of Confidential Trading Information for purposes of Participant onboarding and trade surveillance, as well as when assisting with regulatory inquiries and examinations), provided by TSX Inc.

Each of the Shared Employees are subject to, and bound by, internal policies regarding confidentiality as well as the confidentiality provisions in the applicable Intercompany Services Agreements.

TMX Alpha US, LLC has contracted the following third-party vendors who have access to Confidential Trading Information:

1. Instinet provides clearance and settlement services, and needs and has access to Confidential Trading Information related to real-time order executions, in order to perform clearing and settlement services;
2. S3 provides CAT reporting and surveillance services, and has access to all forms of Confidential Trading Information, for the purposes of CAT reporting and trade surveillance services; and
3. NASDAQ who will act as AlphaX US's TRF, will have access to all forms of Confidential Trading Information in order to perform its duties).

Each of the above third-party vendors is bound by the confidentiality provisions in its applicable agreement with TMX Alpha US, LLC.

### Part III: Manner of Operations

**1. Types of Subscribers:** Brokers, Dealers

**2a. Is a Subscriber required to be a registered broker-dealer?** Yes

**2b. Are there any other conditions for eligibility to become a Subscriber?** Yes

   - **Conditions:** AlphaX US allows as Participants those applicants who satisfy certain eligibility requirements. Specifically, Participants must meet the following requirements:

1. Be registered with the U.S. Securities and Exchange Commission (the "SEC") as a broker or dealer, and a member of at least one self-regulatory organization ("SRO").
2. Pass a disciplinary/regulatory review, which includes reviewing public information to determine if the potential Participant has a disciplinary history that would preclude trading on AlphaX US.
3. Pass Office of Foreign Asset Control (OFAC) checks.
4. Pass technology certification with the TMX Alpha US, LLC team, to ensure connectivity and messaging work effectively.
5. Establish the necessary Qualified Service Representative ("QSR") service relationship with TMX Alpha US, LLC's chosen clearing provider, Instinet.
6. Execute the Participant Agreement.

After completing the process for reviewing Participant eligibility, AlphaX US will approve, deny, or approve with restrictions applications for participation.  All Participants will be treated equally as it relates to this process, and will be approved to access AlphaX US if they meet all of the requirements enumerated above.  Each approval, denial, or approval with restrictions must be authorized by TMX Alpha US, LLC's President.  A Registered Representative of TMX Alpha US, LLC will then promptly notify the Participant of the decision.

**2c. Are the conditions for eligibility the same for all persons?** —

**2d. Is there a written agreement required to use the ATS?** Yes

**3a. Are there any conditions under which a Subscriber may be excluded?** Yes

   - **Conditions:** A Participant can be excluded from AlphaX US's services if the Participant no longer satisfies the eligibility requirements for acceptance as a Participant.  Additionally, AlphaX US may exclude Participants if their trading activities could negatively affect the trading system's capacity or ability to function.  Examples include a Participant sending too many orders in a short window of time and flooding the trading system, or a Participant sending and cancelling orders in rapid repetition with no opportunity to execute.  AlphaX US also uses a series of post-trade reports and tools to monitor for any problematic behavior within the trading system, and may exclude a Participant if, in the sole judgment of AlphaX US, such Participant is engaging or has engaged in behavior that potentially violates the policies of AlphaX US, applicable federal securities laws, regulations, and/or rules, or applicable FINRA rules.

For all conditional orders, AlphaX US will monitor firm-up rates and cancellation rates after a firm-up order is sent but prior to execution.  If a Participant engages in a pattern of not responding to firm-up requests or the Participant cancels firm-up orders prior to execution, AlphaX US will take appropriate action at its discretion, which could range from contacting the Participant to bring about a change in the Participant's behavior, suspending the Participant from utilizing the conditional order type in AlphaX US, or suspending a Participant from utilizing AlphaX US entirely.

**3b. Are these conditions the same for all Subscribers?** —

**4a. Hours of Operation:**
AlphaX US is open for the transaction of business on all business days during which the registered national securities exchanges that are the primary listing markets for NMS securities are open for business.  AlphaX US matches trades during regular U.S. market hours, generally 9:30:00 am to 4:00:00 pm Eastern Time (the "Regular Trading Hours").  AlphaX US allows order entry starting 60 minutes prior to the open of trading, beginning at 8:30:00 am Eastern Time ("Pre-Market Order Acceptance Period"), and continuing throughout the trading day, which ends at 4:00:00 pm Eastern Time.

**4b. Are the hours of operation the same for all Subscribers?** Yes

**5a. Are Subscribers permitted to enter orders and other messages by electronic means?** Yes

   - **Protocols:** TMX Alpha US, LLC permits orders and trading interest to be entered directly into AlphaX US.  All such orders and trading interest must be sent via FIX 4.2 or BIN protocol.  FIX access is available to all Participants through an internet protocol address via communications that are compliant with the FIX API provided by AlphaX US.

There is no default connection set by AlphaX US. Rather, Participants must choose whether they wish to connect via FIX 4.2 or BIN protocol. AlphaX US does not accept orders via any other forms of communication (e.g., telephone, email, instant message).

**5b. Are these protocols the same for all Subscribers?** —

**5c. Are there any other means to enter orders?** —

**5d. Are the terms and conditions for other means the same for all Subscribers?** —

**6a. Are co-location services offered?** —

**6c. Are any other means offered that reduce the latency of communications?** No

**6e. Are any other means offered that reduce the latency of communications between the ATS and its Subscribers?** No

**7a. Order Types and Attributes:**
AlphaX US offers trading in all Regulation NMS common stock, exchange-traded products ("ETPs") and American depository receipts ("ADRs"), all of which are Regulation NMS securities.

AlphaX US allows Participants to place firm orders.  In addition to firm orders, AlphaX US allows Participants to submit conditional orders.  AlphaX US executes the orders according to Participant specifications and order priority rules.

Order Types

AlphaX US maintains a dark batch auction order book, which has the following order types:

Market Orders: Market Orders are orders to buy or sell a stated amount of a security that is to be executed at or in between the National Best Bid and Offer (the "NBBO") in the matching process (the "Match Event").

Limit Orders: Limit Orders are orders to buy or sell a stated amount of a security at a specified price or better that are to be executed in the Match Event.

Peg Orders: Peg order prices change dynamically with the market until their specified durations are met, the orders are filled, or their limit prices are reached.

1. Midpoint Peg Orders: Midpoint Peg Orders are orders to buy or sell a stated amount of a security that are to be executed only at the midpoint price of the NBBO or better in the Match Event.  AlphaX US accepts Midpoint Peg Orders with or without a limit price, and Midpoint Peg Orders are eligible to match with all order types, in order to provide the opportunity for price improvement.
2. Primary Peg Orders: Primary Peg Orders are orders to buy at the NBB, or sell at the NBO, a stated amount of a security that is to be executed only at the primary peg in the Match Event.  Orders may be submitted with or without a limit price.  Participants also have the option to implement an offset to the primary price for this order type.
3. Marketable Peg Orders: Marketable Peg Orders are orders to buy at or below the NBO, or sell at or above the NBB, a stated amount of a security that is to be executed in the Match Event.  Orders may be submitted with or without a limit price. Participants also have the option to implement an offset to the NBBO for this order type.

AlphaX US does not offer post-only orders or price sliding orders.

Conditional Orders

Conditional orders are instructions to AlphaX US that Participants want to interact with the order book on a conditional basis.  Conditional orders never execute.  Instead, when conditional orders would otherwise match with contra party orders, the conditional orders are canceled by AlphaX US, and invitations are sent to the originating Participants, inviting them to send firm-up response orders.

Participants who send firm orders can choose not to interact with conditional orders on an order-by-order basis through their FIX or BIN connection.  The default setting is for firm orders to interact with conditional orders. Please refer to Part III, Item 9.a for more details on the handling of conditional orders.

Order Instructions

AlphaX US accepts orders with time-in-force ("TIF") instructions of Day or Immediate or Cancel ("IOC").  An IOC is automatically converted to an Auction or Cancel ("AOC") TIF upon receipt by AlphaX US.  Further details are as follows:

1. Day is the default TIF instruction.  Day orders are held by AlphaX US on its order book from the time of receipt until the end of Regular Trading Hours or such time that a "cancel" instruction is sent by the Participant, whichever comes first.  If unfulfilled by the end of Regular Trading Hours, Day orders are automatically canceled, and any Participant who submitted a Day order is notified through the system.
2. AOC orders (i.e., orders sent with the IOC tag) are held until the completion of the next Match Event, and if unexecuted, are automatically canceled.  AOC orders may be submitted with or without a limit price.  AOC orders are only eligible for firm orders and cannot be used for conditional orders.

Minimum Execution Quantity

AlphaX US offers a minimum quantity modifier for order execution.  The minimum quantity modifier allows a Participant to request a minimum share amount on an order execution, such that if the available liquidity is below the minimum quantity amount, the order will not execute.  AlphaX US does not combine contra-orders to meet a minimum execution quantity.

Routing

AlphaX US does not support the routing of orders to any other venue.

Message Priority

Incoming orders and related messages are processed in the order in which they are received by AlphaX US.

Match Priority

An order's match priority is based on price and the time at which such order is received relative to other orders.  Each order receives a sequence number on arrival, based on order of arrival into AlphaX US, which is used to determine time priority. Matching priority is constrained by PP (which are counterparty selection and minimum execution quantity).

Matching instructions are specified in accordance with the FIX and BIN protocols described above in Part III, Item 5.a, and defined by industry standard FIX tags and agreed upon BIN tags defined for these matching instructions.  Orders received by AlphaX US during the Pre-Market Order Acceptance Period are given a sequence number on arrival and will sit in the order book until Regular Trading Hours and then are matched pursuant to the matching priority of price/time, constrained by PP (as described in the paragraph above). The time priority is determined by the sequence number assigned to an order at the time of its receipt by AlphaX US.

Orders submitted to AlphaX US outside the Regular Trading Hours and the Pre-Market Order Acceptance Period are not accepted.  For all eligible securities, AlphaX US only executes if Limit-Up-Limit-Down ("LULD") bands are present, and the effective price of a potential match is not constrained by a LULD band.

Order Amendment

An open order may be amended by a Participant as long as the amendment is received by AlphaX US before a Match Event occurs.  If an order amendment is received during a Match Event and there is still an open order at the conclusion of the Match Event, the amendment will be processed at the conclusion of the Match Event. If the order has been filled during the Match Event and no open order remains, the amendment will be rejected at the end of the Match Event.  Order amendments are processed in the order in which they are received by AlphaX US and assigned a sequence number.  Amendments of existing order size only keep their original sequence number for purposes of time priority if the change is a decrease in the order size.  If the order size is increased, the price is altered in any way, or any other change is made, the sequence number is updated to the next sequence number for a new order, and the new sequence number is used for ranking priority.

Order Cancellation

An open order may be canceled by a Participant to the extent the cancellation order is received and processed by AlphaX US before a Match Event occurs.  If an order cancellation is received during a Match Event and there is still an open order at the conclusion of the Match Event, the cancellation will be processed at the conclusion of the Match Event.  If the order has been filled during the Match Event and no open order remains, the cancellation will be rejected at the end of the Match Event.  A cancellation order cancels all remaining open quantities on the open order.
 Cancellation orders are processed in the order in which they are received by AlphaX US.

**7b. Are the order types, attributes, and instructions the same for all Subscribers?** —

**8a. Does the ATS require a minimum or maximum order size?** —

**8c. Are odd-lot orders accepted and executed?** Yes

   - **Procedures:** Odd Lot orders are handled in the same manner as round lot orders, and are treated the same way for match priority purposes.

**8d. Are odd-lot procedures the same for all Subscribers?** Yes

**8e. Are mixed-lot orders accepted and executed?** Yes

   - **Procedures:** Mixed lot orders are handled in the same manner as round lot orders, and are treated the same for match priority purposes.

**8f. Are mixed-lot procedures the same for all Subscribers?** Yes

**9a. Does the ATS send any messages to indicate trading interest?** —

**10a. Opening/Re-opening/Closing Procedures:**
AlphaX US opens for trading in a given security when:

1. There is at least one publicly-displayed Limit Buy Order and one publicly-displayed Limit Sell Order for the security on the primary listing exchange;
2. Regular Trading Hours have begun; and
3. Valid LULD bands for the security have been publicly disseminated.

If an NMS Stock is halted for trading by the primary listing exchange pursuant to a regulatory halt, AlphaX US resumes matching when:

1. It receives a message from the securities information processor ("SIP") indicating that trading has resumed in the security; and
2. Valid LULD bands are present.

**10b. Are these procedures the same for all Subscribers?** Yes

**10c. Unexecuted Orders Procedures:**
All orders received by AlphaX US during the Pre-Market Order Acceptance Period are given a sequence number upon arrival and sit in the order book until the beginning of Regular Trading Hours and then are eligible to be matched at the first Match Event for that security.  In each Match Event (as defined in Part III, Item 11.b), each order's priority is based on book price and the time of its receipt by AlphaX US, as denoted by the sequence number assigned to the order, and constrained by PP.  Orders received outside these periods are not accepted.  In the event of a halt in trading during Regular Trading Hours, AlphaX US holds any unfilled orders already resting on its order book and will accept new orders.  Participants can cancel or modify orders during a trading halt, subject to AlphaX US procedures pertaining to cancellations and amendments of orders.  When AlphaX US resumes matching, any unfilled orders are eligible to execute at the next Match Event.  Trading resumes under the Match Event guidelines with no changes.  Any unfilled orders that remain open at the end of Regular Trading Hours are automatically canceled.  Please refer to Part III, Item 20 for additional information regarding trading halts.

**10d. Is there any difference in execution procedures during trading hours?** Yes

**10e. Is there any difference in pre-opening or execution procedures following a stoppage?** No

**11a. Structure of the NMS Stock ATS:**
AlphaX US is a non-displayed trading venue limited to broker-dealer Participants, and makes available for trading all Regulation NMS common stock, ETPs and ADRs.  AlphaX US operates periodic batch auctions at designated time intervals of 10 milliseconds +/- a randomized increment up to 10%.  Matching priority is determined on a price/time basis, constrained by Participant Parameters, which are counterparty selection and minimum execution quantity.

**11b. Are the means that facilitate access the same for all Subscribers?** —

**11c. Rules and procedures of the NMS Stock ATS:**
Periodic Auctions

Upon receipt, a firm order is placed in AlphaX US's order book and will be included in all Match Events for the life of the order, as long as the order is marketable at the time of the Match Event.  The Match Events (i.e., auctions) in each security are automatic, and occur at scheduled times as determined by AlphaX US's matching algorithm throughout the day and are calibrated separately by each Match Event.
 Each Match Event acts independently of each other.  The description below sets out how AlphaX US determines the time between Match Events, and how AlphaX US calibrates this time for each Match Event.

Match Event Intervals and Match Event Process: AlphaX US randomizes the time between Match Events within a time range of a base of 10 milliseconds and a randomized increment up to 10% on either side ("Match Event Intervals").  There is no human intervention or discretion involved in the timing of these Match Event Intervals.  Match Event Intervals are calibrated on a security-by-security basis.  Each security enters its first Match Event upon the primary market opening and a quote and LULD bands being available in the security.  The Match Event Interval (i.e., the duration of time until the next Match Event) is randomized to avoid a pattern that other Participants could detect.  Once a Match Event concludes, the new Match Event Interval commences immediately.

There is no defined time for a Match Event; however, a Match Event will not exceed five microseconds.  At the start of a Match Event, all marketable orders in the order book for a given security will be ranked, based on price/time priority.  Once a Match Event begins, any new orders will be queued and will not be eligible to trade until the next Match Event.  Prices are locked for the order book at the start of the Match Event.  The matching engine identifies any imbalance in marketable order quantity on the order book at that time.  Whichever side holds the lesser of an imbalance (i.e., the lower number of marketable shares on the order book) determines the matching order.  If there is no imbalance (i.e., there is an equal number of marketable shares on both sides of the order book), AlphaX US will begin the matching process using the side of the order book that has time priority (i.e., whichever side of the order book that has the marketable order with the lowest order sequence number).  Price, capped by NBBO to the second decimal point (with the exception of sub-dollar priced stocks, which are capped to the fourth decimal point), is the leading factor in priority of orders matched; however, this is constrained by any PP on the order that may limit availability on the other side.

As an example, if the match begins on the buy side and the order with the most aggressive price is identified, AlphaX US will move to the sell side.  If the most aggressive price on the sell side is an order for 300 shares and the buy side order AlphaX US is matching has a minimum execution quantity of 500 shares, AlphaX US cannot match these orders, and will move to the next most aggressively priced order on the sell side.  In the event of two orders with the same price and no eliminating factors due to PP, the time of order receipt, as denoted by the sequence number assigned to the order, is the tie breaker, and becomes the deciding factor.  There may be multiple matches at the end of a Match Event, as the matching engine logic matches as many shares as possible, given price levels and PP.  At the conclusion of a Match Event, all AOC orders that were not fully filled are canceled, and all Day orders (including conditional orders) that were not fully filled remain live in the AlphaX US order book for the next Match Event.

Self-Trade Prevention

AlphaX US provides a self-trade prevention ("STP") setting for its Participants.  This setting is not enabled by default, but can be enabled upon request.

Short Sales and Regulation SHO

AlphaX US's Participants are limited to U.S. registered broker-dealers that are obligated to comply with Regulation SHO Rule 203(b)(1), and pursuant to this rule, each short sale order must specify that a locate has been obtained.  For short sale orders subject to Rule 201 under Regulation SHO, the AlphaX US matching engine will prevent any orders from executing at the SIP NBB.

Locked or Crossed Market & Limit Up / Limit Down

AlphaX US uses SIP data for pricing information and does not match orders if the inside market for a stock is crossed (i.e., the market's best bid price exceeds the market's best ask price) or locked (i.e., the market's best bid price equals the market's best ask price).  For all eligible securities, AlphaX US only executes if the LULD bands are present, and the effective price of a potential match is not constrained by a LULD band.

Pricing Methodology

Orders are matched at the midpoints of the buyers' and sellers' order book prices at the time of the Match Event, which are capped at the NBBO, as obtained from the SIP.
 This results in an opportunity for price improvement for the Participants.  All such price improvement is split on a 50/50 basis between buyers and sellers (based on the book prices of the orders.  The only exception to price improvement is when Midpoint Peg orders match against other Midpoint Peg orders, and execute at the NBBO midpoint price at time of the Match Event.  A single Match Event can result in multiple executions at different prices.

Execution Errors

AlphaX US reviews trade exceptions, and in accordance with the Participant Agreement, maintains the right to adjust or cancel clearly erroneous trades.  In the event of a bona fide erroneous trade (as defined by FINRA Rule 11891 - Clearly Erroneous Transactions in Exchange Listed Securities), or in the event of an error by AlphaX US or a Participant, a Registered Principal of AlphaX US determines the best course of action, given the circumstances of the trade, and determines whether to cancel both sides of the trade, adjust price, or let the trade stand.  Such decision is determined using relevant rules, and the AlphaX US internal trading policies.  In the event a clearly erroneous trade needs to be adjusted or canceled, AlphaX US will contact the Participants involved, to inform them of the ruling.

Trade Examples

1. Example of pricing methodology:a. NBBO of ZVZZT is 153.74 at 153.85b. Buy order in the order book at time of Match Event:i. 100 Shares of ZVZZT at 153.79c. Sell order in the order book at time of Match Event:i. 100 Shares of ZVZZT at 153.77d. The execution occurs at the midpoint of the buyer and seller limit prices, and 100 shares prints at 153.78.

2. Example 2 of pricing methodology:a. NBBO of ZVZZT is 153.74 at 153.85b. Buy order in the order book at time of Match Event:i. 100 Shares of ZVZZT at 153.79c. Sell order in the order book at time of Match Event:i. 100 shares of ZVZZT at 153.70d. Since the limit price of the sell order is outside the NBBO, we cap the limit of the sell order at the NBB of 153.74, and the Book Price for the sell order in the Match Event is 153.74e. The execution occurs at the midpoint of the buyer and seller Book Prices, and 100 shares prints at 153.765.

3. Example 1 of Price/Time Priority:a. NBBO of ZVZZT is 153.74 at 153.85b. Buy orders in the order book at time of Match Event:i. 500 shares at a limit of 153.79; arrived at 9:33:001, no PP attached to the orderii. 700 shares at a limit of 153.78; arrived at 9:33:30, no PP attached to the orderiii. 600 shares at a limit of 153.74; arrived at 9:33:301, no PP attached to the orderc. Sell order in the order book at time of Match Event:i. 2,800 shares at a limit of 153.75; arrived at 9:33:005, no PP attached to the orderd. Once a Match Event begins, any new orders will be queued and will not be eligible to trade until the next Match Event.  Prices are locked for the order book at the start of the Match Event - i.e., a "Midpoint Peg" order will be translated to the current midpoint price at the start of the Match Event.e. The Match Event begins with the smaller side of the imbalance, which in this case is the buy side (total order size in the order book is 1,800 shares on the buy side versus 2,800 on the sell side).  First priority is price and the buy order with the most aggressive price is Order #1 with a price of 153.79.  This trade will match at 153.77, the midpoint of the buyer and seller book prices.  There are still shares on the sell side available, so AlphaX US will move to the next best price on the buy side, which is Order #2 at 153.78.  These two orders will match and 700 shares print at 153.765, the midpoint of the buyer and seller book prices for these two orders.  AlphaX US goes to the next buyer with a limit of 153.74.  This buyer cannot match with the available seller due to its price limits.  AlphaX US has matched all possible orders in this Match Event, so two sets of matched orders are executed, and the Match Event Interval begins for the next Match Event.f. The orders with an open quantity at the conclusion of the Match Event will remain on the order book and be available for subsequent Match Events.

4. Example 2 of Price/Time Priority, Constrained by PP:a. NBBO of ZVZZT is 153.74 at 153.85b. Buy orders in the order book at time of Matching Event:i. 500 shares at 153.84; restricts participation to a specific counterparty (BDABC); arrived at 9:33:01c. Sell orders in the order book at time of Matching Event:i. 500 shares at 153.82; arrived at 9:33:015, no PP attached to the orderii. 500 shares at 153.83; Order is from BDABC; arrived at 9:33:02d. The Match Event begins with the smaller side of the imbalance, which in this case is the buy side (total order size in the order book is 500 shares on the buy side versus 1,000 on the sell side).  There is only one buy order, so AlphaX US starts with that order for matching.  First priority is price, so Order #1 on the sell side is the more aggressive price.  However, there are PP that prevent this match.  The buyer has specified the counterparty it wants to interact with and Order #1 on the sell side is from a different Participant.  AlphaX US moves to the next sell order, which is from BDABC, the same counterparty the buy order has requested to trade with.  AlphaX US is able to match Order #1 on the buy side with Order #2 on the sell side, and print 500 shares at 153.835 (the midpoint between the buyer and seller book prices).  AlphaX US has matched all possible orders in this Match Event, so the trade is executed, and the Match Event Interval begins for the next Match Event.e. The order with an open quantity at the conclusion of the Match Event will remain on the order book and be available for subsequent Match Events.

5. Example 3 of Price/Time Priority:a. NBBO of ZVZZT is 153.74 at 153.85b. Buy orders in the order book at time of Match Event:i. 500 shares at 153.84; arrived at 9:33:01, no PP attached to the orderii. 700 shares at 153.84; arrived at 9:33:05, no PP attached to the orderc. Sell orders in the order book at time of Match Event:i. 500 shares at 153.82; arrived at 9:33:015, no PP attached to the orderii. 500 shares at 153.83; arrived at 9:33:02, no PP attached to the orderd. The Match Event begins with the smaller side of the imbalance, which in this case is the sell side (total order size in the order book is 1,200 shares on the buy side versus 1,000 on the sell side).  First priority is price, and the more aggressive seller is Order #1 on the sell side, so AlphaX US starts the match with 500 shares to sell at 153.82.  Moving to the buy side, there are two orders with the same price.  Order #1 on the buy side arrived first, so AlphaX US matches 500 shares at 153.83 (the midpoint of the buyer and seller book prices).  AlphaX US then moves to the next sell order and tries to match that.  AlphaX US can in fact make a second match, so Seller #2 matches with Buyer #2 at 153.835 (the midpoint of those two orders).  AlphaX US has matched all possible orders in this Match Event, so two sets of matched orders are executed, and the Match Event Interval begins for the next Match Evente. The order with an open quantity at the conclusion of the Match Event will remain on the order book and be available for subsequent Match Events.

Procedures for Midpoint Peg Order Ranking and Execution:
a. AlphaX US accepts midpoint and non-midpoint order types.  Midpoint Peg orders are eligible to match with other Midpoint Peg orders, as well as non-Midpoint Peg orders in a Match Event.b. At the start of a Match Event, AlphaX snaps the NBBO for use in that Match Event.c. If an order is sent with both a Midpoint Peg order instruction and an explicit limit, AlphaX US will use the more conservative price for the Match Event.  If the limit price is more conservative than the implicit snapped NBBO price, then AlphaX US uses the limit price as the book price for the Match Event.  If the implicit snapped NBBO midpoint price is more conservative than the limit price, AlphaX US will use the Midpoint Peg order ranking procedures for the Match Event.d. If, at the start of a Match Event, the snapped NBBO midpoint is a valid tick (i.e., it is not a sub-tick increment), the Match Event proceeds as described in examples above, and the book price of Midpoint Peg orders will be the midpoint of the snapped NBBO for this Match Event. If, at the start of a Match Event, the snapped NBBO midpoint is not a valid tick (i.e., it is a sub-tick increment), the book price assigned to Midpoint Peg orders will be calculated by rounding the midpoint of the snapped NBBO passively (i.e., buy orders are rounded down, sell orders are rounded up).e. Matching then proceeds as described in Part III, Item 7a., as well as above in this Part III, Item 11.c.  Specifically, all Midpoint Peg orders have the opportunity to obtain price improvement by matching with a non-Midpoint Peg order if one is available.  The Match Event follows price/time priority, and if a Midpoint Peg order matches with a non-Midpoint Peg order, the orders will split price improvement equally, and the trade will be executed at the midpoint of the buyer and seller book prices.f. Once all matches have been identified through ranking at the assigned book price, any eligible Midpoint Peg orders remaining in the order book will match with one another, at the snapped NBBO midpoint in use for this Match Event.  Any PP constraints (counterparty selection and minimum execution quantity) will be taken into account, and in a case where there are multiple orders that could match, time will determine the priority of order matching.g. A Midpoint Peg order that matches in AlphaX US will never execute at a price worse than the snapped midpoint of the NBBO for the Match Event. An example of Midpoint Peg matching follows.

6. Example of Midpoint Peg Order Ranking and Execution:a. At the start of a Match Event, the NBBO is snapped and will be used for the entirety of the Match Event. NBBO of ZVZZT is snapped at 153.80 at 153.85b. Buy order in the order book at time of Match Event:i. 1,200 shares with a Midpoint Peg instruction and no additional price limit; arrived at 9:33:01, no PP attached to the order (Order #1)c. Sell orders in the order book at time of Match Event:i. 800 shares of a non-Midpoint Peg order with a limit price of 153.80; arrived at 9:33:015, no PP attached to the order (Order #2)ii. 500 shares with a Midpoint Peg instruction and no additional price limit; arrived at 9:33:02, no PP attached to the order (Order 3)d. Since the snapped NBBO midpoint for this Match Event is a sub-tick price of 153.825, AlphaX US passively rounds each Midpoint Peg order to obtain its book price for ranking.  The buy order (Order #1) now has an order book price of 153.82, and the sell order (Order #3) now has an order book price of 153.83e. The Match Event begins with the smaller side of the imbalance, which in this case is the buy side (total order size in the order book is 1,200 shares on the buy side versus 1,300 on the sell side). First priority is price, and the more aggressively priced order and only buyer is Order #1, so AlphaX US starts the match with 1,200 shares to buy at 153.82.  Moving to the sell side, the most aggressively priced order on the sell side is Order #2, 800 shares at 153.80, so AlphaX US matches 800 shares of Order #1 against 800 shares of Order #2 at 153.81 (the midpoint of the buyer and seller book prices)f. There are no more eligible orders priced more aggressively than the snapped NBBO midpoint price, so AlphaX US will now match any eligible Midpoint Peg orders at the implicit price of the snapped NBBO midpoint of 153.825g. The remaining 400 shares of the buy order (Order #1) will now match against the remaining shares of the sell order (Order #3) at 153.825 in the same Match Event.h. AlphaX US has matched all possible orders in this Match Event, so two sets of matched orders are executed, and the Match Event Interval begins for the next Match Eventi. The order with an open quantity at the conclusion of the Match Event will remain on the order book and be available for subsequent Match Events

**11d. Are these rules and procedures the same for all Subscribers?** —

**12a. Are there any arrangements to provide liquidity?** —

**13a. Is order or trading interest segmented?** —

**13b. Is the segmentation the same for all Subscribers?** —

**13c. Does segmentation depend on whether the order is from a customer?** No

**13d. Are segmentation categories disclosed to Subscribers?** —

**13e. Is the disclosure the same for all Subscribers?** —

**14a. Is a Subscriber designated to interact with specific trading interest?** Yes

   - **Details:** As noted in Part III, Item 11.b, AlphaX US provides an STP setting to its Participants. This setting is not enabled by default, but can be enabled upon request.  The STP setting prevents the self-trading of orders from the same Participant.

Apart from the STP setting, Participants can implement two other forms of counterparty selection on an order-by-order basis.  The first form of counterparty selection allows a Participant to choose to interact with order flow sent by itself.  The second form of counterparty selection allows a Participant to interact with directed order flow from another designated Participant or Participants.  For any given order, a Participant can choose more than one form of counterparty selection.  All Participants must indicate a request to interact with each other on their order flow for this to occur.  If order flow is sent by one Participant with a designation to interact, but there is no available order flow from the other Participant, the order will remain open on the order book until there is eligible order flow to trade against in a Match Event or the order is cancelled by the Participant.  These are the only forms of counterparty selection, and they are always at the full discretion of the Participant.  AlphaX US will never make any counterparty selection decisions on behalf of a Participant.  Even if a Participant designates who it wants to interact with, all trades in AlphaX US are still matched through the regular Match Event process and follow price/time priority, constrained by PP.  For example, a Participant may choose to interact only with orders sent from three different directed counterparties.  In order for any matches to occur, the contra-parties must also have orders that are available to interact with the other party.  Even though this is being "directed" to specific counterparts, the matching would still take place in a scheduled Match Event and would be matched based on price/time priority.  The selection of a counterparty (or in this case counterparties) is a PP that the Participant has placed on an order and would simply constrain who they would match against in the Match Event.  The trades of the matched orders would price based on the AlphaX US pricing model of the midpoint of the buyer and seller book prices.  Orders can only match between two counterparties when neither Participant has excluded the other from their executions through PP.  AlphaX US will never make a decision to add PP for any Participant, and all PP decisions, including those around counterparty selection, are made solely by the Participants.  AlphaX US will also never decline or modify PP from a Participant.

**14b. Is the counter-party selection the same for all Subscribers?** —

**15a. Does the ATS use electronic communications to display order and trading interest?** No

**15b. Is order and trading interest displayed to anyone other than Subscribers?** Yes

   - **Details:** AlphaX US does not display orders; however, it sends "firm-up" request messages to Participants who have submitted conditional orders.  These messages are sent when a Participant has already indicated their interest to trade through a conditional order and notifies them a potential contra-order is in the book based on their conditional order parameters.  The system does not guarantee a match for a specific price or quantity.

As outlined in Part III, Item 9.a, if a potential match is found for a conditional order sent by a Participant, AlphaX US sends a firm-up request inviting the Participant to trade.  As it relates to matches, firm-up requests are only sent if a Participant's minimum execution quantity has been met.

Firm-up requests contain the original conditional order IDs, cancel messages on the conditional orders, and unique firm-up IDs.  Other than the indication a contra-order is present resulting in firm-up requests, no details of the contra-side orders are submitted on the firm-up requests, such as quantity or price.

Participants may decline or ignore firm-up requests.  However, if a Participant decides to submit a firm order in response to a firm-up request, the Participant may change the order price or quantity originally noted in the conditional order.

**15c. Are the display procedures the same for all Subscribers?** —

**16a. Are orders or other messages routed out of the ATS?** No

**17a. Is there any difference between the treatment of order and trading interest based on source?** No

**17b. Is the treatment the same for all Subscribers?** Yes

**18a. Does the ATS execute trades outside of its regular trading hours?** No

**19a. Fees:**
AlphaX US charges transaction fees between $0.00 to $0.01 per share traded.  Transaction fees charged to Participants are negotiated during the onboarding process, and may be impacted by each Participant's expected trading volume on AlphaX US.  Rates can be renegotiated as warranted, based on changes or expected changes in Participant trading volume.

Since the ATS functions as an execution venue, CAT LLC will assess CAT Fees to the ATS for each transaction in Eligible Securities executed on the ATS.  These fees apply to transactions reported by the ATS to the TRF as a cross during the prior month.  AlphaX US will be identified as the CAT Executing Broker for both the buyer and seller in each cross executed on the ATS.  TMX Alpha US, LLC will be solely responsible for paying these transaction fees, and will not pass them through to Participants, in whole or in part.  Capitalized terms in this paragraph are defined in the CAT NMS Plan.

**19b. Bundled Services/Fees:**
There are no fees or charges for use of AlphaX US's services that are bundled with any Participant's use of non-ATS services or products offered by TMX Alpha US, LLC.

**19c. Rebates and Discounts:**
TMX Alpha US, LLC uses Participant activity, or expected activity, to negotiate transaction fees.  As activity grows, AlphaX US may renegotiate fee agreements with Participants (i.e., increase or decrease fees).  TMX Alpha US, LLC does not offer rebates.

**20a. Suspension of Trading Procedures:**
As discussed in Part III, Item 11.c, AlphaX US is programmed to react to "halt" messages it receives from the SIP from all U.S. equities exchanges.  It will not execute transactions in a security during periods in which trading in the security is halted on the primary listing exchange (e.g., subject to a LULD trading halt, single stock circuit breaker, or regulatory halt).  AlphaX US will also halt trading if AlphaX US is experiencing system issues that require such action.  For example, AlphaX US will halt trading if it is not receiving accurate market data for the pricing of trades, or has lost connection to the TRF provider or clearing broker for proper trade reporting and settlement.  Participants may cancel or modify their orders during a halt.

AlphaX US will cease to trade stocks during any halt or suspension of trading in said security on the primary listing exchange, including LULD and regulatory halts.  During halts, AlphaX US will continue to accept new orders, cancels, and order changes.  After a halt, once a security is unhalted by the primary listing exchange, it will be treated no differently than through the course of regular trading.  All matching rules and Match Event methodology remain consistent.

AlphaX US can suspend trading at any time, including the suspension of trading in individual NMS stocks, ETPs and/or ADRs for reasons such as approaching Regulation ATS Fair Access volume thresholds or Regulation SCI volume thresholds.  By default, if trading is suspended in a security during Regular Trading Hours, open orders and trading interests in AlphaX US will be canceled.  Any new orders received by AlphaX US while a security is disabled will be rejected.

**20b. Are these procedures the same for all Subscribers?** Yes

**21a. Trade Reporting Arrangements:**
When an execution occurs, AlphaX US delivers execution reports to the Participants involved in the execution, and to the NASDAQ Carteret TRF in accordance with FINRA trade reporting requirements.

**21b. Are these arrangements the same for all Subscribers?** Yes

**22a. Clearance and Settlement Arrangements:**
TMX Alpha US, LLC has a vendor agreement with Instinet to act on behalf of AlphaX US to clear and settle all transactions executed on AlphaX US.  Instinet submits all executions on behalf of AlphaX US to the National Securities Clearing Corporation ("NSCC") for clearing and to the Depository Trust Company ("DTC") for settling.  All Participants must thus have clearing brokers that are NSCC/DTC members, or be members themselves for self-clearing, and must also have a QSR relationship established with Instinet.  AlphaX US is a counterparty to all trades executed.

**22b. Are these arrangements the same for all Subscribers?** —

**23a. Market Data Sources:**
AlphaX US uses SIP data feeds to determine the NBBO, LULD bands, trade halts, and pegged order prices, and to price executions.

AlphaX US uses the U.S. equity reference data files from EDI to obtain reference information (e.g., ISIN/CUSIP, security type, instrument type, market symbol or ticker, and issuer) in regards to the NMS securities trading on AlphaX US.

**23b. Are these sources the same for all Subscribers?** Yes

**24a. Does the ATS aggregate Subscriber order and trading interest with that of other trading centers?** No

**25a. Did the ATS exceed the volume thresholds of Regulation ATS?** No

**26. Are order flow and execution statistics published?** —