TMX Equity Trading Notice

Amendments to Minimum Interaction Size and Minimum Quantity in GTE

TMX Equities is pleased to announce that the proposed amendments to the Minimum Interaction Size ("MIS") and Minimum Quantity ("MinQty") features for each of Toronto Stock Exchange ("TSX"), TSX Venture Exchange ("TSXV"), and TSX Alpha Exchange ("Alpha" and together with TSX and TSXV, the "Exchanges") will be made available in our Gateway Testing Environment effective Thursday, April 17, 2025. Below are the details.

Technical Changes Summary:

CXLRemainingMISMinQty: Instructions to the Exchange to automatically cancel the remainder of the MIS or MinQty order once the remaining volume falls below the specified MIS or MinQTY threshold.

FIX Specifications:

Tag# 20221 = CXLRemainingMISMinQty = N = No (default), Y = Yes

Section 4 Business Content Messages

• 4.1.10 New Order – Dark Orders
• 4.4.11 New Order – Seek Dark Liquidity (SDL) order
• 4.1.14 New Order – Provide Dark Liquidity (PDL) order
• 4.4.9 Modify – Dark Orders
• 4.4.11 Modify – Provide Dark Liquidity (PDL) Order
• 4.7.1 Order – Single Acknowledgement
• 4.7.3 Execution Report – Replace
• 4.7.5 Execution Report – Cancelled
• 4.7.8 Execution Report – Partial or Complete Fill
• 4.7.9 Execution Report – Assign Time Priority to an Order

Broadcast Feeds:

Tag# 370 = CXLRemainingMISMinQty = N = No (default), Y = Yes

• 5.1 Order/Cancel Confirmation Report
• 5.4 Trade Report
• 5.11.3 Order Book Feed Message
• 5.12.1 Order Status Feed Message

For further information you can find the updated FIX and Broadcast Feed specifications on the TMX Webstore. Subject to change based on project developments.

For further information on the proposed amendments, please see Equities Notice 2025-012. The amendments continue to be subject to regulatory approval, and subject to regulatory approval, the amendments will be available in our Production environment effective Q2 2025.