April 26, 2023
Equities Notice 2023-015

TMX Equity Trading Notice

Final Reminder: Implementation Details for the Q2 2023 Trading Enhancements

TMX Market Operations would like to remind all clients of the upcoming Q2 - 2023 Enhancements to the Toronto Stock Exchange ("TSX"), TSX Venture Exchange ("TSXV") and TSX Alpha Exchange ("TSXA"). These enhancements are currently available for testing in the GTE environment and are scheduled to be available in our production environment effective May 1st, 2023.

Implementation details can be found as follows:

Enhancement	Markets	Reference
TSX ETF Indicative Midpoint	TSX, TSXV	Datalinx Notice 2023-001
Timestamp GranularIty	TSX, TSXV, TSXA	Datalinx Notice 2023-001
Enhanced Cancel Reason Codes	TSX. TSXV, TSXA	Equities Notice 2023-001

We are also advising clients that an additional reason code from what was originally announced will be made available as follows:

Specification	Tag	Field Name	Comments
FIX Order Entry	58	Text	‘Killed due to Post Only'
Broadcast Feed	616	ReasonCode*	‘42' - Killed due to Post Only

*The tag is private and thus fully encrypted

Updated specifications and technical details for these enhancements can be found on the TMX Webstore.