Definition
A Market-on-Open (MOO) order is entered before the opening and participates in the TSX opening auction, executing at the calculated opening price. A Market-on-Close (MOC) order is entered before the MOC submission deadline (typically 3:40 PM Eastern on the TSX for the 4:00 PM close) and participates in the closing auction, executing at the calculated closing price (the official Toronto Stock Exchange closing price used for index calculations and NAVPS calculations). MOC orders may be submitted as offsetting or imbalance-only orders to stabilize the closing auction. Under UMIR, manipulative use of MOC orders to influence the closing price is prohibited. Institutional investors frequently use MOC orders when their portfolio is benchmarked to a closing-price index, eliminating tracking error from intraday execution. Both order types are guaranteed to execute at their respective auction price but offer no price certainty - the auction may clear significantly away from the last traded price if there is a large order imbalance.
Source
TSX Trading Rules, MOC order type specifications; UMIR 2.2 (manipulative trading prohibition)
Where this shows up on the CIRE
- Outcome 8.1