Definition
Market-wide circuit breakers in Canada are coordinated through IIROC (now CIRO) under a framework that mirrors the U.S. circuit-breaker rules, reflecting the close integration of Canadian and U.S. equity markets. If the S&P 500 falls 7% from the prior day's close, a Level 1 circuit breaker triggers a 15-minute trading halt on all U.S. markets; a 13% drop triggers a Level 2 halt (also 15 minutes); a 20% drop triggers a Level 3 halt for the remainder of the trading day. Canadian regulators implemented a corresponding halt mechanism that coordinates with U.S. Level 1, 2, and 3 triggers, because most large-cap Canadian stocks also trade on U.S. exchanges as cross-listed securities or as ADRs. Single-stock halts are handled separately under UMIR 9.1 (trading halt for material news). The circuit-breaker mechanism is designed to allow time for information to disseminate and reduce the risk of a liquidity-driven cascade during extreme market dislocations.
Source
CIRO guidance on coordinated market-wide trading halts; U.S. SEC Rule 80B cross-reference; verify current Canadian thresholds with CIRO
Where this shows up on the CIRE
- Outcome 8.1