Circuit breaker stock: What was the last time the mechanism was triggered?

The headline asks a historical question about when the circuit breaker mechanism was last triggered, which suggests it is a reference piece rather than a report of a new market event. Circuit breakers are exchange-imposed trading halts designed to pause trading during sharp declines, transmitting their effect through liquidity and risk-appetite channels by giving participants time to reprice orders and reduce forced selling. Because the mechanism is market-wide, its activation would most directly affect equity index futures, cash equities, and volatility-linked instruments, where price gaps and order imbalances concentrate. Traders typically watch the relevant exchange's published thresholds and any intraday index moves approaching them, alongside the volatility index as a gauge of stress.

HIGH-impact news is typically a market-moving event with multi-pip or multi-percent intraday reactions. Examples include central bank rate decisions, major CPI/NFP releases, geopolitical shocks, mega-cap earnings beats/misses, and regulatory announcements. Traders typically position-reduce or hedge ahead of scheduled HIGH-impact events, and follow the wire in real time to react to unscheduled ones (war headlines, central-bank emergency statements, surprise corporate actions). The Trading News Terminal squawk box reads every HIGH-impact headline aloud the moment it hits the wire — so active traders don't have to stare at the feed.

Active traders typically follow a three-step workflow when a market-moving headline hits the wire: (1) read the headline on the terminal or hear it on the squawk box; (2) assess whether the news is already priced in (by checking intraday price action in the seconds before) or whether it's genuinely new information; (3) act — either entering a breakout position, fading an overreaction, or tightening stops on existing trades. Trading News Terminal's Pro plan delivers wire-grade headlines within seconds of the source, with automatic audio squawk on every HIGH-impact event, so the read-assess-act cycle never waits on a refresh button.