Reacting to a Sudden News Shock

The interviewer sets a scene: you're quoting a market, or holding a position, and a headline drops — an earnings surprise, a central bank statement, a data print nobody expected. What do you do in the next five seconds? This question has nothing to do with predicting the news correctly. It's checking whether your instinct under a sudden jump in uncertainty is to protect yourself first and figure out the right level second.

The order of operations

The single most important idea to state up front is the sequence: widen or pull your quotes before you try to figure out the new fair value. The moment news breaks, you don't know the new price — you only know that your old price is now stale and probably wrong in some direction. If you keep quoting your old tight spread while everyone else has already repriced, you become the most attractive counterparty in the market for exactly the wrong reason: informed traders will pick off your stale quote before you can update it. Widening first, thinking second, is what protects you from being adversely selected during the gap between the news hitting and you having a considered view.

Only after your exposure to being picked off is controlled should you start forming a view on direction and size — checking correlated instruments, looking at how the futures or related names are moving, and gradually tightening back toward a new fair value as your confidence in it grows. This is the same instinct as pulling your hand back from a hot stove before diagnosing the burn.

What this looks like in practice

If you're already holding a position when the shock hits, the same ordering applies: first assess whether the move has already invalidated your risk limits (see Hitting a Risk Limit Mid-Trade), and default toward reducing risk rather than reacting with a strong directional view formed in the first few seconds. A trader who immediately doubles down on a hot take about "what the news really means" before confirming their risk is under control has the order backwards. Interviewers are listening for "protect first, opine second" — and for the trader's ability to admit that in the first moment after a shock, they simply don't have enough information to have a confident opinion.