Getting Back On After The Event

Cutting risk before a scheduled event is the easy half of the decision — you know the event's timing in advance, so the trigger to reduce is unambiguous. Deciding when to get back in afterward is harder, because there's no equivalent clock telling you the market has finished digesting the news. The initial spike in volatility at the moment of release fades quickly, usually within minutes, but the market can keep repricing for hours or days afterward as different participants absorb the news at different speeds, and re-entering too early into that ongoing repricing can mean walking straight back into the volatility you just paid to avoid.

Why "the number is out" isn't "the risk is over"

The release of a headline figure is only the start of the market's reaction, not the end of it. Algorithmic and fast discretionary traders react in the first seconds; slower institutional flows, revisions to models, and second-order effects (what does this data point mean for the next rate decision, the next earnings season) continue to move prices over a longer window. A stock's realized volatility right after an earnings release, for instance, is typically still elevated well above its pre-event level for several days, even though the single largest jump — the initial reaction — has already happened. Rebuilding a full position the moment the headline print crosses the wire means re-entering during the period when the market's assessment of the news is still actively forming, not after it has settled.

What this means in practice

A common approach is to define re-entry not by a fixed time delay but by a measured condition: rebuild the position once realized or implied volatility on the instrument has come back down toward its typical pre-event level, or once the price has stopped making new extremes in the minutes following the release. Some desks re-enter in stages rather than all at once — a third of the position an hour after release, another third by end of day, the rest the next morning — so that if the immediate reaction turns out to be a false read that reverses, the strategy hasn't already committed its full size into it.

The cost of waiting too long is symmetric with the cost of waiting too little: every day spent at reduced size is a day of forgone expected return if the strategy's edge is real and ongoing. Desks that consistently wait far longer than the volatility actually warrants are paying an opportunity cost that's just as real as a rushed re-entry's risk, even though it's less visible on any single day.