What Happens to the Order Book in the Seconds Around a Major Release

[Shadow Trader]

In the minute before a tier-one release, liquidity providers typically reduce the size they are willing to show and widen the prices they quote. The reason is not mysterious. A market maker who leaves a tight, deep quote in place risks being picked off by anyone who reads the number a fraction of a second faster.

At the moment of release, many pricing engines pause or step back entirely. Quotes can become sparse, spreads on majors can stretch to several times their normal width, and price may jump between levels without trading at the ones in between. A chart candle shows a clean spike, but the underlying feed was a series of gaps.

Retail platforms inherit this behavior. Stops can be filled at the first available price rather than the level set, and market orders can execute well away from the last visible quote. Pending orders placed on both sides of price may even trigger in sequence during a single whipsaw.

Liquidity usually returns in stages rather than all at once. Spreads compress first on the most liquid pairs, then on crosses. A scalper studying releases benefits from recording spread and fill quality in the first thirty seconds, since that data describes the real cost of participating far better than the candle does.