The Lab
May 22, 2026

Gap Fill Tool

Does the Gap Fill, or Does It Hold?

This tool helps you predict what's likely to happen after a stock gaps up or down at the open.

Not every gap behaves the same way. Some gaps fill quickly, while others hold and the stock continues moving strongly in that direction. What often makes the difference is how similar gaps have played out in that stock's history.

This tool looks at past gaps that were similar in size and context to the one you're seeing today. It then shows you how often those gaps filled by the close, and how the stock typically moved over the following day. This gives you a clearer idea of whether the current gap is more likely to fill or continue.

What the Tool Shows You

Probability

Gap Fill Probability

Shows the historical probability that the current gap will be filled or held by the end of the trading day.

Projection

Next-Day Return

Shows the expected return for the following day based on how the stock has historically performed after similar gaps.

Scan

Auto-Detection

The tool automatically scans the market and highlights stocks with the strongest setups for the day ahead.

Log

Past Similar Setups

A full log of every past day when conditions were similar.

How Traders are using the Gap Fill Tool

1

Morning Scan

Start the day by checking which stocks have gapped and whether the tool is highlighting any notable setups. This helps you quickly identify names that may be setting up for a meaningful move.

2

Review the Gap Fill Probability

Look at how often similar gaps have filled in the past. This provides a realistic view of whether the current gap is more likely to fill or hold, rather than relying on assumptions.

3

Check the Next Day Projection

Review the expected return for the following day based on how the stock has historically performed after comparable gaps. This helps you plan your strategy for both the current session and the day after.

See whether your stock's gap fills or holds

Open Gap Fill Tool

Get in Touch

We welcome inquiries from traders, investors, institutions and affiliates
interested in learning more about our tools.