After-Hours Stock Volume Screener
Find extended-hours stock activity with ChartsWatcher’s postmarket volume filter. Combine share turnover with after-hours price change and recent news.
Understand the metric
What is Postmarket Volume?
Postmarket volume measures shares traded during the postmarket session. ChartsWatcher documents a special behavior during premarket: postmarket and premarket volumes are added together. This session-aware definition is important when using the same configuration at different times, because the field is not an isolated previous-after-hours total while premarket trading is underway.
An illustrative example
Postmarket Volume in practice
If 300,000 shares traded in postmarket and another 200,000 trade during premarket, the documented premarket behavior produces a combined 500,000 for this filter. A separate premarket-volume field describes only the early-session component, so the two values should not be assumed to match.
Make it part of your workflow
A more deliberate stock screen.
Build a ChartsWatcher extended-hours activity view using postmarket volume alongside the appropriate session price-change filter. When reviewing it before the open, include premarket volume as a separate reference so you can distinguish combined overnight participation from the early session’s contribution.
ChartsWatcher lets you combine this filter with other criteria in a toplist and rank the results by the columns you care about. Keep the shortlist beside charts, stock news, and watchlists in your own layout.
Explore the screener / toplistBefore you build
A little more detail.
How do I add Postmarket Volume in ChartsWatcher?
Open or create a toplist and add Postmarket Volume to its filter configuration. Choose the available options and the bounds that fit your screen. Combine it with other metrics to narrow the results. Filters can also refine which stocks qualify for an alert.
What should I check when interpreting this filter?
During premarket, this field includes both postmarket and premarket volume. Treating it as only after-hours volume would overstate that session’s isolated contribution.
From an idea to your own scan.
Use Postmarket Volume with the other conditions that define your setup. Keep matching stocks, charts, and news together, with a configuration you can refine as you go.