Market Scanner Settings: How to Build Scans for Momentum, Reversals, and Earnings Moves

Overview

The most useful market scanner is usually not the one with the most filters. It is the one built around a clear trading question.

If your scanner is returning hundreds of symbols, it is probably too broad. If it returns none for days at a time, it may be too restrictive or mismatched to the current market regime. The goal is not to force action. The goal is to surface a manageable list of stocks that deserve a closer look.

Before choosing any stock scanner settings, define four things:

• Time horizon: Are you trading intraday, holding for a few days, or planning around a multi-day earnings reaction?
• Setup type: Are you looking for continuation, mean reversion, or catalyst-driven volatility?
• Liquidity needs: Your scanner should reflect the type of names you can actually trade without excessive spread or slippage.
• Risk rules: A scan is only useful if the resulting setups fit your position size, stop placement, and risk-reward rules.

For most retail traders, a practical scanner is built from layers:

1. Tradability filters such as price range, average daily volume, and spread.
2. Context filters such as relative volume, gap size, or earnings date.
3. Technical filters such as moving average location, range expansion, or distance from recent highs and lows.
4. Review filters such as chart cleanliness, catalyst quality, and whether the move is already too extended.

That layered approach matters because scanners are very good at finding conditions, but not very good at judging quality on their own. You still need to read the chart, check the catalyst, and decide whether the setup matches your plan.

If you already use a day trading watchlist, your scanner should support that workflow rather than replace it. A scanner gives you candidates; a watchlist gives you focus. If you need a process for narrowing names before the open, see Day Trading Watchlist Strategy: How to Build a Focused List Every Morning.

Checklist by scenario

Use the following scanner frameworks as starting points, not fixed formulas. Different brokers and platforms label filters differently, but the logic stays the same.

1) Momentum stock scanner checklist

This scan is for traders looking for strength that may continue, especially during active sessions with broad participation and clear catalysts.

Core question: Which stocks are already showing unusual interest and may continue moving if volume stays elevated?

Start with basic tradability filters:

• Minimum price high enough to avoid very thin, low-quality names.
• Average daily volume sufficient for your account size and trading style.
• Reasonable spread and clean intraday execution.
• Exchange-listed names if you want to exclude lower-liquidity over-the-counter issues.

Add momentum filters:

• Relative volume above normal.
• Gap up or strong open versus prior close.
• Price above key moving averages if you prefer trend alignment.
• Near intraday high, day high, or recent breakout level.
• Strong percentage change on the day.
• Unusual volume stocks with fresh participation, not just late-stage drift.

Add catalyst filters when possible:

• News released today or premarket.
• Earnings-related move.
• Guidance change, analyst reaction, sector sympathy, or other identifiable catalyst.

What to look for on the chart after the scan:

• Is the move orderly, or is it already parabolic?
• Did price hold above VWAP, premarket high, or another logical intraday reference?
• Are pullbacks getting bought with volume, or is the stock fading after the initial push?
• Is there room to the next resistance level?

Best use: building a short list of bullish stocks today for breakouts, flags, continuation entries, or strong closing moves.

When to tighten the scan: If you are seeing too many low-quality names, raise the minimum liquidity requirement, require an identifiable catalyst, or limit the scan to stocks above a trend filter.

When to loosen the scan: In quieter tape, reduce the percentage change threshold or lower the relative volume requirement modestly so you still surface developing names before they become obvious.

2) Reversal stock scanner checklist

This scan is for traders looking for failed breakdowns, oversold bounces, exhausted gap moves, or trend reversals after a sharp push.

Core question: Which stocks may be moving too far, too fast, and showing signs of stabilization or reversal?

Start with basic tradability filters:

• Price and liquidity suitable for your strategy.
• Avoid names with spreads too wide for tight-risk entries.
• Prefer symbols with enough historical price structure to identify support and resistance.

Add reversal-focused filters:

• Large recent decline or extended multi-day selloff.
• Gap down with intraday recovery.
• Price near a prior support area, major moving average, or range low.
• High relative volume, especially if the stock is reclaiming a key level.
• Large intraday range that may indicate emotional selling or capitulation.

Optional confirmation filters:

• Close back above the open after an early flush.
• Reclaim of VWAP, prior day low, or another defined level.
• Improving market internals or sector strength if you want broader confirmation.

What to inspect manually:

• Is the stock truly reversing, or just bouncing inside a larger downtrend?
• Did a major negative catalyst cause the move? Some news-driven gaps do not mean revert quickly.
• Are you trading into obvious overhead resistance?
• Does the setup offer enough upside relative to the stop distance?

Best use: finding bearish stocks today that may be exhausting to the downside, or locating swing trading stocks that are trying to stabilize after a sharp washout.

Important note: Reversals often look attractive because entry feels cheaper than momentum. But they can also be lower-quality if the underlying reason for the decline remains intact. This is where catalyst review matters more than scanner precision.

3) Earnings stock scanner checklist

This scan is for traders who want to track earnings movers today, after hours movers, and post-report continuation or fade setups.

Core question: Which stocks are reacting to earnings with enough volume and range to matter, but not so much chaos that the move is untradeable?

Start with an event filter:

• Earnings released before the open or after the close.
• Upcoming earnings within your planning window if you are building a stocks to watch tomorrow list.
• Optional: include guidance changes, conference call timing, or analyst revisions if your platform supports it.

Add reaction filters:

• Gap percentage threshold to catch meaningful reactions.
• Relative volume or premarket volume threshold.
• Range expansion versus average true range.
• Market cap or liquidity filters if you want to avoid thin small-cap reactions.

Add direction or structure filters depending on your style:

• Above premarket high for continuation longs.
• Below premarket low for continuation shorts.
• Inside the opening range if you prefer waiting for confirmation.
• Holding above or below key daily chart levels formed before earnings.

What to confirm manually:

• Was the move driven by headline EPS alone, or by guidance and forward commentary?
• Is the reaction in line with peers and sector ETFs?
• How large is the overnight move relative to recent volatility?
• Has the market already priced in most of the surprise?

Best use: creating an earnings stock scanner that surfaces both immediate opportunities and names to monitor for multi-day follow-through.

For end-of-day planning around catalysts, combine this with a closing routine so you can convert raw scans into a cleaner watchlist. A practical companion is Stocks to Watch Tomorrow: A Closing Routine for Swing and Day Traders.

A simple universal scanner template

If you want one framework you can adapt, use this order:

1. Filter for tradability: price, average volume, spread.
2. Filter for activity: relative volume, unusual volume, gap, or range expansion.
3. Filter for setup type: trend continuation, reversal condition, or earnings catalyst.
4. Review chart structure: support, resistance, extension, trend quality.
5. Apply risk rules: stop location, position size, and target logic.

This keeps your process practical. A market scanner should save time, not create another source of information overload.

What to double-check

Before acting on any scan result, run through a short quality-control checklist. This step is where many weak setups get filtered out.

• Liquidity versus appearance: A chart can look clean while still trading poorly. Check spread, order book behavior, and whether the stock can absorb your size.
• Catalyst quality: A move with real news often behaves differently from a move driven only by social chatter. If you use stock sentiment analysis, treat it as context rather than proof. Related reading: Stock Sentiment Analysis Tools Compared: Social, News, and Analyst Signals.
• Extension: Strong names can still be bad entries if they are too far from logical support. Weak names can still be dangerous shorts if the downside move is already mature.
• Time of day: Some scans work better premarket, some after the open, some into the close. A setup found at 9:35 a.m. may mean something very different at 2:45 p.m.
• Market regime: In trend days, momentum scans often produce better follow-through. In choppy sessions, reversal scans may work better, but breakouts can fail more often.
• Sector and index context: A stock moving against its sector may be especially interesting—or especially fragile. Context helps you judge that difference.
• Short squeeze risk: If a stock appears in a momentum scan because it is violently squeezing, understand the risk before chasing. See Short Interest and Days to Cover: How to Spot Squeeze Risk Without Chasing Hype.
• Risk-reward fit: A scanner can identify action, but not whether the trade is worth taking. If your stop is wide and your next resistance is close, it may be a pass. See Risk-Reward Ratio in Trading: When a Good Setup Is Still a Bad Trade.

Then convert the chart idea into a trade plan. Define entry, invalidation, target, and size before the order goes live. If you need help with sizing, review Position Size Calculator Guide: How Traders Decide Share Count Before Entering and How to Use Stop Loss Orders Without Getting Shaken Out Too Early.

Common mistakes

Most scanner problems are not software problems. They are process problems.

Using too many filters

It is tempting to build a highly specific scanner with dozens of conditions. In practice, that often produces either no results or results so overfit that they stop working when conditions shift. Start simple and add only the filters that clearly improve quality.

Confusing activity with opportunity

Just because a stock is on a top gainers today list or showing unusual volume does not mean it offers a good entry. Some stocks are active because they are chaotic. Your scanner should identify candidates, not force trades.

Ignoring the catalyst

A technical setup without context can be misleading. Earnings reactions, legal headlines, offerings, sector sympathy, and macro news can all change how a stock behaves. An earnings stock scanner is strongest when paired with quick headline review.

Not separating intraday scans from swing scans

A momentum stock scanner for day trading may prioritize real-time stock alerts, rapid relative volume shifts, and opening range behavior. A swing trading scanner may care more about daily chart structure, multi-day consolidation, or earnings timing. Mixing those objectives usually creates a noisy list.

Failing to track results

If you never review which scan outputs actually led to tradeable setups, your scanner will not improve. Keep notes on what passed the scan, what you traded, and what worked by regime. A structured review process is covered in Trading Journal Guide: What to Track After Every Stock Trade.

Building scans without drawdown awareness

When your strategy is in a rough patch, changing scanner settings too aggressively can make things worse. Sometimes the issue is not the scan but market conditions or execution quality. If recent losses are stacking up, step back and review Portfolio Drawdown Explained: How Much Loss Is Too Much for Your Strategy.

Treating alternative data as a shortcut

Options flow alerts, dark pool data, and social sentiment can be useful context, but they should support your scan rather than replace it. If you use these tools, understand their limits. For example, Dark Pool Data for Retail Traders: What It Can and Cannot Tell You About Stocks explains why a data point is not the same as a timing signal.

When to revisit

Your stock scanner settings should be reviewed on a schedule, not only after a bad trade. That makes your process more stable and less emotional.

Revisit your scans when:

• Market regime changes: Strong trend, low-volatility chop, earnings season, and macro headline periods can all favor different scan thresholds.
• Your workflow changes: If you switch brokers, chart platforms, alert tools, or start using bot-assisted market analysis, make sure your filters still reflect what you can review in real time.
• Your holding period changes: A move from intraday trading to swing trading requires different scanner logic.
• Liquidity conditions shift: If your account size or typical position size grows, you may need tighter liquidity rules.
• Before seasonal planning cycles: Refresh scans ahead of earnings season, year-end planning, or any period when your schedule changes.
• After a meaningful sample size: Review scans after enough trades or watchlist outcomes to learn something useful, not after one frustrating session.

A practical refresh routine:

1. Pick one scanner only: momentum, reversal, or earnings.
2. Review the last set of names it surfaced.
3. Mark which ones were tradeable, not just active.
4. Identify one filter that improved quality and one that may have excluded too much.
5. Adjust only one or two settings at a time.
6. Test the revised version for a set period before changing it again.

If you want a simple action plan, use this weekly checklist:

• Save one momentum scan for strong continuation names.
• Save one reversal scan for washout or reclaim setups.
• Save one earnings scan for event-driven movers.
• Limit each scan to a manageable review list.
• Pair each scan with a matching trade plan template.
• Log results in your journal.
• Update thresholds only when conditions or tools clearly change.

The best market scanner is not the one that catches every move. It is the one that consistently helps you find setups you understand, can manage, and can review without rushing. Build around your process, keep the filters purposeful, and treat the scan as the first step in decision-making—not the last.