How to Find Stocks to Day Trade: Scanners, Criteria & Workflow

Why Stock Scanners Are Essential

The U.S. stock market has thousands of tradable securities. On any given day, most of them are doing nothing interesting. Your job as a trader is to find the handful of stocks that are setting up for significant moves, and to find them before the move happens or during its early stages.

Stock scanners (also called screeners) automate this filtering process. They continuously scan the entire market using criteria you define and surface the stocks that meet your conditions. Without a scanner, you would need to manually review hundreds or thousands of charts, which is impossible during the fast-paced trading day.

The difference between a profitable trader and a struggling one is often not the strategy itself but the ability to find the right stocks to apply it to. The best gap-and-go strategy in the world is useless if you cannot find the right gapping stocks each morning.

Popular Scanning Tools Compared

Several scanning platforms are available, ranging from free basic screeners to professional-grade tools with AI capabilities.

Trade Ideas is the most advanced scanner for active day traders. It features AI-powered alerts (their Holly AI identifies high-probability setups), real-time streaming scans, backtesting capabilities, and highly customizable filters. The price is approximately $118-$228/month depending on the plan.

Finviz offers a powerful free screener for end-of-day scanning and a paid Elite version ($24.96/month) with real-time data. It excels at fundamental screening and is popular for swing traders. The visual maps and sector performance charts provide quick market overview.

Benzinga Pro focuses on real-time news integration with scanning. If news catalysts drive your strategy, Benzinga Pro surfaces breaking news alongside scanner results. Pricing starts around $79/month.

Broker-built scanners from platforms like thinkorswim, Webull, and Interactive Brokers offer free scanning with your brokerage account. They range from basic to quite powerful and have the advantage of being integrated with your order entry.

Building Your Scanner: Key Criteria

The criteria you use depend on your trading strategy. Here are the most important filters organized by strategy type.

For gap-and-go trading:

• Gap up: 5% or more from previous close
• Relative volume: 2x or higher
• Float: Under 20 million shares
• Price: $2 to $20
• Premarket volume: 100,000+ shares

For momentum trading:

• Relative volume: 3x or higher
• Price change today: Up 5%+
• Average daily volume: 500,000+
• Price: $5 to $100
• News catalyst present

For opening range breakout:

• Run scanner after first 15-30 minutes
• Stocks breaking above/below opening range
• Volume surge at breakout
• Relative volume: 2x+
• Average true range: High enough for profit potential

For swing trading:

• Near 52-week high/low
• Volume increase over 10-day average
• RSI in oversold (below 30) or overbought (above 70) zone
• Sector outperformance/underperformance
• Positive earnings or revenue surprise

From Scanner Results to a Watchlist

Scanner results are raw material, not finished products. The process of converting scanner output into an actionable watchlist requires manual review and judgment.

Step 1: Initial scan. Run your scanner 30-60 minutes before the market opens (for premarket gappers) or during the session (for intraday momentum). Your scanner might produce 10-30 results.

Step 2: News check. For each candidate, quickly check for a legitimate news catalyst. Stocks moving on real news have better follow-through than those moving on technical factors alone.

Step 3: Chart review. Pull up the daily chart for each candidate. Look for key support and resistance levels, the stock's average daily range, and any technical patterns that support or contradict your setup.

Step 4: Float and share structure. Verify the float using a tool like Yahoo Finance or Float Checker. Low-float stocks produce bigger moves but are more volatile and risky.

Step 5: Narrow to 3-8 stocks. Your final watchlist should be small enough to monitor effectively. Trying to watch 20 stocks simultaneously means you watch none of them carefully. Quality focus requires a manageable number of candidates.

Premarket Scanning Routine

For day traders, the premarket scanning routine is the foundation of the trading day. Here is a structured approach.

6:00 - 7:00 AM ET: Check overnight futures, major index direction, and economic calendar for scheduled data releases. This provides market context.

7:00 - 8:00 AM ET: Run your gap scanner. Identify the top gapping stocks with catalysts. Begin chart analysis on the strongest candidates.

8:00 - 9:00 AM ET: Monitor premarket price action on your watchlist. Note premarket high and low levels, VWAP levels, and key daily chart levels. Eliminate candidates that are fading or showing weak premarket patterns.

9:00 - 9:30 AM ET: Finalize your watchlist. Set price alerts at key levels. Review your trading plan for each candidate: entry criteria, stop loss, target. Be ready to execute when the bell rings.

Intraday Scanning Strategies

While premarket scanning focuses on gaps, intraday scanning catches stocks that emerge as trading candidates during the regular session.

New high/low scanners alert you to stocks making new intraday highs or breaking to new intraday lows. These breakouts often signal the start of momentum moves.

Volume surge scanners identify stocks experiencing a sudden spike in volume relative to their recent average. A stock that normally trades 1,000 shares per 5-minute bar suddenly trading 50,000 shares per bar has something unusual happening.

Halted stock scanners alert you when stocks are halted for pending news. Halted stocks often resume with significant price movement, creating trading opportunities.

Relative strength scanners identify stocks outperforming or underperforming the market. During a market selloff, stocks holding green have exceptional relative strength and may be strong buying candidates when the market stabilizes.

Common Scanning Mistakes

Avoid these common errors that reduce the effectiveness of your scanning process.

Too many filters can eliminate valid opportunities. If you require gap > 5%, relative volume > 3x, float < 10M, price between $5-$15, AND sector = technology, your scanner may return zero results on most days. Start with fewer filters and add restrictive criteria only if you are getting too many results.

Ignoring context. Scanners identify stocks meeting quantitative criteria but cannot assess qualitative context. A stock gapping 10% on a vague press release is different from one gapping 10% on a major FDA approval. Always manually verify the quality of the catalyst.

Over-scanning. Running multiple scanners simultaneously and watching dozens of stocks leads to analysis paralysis and poor execution. The trader who finds one excellent setup and executes it well outperforms the trader who identifies twenty setups and executes none of them properly.

Not adjusting for market conditions. Your scanner criteria should evolve with market conditions. In high-volatility markets, raise your gap and volume thresholds because even mediocre stocks will meet low bars. In low-volatility markets, lower your thresholds to find the few stocks with unusual activity.

Building Custom Scans for Your Strategy

Every trading strategy requires specific scanner criteria. Here is how to develop custom scans.

Start with your entry criteria. What conditions must be true for you to enter a trade? Translate these into quantitative scanner filters. If your strategy requires a stock above VWAP with relative volume above 2x, those are your primary filters.

Backtest your scan. Run your scanner historically (if your tool supports it) to see what stocks it would have surfaced on past dates. Review those stocks to confirm that your scan identifies stocks that actually produce the setups you trade.

Refine iteratively. After using your scanner live for a few weeks, review the results. Are you getting too many false positives (stocks that meet criteria but do not produce good trades)? Add a filter. Are you missing obvious candidates? Relax a filter. Treat scanner development as an ongoing process.

Frequently Asked Questions

Do I need a paid scanner or is a free one sufficient?

Free scanners (Finviz, broker-built tools) are sufficient for swing trading and end-of-day analysis. For real-time day trading, a paid scanner like Trade Ideas provides faster data, more customization, and streaming alerts that are difficult to replicate with free tools. Start free and upgrade when you have established a profitable strategy that would benefit from better scanning.

How many stocks should be on my watchlist?

Keep your watchlist to 3-8 stocks for day trading. This allows you to monitor each one effectively and be ready to execute when a setup triggers. For swing trading, a broader watchlist of 10-20 stocks is manageable since you are not monitoring intraday price action.

Should I use the same scanner every day?

Use the same core scanner criteria but adjust parameters based on market conditions. Your core strategy should remain consistent, but filters like minimum gap percentage, volume thresholds, and price ranges may need adjustment for high-volatility versus low-volatility environments.

Can I scan for options trading opportunities?

Yes. Options-specific screeners can filter by unusual options volume, implied volatility changes, put/call ratios, and options flow. Tools like Unusual Whales, Barchart, and Market Chameleon specialize in options scanning.

How do I set up alerts for scanner results?

Most scanning platforms allow you to set audible alerts when a stock meets your criteria. Trade Ideas and thinkorswim both support audio alerts, pop-up notifications, and custom alert windows. Set specific alerts for your highest-priority criteria to avoid missing actionable setups.