Stock Screener
A tool that filters thousands of stocks in real time using programmable criteria — volume, ATR percentage, gap size, relative volume, RSI range, float, and more — to surface a short list of candidates that meet a trader's specific setup requirements.
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Explained Simply
Every trading day, thousands of stocks are moving simultaneously. Without a screener, a trader is limited to a manually maintained watchlist of 10–30 names. A stock screener solves this by applying a ruleset to the entire tradable universe — thousands of stocks — and returning only the candidates that meet every condition simultaneously.
How a Stock Screener Works
At its core, a screener is a filter engine. You define conditions; the screener returns stocks where every condition is true. The conditions can be as simple as 'price > $5 AND volume > 500,000' or as complex as a multi-layer scoring system that weights dozens of technical and fundamental inputs.
Essential Day Trading Screener Filters:
1. Minimum Price Set a floor (typically $2–$5 for small accounts, $10+ for cleaner setups) to exclude sub-penny stocks and illiquid micro-caps. Very low-priced stocks have wide spreads relative to price and are prone to manipulation.
2. Minimum Volume Filter for stocks with at least 500,000 shares of average daily volume (1M+ preferred). High volume means tight spreads, easy entry and exit, and reliable technical levels. Illiquid stocks gap violently and don't respect support/resistance levels.
3. Relative Volume (RelVol) Relative volume compares today's volume to the average volume for this time of day. A stock with 3× relative volume is experiencing unusual activity — a catalyst (news, earnings, FDA announcement) is typically driving the move. Set a minimum of 1.5× to 2× for quality candidates.
4. ATR Percentage ATR% (Average True Range as a percentage of price) measures how much a stock typically moves each day. Day traders need range — a stock moving 0.3% per day offers little opportunity, while one moving 4–8% daily provides enough room for entries, stops, and targets. Filter for ATR% of 2–10% depending on your style.
5. Gap Percentage A gap occurs when the opening price is significantly above or below the previous day's close, typically driven by overnight news. Filter for gaps of 3–15% for pure gap-and-go strategies. Very large gaps (>30%) can signal over-extension and reversal candidates.
6. Float Float is the number of shares available for public trading. Low-float stocks (under 20 million shares) can move violently on moderate volume because supply is limited. Traders targeting explosive intraday moves often filter for float under 10–15 million.
7. RSI Range The Relative Strength Index filters for momentum conditions. RSI above 60 identifies momentum trending stocks. RSI below 40 at support identifies potential oversold bounce candidates. Most screeners also support RSI divergence scans.
8. Price Change Percentage Filter for stocks up or down a significant percentage (e.g., +3% to +20% for long setups) to focus on names already in motion. Stocks that start moving early in the session often continue in the same direction.
Static vs. Dynamic Screeners
Static screeners run on demand — you click 'Scan' and get a snapshot. Dynamic (real-time) screeners update continuously throughout the trading session, alerting you as new stocks meet your criteria. For day trading, real-time dynamic screeners are essential; a setup that appeared at 9:45 AM may be gone by 10:15 AM.
Composite Scoring
Advanced screeners go beyond pass/fail filtering to score each candidate on a composite metric. Rather than returning every stock that passes every filter, a scored screener ranks candidates by overall quality — weighting factors like relative volume (more weight), ATR% (more weight), and gap percentage (moderate weight) — and surfaces the top 5–10 candidates rather than the top 100. This reduces decision fatigue and focuses attention on the highest-quality setups.
Essential Stock Screener Filters for Day Trading
The most effective day trading screeners apply a layered filter stack. Start with hard gates that eliminate untradeable candidates: minimum price ($2–$5), minimum average daily volume (500K+), and exchange listing (NYSE/NASDAQ only to exclude OTC). Then apply momentum filters: relative volume above 1.5×, ATR% above 2%, and a price change of at least 3% from the prior close. Finally, apply setup-specific filters: RSI range, gap %, and float size based on your strategy. Running all filters simultaneously — not sequentially — ensures candidates meet every condition at once rather than passing on any single dimension.
Composite scoring improves on binary pass/fail filtering by ranking candidates across all metrics simultaneously. A stock scoring in the top quartile on relative volume AND ATR% AND gap% is a higher-quality candidate than one that narrowly passes each threshold.
Real-Time vs. Static Screeners
Static screeners return a snapshot of the market at the moment you click 'scan.' Dynamic (real-time) screeners update continuously, alerting you as new stocks meet your criteria throughout the trading session. For day trading, real-time screeners are essential — a momentum setup that emerged at 9:45 AM may be fully extended by 10:00 AM. The practical advantage of real-time scanning is capturing setups in their early-stage development when entry risk/reward is best.
Besides speed, the architecture matters. Server-side real-time scanners (running on dedicated cloud infrastructure scanning every tick) outperform client-side screeners that only update when you are connected. Professional scanners like Trade-Ideas and Tradewink's DayTradeScreener run server-side, continuously, even when you are not watching.
Avoiding Common Screener Mistakes
The most frequent screener mistake is optimizing filters to past market conditions without validating forward. If you build filters that would have caught last week's big movers, those same filters may over-screen in different market conditions. Test your screener across different market regimes — low-volatility bull, high-VIX choppy, and bear market conditions — to ensure it produces quality candidates in all environments.
A second common mistake is using too many filters simultaneously, which can produce zero results on slow market days. Maintain a tiered approach: a core filter set (relative volume + ATR%) that always runs, and optional additional filters (RSI range, float cap) that you apply when you want to narrow from a large candidate list.
How to Use Stock Screener
- 1
Choose a Screener Platform
Popular screeners: Finviz (free, web-based), TradingView (advanced, free tier), Trade Ideas (AI-powered, paid), TC2000 (real-time scanning). Choose based on your needs: Finviz for end-of-day screens, TradingView/Trade Ideas for real-time intraday scanning.
- 2
Set Your Primary Filters
Start with the essentials: price range ($5-200), average volume (>500K), market cap (>$300M). These ensure you're only looking at liquid, tradeable stocks. Add country (US) and exchange (NYSE, NASDAQ) to exclude OTC/penny stocks.
- 3
Add Technical Filters
For momentum: RSI above 50, price above 20 SMA, new 52-week high. For mean reversion: RSI below 30, price below lower Bollinger Band. For breakouts: price within 2% of 52-week high, above-average volume today.
- 4
Add Fundamental Filters (Optional)
For quality: P/E below 25, revenue growth above 10%, positive EPS. For value: P/E below industry average, price-to-book below 2. For growth: revenue growth above 20%, earnings growth above 15%. Combine technical and fundamental for the strongest screens.
- 5
Save and Automate Your Screens
Save your best-performing screens as presets. Run them daily (end-of-day screens) or continuously (real-time scanners). Over time, refine the filters based on which screened stocks actually moved as expected. The best screen is one that consistently surfaces profitable setups.
Frequently Asked Questions
What are the most important filters for a day trading screener?
Relative volume is the single most important filter — it tells you something is happening right now (news, catalyst, unusual activity). Pair it with ATR% (ensures the stock has enough daily range to make trading worthwhile) and minimum absolute volume (ensures liquidity). Those three filters alone dramatically improve scan quality. Everything else — RSI range, gap %, float — is secondary refinement based on your specific strategy.
What is a good relative volume threshold for day trading?
A minimum of 1.5× relative volume at market open is the floor. 2× is better. 3× or higher usually indicates a significant catalyst (news, earnings, FDA decision) and often produces the most explosive intraday moves. Relative volume context matters — a 3× reading at 9:35 AM in the first 5 minutes of trading is more meaningful than the same reading at 3:45 PM when volume naturally spikes into the close.
Should I use a stock screener or a fixed watchlist?
Both. A fixed watchlist provides familiarity — you learn the behavior of specific tickers, their typical ranges, where they tend to find support and resistance. A dynamic screener finds opportunities you would never see in your watchlist. The best approach: start your day by running the screener to catch high-relative-volume movers, then manage your existing watchlist positions. Tradewink blends both by scanning the watchlist first (with a score bonus) then filling out with screener candidates.
How do I avoid false signals from a screener?
Require confluence — a stock must pass multiple filters simultaneously, not just one. A stock with 10× relative volume but a $0.50 price is a penny stock, not a real opportunity. A stock with a 15% gap but only $200K daily volume will be impossible to trade with real size. Composite scoring (weighting multiple factors) is more reliable than any single filter threshold. Also confirm with chart context — the screener finds candidates; the chart tells you whether the setup is worth trading.
How Tradewink Uses Stock Screener
Tradewink's DayTradeScreener implements a multi-stage composite scoring pipeline. Stage 1 applies hard gates (minimum volume, price, market hours) to eliminate untradeable candidates quickly. Stage 2 scores survivors on six primary metrics: relative volume (highest weight), ATR% (high weight), gap percentage, RSI, 52-week proximity score (how close to 52-week high/low), and day range efficiency. A candidate must exceed minimum thresholds on at least four of six metrics to advance. Stage 3 merges user watchlist tickers (which receive a +15 point boost) with dynamically sourced candidates from Finviz's top movers feed and the S&P 500 heatmap. Stage 4 feeds the top 25–30 ranked candidates to the AI conviction engine for deep evaluation. The result is a ranked shortlist of 5–15 candidates ordered by composite score, with watchlist tickers always surfaced first.
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See Stock Screener in real trade signals
Tradewink uses stock screener as part of its AI signal pipeline. Get daily trade ideas with full analysis — free to start.