What Is a Stock Scanner and Why Use One?
A scanner runs filters across thousands of symbols in real time or at end of day, returning a short list matching rules you define—e.g., up 4% on 2× average volume above VWAP. Manual chart hopping cannot match that breadth at the open. Scanners save attention; they do not replace setup judgment.
Learn your broker or platform scanner first, then dedicated tools if needed. Consistency of data feed matters for intraday scans.
Which Filters Should Beginners Start With?
Price range (avoid penny stock noise if your strategy does not need it), minimum average volume, percent change, relative volume, and distance from day high/low. Add float, sector, or gap filters as your style clarifies. Too many filters yield zero results; too few yield junk.
Save scan templates per strategy: momentum open, pullback mid-day, swing breakout EOD. Name them clearly and review weekly whether alerts match actual trades taken.
How Do Real-Time and End-of-Day Scans Differ?
Real-time scans drive day trading and intraday momentum—latency and alert noise are challenges. End-of-day scans support swing traders who build next-day watchlists from closing data. Some traders combine both: EOD for plan, real-time for execution triggers.
After the scan, rank results by setup quality—not every hit is an A trade. A tiered watchlist (A/B/C) prevents overtrading scan output.
How Do You Turn Alerts Into Trades?
Define a post-scan checklist: trend aligned, level clear, risk-reward acceptable, news checked. Wait for your entry trigger; alerts are invitations to look, not to click buy. Log alerts that you skipped and why—this tightens filters over time.
Stock scanning pairs with technical analysis and risk management: scan finds candidates, charts qualify them, risk rules size them.
What Mistakes Do New Scanner Users Make?
Chasing every alert without a playbook. Over-filtering until nothing triggers. Ignoring spread and borrow on shorts. Running scans built from someone else’s rules without matching your hold time and risk.
Build scans from your journal’s best trades: what did winners have in common at entry? Encode that, then iterate. Revisit filters monthly: markets change, and a scan that worked in high volatility may need tighter liquidity rules when volume dries up.
How Do Scanners Fit a Daily Routine?
Pre-market: run EOD-derived scans for swing candidates and gap lists for day trading. At the open: switch to real-time scans with pre-defined max results so you are not scrolling hundreds of symbols. Post-close: note which scan hits became trades and which you skipped—this feedback loop improves filters faster than adding new indicators.