There are roughly 8,000 stocks listed on U.S. exchanges. On any given morning, maybe 20 of them are worth your attention as a day trader. Maybe 10. Maybe 5.
Your job isn’t to find all 8,000. Your job is to find the 5 that matter today — the ones with a fresh catalyst, surging volume, and the kind of price action that creates real opportunities. Doing that manually would take hours. A stock screener does it in seconds.
But here’s the thing most beginners get wrong: they open a screener, stare at 60+ available filters, and either freeze up or randomly toggle settings they don’t understand. The result is either a blank screen (too many restrictive filters) or a wall of 500 results (too few filters). Neither is useful.
The screener itself isn’t the skill. Knowing which filters to set and why — that’s the skill. And once you understand the logic behind each filter, you’ll be able to build scans on any platform, adapt them to any market condition, and consistently surface the handful of stocks worth trading each morning.
If you’ve been following this series, you already know what catalysts are and how float and share structure shape a stock’s behavior. Now we’re putting that knowledge into action. This article gives you the complete filter toolkit — the seven filters every day trader needs, the reasoning behind each one, and three ready-to-use scan recipes you can plug into whatever screener you have.
Why Stock Screeners Are Non-Negotiable for Day Traders
A stock screener is a tool that filters thousands of stocks down to a shortlist based on criteria you define. You tell it what you’re looking for — price range, minimum volume, percentage change, float size — and it instantly returns every stock that matches.
Think of it like a search engine for stocks. Google doesn’t make you read every page on the internet to find what you need. A screener doesn’t make you analyze every stock on the exchange.
For day traders specifically, screeners solve a problem that no amount of chart-reading skill can fix: you can’t trade what you can’t find. The market opens at 9:30 AM Eastern. By 9:35, many of the day’s best opportunities are already in motion. If you’re still scrolling through tickers trying to figure out what’s moving, you’re late. Screeners let you walk into the trading day with a shortlist — built on data, not gut feeling — before the opening bell even rings.
Our team runs screeners every single morning as part of our pre-market routine. It’s not optional. It’s the foundation of how we find trades.
Screener vs. Scanner: The Difference That Actually Matters
You’ll see these terms used interchangeably, and for beginners, the distinction is subtle — but worth understanding.
A screener is a filtering tool. You set criteria, and it returns a static list of stocks that currently match those criteria. It’s like running a search query. The results are a snapshot of the market at that moment. Most free tools — Finviz, Yahoo Finance, ChartMill — are screeners. You run a screen, get results, and run it again later if you want updated data.
A scanner is a real-time monitoring tool. It continuously watches the entire market and alerts you the instant a stock meets your criteria. It doesn’t wait for you to hit “search” — it pushes results to you as they happen. This is the difference between checking the weather once in the morning and having a weather app that pings you the second a storm approaches.
For pre-market preparation, a screener is perfectly fine. You run your scan at 8:00 or 9:00 AM, build your watchlist, and you’re set. For monitoring during market hours — catching a stock that suddenly spikes in volume at 10:30 AM or breaks to a new high of day at 1:00 PM — a real-time scanner is significantly more powerful.
The good news: the filters are the same regardless of which type of tool you’re using. Everything you learn in this article applies to both screeners and scanners. The concepts transfer across every platform.
The Core 7 Filters Every Day Trader Needs to Understand
There are dozens of available filters on most platforms. You don’t need most of them. These seven are the ones that actually matter for finding tradeable day trading opportunities — and understanding why each one exists is more important than memorizing specific numbers.
Filter 1: Price Range — Setting the Playground
What it does: Limits your results to stocks within a specific price range.
Why it matters: Price determines your risk per share, how many shares you can afford, and the overall “character” of the stock. Stocks under $1 are penny stock territory — extremely susceptible to manipulation, wide spreads, and erratic behavior that doesn’t follow normal technical patterns. Stocks over $500 require significant capital for even a small position.
Typical day trading settings: Most day traders set a floor between $1 and $5 (depending on risk tolerance) and a ceiling between $100 and $300. The sweet spot for many beginners is $5–$50 — liquid enough to trade, volatile enough to move, and affordable enough to manage position sizes without enormous account requirements.
The logic: You’re not just filtering for affordability. You’re filtering for tradeability. A $0.30 stock that moves $0.05 might look like a 16% gain, but in practice the spread alone could eat most of that move. A $25 stock that moves $2 is an 8% move with far cleaner execution.
Filter 2: Volume — The Liquidity Gatekeeper
What it does: Filters for stocks that have traded at least a minimum number of shares within a specific timeframe (today’s volume, average daily volume, or pre-market volume).
Why it matters: Volume is liquidity, and liquidity is your ability to get in and out of a trade at the price you want. A stock with 50,000 shares traded all day isn’t a day trading candidate — you’ll struggle to fill orders without moving the price against yourself. A stock with 5 million shares traded means there are plenty of buyers and sellers for you to transact with.
Typical day trading settings: Minimum average daily volume of 300,000–500,000 shares is a common baseline. For pre-market scans, a minimum of 50,000–200,000 pre-market shares filters out stocks that are technically gapping but have no real participation behind them. During market hours, higher minimums (500,000+ traded today) help you focus on the most active names.
The logic: Without adequate volume, everything else breaks. Your stop-loss can’t protect you if there’s nobody to buy your shares when you need to sell. Your entry price will slip because the spread is wide. Volume isn’t just a nice-to-have — it’s the prerequisite for everything else.
Filter 3: Percentage Change / Gap Percentage — The Movement Detector
What it does: Filters for stocks that have moved a minimum percentage from a reference point — either the previous day’s close (gap %) or the current day’s open (change %).
Why it matters: Day trading requires intraday price movement. A stock sitting flat at yesterday’s close isn’t providing opportunity. This filter surfaces stocks that are already demonstrating the kind of movement that creates tradeable setups.
Typical day trading settings: For pre-market gap scans, a minimum of 3–5% gap (up or down) is a solid starting point for mid and large-cap stocks. For small-cap and low-float stocks, a minimum of 8–10% pre-market gap is common since these names routinely make larger moves. During regular hours, filtering for stocks up or down at least 2–3% from the open catches intraday momentum.
The logic: Percentage change is what gets a stock “in play” — it’s what gets traders’ attention and draws volume. Stocks that gap significantly almost always have a catalyst behind them, which means the move has a reason. That reason gives you context for evaluating whether the move will continue.
Filter 4: Float — The Volatility Predictor
What it does: Filters for stocks within a specific range of publicly tradeable shares.
Why it matters: You learned this in the previous article — float controls how violently a stock reacts to demand. Low-float stocks (under 10–20 million shares) make huge percentage moves. High-float stocks move more steadily. Filtering by float lets you target the category of behavior you’re looking for.
Typical day trading settings: For momentum and volatility-focused traders: float under 20 million, or under 50 million for a wider net. For traders who prefer steadier price action: float above 50 million or above 100 million. Many traders run separate scans for low-float and high-float stocks because the setups and strategies differ.
The logic: Float is context. Without it, you don’t know whether a 10% gap happened on a stock that routinely makes 10% moves (low float) or one where 10% is a once-a-year event (high float). That distinction changes your entire approach — position size, stop placement, profit targets, everything.
Filter 5: Relative Volume (RVOL) — The “Something Is Different Today” Signal
What it does: Compares a stock’s current volume to its average volume over a recent period. An RVOL of 2.0 means the stock is trading at twice its normal volume. An RVOL of 5.0 means five times normal.
Why it matters: This is arguably the most underappreciated filter in a day trader’s toolkit. Raw volume numbers can be misleading — a stock that trades 10 million shares per day showing 10 million today isn’t unusual. But a stock that normally trades 500,000 shares suddenly trading 3 million? That’s 6x relative volume. Something happened. A catalyst hit. Traders are flooding in.
Typical day trading settings: Minimum RVOL of 1.5x to 2.0x for a basic filter. RVOL above 3x is where things get genuinely interesting. During the pre-market, even RVOL above 5x or 10x isn’t uncommon on catalyst-driven stocks.
The logic: RVOL tells you that today is different from a normal day for this particular stock. It’s the screener equivalent of walking into a restaurant that’s usually half-empty and finding it packed to the walls. Something drew the crowd. That “something” is what you want to trade. We cover relative volume in much deeper detail in our RVOL guide.
Filter 6: Market Cap — The Size Filter
What it does: Filters stocks by total market capitalization (share price × shares outstanding).
Why it matters: Market cap tells you the overall size of the company, which strongly correlates with how the stock behaves. Micro-cap stocks (under $300 million) tend to be the most volatile and most susceptible to manipulation. Small-caps ($300 million–$2 billion) offer strong day trading opportunities with better liquidity. Mid-caps ($2–$10 billion) and large-caps ($10 billion+) trade more orderly.
Typical day trading settings: Many small-cap momentum traders filter for market cap under $500 million or under $1 billion. Large-cap traders might set a floor of $5 billion or $10 billion. The key is matching market cap to your strategy — don’t try to scalp a mega-cap stock with the same approach you’d use on a micro-cap runner.
The logic: Market cap and float often move together (bigger companies tend to have larger floats), but not always. Market cap also acts as a rough proxy for institutional involvement, analyst coverage, and information availability. Bigger companies have more eyes on them, which means fewer surprises — for better or worse.
Filter 7: Average True Range (ATR) — The Movement Potential Gauge
What it does: Measures a stock’s average daily price range over a period (typically 14 days), expressed in dollar terms.
Why it matters: ATR tells you how much a stock typically moves in a day, regardless of direction. A stock with a $3 ATR moves about $3 from low to high on an average day. A stock with a $0.30 ATR barely moves at all. For day traders, ATR is the yardstick for whether a stock has enough range to generate profit after accounting for commissions, spreads, and slippage.
Typical day trading settings: Minimum ATR of $0.50 to $1.00 for lower-priced stocks. For mid-priced stocks ($20–$50), an ATR of $1.50+ ensures there’s sufficient daily range. Some traders filter by ATR as a percentage of price (ATR%) to normalize across different price levels — a $0.50 ATR on a $5 stock is 10%, which is very different from a $0.50 ATR on a $50 stock (just 1%).
The logic: ATR answers a simple question: “If I trade this stock and everything goes according to plan, is there enough potential range to make the trade worthwhile?” If the ATR is too small, the stock can’t move enough to cover your costs and generate a meaningful profit. It’s like fishing in a pond with no fish.
How Filters Work Together: Building a Scan from Scratch
Here’s where the real power of screeners comes alive. Individual filters are useful, but filters working together create a system that consistently surfaces the right stocks.
Think of it as a funnel. You start with the entire universe of 8,000+ stocks and each filter narrows the pool.
Layer 1 — Price Range: You set $2–$100. This eliminates sub-penny stocks and stocks requiring huge capital. You’re probably down to around 5,000 stocks.
Layer 2 — Volume: Minimum 500,000 average daily volume. This strips out the illiquid, untradeable names. Now you’re at maybe 2,000.
Layer 3 — Percentage Change: Up at least 5% from yesterday’s close. Now you’re only looking at stocks that are actually moving. The list drops to maybe 30–60 stocks on an active day.
Layer 4 — Relative Volume: RVOL above 2.0. This removes stocks that gap on weak, unconvincing volume. You’re down to 10–20 stocks.
Layer 5 — Float (optional): Under 50 million shares. If you want to focus on higher-volatility names, this filter tightens the list further. Now you’re at 3–8 stocks.
From 8,000 to 5. In about 10 seconds. That’s what a properly configured screener does.
The critical thing to understand is that every filter is an AND condition. A stock must pass all of them to appear in your results. Adding more filters makes the scan more specific (fewer results, more relevant). Removing filters makes it broader (more results, more noise). The art is finding the balance between too tight (you miss opportunities) and too loose (you’re overwhelmed).
Three Beginner Scan Recipes You Can Use Tomorrow
These are platform-agnostic. The specific parameter names might vary slightly depending on your tool, but the logic works on Finviz, TradingView, Trade Ideas, thinkorswim, or any screener that offers these standard filters.
Recipe 1: The Pre-Market Gap Scanner
Purpose: Find stocks gapping up before the open that are worth watching at the bell.
When to run: 8:00–9:25 AM Eastern, before the market opens.
| Filter | Setting |
|---|---|
| Price | $2 – $100 |
| Pre-Market Gap % | Up at least 5% |
| Pre-Market Volume | At least 100,000 shares |
| Average Daily Volume | At least 300,000 shares |
| Float (optional) | Under 50 million shares |
What to do with results: Sort by gap percentage (highest first). Check each stock for a catalyst — news, earnings, FDA decision, contract announcement. If there’s no identifiable catalyst, skip it. Add the best 2–4 names to your watchlist with key levels marked.
Recipe 2: The Intraday Momentum Scanner
Purpose: Catch stocks making strong moves during market hours that you might have missed at the open.
When to run: Continuously from 9:30 AM – 3:30 PM, or check every 15–30 minutes if using a screener rather than a real-time scanner.
| Filter | Setting |
|---|---|
| Price | $5 – $200 |
| Change from Open | Up at least 3% (or down at least 3% for shorts) |
| Volume Today | At least 500,000 shares |
| Relative Volume | At least 2.0x |
| ATR | At least $0.75 |
What to do with results: Look for stocks with clean chart patterns — consolidation flags, ascending triangles, breakouts above resistance. Confirm volume is supporting the move. Avoid stocks that have already extended too far from VWAP without a pullback.
Recipe 3: The Low-Float Momentum Scanner
Purpose: Find volatile, small-float stocks making outsized moves — the “big movers” list.
When to run: Pre-market or intraday. Use with extra caution — these are the highest-volatility plays.
| Filter | Setting |
|---|---|
| Price | $2 – $20 |
| Float | Under 15 million shares |
| Change % | Up at least 10% |
| Volume Today | At least 200,000 shares |
| Relative Volume | At least 3.0x |
What to do with results: These are high-risk, high-reward candidates. Verify the catalyst is legitimate (not social media hype alone). Check the bid-ask spread — if it’s wider than 1–2% of the stock price, execution costs will be significant. Size your position much smaller than you would on a high-float stock. Always have your stop-loss defined before entry.
A note on these recipes: Treat them as starting points, not final answers. The numbers above are sensible defaults for beginners, but you’ll refine them over time as you develop your own style. Some traders widen the price range. Others tighten the volume filter. The point is to understand the logic so you can adjust intelligently — not just copy settings blindly.
The 5 Most Common Screener Mistakes Beginners Make
Mistake 1: Using Too Many Filters at Once
More filters isn’t always better. If you set 12 filters on a day when only a few stocks are moving, you might get zero results. Start with 4–5 core filters (price, volume, change %, RVOL) and add more only if you’re getting too many results. A scan returning 5–15 stocks is ideal. A scan returning zero is probably too restrictive.
Mistake 2: Setting Unrealistic Parameter Combinations
A stock priced under $3 with a float over 500 million, gapping up 20%, with institutional ownership above 80%? That combination probably doesn’t exist. Understand how filters interact. Low price and high float rarely coexist. Massive gaps on high-volume blue chips are extremely rare. Let reality — not wishful thinking — guide your settings.
Mistake 3: Running a Scan Once and Calling It Done
The market changes throughout the day. A scan run at 8:00 AM might surface completely different stocks than one run at 10:30 AM. Pre-market gappers dominate the morning watchlist, but intraday movers emerge as the session progresses. Run your scans at multiple points throughout the day, or better yet, use a real-time scanner that updates continuously.
Mistake 4: Ignoring the Catalyst Behind the Scan Result
A screener tells you what is moving. It doesn’t tell you why. A stock can pass every filter and still be a terrible trade if the move is driven by a social media pump with no legitimate news behind it. Always verify the catalyst. If you can’t find one, be extremely cautious. As we covered in our catalysts guide — no catalyst, no trade.
Mistake 5: Optimizing Filters for Yesterday’s Market
Beginners tend to backfit their scans to yesterday’s big winner. “That stock that ran 50% had a float under 5 million, so I’ll set my float filter to under 5 million.” The problem? That creates a hyper-narrow scan that would have caught yesterday’s play but misses tomorrow’s — which might have a 12-million-share float. Keep your filters reasonably broad and let the market show you what’s working today.
Free vs. Paid Screeners: What You Actually Need Starting Out
This is one of the most common questions we get from beginners, and the honest answer might surprise you: a free screener is more than enough to start.
Free Options (Solid for Beginners)
Finviz, Yahoo Finance Screener, and TradingView’s free tier all provide the core filters you need — price, volume, percentage change, market cap, and some technical indicators. The main limitation is that most free tools show delayed data (typically 15–20 minutes during market hours). For pre-market scanning, this matters less because you’re building your watchlist before the open anyway. For intraday scanning, the delay can be a real disadvantage.
Paid Options (Worth It When You’re Ready)
The jump to paid tools — real-time scanners like Trade Ideas, TradingView Pro, or broker-native scanners on platforms like thinkorswim — gives you live data, custom alerting, and far more granular filter options including relative volume, short float percentage, and multi-timeframe technical conditions. The real-time scanning capability means stocks appear on your screen the moment they meet your criteria, not 15 minutes later.
Our recommendation: start with free tools. Learn how filters work, develop your scanning habits, and build confidence reading results. When you find yourself consistently needing faster data or more advanced filters, upgrade to a paid scanner. We compare the full landscape of free and paid scanning tools in our Day Trading Toolkit.
The tool doesn’t make the trader. Understanding what you’re scanning for — and why — is what makes the difference. A beginner with a great understanding of filter logic on Finviz will outperform someone mindlessly running a premium scanner with settings they copied from a YouTube video.
What’s Next in Your Day Trading Journey
You now have the complete scanning framework — the seven essential filters, the logic behind each, and three ready-to-use recipes. Next, we’re going to zoom in on one of the most powerful (and most overlooked) filters in that toolkit: relative volume. You’ll learn exactly what RVOL tells you that raw volume can’t, how to interpret different RVOL levels, and why many experienced traders consider it the single best signal that “something is happening” with a stock.
→ Next Article: Understanding Relative Volume: The Signal That Separates Winners from Noise
Frequently Asked Questions
What is a stock screener and how does it work?
Quick Answer: A stock screener is a tool that filters thousands of stocks based on criteria you define — like price, volume, and percentage change — and returns a shortlist of stocks that match.
Think of it like an advanced search engine specifically for stocks. Instead of typing keywords, you set numerical parameters: “Show me stocks priced between $5 and $50 that are up at least 5% today with volume above 500,000 shares.” The screener instantly scans every listed stock and returns only the ones meeting all your criteria. Most screeners update their results periodically (every few minutes), while real-time scanners update continuously and can push alerts to you the moment a stock qualifies.
Key Takeaway: A screener automates the process of finding tradeable stocks. Without one, you’d need hours to do what it does in seconds.
What are the most important stock screener filters for day trading?
Quick Answer: The seven essential filters are price range, volume, percentage change (or gap %), float, relative volume (RVOL), market cap, and average true range (ATR).
Not every scan needs all seven — a basic pre-market gap scan might use just four or five. But understanding what each filter does and why it matters gives you the flexibility to build scans for any situation. Price and volume are the non-negotiable foundation. Percentage change tells you what’s moving. Float and RVOL add the context that separates genuine opportunities from noise.
Key Takeaway: Master these seven filters and you can build effective scans on any platform, in any market condition.
What is the difference between a screener and a scanner?
Quick Answer: A screener returns a static list when you run a search. A scanner monitors the market continuously in real-time and alerts you the instant a stock meets your criteria.
Screeners are like running a Google search — you get results at that moment. Scanners are like setting a Google Alert — they watch for you and notify you when something matches. For pre-market preparation, screeners work fine. For catching opportunities during market hours, a real-time scanner gives you a significant speed advantage. Most free tools are screeners. Most paid tools offer real-time scanning.
Key Takeaway: Both use the same filters. The difference is speed and automation. Start with a screener, upgrade to a scanner when speed becomes a bottleneck.
What price range should I set on my stock screener?
Quick Answer: Most day traders filter for stocks between $2 and $100, with $5–$50 being the sweet spot for beginners who want tradeable stocks without extreme risk.
Stocks under $1 are penny stocks that are highly susceptible to manipulation, poor data, and wide bid-ask spreads. Stocks over $200–$300 require significant capital for meaningful position sizes. The $5–$50 range gives you access to liquid, volatile stocks where small accounts can still take reasonable position sizes and where technical analysis tends to work more reliably.
Key Takeaway: Set a price floor of at least $2–$5 to avoid low-quality names, and a ceiling based on your account size and comfort level.
Why is relative volume more important than raw volume?
Quick Answer: Raw volume tells you how many shares traded. Relative volume tells you whether that number is unusual for this particular stock — and unusual is where the opportunity lives.
A stock trading 2 million shares might sound impressive, but if it averages 5 million per day, today is actually quiet. Conversely, a stock trading 2 million shares that normally trades 200,000 is at 10x relative volume — something significant is happening. RVOL normalizes volume across stocks with different average activity levels, making it a far better detector of “something is different today” than raw numbers alone.
Key Takeaway: Raw volume is a baseline. RVOL tells you whether today is special. Always prioritize RVOL in your scans.
How many stocks should my scan return?
Quick Answer: Aim for 5–15 results. Fewer than 3 suggests your filters are too restrictive. More than 25 means you need to tighten them.
A scan returning 5–15 stocks is manageable — you can quickly review each one, check the catalyst, glance at the chart, and build a focused watchlist. If you get 50+ results, you haven’t filtered enough and you’ll waste time sifting through mediocre candidates. If you get zero or one, loosen a filter or two — the market might just be slow that day, or your parameters might be unrealistically specific.
Key Takeaway: Your scan should do 95% of the work. You do the final 5% — checking catalysts, reading charts, and selecting the best 2–4 names.
Can I use free stock screeners for day trading?
Quick Answer: Yes — free screeners like Finviz, Yahoo Finance, and TradingView’s free tier provide the core filters you need, especially for pre-market preparation.
The main limitation of free tools is data delay. Most free screeners show data that’s 15–20 minutes behind real-time during market hours. This is fine for building your morning watchlist but can be a disadvantage for catching intraday moves. For beginners still learning how to scan and interpret results, free tools are more than sufficient. Upgrade to a paid real-time scanner when you’re consistently trading and need live data.
Key Takeaway: Don’t let a lack of budget stop you from scanning. Free tools are enough to learn the skill that matters — understanding filter logic.
How do I know if a stock screener result is worth trading?
Quick Answer: A scan result is just a candidate, not a trade signal. You still need to verify the catalyst, check the chart, assess the risk, and confirm the setup before entering.
The screener narrows 8,000 stocks to 10. Your job is narrowing 10 to 2–3 by asking: Does this stock have a legitimate catalyst? Is the chart showing a recognizable pattern? Is the risk/reward favorable? Am I comfortable with the position size given this stock’s float and volatility? A scan that passes your filters but has no catalyst, a messy chart, or terrible risk/reward should be passed over without hesitation.
Key Takeaway: The screener finds candidates. You make the trading decisions. Never trade a stock just because it appeared on your scan.
Should I use the same scan settings every day?
Quick Answer: Your core filters should stay consistent, but you should adjust specific parameters based on market conditions — tighter on quiet days, looser on active days.
On a low-volatility day, a scan set for 10%+ gap might return nothing. Lowering it to 5% might surface solid opportunities you’d have missed. On a high-volatility earnings day, you might get 40 results at your normal settings and need to tighten your volume or float filter to narrow the list. The logic of your scan stays the same. The numbers flex with the market.
Key Takeaway: Keep the same filter categories but adjust the thresholds. A rigid scan that never changes will miss opportunities in unusual market conditions.
What is the best time to run stock screener scans?
Quick Answer: Run your primary gap scan between 8:00 and 9:25 AM Eastern (pre-market), then monitor for new setups at 9:45 AM, 10:30 AM, and periodically throughout the session.
The pre-market scan (8:00–9:25 AM) is your most important scan of the day — it builds the watchlist you’ll trade at the open. The 9:45 AM check catches stocks that exploded at the open and are now setting up for continuation. The 10:30 AM scan catches late-morning movers that weren’t on the pre-market radar. After that, running a scan every 30–60 minutes (or using a real-time scanner) ensures you catch any afternoon setups that develop.
Key Takeaway: The morning pre-market scan is mandatory. Intraday scans are a bonus that catches opportunities you’d otherwise miss.
Disclaimer
The information provided in this article is for educational purposes only and should not be considered financial advice. Day trading involves substantial risk and is not suitable for every investor. Past performance is not indicative of future results.
For our complete disclaimer, please visit: https://daytradingtoolkit.com/disclaimer/
Article Sources
Our team built this article on research and data from the following authoritative sources. We encourage you to explore them for deeper context on stock screening and market scanning.
- Investopedia: Stock Screener — Comprehensive definition of stock screeners, how they work, and the most commonly used filter criteria for traders and investors.
- FINRA: Market Data & Transparency — Regulatory context on volume reporting, short interest data, and market transparency that underpins the data screeners display.
- SEC Investor Education: Investor.gov — Official SEC resource on evaluating stocks, understanding market data, and making informed trading decisions.
- StockCharts ChartSchool: Average True Range — Technical explanation of ATR calculation and interpretation for measuring stock volatility and daily range.
- Yahoo Finance: Screener Documentation — Reference for available screening filters, preset scans, and screener functionality on one of the most widely used free platforms.
