How to Research a Company Like a Serious Investor

Why Most Investors Skip the One Thing That Actually Matters

In 2015, a pharmaceutical company called Valeant Pharmaceuticals was the darling of Wall Street. Hedge fund titan Bill Ackman had poured $4 billion of his fund’s capital into it. The stock had risen over 1,000% in five years. Analysts were tripping over themselves to raise their price targets. And then everything fell apart. Congressional hearings, accounting irregularities, a debt load that turned out to be far more dangerous than anyone admitted — the stock crashed over 90% from its peak. Billions of dollars evaporated.

Here is the uncomfortable truth: almost everything investors needed to know was hiding in plain sight. The 10-K annual report showed the debt levels. The earnings call transcripts revealed management’s evasive answers about pricing strategy. The insider selling data showed executives quietly dumping shares while the stock was still near its peak. The information was all there. Most people just never bothered to look.

This is the fundamental paradox of investing in 2026. We live in an era of unprecedented information access. The SEC makes every public filing free to read. Earnings call transcripts are available within hours. Financial data that once required a Bloomberg terminal and $24,000 a year is now accessible through free websites. Yet the vast majority of individual investors still make decisions based on headlines, tips from friends, or whatever stock is trending on social media.

The gap between investors who do serious research and those who do not is enormous — and it is not closing. A 2024 study by the CFA Institute found that individual investors who conducted fundamental research on their holdings outperformed those who relied on tips and trends by an average of 3.2 percentage points annually. Over a 20-year investing career, that difference compounds into hundreds of thousands of dollars. The research does not need to be complicated. It does not require an MBA or a finance degree. But it does need to be systematic, thorough, and honest. This guide will show you exactly how to do it — step by step, using entirely free tools, in a way that even a part-time investor with a full-time job can sustain.

Mastering the 10-K: Your Single Most Powerful Research Tool

If you only read one document about a company before investing, make it the 10-K annual report. Not a news article. Not an analyst summary. Not a Reddit thread. The 10-K. It is the most comprehensive, legally mandated disclosure a public company produces, filed annually with the Securities and Exchange Commission. Companies can spin their stories however they want in press releases and investor presentations, but the 10-K is where they are legally required to tell you the truth — including the ugly parts.

A typical 10-K runs anywhere from 80 to 300 pages. Reading one cover to cover is a commitment, but you do not have to read every word. The key is knowing which sections matter most and what to look for in each one.

Risk Factors: Where Companies Confess Their Weaknesses

Turn to the Risk Factors section first. This is the part of the filing where companies are legally obligated to disclose everything that could go wrong with their business. Most investors skip this section because it reads like boilerplate legalese. That is a mistake. While some risk factors are indeed generic (“we operate in a competitive industry”), the specific and unusual ones often contain the most valuable information.

Look for risk factors that are new compared to the previous year’s filing. When a company adds a new risk factor, it means something has changed. Maybe there is a new regulatory threat, a pending lawsuit, or a customer concentration issue that did not exist before. In 2022, several regional banks added new risk factors related to unrealized losses on their bond portfolios — months before the Silicon Valley Bank collapse made headlines. The warning was there for anyone willing to read it.

Pay special attention to customer concentration risk. If a company derives more than 10% of its revenue from a single customer, it must disclose that. A company with 40% of its revenue coming from one client is fundamentally more fragile than one with thousands of small customers. Similarly, look for geographic concentration — a company earning 80% of its revenue in one country is exposed to that country’s regulatory and economic environment.

Management’s Discussion and Analysis (MD&A): The CEO’s Honest Letter

The MD&A section is where management explains, in their own words, what happened during the year and why. Unlike the CEO’s letter at the front of the annual report (which is usually polished marketing), the MD&A is part of the SEC filing and subject to legal scrutiny. This forces a degree of honesty that you will not find in press releases.

When reading the MD&A, focus on three things:

Revenue trends and explanations. Did revenue grow? Was that growth organic (from selling more products or raising prices) or inorganic (from acquisitions)? A company that grew revenue 20% but acquired a business that contributed 18% of that growth is not really growing — it is buying growth, which is a completely different thing with different implications for future performance.

Margin changes. Are gross margins expanding or contracting? Management will usually explain why. If a software company’s gross margins dropped from 78% to 72%, the MD&A should tell you whether that is because of a shift toward lower-margin services, increased cloud hosting costs, or pricing pressure from competitors. Each explanation has very different implications.

Forward-looking language. Notice how management talks about the future. Are they confident and specific (“we expect to achieve 15% revenue growth in the coming year driven by our new enterprise product line”) or vague and hedging (“we believe we are well-positioned to capitalize on market opportunities”)? Confident specificity tends to correlate with management teams that have genuine visibility into their business.

Segment Data: Understanding What Actually Makes Money

Many large companies report results in business segments. This is where you discover which parts of the company are actually driving value and which ones are dragging it down. Amazon, for example, reports segments including North America, International, and AWS. For years, the retail segments operated at thin or negative margins while AWS generated the vast majority of operating income. Without reading the segment data, an investor might have thought Amazon was a retail company. In reality, it was a cloud computing company that happened to sell books and toothpaste.

Look for segments where revenue is growing but margins are declining — that could indicate competitive pressure. Conversely, a small segment with rapidly expanding margins might be the future growth engine of the entire company. Some of the best investment opportunities come from identifying an underappreciated segment within a larger, well-known company.

Decoding Quarterly Earnings Calls Like a Pro

Every quarter, public companies host earnings calls — typically a 45-to-60-minute conference call where management presents the quarter’s results and then answers questions from Wall Street analysts. These calls are goldmines of qualitative information that you simply cannot extract from the financial statements alone. The numbers tell you what happened. The earnings call tells you why — and often hints at what is coming next.

Where to Find Transcripts

You do not need to listen to earnings calls in real time (though you can — most companies provide a live webcast on their investor relations page). Transcripts are widely available for free or at low cost. Seeking Alpha publishes transcripts for virtually every U.S. public company, usually within a few hours of the call. The Motley Fool also provides transcripts for many companies. The company’s own investor relations website often posts a replay and sometimes a transcript as well.

What to Listen for in Prepared Remarks

The first half of an earnings call is the prepared remarks section, where the CEO, CFO, and sometimes other executives deliver scripted commentary. While this section is polished and rehearsed, it still contains valuable information if you know what to filter for.

Changes in language. If the CEO used the word “robust” to describe demand last quarter and now uses “resilient” or “stable,” that is a downgrade in tone. Language shifts often precede actual performance shifts by one or two quarters. Similarly, watch for changes in how management describes the competitive environment. “Rational” pricing in an industry is good. “Intense” or “aggressive” competitive dynamics is a warning.

Guidance adjustments. Many companies provide forward-looking guidance on revenue, earnings, or other metrics. Pay less attention to whether they beat the current quarter’s estimates (that is already priced in by the time you read the transcript) and more attention to how they are guiding for the next quarter and the full year. Raising guidance is bullish. Maintaining guidance when the market expected a raise is subtly bearish. Lowering guidance is obviously bearish, but the language around it matters — “temporary headwinds” versus “structural challenges” are very different messages.

The Q&A Section: Where the Real Information Lives

The Q&A section is the most valuable part of the earnings call. This is where analysts push back, ask uncomfortable questions, and try to extract information that management did not volunteer in the prepared remarks. Watch for several signals:

Questions management deflects or avoids. If three different analysts ask about the same issue and the CEO gives a non-answer each time, that is itself an answer. Management avoids topics they are worried about. A crisp, confident answer suggests the issue is manageable. A rambling, jargon-heavy deflection suggests it is not.

The CFO’s body language (in tone). When reading transcripts, you lose the visual cues, but you can still detect tone through word choice and sentence structure. A CFO who answers a question about accounts receivable with specific numbers and context is in control. A CFO who responds with “we feel good about our collection trends” without offering any specifics might be hiding deterioration.

Analyst follow-ups. When an analyst asks a follow-up question, it usually means the first answer was insufficient. Multiple follow-ups on the same topic are a red flag. Analysts are professionals with access to their own models and industry contacts — when they are worried about something, you should at least understand why.

Competitive Analysis: Understanding the Battlefield

A company does not exist in a vacuum. Even the best-managed business with the strongest financials can be destroyed by competitive dynamics it cannot control. Understanding a company’s competitive position is just as important as understanding its balance sheet — arguably more so, because competitive dynamics determine what the balance sheet will look like in five years.

Porter’s Five Forces: A Simple Framework That Still Works

Michael Porter introduced his Five Forces framework in 1979, and despite being nearly half a century old, it remains one of the most useful tools for analyzing competitive dynamics. You do not need to write an academic paper about it — just run through each force quickly for any company you are researching:

Threat of new entrants. How easy is it for a new competitor to enter this market? Industries with high barriers to entry — like semiconductor manufacturing (which requires billions in capital), pharmaceuticals (which require years of FDA approvals), or railroads (which require, well, railroads) — tend to protect incumbent companies. Industries with low barriers, like software or e-commerce, are constantly under threat from new entrants, including well-funded startups and big tech companies expanding into adjacent markets.

Bargaining power of suppliers. Does the company depend on a small number of suppliers who could raise prices or restrict supply? Apple, for example, has been steadily reducing its dependence on specific suppliers by developing its own chips. Companies that depend on a single supplier for a critical component are taking on risk that does not show up in the financial statements until something goes wrong.

Bargaining power of buyers. Can customers easily switch to a competitor? Companies with high switching costs — think enterprise software with deep integrations, or banks where customers have mortgages, checking accounts, and credit cards — have more pricing power than companies selling commodity products where buyers can switch with zero friction.

Threat of substitutes. Could a completely different product or technology make this company’s offering obsolete? Kodak was not destroyed by a better film company — it was destroyed by digital photography, a substitute technology. When evaluating a company, think about what technological or behavioral shifts could eliminate the need for its product entirely.

Competitive rivalry. How intense is competition among existing players? Markets with many competitors of similar size tend to compete aggressively on price, which compresses margins for everyone. Markets dominated by a few players (oligopolies) tend to have more rational pricing and higher margins. Check how many competitors exist, how market share is distributed, and whether the industry has a history of price wars.

Identifying Durable Competitive Advantages

Warren Buffett popularized the concept of an economic moat — a durable competitive advantage that protects a company from competitors the way a moat protects a castle. When researching a company, try to identify what its moat is. Common moats include:

Network effects: The product becomes more valuable as more people use it (Visa, Meta, marketplace businesses).

Switching costs: It is expensive, time-consuming, or risky for customers to switch to a competitor (Salesforce, SAP, Oracle).

Cost advantages: The company can produce at lower cost than competitors due to scale, technology, or access to resources (Walmart, Costco, TSMC).

Intangible assets: Patents, brands, regulatory licenses, or proprietary data that competitors cannot easily replicate (Disney’s IP portfolio, pharmaceutical patents, Google’s search data).

The most dangerous investment mistake is paying a premium price for a company you believe has a moat that turns out to be eroding. Nokia had a brand moat in mobile phones — until the iPhone made it irrelevant in three years. Always ask: is this moat getting stronger or weaker? What would it take to breach it?

Following the Smart Money: Insider and Institutional Tracking

There is an old saying on Wall Street: there are many reasons an insider might sell a stock (taxes, diversification, a divorce, a new house), but there is really only one reason an insider buys — they think the stock is going up. Tracking insider transactions will not give you a crystal ball, but it provides a valuable data point that most individual investors overlook entirely.

Insider Buying and Selling: SEC Form 4

Corporate insiders — officers, directors, and shareholders who own more than 10% of a company — are required to report their trades to the SEC within two business days on SEC Form 4. These filings are public and free to access on SEC EDGAR.

What to look for:

Cluster buying. A single insider buying a small amount of stock might not mean much. But when multiple insiders — the CEO, CFO, and two board members — all buy significant amounts of stock within a few weeks of each other, that is a strong positive signal. It means the people who know the most about the company are willing to put their own money on the line.

Purchase size relative to their holdings and compensation. A CEO who earns $15 million a year buying $50,000 worth of stock is a rounding error. The same CEO buying $2 million worth of stock is making a meaningful bet. Look at the dollar amount in context.

Selling patterns. Insider selling is harder to interpret because there are many legitimate reasons to sell. The most informative signal is unusual selling — an insider who has not sold in years suddenly liquidating a large position, or multiple insiders selling large amounts at the same time. Also watch for selling that occurs right before bad news, though that could indicate illegal insider trading rather than a legitimate research signal.

10b5-1 plans. Many insiders sell through pre-scheduled trading plans called 10b5-1 plans. These are set up in advance and execute automatically, so sales under these plans are less informative about the insider’s current view of the stock. Form 4 filings usually indicate whether a transaction was made under a 10b5-1 plan. Focus your attention on transactions that are not part of a pre-scheduled plan.

Institutional Ownership: 13-F Filings

Institutional investors — mutual funds, hedge funds, pension funds, and endowments — that manage more than $100 million in assets must file a 13-F report with the SEC every quarter, disclosing their holdings. These filings are available on EDGAR and aggregated by several free websites.

Institutional ownership analysis is not about blindly copying what big funds are doing. By the time a 13-F is filed (up to 45 days after the end of the quarter), the fund may have already changed its position. Instead, use 13-F data for these purposes:

Ownership quality. Is the company owned primarily by index funds (which own it because they must, not because they chose to), or by concentrated, high-conviction active managers who chose to buy it after doing deep research? High ownership by respected fundamental investors like Berkshire Hathaway, Baupost Group, or Greenlight Capital is a positive signal — it suggests the stock has passed the rigorous standards of professional analysts.

Changes in ownership. More important than who owns the stock is how ownership is changing. If several respected funds increased their positions substantially in the same quarter, that is worth investigating. Conversely, if multiple institutional holders are trimming or exiting their positions, that warrants caution.

Concentration. If one or two institutions own a very large percentage of the float, the stock may be vulnerable to sharp declines if those holders decide to sell. Concentrated institutional ownership can create liquidity risk.

The Free Research Toolkit: Tools Every Investor Should Know

One of the greatest advantages individual investors have today is access to research tools that would have cost thousands of dollars a decade ago. You do not need a Bloomberg terminal or a Capital IQ subscription to do serious fundamental research. The following tools are all free (or have robust free tiers) and together provide everything you need to research a company thoroughly.

Getting the Most Out of SEC EDGAR

EDGAR is the foundation of all serious company research. Here is how to use it efficiently. Go to EDGAR’s full-text search (EFTS) and you can search for specific terms across all filings. This is incredibly powerful. You can search for a company name across all 10-K filings in an entire industry to see how often competitors mention them — a clever way to gauge competitive relevance.

When looking up a specific company, use the company search page and filter by filing type. The most important filing types for investors are:

10-K: Annual report. Your primary research document.

10-Q: Quarterly report. A smaller version of the 10-K filed for each of the three non-annual quarters.

8-K: Current report. Filed whenever something material happens — a merger, a CEO departure, a restatement of financials, a major contract. Set up alerts for your holdings to be notified when new 8-Ks are filed.

DEF 14A: Proxy statement. Contains executive compensation details, board member information, and shareholder vote items. This tells you how much management is paying itself and whether their incentives are aligned with shareholders.

Form 4: Insider transaction reports.

13-F: Quarterly institutional holdings reports.

Building a Research Workflow with Free Tools

Here is a practical workflow that combines these tools effectively:

Step 1: Start with Finviz to get a quick snapshot of the company — its key ratios, recent price performance, and sector context. This takes two minutes and gives you a high-level feel for the stock.

Step 2: Pull up the company on Macrotrends to see long-term financial trends. Is revenue growing? Are margins stable or deteriorating? How has the debt load changed over time? This gives you 10+ years of context in visual form.

Step 3: Read the most recent 10-K on EDGAR, focusing on Risk Factors, MD&A, and Segment Data. This is the deep work — plan for 60-90 minutes on your first read.

Step 4: Read the last two earnings call transcripts on Seeking Alpha. Focus on the Q&A sections. Note any topics analysts are pressing management on.

Step 5: Check insider activity on OpenInsider and institutional ownership trends on WhaleWisdom. Are insiders buying or selling? Are respected funds increasing or decreasing their positions?

Step 6: Use GuruFocus to check valuation. Is the stock trading above or below its historical averages on metrics like PE, EV/EBITDA, and price-to-free-cash-flow? How does its valuation compare to peers?

Building Your Investment Thesis and Research Journal

All the research in the world is useless if you do not organize it into a coherent argument for or against investing in a company. This is where the investment thesis comes in — a concise document that summarizes why you believe a stock is worth buying, what you think it is worth, and what would have to change for you to sell it.

How to Write an Investment Thesis

Your investment thesis does not need to be long. One to two pages is ideal. It should cover the following elements:

The business in one paragraph. What does the company do? How does it make money? Who are its customers? If you cannot explain this simply, you probably do not understand the business well enough to invest in it. Peter Lynch famously advised investors to only buy stocks they could explain to a ten-year-old. That might be slightly extreme, but the principle is sound — clarity of understanding is the foundation of a good investment.

The investment case (3-5 bullet points). Why is this stock attractive right now? Maybe the company is growing revenue at 25% per year in a market that is expanding. Maybe it has a dominant market position with high switching costs. Maybe it is undervalued relative to its peers because of a temporary issue that you believe will be resolved. Each bullet point should be specific and supported by data from your research.

The valuation. What do you think the stock is worth? You do not need a 50-row discounted cash flow model (though you can build one if you want). At minimum, compare the stock’s current valuation metrics (PE ratio, EV/EBITDA, price-to-free-cash-flow) to its own historical averages and to its closest peers. If the stock is trading at 30x earnings but its five-year average is 20x and its peers trade at 15x, you need a very good reason to believe this premium is justified.

Key risks (3-5 bullet points). What could go wrong? Be honest here. Every investment has risks. A good thesis does not ignore risks — it acknowledges them and explains why you believe the potential reward justifies them. Pull directly from the Risk Factors section of the 10-K and from the competitive analysis you have already done.

The sell criteria. This is the most important and most overlooked part of the thesis. Define in advance what would cause you to sell. Maybe it is “if revenue growth declines below 10% for two consecutive quarters.” Maybe it is “if the CEO departs.” Maybe it is “if the stock reaches my price target of $X.” Having pre-defined sell criteria protects you from the two most destructive investor emotions: greed (holding too long because the stock keeps going up) and fear (panic-selling during a temporary dip).

Maintaining a Research Journal

Beyond the investment thesis, consider maintaining a research journal. This is a running log of your thoughts, observations, and decisions about each stock you own or are considering. It serves two critical purposes:

It creates accountability. When you write down your reasons for buying a stock and review them later, you build a feedback loop that improves your decision-making over time. You can identify patterns in your thinking — maybe you tend to be too optimistic about growth companies, or too quick to sell during market corrections. Without a written record, these patterns are invisible.

It reduces emotional decision-making. When a stock drops 20% and your gut tells you to sell, you can open your research journal and re-read your original thesis. If nothing fundamental has changed — the business is still executing, the competitive position is intact, the drop was caused by overall market sentiment rather than company-specific bad news — then the journal gives you the confidence to hold or even buy more.

Your research journal can be as simple as a Google Doc or a spreadsheet. For each holding, record:

• Date of purchase and purchase price
• Your investment thesis (link to or paste the thesis document)
• Quarterly notes after each earnings report — did the company meet your expectations?
• Any changes to your thesis — new information that strengthens or weakens the case
• Date and reason for any sales

How Much Research Is Enough? A Guide for Part-Time Investors

Here is the question that every individual investor eventually asks: when do I stop researching and actually make a decision? The answer is nuanced, because there is a real danger in both extremes. Too little research, and you are essentially gambling. Too much research, and you fall into analysis paralysis — endlessly seeking one more data point, one more earnings transcript, one more analyst report, while the opportunity passes you by.

The Minimum Viable Research Checklist

Before investing in any individual stock, you should be able to answer these questions with confidence:

Total time: approximately 3 to 5 hours for a first-time deep dive on a company. That might sound like a lot if you are used to buying stocks based on a 30-second glance at a chart. But consider what is at stake. If you are investing $10,000 or more in a single stock, spending 4 hours to make sure it is a sound investment is an extraordinarily high return on your time. If that research helps you avoid even one 30% loss, you have saved $3,000 — the equivalent of earning $750 per hour for your research time.

Ongoing Monitoring: Staying Informed Without Obsessing

After the initial deep dive, maintaining your research does not require nearly as much time. For each stock you own, plan on:

Quarterly check-in (60-90 minutes): After each earnings report, read the earnings call transcript and update your research journal. Did the company meet your expectations? Is the thesis still intact? Has anything materially changed?

Annual deep dive (2-3 hours): Once a year, when the new 10-K is filed, do a fresh read of the Risk Factors and MD&A sections. Compare to the previous year. Update your investment thesis if needed.

News monitoring (5-10 minutes daily): Set up Google Alerts or use Yahoo Finance’s portfolio tracker to get notified of significant news. You do not need to read every article — just scan headlines for anything that might affect your thesis. Most days, there will be nothing important.

Research Shortcuts That Are Not Worth Taking

Let me be blunt about what does not count as research, even though many investors treat these as substitutes:

Reading only bullish analysis. Confirmation bias is the investor’s worst enemy. If you are researching a stock you are excited about, actively seek out bearish arguments. Search for “[company name] bear case” and force yourself to understand why smart people might disagree with you. If you cannot articulate the bear case for your own holdings, your research is not complete.

Relying on price targets. Analyst price targets are educated guesses based on models full of assumptions. They are frequently wrong and frequently revised. Use them as one input among many, not as the basis for your decision.

Social media consensus. The fact that a stock is popular on Reddit, Twitter, or a Discord server tells you nothing about its fundamental value. Crowd enthusiasm can drive prices above fair value for extended periods, but it always ends the same way. Do your own work.

Looking only at the stock chart. A stock that has gone up 200% in a year might be more overvalued now than ever, or it might still be undervalued because the business has improved even faster than the stock price. The chart tells you what happened. Only fundamental research tells you what it means.

Conclusion: Research Is Your Edge

In a market increasingly dominated by algorithmic trading, passive index funds, and social media-driven speculation, the individual investor who does serious fundamental research has a genuine edge. Not because your analysis will be better than Goldman Sachs’s — it will not be. But because your time horizon is different. You do not have quarterly performance pressure from clients. You do not have to explain a bad quarter to a board of directors. You can buy a stock at a fair price and hold it for five years while the thesis plays out. That is an enormous structural advantage, but only if you have actually done the research to know what you own and why you own it.

The tools are free. The filings are public. The earnings call transcripts are available to anyone with an internet connection. The information asymmetry that once existed between Wall Street professionals and individual investors has been dramatically reduced. What has not been reduced is the effort asymmetry — the gap between investors who do the work and those who do not.

Start with one company. Maybe it is a stock you already own, or one you have been thinking about buying. Pull up the 10-K on EDGAR. Read the Risk Factors. Read the MD&A. Listen to the most recent earnings call. Check what insiders are doing. Build a one-page investment thesis. Write down your sell criteria. The whole process might take a single Saturday afternoon, and it will transform your relationship with that investment from speculation to conviction.

Then do it again for the next company. And the next. Over time, this process becomes faster as you develop pattern recognition — you start noticing when a company’s language is evasive, when margins are deteriorating for structural rather than temporary reasons, when insider selling looks worrying rather than routine. You build what Charlie Munger called “latticework of mental models” that compound over time, making each new analysis richer and more insightful than the last.

The most important thing is to start. Imperfect research is infinitely better than no research. A 3-hour deep dive will not catch everything, but it will catch the obvious problems — the ones that blow up other investors’ portfolios because they never looked. And in investing, avoiding the big mistakes matters at least as much as finding the big winners.

Do the work. Read the filings. Build the thesis. Keep the journal. Your future self — the one looking at a portfolio shaped by knowledge rather than luck — will thank you.

References

• U.S. Securities and Exchange Commission — EDGAR Full-Text Search System: https://efts.sec.gov/LATEST/search-index
• SEC — How to Read a 10-K/10-Q: https://www.sec.gov/oiea/Article/edgarguide.html
• SEC — Forms 3, 4, 5 (Insider Transactions): https://www.sec.gov/about/forms/form4.pdf
• SEC — Form 13-F Information: https://www.sec.gov/divisions/investment/13ffaq.htm
• Porter, Michael E. “The Five Competitive Forces That Shape Strategy.” Harvard Business Review, January 2008.
• Buffett, Warren. Berkshire Hathaway Annual Shareholder Letters (1977–2025): https://www.berkshirehathaway.com/letters/letters.html
• Lynch, Peter. One Up on Wall Street. Simon & Schuster, 1989.
• Marks, Howard. The Most Important Thing: Uncommon Sense for the Thoughtful Investor. Columbia University Press, 2011.
• CFA Institute — Investor Trust Study: https://www.cfainstitute.org
• Yahoo Finance: https://finance.yahoo.com
• Macrotrends — Stock Financial Data: https://www.macrotrends.net
• Finviz — Stock Screener: https://finviz.com
• GuruFocus — Value Investing Tools: https://www.gurufocus.com
• OpenInsider — Insider Trading Data: http://openinsider.com
• WhaleWisdom — 13-F Filing Tracker: https://whalewisdom.com