There are over 2,000 companies listed on the London Stock Exchange. The New York Stock Exchange and NASDAQ together add another 5,000+. Add AIM, the Tokyo Stock Exchange, Euronext and emerging markets, and the global investable universe runs into the tens of thousands of individual securities. For a private investor sitting at home with limited time, this creates an almost paralysing problem: where do you even begin?
Professional fund managers don't read every annual report. They don't manually check the P/E ratio of every stock in the FTSE 100 one by one. They use tools that do the filtering for them — automatically, in seconds. That tool is a stock screener, and it is arguably the most powerful instrument in the modern investor's toolkit.
In this guide, we'll explain exactly what a stock screener is, how it works, which metrics it uses, and how you can run your first professional-grade screen right now using Fintiq — completely free.
A stock screener is a digital tool that filters an entire market — or multiple markets — down to a shortlist of stocks that meet criteria you define. You set the rules; the screener does the searching.
Think of it like a very sophisticated search engine, but instead of searching websites, it searches company financial data. You might say: "Show me every company in the FTSE 100 where the Price-to-Earnings ratio is below 15, the Return on Equity is above 15%, and the company has grown revenue for at least three consecutive years." Within seconds, the screener returns a ranked list of companies that match those exact criteria.
Without a screener, answering that same question manually would require you to open the financial reports of all 100 FTSE 100 companies, extract the relevant numbers, cross-reference them, and build a comparison spreadsheet — a task that would take days. A screener does it in under a second.
Many beginner investors make one of two mistakes. The first is investing on the basis of tips — from friends, social media, financial news headlines, or popular forums. This is essentially random. The second is investing only in the handful of companies they happen to recognise by name: Tesco, BP, Barclays, HSBC. This ignores the vast majority of investable opportunities.
Both approaches have the same flaw: they do not start from the data. Exceptional investment opportunities exist across the full market, including in companies you've never heard of. A company like Diploma PLC — a specialist industrial distributor listed on the FTSE 250 — has compounded shareholder returns at over 15% annually for more than a decade, yet most retail investors wouldn't name it without checking. A screener would surface it immediately under the right criteria.
If you tried to manually read the annual reports of every company in the FTSE All-Share index, assuming 30 minutes per company, it would take you over 1,000 hours. That's six months of full-time work just to read the reports — before doing any actual analysis. Screeners eliminate this problem entirely.
A stock screener is only as good as the criteria you set. Understanding which metrics matter — and what they mean — is the foundation of effective screening. Here are the most important ones:
The P/E ratio divides a company's share price by its earnings per share. A P/E of 12 means investors are paying £12 for every £1 of annual earnings. Lower P/E ratios can indicate undervaluation; higher ratios typically indicate growth expectations. The FTSE 100 average P/E historically sits between 14 and 16.
ROE measures how efficiently a company uses its shareholders' capital to generate profit. It is calculated as Net Income divided by Shareholders' Equity. A consistently high ROE — above 15% — suggests a business with a genuine competitive advantage. Warren Buffett considers this one of the most important metrics for identifying quality businesses.
A company growing its revenues year-over-year is expanding its business. Screeners allow you to filter for minimum revenue growth rates — for example, requiring at least 5% annual growth over three years — ensuring you focus on businesses that are genuinely expanding rather than stagnating or contracting.
This ratio measures how much a company relies on borrowed money versus shareholder funds. A high debt-to-equity ratio (above 2.0 for most sectors) can indicate financial fragility, particularly during economic downturns when debt servicing becomes more burdensome. Screeners let you filter out highly leveraged companies entirely.
Free cash flow is the cash a company generates after paying for capital expenditure. Unlike reported earnings, which can be manipulated through accounting choices, cash flow is harder to fake. Positive and growing free cash flow is one of the strongest indicators of a financially healthy, self-funding business.
EPS growth measures how profits on a per-share basis are changing over time. Growing EPS means the company is both increasing profits and managing share dilution effectively. Consistent EPS growth over 3-5 years is one of the hallmarks of a compounding business.
This allows you to filter by company size: large-cap (typically above £2 billion), mid-cap (£300 million to £2 billion), or small-cap (below £300 million). Size affects liquidity, risk profile, and the type of returns available.
For income investors, dividend yield — the annual dividend as a percentage of the share price — is critical. Screeners let you set minimum yield thresholds while also filtering for sustainability, ensuring the yield is backed by genuine earnings rather than a company paying out more than it earns.
Fintiq's Fundamental Screener covers stocks across the London Stock Exchange (including FTSE 100, FTSE 250 and AIM), NASDAQ, NYSE, and major international markets. You can set criteria across any combination of the metrics above — and many more — and receive ranked results in real time.
What makes Fintiq different is the Quality Score: a composite 0–100 rating assigned to every stock that combines financial health, profitability, growth momentum and valuation. Rather than only showing you which stocks pass your filters, Fintiq ranks them so the strongest candidates appear at the top. A Quality Score above 70 indicates a strong company; above 85 is exceptional.
The platform is also designed for UK investors specifically. Results display in GBP where relevant, market context accounts for UK accounting standards, and sector comparisons use UK and European peer groups rather than defaulting to US averages.
Here is a concrete example of what a Fintiq screen might look like:
A screen like this, applied to the FTSE 100 in a typical year, might surface companies like a major UK retailer trading at a discount due to sector sentiment, or a financial services business with consistently strong capital returns and a low valuation multiple. The point is not which specific companies appear — that changes with market conditions — but that the screener immediately narrows 100 companies down to 8 genuine candidates worth investigating further.
Without the screener, finding those 8 companies would require reviewing all 100. The screener reduces your workload by 92% before you've spent a single minute on analysis.
Professional-grade stock screening has historically been expensive. Stockopedia, one of the most popular UK screening tools, costs over £300 per year. Simply Wall St costs around £120 per year. Bloomberg Terminal — the gold standard for professional investors — costs approximately £20,000 per year and is simply inaccessible to individual investors.
Fintiq offers fundamental screening, technical analysis, portfolio optimisation, Monte Carlo simulation, and DCF valuation tools — all free. The platform was built specifically for UK retail investors who deserve access to the same quality of analysis tools as institutional investors, without the institutional price tag.
Where Fintiq introduces a Pro tier, it is for advanced masterclass content and deeper analytical features — the core screening capability remains free.
That is your first screen. It takes under two minutes and returns a focused, ranked shortlist from thousands of possibilities.
A screener is a starting point, not a finishing line. This is a critical distinction that every investor should understand before acting on screen results.
A stock passing your screen criteria is a candidate for further analysis, not a buy recommendation. The screener tells you that a company's numbers look interesting based on the criteria you set. It does not tell you:
For these questions, you still need to read the annual report, listen to management presentations, study the competitive landscape, and form a view on the business's long-term trajectory. The screener compresses the search process from weeks to seconds — but it does not replace thinking.
The correct workflow is: use the screener to create a shortlist of 10–15 candidates, then conduct proper qualitative research on each one. You might invest in 3–5 of them after that research. The screener has saved you from having to start that research process across the full market of thousands of companies.
A few practical tips for more effective screening:
Now that you understand what a stock screener is, deepen your knowledge with these related articles:
Use Fintiq's free tools to screen stocks, run Monte Carlo simulations, and optimise your portfolio.
Launch Fintiq Free →