How Warren Buffett Picks Stocks: 12 Principles

How Warren Buffett picks stocks is one of the most studied questions in modern investing, and the cleanest answer is the twelve-point framework Robert Hagstrom set out in The Warren Buffett Way. It is not a magic formula. It is a checklist of questions Buffett has used, in some form, to filter every position Berkshire Hathaway has ever taken.

This article walks through all twelve, grouped under the four headings Hagstrom uses: business tenets, management tenets, financial tenets, and value tenets. At the end we look at how realistic any of this is for a UK retail investor with an ISA, and what to do if the honest answer is "not very".

Contents

• The four buckets behind Buffett's investment principles
• Business tenets: is this a business I can understand?
• Management tenets: are the people in charge worth trusting?
• Financial tenets: do the numbers stack up?
• Value tenets: is the price worth paying?
• Can UK investors actually apply this?
• The simple alternative: just buy Berkshire
• Frequently asked questions

The Four Buckets Behind Buffett's Investment Principles

Buffett's investment principles split into four questions, applied in order. Is this a business I can understand? Is it run by people I can trust? Do the numbers stack up? Is the price low enough to make the bet worth taking?

Skip any one of the four and you have either a punt, a story stock, or a value trap dressed up as a bargain. Buffett's edge is not that he is cleverer than the market on any single tenet. It is that he refuses to compromise on any of them.

Business Tenets: Is This a Business I Can Understand?

1. The business is simple and understandable

Buffett famously will not invest in a company whose business model he cannot explain in a couple of sentences. This is the "circle of competence" idea. Coca-Cola sells sugar water under the most recognisable brand on Earth. See's Candies sells boxed chocolates. Both pass. A pre-revenue gene-editing startup, however interesting, does not.

For UK investors, the test is uncomfortably narrowing. Diageo, Unilever, Tesco and Sainsbury's pass easily. AstraZeneca and GSK do not, unless you genuinely understand drug pipelines. Be honest with yourself. If you cannot describe how the company makes money without using the phrase "it's complicated", move on.

2. The business has a consistent operating history

Buffett wants companies with a long track record of doing the same thing, profitably, through different economic conditions. Not turnarounds. Not "this time is different" growth stories. Boring, repeatable cash generation.

The reason is statistical. A business that has earned a high return on capital for twenty years through recessions, rate cycles and management changes is far more likely to keep doing so than one that has only just become profitable. Predictability is the moat behind the moat.

3. The business has favourable long-term prospects

The third business tenet is what Buffett calls a "consumer monopoly". Pricing power. The ability to push prices through inflation without losing customers. Brands like Apple, Coca-Cola and American Express all qualify. So do certain UK-listed names: RELX, Experian, Diageo, LSEG.

Commodity businesses fail this test by definition. If you sell something indistinguishable from your competitor's product (steel, oil, basic chemicals, airline seats), you cannot raise prices, and your long-term economics are determined by other people's behaviour, not yours.

Management Tenets: Are the People in Charge Worth Trusting?

4. Management is rational about capital allocation

Buffett judges CEOs primarily on what they do with the cash the business generates. There are five options: reinvest in the business, acquire other businesses, pay down debt, pay dividends, or buy back shares. The right answer depends on the return available from each.

The red flag is empire-building. CEOs who keep acquiring at silly prices because they want a bigger company to run, rather than because the acquisition earns its keep. If you read an annual report and the CEO talks about "scale" without talking about returns on the capital deployed to get that scale, take the hint.

5. Management is candid with shareholders

Buffett wants management to talk to shareholders the way they would talk to a partner who owned the whole business. Plain English. Mistakes acknowledged. Future risks named, not buried. His own annual letters are the model.

In practice this means reading the chairman's statement in the annual report and asking: is this person being honest, or are they spinning? UK-listed financial-services companies have a particularly bad record on this. So do mining companies after a write-down. You can spot the spin if you train yourself to look for it.

6. Management resists the institutional imperative

The "institutional imperative" is Buffett's term for the tendency of corporate managers to mimic each other, regardless of whether the behaviour makes sense. If competitors are issuing junk bonds, "we" issue junk bonds. If competitors are diversifying into adjacent businesses, "we" diversify. If competitors are doing buybacks at all-time-high valuations, "we" do buybacks at all-time-high valuations.

A management team that ignores fashion and does only what is genuinely in shareholders' interest is rare. When you find one, you have found something valuable.

Financial Tenets: Do the Numbers Stack Up?

7. Focus on return on equity, not earnings per share

EPS growth is the number companies love to brag about. The problem is that you can grow EPS just by retaining earnings and earning a mediocre return on them. Return on equity (ROE) is the honest measure: how much profit the business earns on every pound of shareholder capital it retains.

Buffett's rule of thumb is a sustained ROE above 15%, ideally without significant leverage to manufacture it. Anything below that means the business is not actually compounding shareholder capital faster than the broad market would.

8. Calculate "owner earnings", not reported earnings

Reported net income is full of accounting choices. Buffett prefers what he calls owner earnings: net income, plus depreciation and amortisation, minus the capital expenditure the business genuinely needs to maintain its position. In modern language, this is close to free cash flow.

The difference matters. A railway with £1bn in reported earnings but £1.2bn in maintenance capex is not really earning a billion. A consumer-goods business with £1bn in reported earnings and £100m in maintenance capex really is. Owner earnings strip out the accounting and tell you what is actually left for shareholders.

9. The business has high profit margins

High margins do two things at once: they prove the business has pricing power, and they give it a buffer when costs rise. Buffett does not have a fixed cut-off. He looks at margins relative to the industry and over time.

Falling margins year after year are a sell signal even if revenue is growing. Rising margins on flat revenue often mean the business is becoming a better one. For a UK investor running this filter, compare operating margin against the company's own five-year average and against direct competitors. Trend matters more than absolute level.

10. For every £1 retained, the business should create at least £1 of market value

This is the "one-dollar premise" and it is the most ruthless of the financial tenets. Take the company's retained earnings over a five or ten year period. Has the market capitalisation grown by at least that much? If not, the business is destroying value by retaining cash it should have paid out.

Apply this test to the FTSE 100 and a lot of household names fail. It is a brutally simple way to separate businesses that are genuinely compounding from businesses that are simply growing.

Value Tenets: Is the Price Worth Paying?

11. Determine the intrinsic value of the business

Buffett values businesses the way Benjamin Graham taught him: estimate the cash the business will pay out to owners over its remaining life, then discount it back to today. The mechanics are a discounted cash flow calculation. The hard part is the inputs.

The growth rate, the discount rate and the terminal value all involve judgement. Two analysts can do the same DCF on the same business and come out 30% apart. Buffett's reply is that intrinsic value is a range, not a number, and the goal is not precision but a defensible estimate. For the basic mechanics, our guide on intrinsic value walks through a worked DCF. For the broader framework, see how to value a stock in the UK.

12. Buy only at a significant discount to intrinsic value

The final tenet is the margin of safety. Buffett will not buy a business at its estimated intrinsic value, only at a meaningful discount to it. The wider the gap between price and value, the more room you have to be wrong about the inputs.

The discipline is harder than it sounds. Markets do not hand you 30%-off prices on great businesses very often. Most of the time the right answer is to do nothing. Buffett's edge is partly that he is willing to do nothing for years at a stretch, and then move in size when the price finally comes to him.

Can UK Investors Actually Apply This?

Honestly, with difficulty. The FTSE 100 is a shallower pool of Buffett-style businesses than the S&P 500. It is heavy on banks, miners, oil majors and tobacco. The genuinely Buffett-shaped names are a short list: Diageo, Unilever, RELX, Experian, LSEG, Reckitt, maybe a couple of pubs and water companies on a generous reading.

The wider FTSE 250 has more candidates but less liquidity and less analyst coverage. And running the full twelve-point analysis on each one, in your spare time, is a serious time commitment. Most retail investors who try this either end up doing it badly or quietly drift back to a global tracker.

Before you go further, write down why you are buying. Buffett does this in every Berkshire letter and recommends shareholders do the same. Our guide on how to write your investment thesis covers the format that catches the most mistakes.

The Simple Alternative: Just Buy Berkshire

If you like Buffett's framework but do not have the time, energy or stomach to apply it yourself, there is a much easier answer. Buy Berkshire Hathaway B-shares (BRK.B) inside your ISA and let Buffett (and his successors) do the work. Several UK brokers offer fractional US shares now, so you can hold even one share in a £20,000 ISA without trouble.

The honest second-best, which is what most readers will actually do, is to ignore Buffett entirely and hold a global tracker. The maths is on your side, the fees are tiny, and you will spend approximately zero hours per year worrying about owner earnings. Buffett himself has told his trustees to put his widow's money in a low-cost S&P 500 index fund. He is allowed to be inconsistent. You should pay attention.

Frequently Asked Questions

How does Warren Buffett pick stocks?

Buffett picks stocks using a four-stage filter: business tenets (is it simple and understandable, with a long history and good long-term prospects), management tenets (rational, candid, independent), financial tenets (high ROE, strong owner earnings, fat margins, retained pounds creating market value), and value tenets (intrinsic value, margin of safety). All four must pass.

What are Warren Buffett's investment principles?

The canonical list of Warren Buffett's investment principles is the twelve points distilled by Robert Hagstrom in The Warren Buffett Way. They cover business quality, management behaviour, financial discipline, and price discipline. The single underlying idea is that a wonderful business at a fair price beats a fair business at a wonderful price.

Can UK retail investors really invest like Buffett?

Mostly no, not literally. The UK market has fewer Buffett-shaped businesses than the US, retail investors do not get access to private deals or management meetings, and running the twelve-point analysis properly takes serious time. What does transfer is the discipline: understand what you own, demand quality, refuse to overpay. If you want exposure to Buffett's actual picks, buy Berkshire Hathaway B-shares in an ISA.

What does Buffett mean by "owner earnings"?

Owner earnings are reported net income plus depreciation and amortisation, minus the capital expenditure required to maintain the business's competitive position. It is Buffett's version of free cash flow and tells you how much cash the business actually generates for shareholders after keeping the lights on. Reported net income flatters businesses with high maintenance capex; owner earnings do not.

What is the "margin of safety" in Buffett's framework?

Margin of safety is the gap between a business's intrinsic value (what it is worth, based on the cash it will pay out) and its current share price. Buffett insists on a wide gap before buying, because the inputs to a valuation are always uncertain. A 30% discount to intrinsic value gives you room to be wrong and still make money.

Further Reading:

The Intelligent Investor - Benjamin Graham - The foundational text on value investing that Buffett still calls "the best book on investing ever written", and the source of the margin-of-safety concept that runs through tenets 11 and 12. (Affiliate link - we may earn a small commission at no extra cost to you.)

The Psychology of Money - Morgan Housel - The behavioural companion to Buffett's framework. Twelve principles are useless if you cannot sit on your hands for years at a time, and Housel's book is the best modern treatment of why patience matters more than cleverness. (Affiliate link - we may earn a small commission at no extra cost to you.)

Read Next:

• What Is Intrinsic Value?
• How to Value a Stock in the UK
• How to Write Your Investment Thesis
• Warren Buffett and the Interpretation of Financial Statements