We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

5 investment principles Warren Buffett applies

Christopher Ruane outlines five key investment lessons he applies to his own investing that he learnt from Warren Buffett’s example.

You’re reading a free article with opinions that may differ from The Twelfth Magpie’s Premium Investing Services. Become a member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn more, and get a free 'Best Buy Now' stock!.

One of the most legendary investors of all time is Warren Buffett. He is famous not just for buying companies but also picking individual stocks and shares.

As an investor I think I can learn a lot from Buffett. Here are five principles he applies when investing.

Should you buy Rolls Royce shares today?

Before you decide, please take a moment to review this report first. Despite ongoing uncertainties from US tariffs to global conflicts, Mark Rogers and his team believe many UK shares still trade at substantial discounts, offering savvy investors plenty of potential opportunities to learn about.

That’s why this could be an ideal time to secure this valuable research – Mark’s analysts have scoured the markets to reveal 5 of his favourite long-term ‘Buys’. Please, don’t make any big decisions before seeing them.

Invest in what you understand

Buffett is focussed on industries he understands, such as insurance, retail, and transportation. Instead of trying to find the largest possible return by widening his search field, Buffett only invests in shares of companies when he feels comfortable that he knows how its industry works. That doesn’t mean he doesn’t still make some bad choices, of course. But it stops him from falling into a common investing mistake, of buying shares in a company without understanding what it does in detail.

Size matters

Another interesting facet of Buffett’s investment approach that often isn’t discussed is that he tends to shun investing in shares of small companies. Many of his key holdings, such as Apple, American Express, and Bank of America, are huge listed companies.

Sometimes it is harder for a massive company to sustain growth than a smaller one. So why does Buffett focus on large companies? One explanation is that he is deploying vast sums of cash, so only large companies offer enough opportunity to meet his investment objectives. Focussing on finding just a handful of companies in which to invest can free up research time compared to looking into hundreds of different small firms.

Warren Buffett on management

As an investor, Warren Buffett certainly appreciates good management. Indeed he often publicly compliments executives whose work he appreciates. But he doesn’t buy shares purely because he likes a company management. As he pithily said, “I try to invest in businesses that are so wonderful that an idiot can run them. Because sooner or later, one will.”

In practice, what that means is that he looks for companies with a competitive advantage distinct from its top talent. For example, that could be a proprietary product as with Coca-Cola, or an entrenched business ecosystem which is hard to replicate, like American Express enjoys.

Watching for red flags

I find Buffett’s approach to risk management interesting too. Some investors weigh pros and cons, and if the potential returns seem good enough, have a high tolerance for risk. Buffett, one of the most successful investors in history, doesn’t do that. He walks away from a company even if there’s a single red flag that’s alarming enough. When Lehman Brothers wanted Buffett to invest in their failing business, he took an evening to read their publicly available financial filings and that was already enough for him to walk away from any deal.

Warren Buffett’s eggs in different baskets

Buffett also follows another form of risk management: he diversifies. While he owns some great seeming shares, Buffett is always careful to make sure his portfolio is not too dependent on any single company. That is a principle I apply in my own investment decisions too.

Christopher Ruane has no position in any shares mentioned. Bank of America is an advertising partner of The Ascent, a Motley Fool company. American Express is an advertising partner of The Ascent, a Motley Fool company. The Motley Fool UK owns shares of and has recommended Apple. The Motley Fool UK has recommended the following options: long March 2023 $120 calls on Apple and short March 2023 $130 calls on Apple. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Portrait of pensive bearded senior looking on screen of laptop sitting at table with coffee cup.
US Stock

I asked ChatGPT where the SpaceX share price will be at the end of 2026. It said…

Jon Smith decides to get another opinion on the direction of travel for the SpaceX share price, and ChatGPT is…

Read more »

Investing Articles

Are Scottish Mortgage shares an unmissable buy after the SpaceX stock crash?

Harvey Jones wonders whether investors have been given an opportunity to buy Scottish Mortgage shares at a decent price, as…

Read more »

Overjoyed exited middle aged married couple giving high five, finishing doing domestic paperwork together at home. Euphoric happy older mature spouses celebrating successful investment or purchase.
Investing Articles

By mid-2027, analysts expect the BT share price to hit…

After surging to 240p in the first half of 2026, the BT share price has slumped below 200p. Will it…

Read more »

Space satellite orbiting the earth.
Investing Articles

Down 49% and 57%, is it time to buy SpaceX and Rocket Lab for my ISA?

Space stocks have taken a huge hit in the last month or so and Edward Sheldon's wondering if it’s time…

Read more »

White female supervisor working at an oil rig
Growth Shares

Oil back at $100 is great news for this FTSE 100 stock

Jon Smith explains why the move higher for oil over the past couple of weeks can act as a benefit…

Read more »

many happy international football fans watching tv
Investing Articles

By July 2027, the JD Sports share price could go from 88p to…

The JD Sports share price has been sprinting lower for years now. What could spark a turnaround in this dirt-cheap…

Read more »

Jumbo jet preparing to take off on a runway at sunset
Investing Articles

Rolls-Royce vs SpaceX: which aerospace giant is dominating the stock market in 2026?

SpaceX may be dominating headlines for now, but is it a better long-term option than one of the UK stock…

Read more »

Young female analyst working at her desk in the office
Investing Articles

Lloyds shares seem unstoppable — but what do investors need to watch out for?

Lloyds' shares seem to be on an unstoppable march back to their former glory. But what do investors need to…

Read more »