Warren Buffett: 8 Mistakes Every Investor Makes

Warren Buffett: 8 Mistakes Every Investor Makes

Warren Buffett is widely recognized as the most significant investor in the world, with an illustrious career spanning nearly eight decades. His investment journey began when he was just 11 years old, and now, at 92, he has amassed a lifetime of experience and knowledge that investors can learn from.

Despite his remarkable success, Buffett has made several mistakes and witnessed many others make similar errors. As such, he’s uniquely positioned to share some essential insights into the most critical mistakes investors should avoid. In this article, we will delve into eight of these mistakes, which can help investors to avoid costly errors and make more informed investment decisions.

Mistake #1: Missed Opportunities

According to Warren Buffett, the greatest investor in the world, the most significant mistakes that investors make are not necessarily the ones that result in a financial loss. Instead, the most costly errors are often the missed opportunities – the investments investors knew enough to make but didn’t.

Buffett estimates that he has missed out on potential profits of up to $10 billion by failing to act on opportunities when he should have. These missed opportunities are the ones that haunt investors because they represent lost potential and can have a significant impact on their long-term investment returns.

While it’s challenging to identify missed opportunities, it’s essential to learn from them and avoid making the same mistakes in the future. To do so, investors must be diligent in their research and analysis, stay up-to-date with market trends and developments, and be disciplined to act on opportunities when they arise. By doing so, investors can avoid costly mistakes and achieve better long-term investment results.

Mistake #2: Selling Too Soon

Warren Buffett suggests that owning good businesses is a great investment strategy, as it allows investors to benefit from the long-term success of these businesses. For instance, if an investor owns a profitable farm, an apartment building, or a franchise, they would not sell it based on unrelated events, such as economic news or an economic slowdown. Instead, they would hold onto it long-term, as they understand that the business is valuable and has the potential for long-term success.

Similarly, Buffett advises investors who own stocks to adopt the same mentality. Owning stocks is owning pieces of businesses, and if investors own pieces of great businesses, they should not be influenced by current news events or fluctuations in the market. Instead, investors should focus on the long-term success of the businesses and not worry about short-term market fluctuations.

In other words, long-term investors should not try to time the market or make short-term gains by buying and selling stocks based on current news events. Instead, they should focus on owning great businesses for the long term and allowing their investments to grow over time. By following this investment philosophy, investors can avoid costly mistakes and achieve better long-term investment returns.

“Opportunities come infrequently. When it rains gold, put out the bucket, not the thimble.” – Warren Buffett

Mistake #3: Buying Cheap

Warren Buffett had a different approach to buying stocks in his early investing days. He would look for “cigar butts” of stocks, which were cheap but had potential. He based his decisions quantitatively, looking for companies with low price-to-earnings ratios or undervalued assets. This approach was profitable for him, but he realized it wasn’t scalable with large amounts of money.

As Buffett gained more experience, he changed his investment strategy. He now prefers to buy outstanding businesses at a fair price rather than a fair business at an excellent price. He focuses on companies with substantial competitive advantages, good management, and long-term growth prospects. He believes these types of businesses will generate higher returns over time and provide more stability to his portfolio.

Buffett’s preference for buying great businesses at fair prices reflects his belief in the importance of long-term thinking in investing. He emphasizes that investors should focus on the underlying fundamentals of the business rather than short-term market fluctuations. By investing in outstanding businesses, he believes investors can achieve greater returns and build wealth over the long term.

“It’s far better to buy a wonderful company at a fair price than a fair company at a wonderful price.” – Warren Buffett

Mistake #4: Investing in Airlines

Warren Buffett has been vocal about his mistake of investing in airlines, and it is something he advises other investors to avoid. In 1989, he bought preferred stock in U.S. Air, but the company soon had financial trouble, and his investment was in jeopardy. Buffett learned a valuable lesson from this experience and now warns others not to make the same mistake.

Buffett believes that airlines are a risky investment due to the unpredictable nature of the industry, which is heavily impacted by external factors such as fuel prices, weather conditions, labor negotiations, and global events. Instead, he advises investors to focus on buying into outstanding businesses in other sectors with a proven success track record and a solid future outlook. This way, investors can avoid the pitfalls of investing in volatile industries like airlines and ensure long-term returns on their investments.

In 2007, Warren Buffett wrote to Berkshire Hathaway investors, “If a far-sighted capitalist had been present at Kitty Hawk, he would have done his successors a huge favor by shooting Orville down.”

Mistake #5: Not Having a Strategy

Buffett believes that investors who only wait for the perfect opportunity may miss out on opportunities altogether. Instead, he advises investors to take advantage of every opportunity, even if it seems small. According to Buffett, taking small actions can ultimately lead to significant results. He believes success results from making small, consistent investments over a long period.

Buffett encourages investors to start small and build their investment portfolios over time. By consistently investing in solid businesses, investors can compound their returns over the long term. Even small amounts invested regularly can add up over time, and investors who start early and remain disciplined can accumulate wealth significantly.

Buffett’s approach emphasizes taking action and not waiting for the perfect opportunity. Investors can create a strong foundation for long-term financial success by taking action and investing regularly.

“All there is to investing is picking good stocks at good times and staying with them as long as they remain good companies.” – Warren Buffett

Mistake #6: Overtrading

Buffett warns that investors who overtrade in bull markets risk losing money in the long run. Instead of trying to make a quick profit by jumping in and out of the market, investors should adopt a more measured approach. One mental model for investing that Buffett recommends is the punch card system, which makes you think in terms of limiting the number of investment decisions an investor can make in a lifetime. This thought process gives the investor a punch card with 20 punches, each representing a decision to buy or sell stock; they must filter each investment decision through this. They must ask, “If I could only make 20 investments in my whole life, would this be one of those 20?”

The thought process is that once all 20 punches have been used, investors must stop making investment decisions and hold onto their current holdings. This mental filter encourages investors to think carefully about each investment decision and avoid the temptation of buying too many stocks and becoming too diversified. Buffett believes only taking positions in your best ideas is crucial over your lifetime. By taking a disciplined approach and sticking to a long-term investment plan, investors can increase their chances of success in the market.

“You don’t need to check your investments all the time.” – Warren Buffett

Mistake #7: Following the Crowd

Following the herd mentality during bull markets can lead to irrational investment decisions and ultimately result in losses. Buffett advises investors to remain objective and avoid being carried away by the crowd’s emotions. He suggests that investors should look for companies with a long-term outlook and strong fundamentals, which can weather market volatility and remain profitable over 30 years or more.

He will build up cash during strong bull markets and make only a few new investments. Buffett likes to hold his best investments through bear markets and use his cash to buy more stocks at lower prices in the companies he is interested in. Buffett doesn’t change his fundamental approach during bull markets; he doesn’t chase bubbles.

“Be fearful when others are greedy and greedy when others are fearful.” – Warren Buffett

Mistake #8: Not Doing Research

Investing without proper research can lead to disastrous consequences for investors. It’s crucial to analyze potential investments in detail before making any decisions. Investors should examine a company’s financial statements, including revenue, earnings, cash flow, and debt levels, to determine if it’s financially sound. They should also evaluate the industry and market trends to identify potential risks or opportunities.

For instance, investing in a declining industry, such as the print media industry, may lead to losses as it faces tough competition from digital media. On the other hand, investing in a growth industry like renewable energy may offer better returns. By doing their homework and staying informed, investors can make informed decisions more likely to lead to long-term success.

Moreover, researching potential investments also involves studying the company’s management team, its competitive advantages, and any risks associated with the business. A company with a solid and experienced management team, a sustainable competitive advantage, and a clear growth strategy may be a better investment than a company with poor management, no competitive edge, and uncertain prospects.

During an interview with CNBC, Buffett said: “Read 500 pages like this every day. That’s how knowledge works. It builds up, like compound interest. All of you can do it, but I guarantee not many of you will do it.”


By avoiding these eight common mistakes, investors can save a lot of money and become successful in the long term. They should focus on owning pieces of great businesses for the long term, think carefully about every investment decision, and detach themselves from the crowd. By following these guidelines, investors can learn from the best investor of all time, Warren Buffett.