Warren Buffett’s #1 Rule and How to Apply it to Stock Investing

Warren Buffett’s number one rule to investing is never lose money. How do you go about doing it?

Warren Buffett is one of the best investors ever. Through Berkshire Hathaway, the brilliant investor compounded returns at 20% annually from 1965 to 2020, which almost doubled the S&P 500’s compounded annual growth rate of 10.2% in the period.

Persistently investing in either would have led to a nice retirement. However, for a monthly investment of $500 compounded annually, the Berkshire investment would have turned into $815 million compared with the S&P 500 investment of almost $13.5 million. That’s a humongous difference of more than $801 million!

Every percentage of return you can juice translates to more money in your pocket. Isn’t high return high risk, though? Warren Buffett’s number one rule to investing should shed some light.

close-up photo of investor Warren Buffett

Image source: The Motley Fool

Warren Buffett’s number one rule to investing: Never lose money

Even the best investors like Warren Buffett lost money sometimes. So, what does Mr. Buffett mean to never lose money? Here are two ways to interpret it.

First, preserve your capital. When an investment is turning south and obviously not working out, it may be the best move to cut losses. Then redeploy the capital in other promising investments.

When analyzing stocks, analysts or investors are in one way or another forecasting what could happen to the businesses. We buy stocks for the businesses that we anticipate will have a bright future. However, of course, no one has a crystal ball. So, we can only make the best estimate based on the information that we have at present.

Second, focus on your overall returns. We cannot be sure that every investment decision we make will be correct. However, we can aim to improve our odds. In essence, you never lose money when your overall returns are positive, even if you’ll have losses here and there.

How to do way better than never losing money

You need to have a goal in mind to achieve it. Otherwise, you wouldn’t know what to aim for. What is a long-term rate of return that satisfies you? Berkshire is a much bigger company now. Additionally, when it was small, it would invest in small-cap companies that would make a big impact on returns. Going forward, it’s unlikely for it to generate an annual return of 20%.

The long-term market returns are about 10%. If you’re aiming for market returns, you could just buy a market-wide index like the S&P 500. Alternatively, you could target a higher rate of return. Whatever the percentage may be, write it down where you can see it. Make sure it’s reasonable and attainable.

Additionally, the S&P 500 only yields 1.3% right now. Income investors are probably dissatisfied with such a small yield. That’s why some income investors invest in the S&P 500 for the purpose of diversification but also invest in a group of dividend stocks for more income.

Don’t put all your eggs in one basket

No matter how attractive an investment may be, don’t put all your eggs in one basket. Diversify! Especially during market corrections, you should have a list of best stock ideas. Buy quality businesses from different industries and sectors. In many cases, stocks from different industries go on sale at different times anyway. So, it’s a great idea to put a diversified group of wonderful stocks on your watch list. Remember to update your buy price target ranges annually.

The Motley Fool recommends Berkshire Hathaway (B shares). Fool contributor Kay Ng has no position in any of the stocks mentioned.

More on Stocks for Beginners

Concept of rent, search, purchase real estate, REIT
Dividend Stocks

This 10.4% Dividend Stock Pays Cash Every Single Month

Timbercreek’s 10%+ monthly yield is being supported by a growing mortgage book, even as it cleans up older problem assets.

Read more »

runner checks her biodata on smartwatch
Dividend Stocks

A 4% Dividend Stock That’s Quietly Becoming a Top Pick for 2026

Sun Life offers a 4%+ dividend backed by strong earnings, making it a quieter 2026 income pick.

Read more »

builder frames a house with lumber
Dividend Stocks

2 Canadian Stocks Built to Be TFSA Cornerstones Through a Volatile Market

A TFSA cornerstone should be something you can hold for years because the business keeps earning through good markets and…

Read more »

delivery truck leaves shipping port terminal
Stocks for Beginners

2 Canadian Stocks Built to Win as Global Supply Chains Break Down

Suddenly, the boring “must-have” companies tied to automation and heavy equipment are looking like market winners.

Read more »

man in business suit pulls a piece out of wobbly wooden tower
Stocks for Beginners

2 Canadian Stocks Built to Surprise During Trade Turbulence

Trade turbulence can create opportunities when investors panic-sell businesses linked to trade.

Read more »

golden sunset in crude oil refinery with pipeline system
Dividend Stocks

3 Canadian Stocks Tied to the Real Economy (Not Hype)

These “real economy” stocks are driven by backlog, contracted projects, and production volumes.

Read more »

some REITs give investors exposure to commercial real estate
Dividend Stocks

5 Cheap Canadian Stocks to Buy Before the Market Notices

The best “cheap” TSX stocks usually have improving cash flow and a clear catalyst that can flip investor sentiment.

Read more »

Tractor spraying a field of wheat
Dividend Stocks

3 TSX Stocks Built to Earn, Pay, and Endure

The safest bets are often Canada’s cash-generating “engine” companies tied to energy and global demand.

Read more »