How I’ve broken Warren Buffett’s number one investing rule

Edward Sheldon looks at Warren Buffett’s number one investing rule, and explains how he’s broken it over the years.

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.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

It’s often quoted that Warren Buffett’s number one investing rule is “never lose money“.

In fact, the legendary investor places so much emphasis on this rule that his second key investing rule is “never forget rule number one”.

Given that if you lose 20% on an investment you need to generate a 25% return to break-even, preservation of capital is paramount. However when it comes to investing in the share market, there’s no doubt it’s easier said than done.

In 15 years of investing I’ve had my fair share of losses and today I look at some of the mistakes I’ve made over the years which have resulted in a loss of capital.

I tried to get rich fast

In my early investing days I invested way too much capital in highly speculative stocks in an attempt to get rich fast. Many of these companies had no revenues, earnings or dividends, yet I was convinced that I might be able to land a 100 bagger’ and achieve instant wealth. 

Needless to say, I learned the hard way, as many of these speculative companies went bust. In hindsight it was not wise to invest so much in the small end of the market.  

I’ve since changed my investing approach and these days I’m focused on building a sizeable portfolio over the long term, mainly through investing in high-quality, dividend-paying companies and putting the power of compounding to work. 

While I still allocate a small portion of my portfolio to smaller companies, I look for ones that are already generating revenues and earnings, as I’ve found that there’s less chance of these companies bombing.  

I didn’t diversify properly

Diversification is one of the fundamental elements of investing, yet it’s surprisingly easy to get wrong.

I recall getting carried away with mining stocks during the mining boom, and stuffing my portfolio to the brim with a selection of highly speculative mining companies. With the mining sector firing on all cylinders, I focused heavily on this one sector and neglected the rest of the market.

I thought I was diversified because I was invested across 15 different stocks, however, when the mining boom ended, the whole sector crumbled, and my portfolio suffered heavily.

The lesson I learned is that diversification is about more than just buying a handful of stocks — it’s important to diversify across asset classes, countries, sectors, companies and market capitalisations, too

I got greedy

Have you ever owned a stock that rose exponentially in a short period of time?

A few years ago, I purchased a stock that gained around 600% in under a year. I had taken some profits off the table when the stock first doubled, but then as the stock kept rising, and euphoria surrounding the stock increased, I became greedy and ploughed more capital into the stock. This one company made up an unhealthy proportion of my portfolio.

When profits at the company failed to materialise, sentiment changed quickly and the stock fell heavily, taking a chunk of my capital with it.

Fear and greed are the dominant emotions in the investing world, and it’s vital to keep these emotions in check. 

Edward Sheldon has no position in any shares mentioned. The Motley Fool UK has no position in any shares mentioned. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Investing Articles

£10,000 buys 373 shares in this FTSE 100 heavyweight that’s tipped to surve in 2026

With analysts expecting the stock to climb 54% in the next 12 months, is now the perfect time for investors…

Read more »

This way, That way, The other way - pointing in different directions
Investing Articles

Are BP shares a slam-dunk buy as oil prices rocket – or is there a hidden danger?

As the oil price rises, investors might expect BP shares to follow. But Harvey Jones warns it may not play…

Read more »

Investing Articles

2 growth stocks to consider buying for an ISA in March

Here are two growth stocks I think are worth considering buying. Both have stumbled recently, even though the underlying businesses…

Read more »

Close-up of a woman holding modern polymer ten, twenty and fifty pound notes.
Investing Articles

How long might a Stocks and Shares ISA take to earn a £950 monthly second income?

Christopher Ruane explains how someone could seek to turn a Stocks and Shares ISA into a source of monthly passive…

Read more »

British pound data
Investing Articles

Get yourself ready for a violent stock market crash!

The FTSE 100 is sinking, raising fears of a fresh stock market crash. What are you doing about it? Here's…

Read more »

ISA Individual Savings Account
Investing Articles

Hands up, who’s dreaming of a million in a Stocks and Shares ISA?

How to make a million in a Stocks and Shares ISA, that's what headlines keep banging on about. Let's look…

Read more »

British Pennies on a Pound Note
Investing Articles

OK, who’s dreaming of making a million from red-hot penny shares?

Investors in penny shares can sound like the most upbeat optimists there are. It can work, but hopes need to…

Read more »

Three generation family are playing football together in a field. There are two boys, their father and their grandfather.
Investing Articles

Could this ultra-high-yielding FTSE 100 passive income gem quietly fund my retirement?

With rising payouts, strong cash generation and impressive earnings forecasts, this FTSE 100 dividend gem may be developing into a…

Read more »