These 3 Big Mistakes Can Make Stock Investors Lose Massive Wealth

Avoid these big mistakes to prevent losing big amounts of your investment portfolio.

Typically, holding 15-20 stocks should be enough to diversify your stock portfolio. When building your stock portfolio, avoid these big mistakes to ensure your retirement fund won’t get a non-recoverable hit.

Buy stocks in the same industry

Stocks in the same industry are likely to move in tandem. For example, lower energy demand, leading to higher supply and lower prices have led to energy stocks doing poorly.

Even blue-chip dividend stocks like energy infrastructure stock Enbridge have been depressed. You can imagine the sad state most oil and gas producers are in.

Long-term stock performance depends on the business performance of the underlying company. Businesses in the same industry tend to be faced with similar challenges. They would therefore likely sell off at the same time and appreciate at the same time.

So, aim to buy the best-of-breed company in an industry with bright prospects instead of buying multiple stocks in the same industry when they look cheap *ahem* energy stocks.

Hold too much of the same sector

I was taken aback the first time I heard a retail investor holding 50% of their portfolio across the Big Five Canadian banks on BNN. I suppose an investor can do much worse than holding RBC, TD, BNS, BMO, and CIBC for a long time because in most years, the banks have returns on equity in the teens thanks to the favourable regulatory environment in Canada. However, having that much in the Canadian banks is going overboard.

Why not buy and hold only the top Canadian bank stocks for greater returns?

As a general rule, it’s best not to hold more than 25% in the same sector. This way, if something happens to a sector, your diversified portfolio as a whole will still be more or less intact.

Buy only dividend stocks 

I started my investing journey by buying dividend stocks because I felt that even in a down year, I would still get some returns from the periodic dividends.

Dividends aren’t guaranteed, though. Other than the ones declared, companies can cut their dividends anytime.

Dividend cuts are particularly prominent in stocks that have volatile earnings, slow or negative growth, or high payout ratios.

So, when choosing stocks for your diversified portfolio, don’t just look for nice dividends. Seeking total returns is better, especially if you are early on in your investing journey. (But be aware of the downside risk as well.)

A dividend stock portfolio with a nice yield of 3% can deliver total returns of about 10%. A portfolio that achieves a total return of 12-15% per year will turn monthly contributions of $500 into $702,931-$1,099,007 in 23 years. The same contributions to the dividend portfolio will only arrive at $524,984 in the period.

Oftentimes, mature companies pay nice, safe dividends. But there are many more great businesses out there that pay no to low dividend yields. Don’t count these companies out!

The Foolish takeaway

There are different facets to diversification. Ensure your portfolio is diversified across industries with bright prospects, income, and growth.

Match your investment choices against your financial goals.

If you’re a long way off from retirement, you might focus more on growth. If you’re close to or at retirement, you’d want to weigh more on income safety.

Fool contributor Kay Ng owns shares of Enbridge, Royal Bank of Canada, The Bank of Nova Scotia, and The Toronto-Dominion Bank. The Motley Fool owns shares of and recommends Enbridge. The Motley Fool recommends BANK OF NOVA SCOTIA.

More on Dividend Stocks

dividends can compound over time
Dividend Stocks

3 Ultra-High-Yield Dividend Stocks I’m Still Buying

These three ultra-high yields look tempting, but each one pays you in a very different (and with a very different…

Read more »

Aerial view of a wind farm
Dividend Stocks

Maximum TFSA Impact: 2 TSX Stocks to Help Multiply Your Wealth

Want to get more out of your TFSA? These two TSX stocks could help you grow wealth steadily over time.

Read more »

Canada day banner background design of flag
Dividend Stocks

The Very Best Canadian Stocks to Hold Forever in a TFSA

The best Canadian stocks to hold forever in a TFSA, and why CNR, BCE, and GRT.UN offer long‑term stability, income,…

Read more »

House models and one with REIT real estate investment trust.
Dividend Stocks

It’s Time to Buy: 1 Oversold TSX Stock Poised for a Comeback

Here's why this oversold TSX stock, offering a dividend yield above 4%, might just be the best long-term investment you…

Read more »

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 »

middle-aged couple work together on laptop
Dividend Stocks

How to Make Money in a TFSA With Dividend Stocks

Dividend stocks can deliver income as well as capital gains for patient TFSA investors.

Read more »

TFSA (Tax free savings account) acronym on wooden cubes on the background of stacks of coins
Dividend Stocks

A TFSA Pick Yielding 6.9% With Dependable Cash Payments

Unlock the potential of your TFSA by understanding its investment opportunities and tax benefits for Canadians.

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 »