Recently, I started thinking about something that many investors overlook: not all stocks are the same. When you begin researching stock investing, you discover that there is a difference between common and preferred shares that is much more significant than it seems at first.

Most people know about ordinary shares, but few truly understand how preferred shares work and why a company would issue both types. Let me explain how they differ and why this matters for your investment strategy.

Common shares are what you typically imagine when you think of stocks. They give you voting rights at shareholder meetings, meaning you have a say in important decisions like electing directors. The attractive side is the growth potential: if the company grows, your shares can multiply. The downside is that dividends vary based on the company's results, and during tough times, there might be no dividends at all.

Now, preferred shares operate quite differently. Usually, you don’t have voting rights, but in exchange, you get something more stable: fixed dividends or dividends with pre-established rates. This is crucial. While a common shareholder might receive variable dividends, a preferred shareholder has a sort of guarantee of predictable income. Additionally, if the company goes bankrupt, preferred shares are recovered before common shares.

There are several types of preferred shares worth knowing. Cumulative preferred shares, where unpaid dividends are carried forward. Non-cumulative shares lose those missed dividends. Convertible preferred shares can be transformed into common shares under certain conditions. There are also redeemable shares, which the company can buy back, and participating preferred shares, where dividends are linked to the company's financial results.

Regarding risks, the difference between common and preferred shares is notable. Common shares are volatile, influenced by the company's performance and market sentiment. Preferred shares are more stable because their fixed dividends make them more sensitive to interest rate changes than to market volatility. However, the capital growth potential is much lower in preferred shares.

From a liquidity perspective, common shares are usually easier to sell, especially if traded on major markets. Preferred shares have lower trading volume and may have sale restrictions or redemption clauses that complicate things.

For conservative investors seeking regular income, preferred shares are attractive. They are ideal if you're close to retirement or simply prefer to sleep peacefully knowing you'll have predictable income. For those seeking long-term growth and willing to tolerate volatility, common shares make more sense.

A smart strategy is to combine both. Diversifying your portfolio with a mix of common and preferred shares allows you to balance risk and return. This reduces your exposure to volatility while maintaining growth potential.

If you want to see this in real numbers, look at the S&P U.S. Preferred Stock Index versus the S&P 500. Over a five-year period, while the preferred index fell 18.05%, the S&P 500 rose 57.60%. This perfectly illustrates how these two types of investments behave differently when interest rate environments change.

In the end, the difference between common and preferred shares is not just academic. It’s essential for building a portfolio aligned with your financial goals and risk tolerance. Aggressive investors choose common shares. Conservative investors prefer preferred shares. And the smart ones have a mix of both.