Recently, I was researching how stock investments work and came across something that many beginners don't understand well: not all stocks are the same. Specifically, the difference between common and preferred shares is quite important if you want to invest smartly.

Most companies issue two types of shares. Common shares are the most well-known, but preferred shares have very particular characteristics that make them attractive to certain types of investors. Let me break this down because it’s really worth understanding.

With common shares, you get voting rights at shareholder meetings. This means you can influence important company decisions, such as electing directors. In return, the dividends you receive depend on the company's financial performance, so they can vary quite a bit. In case of bankruptcy, you are among the last in line to recover some of your investment. But the growth potential is much higher compared to other options.

Preferred shares work differently. Here, you do not have voting rights, but in exchange, you receive fixed dividends or dividends with a pre-established rate. This is much more predictable. Additionally, in a company liquidation, preferred shareholders have priority over common shareholders, although they still rank below creditors and bondholders. There are interesting variants: cumulative preferred shares accumulate unpaid dividends for future periods, convertible preferred shares can be transformed into common shares under certain conditions, and redeemable preferred shares can be repurchased by the company.

Now, which one to choose? It depends on your investor profile. If you seek long-term growth and can tolerate volatility, common and preferred shares offer complementary options. More aggressive investors tend to prefer common shares because they want to maximize gains. Conversely, those close to retirement or simply seeking regular income prefer preferred shares because they offer stability and predictable cash flow.

Liquidity is another factor. Common shares are generally easier to sell in main markets, while preferred shares may have restrictions and are less liquid. In terms of risk, common shares are more volatile but with higher return potential. Preferred shares are safer but with limited growth.

Looking at historical data, the contrast is notable. Over a five-year period, the S&P 500 increased about 57.60%, while the S&P U.S. Preferred Stock Index fell approximately 18.05%. This clearly illustrates how these two types of investments behave differently depending on the economic context and monetary policy.

The smart strategy is to diversify. Mix common and preferred shares in your portfolio according to your age, time horizon, and risk tolerance. Younger investors may lean more toward common shares to take advantage of growth, while conservative investors or those nearing retirement benefit more from preferred shares.

If you want to start, the process is quite straightforward: choose a regulated and trustworthy broker, open your account, clearly define your strategy based on the company you're interested in, and then execute your orders. You can place market or limit orders depending on your preference. Some brokers also offer CFDs on these shares if you don’t want to hold them directly in your portfolio.

The key is to understand that common and preferred shares serve different purposes in an investment portfolio. It’s not about one being better than the other, but about choosing the one that fits your financial goals. Review your investment periodically, stay alert to market changes, and adjust your strategy when necessary. Financial education is your best tool here.