If you're thinking about investing in the stock market, you've probably heard about common and preferred shares, but do you really know how they differ? It turns out not all shares give you the same rights within a company, and that's an important thing you should understand before putting your money in.

Basically, companies issue two main types of shares. On one side are common shares, which are the most typical and the ones most people know. On the other side are preferred shares, which operate quite differently. The difference is more significant than it seems, both for the companies and for us investors.

Common shares allow you to vote at shareholder meetings, meaning you have some voice in the company's important decisions. In return, your dividends can vary quite a bit depending on how well the company performs. If the company goes bankrupt, you're among the last in line to recover your investment. But here’s the interesting part: you have a lot of growth potential if the company takes off.

Preferred shares work differently. They generally do not allow you to vote, but in exchange, you receive much more stable and predictable dividends. It's like having a more secure income stream. In case of problems, you have priority over common shareholders to recover your money. They are perfect if you're looking for regular income without much volatility.

Within preferred shares, there are several variants. There are cumulative ones, where unpaid dividends accumulate for later payment. Convertible ones, which you can transform into common shares under certain conditions. Also redeemable ones, which the company can buy back. Each has its own rules of the game.

What’s fascinating is that preferred shares are a middle ground between debt and equity. Technically, they are considered equity on the company's books, but they behave more like a fixed-income instrument. Dividends are usually fixed or have a pre-established rate, but unlike bonds, the company is not legally obligated to return the invested capital.

Regarding risks, common shares are much more volatile. The price rises and falls depending on how the market and the company's performance go. Dividends can be high or nonexistent. It’s risky, but the profit potential is much greater. Preferred shares, on the other hand, are more predictable but with less opportunity for explosive growth. They are sensitive to interest rate changes, so when rates go up, the value of these shares tends to decrease.

To buy common and preferred shares, the process is quite similar. You need to choose a regulated and trustworthy broker, open an account, carefully analyze the company you want to invest in, and execute your order. Some brokers also allow you to trade CFDs on these shares if you prefer not to hold them directly in your portfolio.

Now, which is better for you? It depends entirely on your profile. If you're young, risk-tolerant, and have a long-term investment horizon, common shares are probably more attractive. You can withstand fluctuations and wait for them to grow over time. If you're close to retirement or simply looking for stable income without unpleasant surprises, preferred shares make a lot of sense.

An intelligent strategy is to diversify. Mix both types in your portfolio to balance risk and return. This way, you reduce exposure to volatility but keep growth opportunities.

Looking at the real market, the S&P U.S. Preferred Stock Index accounts for approximately 71% of the preferred stock market in the United States. It’s interesting to note that in the recent five-year period, this index fell by 18.05%, while the S&P 500 rose by 57.60%. That difference perfectly illustrates how these two types of investments behave differently, especially when monetary policy changes. Common and preferred shares respond in completely different ways to economic shifts.

The important thing is that you understand what you're buying. Common shares offer more opportunity but more risk. Preferred shares offer more security but less growth. There’s no one-size-fits-all answer, only what works for your personal situation and financial goals.