I've been wanting to understand well the difference between preferred and common stocks for a while, because the truth is that many people invest without being clear about how they really differ. It turns out not all stocks issued by a company give you the same rights, and that's quite important if you want to know where you're putting your money.

Companies can mainly issue two types: common and preferred. They seem similar, but they work in very different ways. Common stocks are the most typical type, the ones you usually see in any portfolio. They give you voting rights at shareholder meetings, which means you can influence important decisions like who runs the company. You also receive dividends, but here’s the interesting part: these vary depending on how well the company is doing. If the company earns a lot, you get more; if it earns little, you get less or nothing. And if the company goes bankrupt, you are at the end of the line to recover some of your investment.

Preferred stocks work in many ways the opposite. Generally, they do not allow voting, so you lose that influence over corporate decisions. But in exchange, they offer something many investors value: more stable and predictable dividends. These are usually fixed or have a pre-established rate. Additionally, if the company runs into trouble, you have priority over common shareholders to recover your money. There are interesting variants like cumulative preferred stocks, where unpaid dividends accumulate for later payment, or convertible stocks, which can be transformed into common shares under certain conditions.

Thinking about it, the difference between preferred and common stocks is quite clear when you see it this way: preferred stocks are for those seeking regular and predictable income, while common stocks attract those looking for growth potential and willing to accept more volatility. Preferred stocks have less liquidity, meaning they are harder to sell quickly, and their capital gains potential is limited. Common stocks, on the other hand, move more actively in the market, are easier to sell, and can grow significantly if the company succeeds.

Regarding specific rights, common shareholders have that voting power I mentioned, receive variable dividends, and are lower in the hierarchy during liquidation. Preferred shareholders do not vote, receive priority dividends, and are higher in the hierarchy, though still below those who lent money to the company. From an accounting perspective, both are considered equity, but preferred stocks are sometimes treated as debt in certain analyses, especially if they have characteristics similar to bonds.

If you're interested in investing, the typical strategy is diversification. Some investors mix common and preferred stocks to balance risk and return. Young investors with a long-term horizon usually prefer common stocks because they can wait for the market to recover after downturns. Those close to retirement or seeking steady income tend to prefer preferred stocks.

The buying process is quite straightforward: find a regulated broker, open an account, carefully analyze the company you're interested in, and place your order. You can buy at the current market price or set a limit price. Some brokers also allow trading CFDs on these stocks, which gives you more options but also more complexity.

Looking at historical data, the S&P U.S. Preferred Stock Index, which represents about 71% of the preferred stock market traded in the United States, has shown very different behaviors from the S&P 500. Over a five-year period, the preferred index fell 18.05% while the S&P 500 rose 57.60%, perfectly illustrating how these two categories respond differently to changes in the economic environment and interest rates.

In summary, choosing between preferred and common stocks depends heavily on your investor profile. If you're seeking long-term growth and can tolerate volatility, common stocks are your option. If you prefer steady income flow and lower risk, preferred stocks make more sense. The key is to understand these differences well before investing, because each has its place in a well-constructed portfolio.