Stocks

Penny Stocks: What They Are, Characteristics, and Main Risks

Astron Team · 09/24/2026 · 6 min read

Stocks trading at very low prices usually spark a particular fascination: the idea of buying a large quantity of shares for little money and watching the value multiply quickly. These stocks are known as penny stocks, and although there are stories of significant gains involving this type of stock, they also concentrate some of the highest risks in the entire stock market.

This article doesn't recommend buying or selling any specific penny stock — the goal is to explain the characteristics of this type of asset and the risks anyone should consider before taking an interest in it.

What defines a penny stock

Generally, penny stocks are stocks trading at very low prices, usually from companies with small market value. Many of these companies have a short track record, limited financial history, or operate in speculative sectors, which helps explain both the low price and the elevated risk associated with these stocks.

Why they attract so much interest

• Affordable price: you can buy a large quantity of shares with relatively small capital, which creates an impression of accessibility.
• Percentage gain potential: a stock that goes from R$ 0.50 to R$ 1.00 has doubled in value, a significant percentage move that draws attention, even though the amount in money seems small.
• Publicized success stories: isolated success cases circulate widely, creating the impression that this type of gain is more common than it actually is.

The risks that usually stay hidden

The main risk with penny stocks is low liquidity: there may be few buyers and sellers willing to trade the stock at a given moment, which makes both entering and exiting the position at the desired price difficult. On very low-liquidity assets, even a moderately sized order can move the price disproportionately.

Another relevant risk is the lack of consistent public information. Smaller companies usually disclose less detailed financial data, which makes a solid fundamental analysis harder and increases reliance on rumors or unverified promises. Add to that the risk of manipulation: because of their low liquidity and reduced price, penny stocks are historically more susceptible to artificial pump schemes followed by a sharp drop, when whoever inflated the price decides to sell.

A numerical example of liquidity risk

Imagine an investor with R$ 1,000.00 buying shares of a penny stock at R$ 0.20 each, totaling 5,000 shares. If, at the time of selling, there are few buyers willing to pay that price, the investor may need to accept R$ 0.15 or less per share to quickly unload the position — a 25% loss purely from the difficulty of finding a counterparty, with no relevant change in the company's fundamentals during that stretch.

How to assess this type of asset more cautiously

1. Check the average daily trading volume before considering any trade, to understand the stock's real liquidity.
2. Be suspicious of recommendations promising certain or quick gains, especially from unverified sources.
3. Limit the position size to a small fraction of total capital, given the elevated risk involved.
4. Look for the company's financial information in official sources, even though availability is more limited than for larger companies.

Practical conclusion

Penny stocks aren't, by definition, bad opportunities, but they concentrate characteristics that demand extra caution: low liquidity, limited information, and greater exposure to price manipulation. Any decision involving this type of asset should consider the position size relative to total capital and the real ability to exit the trade when needed, not just the advertised percentage gain potential.

The difference between a low price and a cheap company

A common conceptual mistake is confusing a low stock price with a cheap company in terms of value. A stock's price alone says nothing about whether it's expensive or cheap — that depends on the relationship between the price and the company's fundamentals, like profit, revenue, and growth prospects. A R$ 0.30 stock can be overvalued relative to its fundamentals, just as a R$ 300.00 stock can be undervalued. The nominal price, alone, isn't an indicator of opportunity.

This confusion explains part of the disproportionate interest in penny stocks: the feeling of buying something cheap just because the per-share value is low, without considering how many shares exist in total or the company's real market value. Before getting interested in any low-priced stock, it's worth understanding the financial context of the company behind it, to the extent that information is available, instead of judging the opportunity purely by the number shown on screen.