What is a penny stock? The SEC definition
In everyday use, and on most stock screeners, a penny stock is any share trading below $5. That line comes from the SEC’s rule defining a penny stock (Rule 3a51-1 under the Securities Exchange Act), which excludes shares priced at $5 or more. The legal definition is narrower than the everyday one: it also excludes most stocks listed on national exchanges that meet their listing standards. So a $3 stock on Nasdaq may not be a penny stock in law, but it is one in conversation.
Penny stocks overlap heavily with microcap stocks. The SEC’s investor site describes companies with a market capitalization of less than $250 or $300 million as microcaps, “sometimes referred to as penny stock”, and those under $50 million as nanocaps. The SEC’s guide to microcap stocks calls them among the most risky investments: many of the companies are new, with no proven track record.
- Penny stock
- In common use, a share trading below $5. The SEC’s legal definition also excludes most stocks listed on national exchanges, so it applies mainly to low-priced shares traded over the counter.
- Microcap stock
- A stock of a company with a small market capitalization, often described by the SEC as less than $250 or $300 million; below about $50 million, a nanocap.
Where do penny stocks trade? OTC markets vs exchanges
Many penny stocks are not listed on an exchange at all. They trade over the counter (OTC), quoted by dealers on electronic interdealer quotation systems. Exchanges such as the NYSE and Nasdaq set listing standards that a company must keep meeting, including a minimum share price, a minimum number of shareholders and corporate governance rules. OTC securities face far fewer requirements, and the SEC notes that information about microcap companies can be extremely difficult to find.
Some low-priced shares do trade on Nasdaq or the NYSE, usually after a long fall from higher prices. Being listed is not a quality stamp, but it does bring listing rules and the threat of delisting, covered below. NYSE vs Nasdaq explains how the two exchanges differ.
- Over-the-counter (OTC) market
- Trading in securities that are not listed on an exchange, quoted by dealers on electronic networks. Listing rules are lighter and company information is often thinner.
Why a low share price is not cheap: price vs market cap
Hypothetical example: company A trades at $0.80 and has 500 million shares; company B trades at $80 and has 5 million shares. Multiply price by shares and both have a market cap of $400 million. They are the same size. The pizzas at the top of the page are the same pizza cut into different numbers of slices.
Spend $1,000 on each and you get 1,250 shares of A or 12.5 shares of B. Both are 0.00025% of the company. For A to double to $1.60, the market must value it at $800 million, exactly as for B to double to $160. A share price under $1 does not give a stock more room to run. What matters is whether the business can grow into a larger value, and many penny stock companies lose money every year. If what attracts you is the growth of small companies, a broad fund that holds hundreds of them spreads that risk; see index fund investing.
Dilution and reverse splits: how share counts work against you
Small companies that lose money often pay their bills by selling new shares, and every new share shrinks your slice. Hypothetical example: XYZ has 100 million shares at $0.80, so its market cap is $80 million. It sells 50 million new shares, and the cash raised goes to cover losses. If the business is worth the same $80 million afterwards, each of the 150 million shares is worth about $0.53, a third less. An owner of 10,000 shares held 0.010% of the company; now it is about 0.0067%.
Warrants and convertible notes, which turn into new shares later, can keep the dilution going. When the price falls below $1, the company may do a reverse split. In a 1-for-10 reverse split, every 10 shares become 1: XYZ goes to 15 million shares at about $5.33, and the owner now has 1,000 shares. The value does not change, but a stock that needed a reverse split has usually been falling for a long time, and more share sales often follow. Stock split explains splits in both directions.
- Dilution
- The fall in each existing shareholder’s percentage of a company when it issues new shares, for example to raise cash or when warrants and convertible notes turn into shares.
Wide spreads and thin volume: the hidden cost of penny stocks
Penny stocks often trade in small amounts, with few buyers and sellers at each price. Hypothetical example: XYZ is quoted at $0.80 bid and $0.84 ask, a 4-cent spread, about 4.9% of the $0.82 midpoint. If you buy $1,000 at the ask, you get 1,190 shares for $999.60. Sell them a second later at the bid and you get $952.00: $47.60, or 4.76%, gone before the price has moved at all.
A large, liquid stock quoted at $80.00 by $80.02 has a spread of about 0.025%; the same round trip on 12 shares costs $0.24. Thin volume adds a second problem: a market order can fill at several worse prices, and when bad news hits, there may be no buyers near the last price. Learn to read both before you trade: the bid ask spread and how to read volume.
Penny stocks and pump-and-dump schemes
Low prices, thin trading and scarce information make small stocks easy to push around. The SEC’s microcap guide notes that in such stocks any size of trade can have a large percentage impact on the price. That is the raw material of a pump and dump: promoters buy cheaply, hype the stock in chat groups and on social media, and sell into the buying they create.
The SEC warned in February 2026 that this is not limited to tiny OTC names: it has suspended trading in small exchange-listed companies whose shares were pushed to investors through social media. A sudden flood of messages about a ticker you had never heard of is a reason to step back, not to buy.
Delisting: Nasdaq’s $1 minimum bid price rule
Nasdaq requires listed shares to keep a closing bid of at least $1. If a stock closes below $1 for 30 consecutive business days, it is out of compliance, and the company usually gets 180 calendar days to close at $1 or more for at least 10 consecutive business days. Companies on the Nasdaq Capital Market may get a second 180 days. Under a change the SEC approved in December 2025, a closing bid of $0.10 or less for ten consecutive business days leads straight to a delisting determination and a trading suspension, with no compliance period.
This is why so many penny stocks show reverse splits in their history: a 1-for-10 split lifts a $0.40 stock to $4.00 on paper. Nasdaq’s rules also cut the grace period short for companies that have done large reverse splits in the previous two years. A delisted stock usually ends up quoted over the counter, where it is even harder to trade.
Penny stocks to buy now? Why we publish no list, and what to check instead
Lists of “penny stocks to buy now” and the hottest tickers on Reddit are where many beginners start. We do not publish such lists. They go stale within days, some are paid promotions, and a ticker being popular tells you nothing about the business. If you look at a penny stock at all, check these points first:
- Where does it trade: on a major exchange, or over the counter?
- Read the latest filings: revenue, cash, how fast cash is being spent, and whether the auditor warns about the company’s ability to continue.
- Compare the share count with two years ago, and look for reverse splits. A rising count means dilution.
- Look for warrants and convertible notes that can become new shares.
- Check the spread and the average daily volume: could you sell at a fair price on a bad day?
- Ask who is promoting it and whether they are paid.
- Size the position so that losing all of it would not hurt your plans. A penny stock can go to zero.