Penny Stocks: The Risks, The Mechanics, and What Actually Happens

Penny stocks offer large percentage moves and a market structure designed to transfer money from late buyers to early sellers. Both facts are structural.

5 min readIntermediateUpdated September 16, 2026

At a glance

Definition
Very low priced shares, often traded over the counter
Main attraction
Large percentage moves on small capital
Main structural problem
Dilution: companies issue shares into demand
Costs
Spreads frequently 2 to 10 percent round trip
Honest summary
Playable as a short-term momentum game, terrible as investments

Key takeaways

  • Most penny stock companies fund operations by issuing shares, so buying demand is met with new supply and the share count grows relentlessly.
  • Spreads and slippage are so wide that a strategy needing a 3 percent edge can be unprofitable purely through execution costs.
  • Promotional campaigns exist specifically to create exit liquidity for existing holders, and they are legal in more forms than most traders realise.
  • Halts and restrictions can trap positions for days, and short selling is often unavailable or prohibitively expensive.
  • If traded at all, treat penny stocks as very short-term momentum vehicles with hard risk limits, never as investments or as swing holds.

Why the structure works against buyers

  • Dilution is the business model. Many of these companies have little revenue and fund themselves by issuing shares. Rising demand is met with new supply, which caps the price and permanently reduces each existing share’s claim.
  • Toxic financing. Convertible notes that convert at a discount to the market price create structurally motivated sellers who profit as the price falls, a dynamic sometimes called a death spiral.
  • Reverse splits reset the chart. A company that has fallen 99 percent can perform a reverse split and look like it is trading at a normal price again, hiding the history from casual chart analysis.
  • Limited disclosure. Over-the-counter tiers have far lighter reporting requirements, so the financial information available may be outdated, incomplete, or absent.
  • Concentrated ownership. Insiders and early investors often hold the majority of shares and their selling can overwhelm the available demand.
  • Promotion. Paid campaigns generate interest precisely when insiders want to sell. Disclosures exist but are typically small print at the end of an enthusiastic piece.

The cost arithmetic

Stock quoted 0.42 bid / 0.45 ask
  Spread            = 0.03 on a 0.435 midpoint = 6.9%
  Round trip cost   = roughly 6.9% before any slippage

To break even you need a 7% move in your favour.
To make 1R with a 10% stop you need roughly a 17% move.

Add: partial fills, price impact on exit when volume dries up,
and the fact that the bid can disappear entirely during a decline.
Why the edge required is so much larger than it looks.

This is the quiet reason most penny stock strategies fail even when the entries are good. The percentage moves are large, but so are the costs, and the costs are paid on every trade while the large moves occur only sometimes.

If you trade them anyway

  1. 1

    Trade only exchange-listed names with real volume

    Require a listing on a major exchange rather than an over-the-counter tier, and a minimum of several million shares of genuine daily volume. This eliminates the worst of the disclosure and liquidity problems.

  2. 2

    Treat them as intraday instruments

    Overnight holds expose you to dilution announcements, offerings priced below market, and halts. Most of the structural risk is concentrated in the overnight period.

  3. 3

    Size in dollars, not in shares

    A thousand shares of a 0.40 stock feels small and can still be an oversized position relative to the available exit liquidity. Never take a position larger than a small fraction of the average minute volume.

  4. 4

    Check the share count and financing history

    Shares outstanding over time is the single most informative data point. A share count that has multiplied repeatedly is the signature of a serial diluter.

  5. 5

    Use hard stops and accept slippage

    The bid can vanish during a decline. Stops will fill badly, which is a reason to keep position sizes small rather than a reason to skip stops.

  6. 6

    Assume promotion until proven otherwise

    Look for the disclosure at the end of any promotional material. Paid campaigns are legal when disclosed, and the disclosure tells you who is selling.

Better ways to get the same exposure

The appeal of penny stocks is usually volatility: the possibility of a large percentage move on small capital. That exposure is available elsewhere with far better structure.

WantBetter instrumentWhy
Large percentage movesSmall-cap growth ETFs or liquid high-beta stocksReal liquidity, real disclosure, no dilution spiral
Leverage on small capitalMicro futures or defined-risk optionsTransparent pricing, deep liquidity, capped risk
Speculative upsideLong call options on liquid namesLoss capped at premium; no promotion risk
Momentum tradingLiquid mid-cap movers with catalystsSame setups, one tenth of the spread
Early-stage exposureVenture or growth fundsDiversified, professionally screened

Frequently asked questions

Can you make money trading penny stocks?

Some very short-term momentum traders do, by trading listed names with high volume, holding for minutes, and managing risk tightly. What almost never works is buying and holding them, because dilution and the absence of underlying economics mean time works against the position. The category is a trading vehicle at best and never an investment.

What is a pump and dump?

A scheme in which promoters accumulate shares, generate enthusiasm through coordinated messaging, sell into the resulting demand, and leave later buyers holding a position with no support. It is illegal when it involves false statements, and versions using only selective enthusiasm and disclosed paid promotion operate in a legal grey area.

Why do penny stocks keep falling over time?

Primarily dilution. Companies without cash flow fund themselves by issuing shares, so the share count rises continuously while the business value does not. Each existing share represents a smaller claim, which mathematically pushes the price down regardless of sentiment.

Can I short penny stocks?

Often not. Shares are frequently unavailable to borrow, and where they are, borrow fees can exceed 100 percent annualised. Squeezes in low-float names can be extreme, with prices multiplying in hours. The structural case against these companies is usually correct and extremely difficult to express profitably.

What is a low float stock?

One with a small number of shares available for public trading, often because insiders hold the majority. Small floats amplify price moves because modest buying pressure meets limited supply. They are also the names most prone to violent reversals and to sudden dilution when the company issues new shares into the strength.

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Referenced by

Educational use only. This guide explains how a strategy works. It is not investment advice, not a recommendation, and no result described here is a forecast. Test any approach on historical and out-of-sample data, size positions conservatively, and never risk money you cannot afford to lose.