Liquidity

OTC market

OTC market is a decentralized market where securities trade through broker-dealer networks rather than on a centralized stock exchange.

What it means

An over-the-counter (OTC) trade takes place through broker-dealers rather than on a centralized stock exchange. For stocks, dealers may quote prices at which they are willing to buy or sell. OTC describes where and how a security trades; it does not, by itself, describe the company’s size, quality or risk.

OTC securities vary widely. Some have frequent trading and competing quotes; others trade infrequently. Available information, quote quality and broker access can also differ. A displayed quote is not a promise that a particular order size will receive that price.

How it is calculated

The OTC market itself is not calculated. One useful measure for checking a quoted OTC stock is its bid-ask spread: the difference between the lowest quoted ask available to you and the highest quoted bid available to you at a particular time.

Quoted spread (US$ per share) = ask price − bid price

  • Ask price: The quoted price to purchase one share, in US$ per share.
  • Bid price: The quoted price to sell one share, in US$ per share.
  • Quoted spread: The difference, in US$ per share. To express it as a percentage, divide the spread by the midpoint—(bid + ask) / 2—and multiply by 100.

This calculation uses quotes, not executed prices. Quotes can change or cover fewer shares than the intended order. Commissions, price movement during execution and market impact are separate potential costs.

Worked example

Suppose a hypothetical OTC stock shows a bid of US$9.90 for 200 shares and an ask of US$10.10 for 100 shares. An investor is considering a purchase of 100 shares.

  1. Subtract the bid from the ask: US$10.10 − US$9.90 = US$0.20 per share.
  2. Find the midpoint: (US$9.90 + US$10.10) / 2 = US$10.00 per share.
  3. Express the quoted spread relative to the midpoint: US$0.20 / US$10.00 × 100 = 2%.
  4. If all 100 shares fill at the displayed ask, the purchase costs 100 × US$10.10 = US$1,010, before any commission. That is US$10 above the 100-share midpoint value of US$1,000.

The US$10 difference is a comparison with the quoted midpoint, not a guaranteed trading cost or a forecast of resale proceeds. An order larger than the displayed 100-share ask might receive other prices, a partial fill or no fill.

Why it matters before you trade

For an OTC stock, check both the price and the number of shares available at that price. A wide spread, limited quoted size or infrequent trading can make the eventual execution price uncertain. A recent transaction price may not represent a price currently available for your order.

Check the security’s trading status, available company disclosures and whether your broker supports it. Consider how the proposed order size compares with typical trading volume and whether its execution conditions allow partial fills or set a price limit. A limit price controls the worst acceptable purchase price or lowest acceptable sale price, but it does not guarantee execution.

How PreTrAIde uses it

PreTrAIde’s stated stock coverage is US stocks and major European exchanges; its product facts do not establish OTC-market coverage or an OTC-specific calculation. Do not assume an OTC security is supported.

Where a stock is supported, PreTrAIde’s pre-trade analysis checks a proposed basket before the user places an order. Its quantitative layer estimates bid-ask spread, participation in daily volume, market impact and liquidity, among other measures. It returns a GO, NO-GO or MODIFY verdict with reasoning as decision support—not a recommendation or an execution quote. PreTrAIde does not place orders; users trade through their own brokers.

Common mistakes

  • Treating OTC as synonymous with penny stocks: OTC trading includes securities with different prices and characteristics.
  • Treating a quote as a firm fill for any size: The displayed quantity and price may change before execution.
  • Assuming the spread is the entire cost: Commissions and execution away from the displayed quote can also matter.
  • Using an old last-trade price as a current offer: It records a past transaction, not necessarily an executable price now.
  • Assuming exchange-style liquidity: Trading activity and available quotes depend on the particular security.

Frequently asked questions

Is the OTC market a stock exchange?

No. OTC trading occurs through broker-dealers rather than on a centralized stock exchange.

How do I calculate an OTC stock’s bid-ask spread?

Subtract the quoted bid from the quoted ask. For example, a hypothetical US$9.90 bid and US$10.10 ask give a US$0.20-per-share quoted spread; the actual fill may differ.

Does PreTrAIde analyze OTC stocks?

PreTrAIde’s stated coverage is US stocks and major European exchanges. Its product facts do not establish OTC-market coverage, so support for an OTC security should not be assumed.

Related terms

Liquidity Liquidity is the ability to buy or sell an asset promptly in the desired quantity without substantially moving its price or incurring excessive trading costs. Bid-ask spread Bid-ask spread is the difference between the lowest displayed price to sell a stock (ask) and the highest displayed price to buy it (bid), measured per share. Market maker Market maker is a firm that regularly quotes prices to buy and sell a security, supplying liquidity while managing the risk of holding inventory. Market depth Market depth is the quantity of buy and sell orders available at different prices in an order book at a particular moment. Illiquid stock Illiquid stock is a stock that may be difficult to trade in the desired quantity or timeframe without a substantial spread, price impact, or delay. Limit order Limit order is an instruction to trade at a specified price or better: a buy cannot execute above its limit, and a sell cannot execute below its limit.

Liquidity

Average daily volume (ADV) Dollar volume Turnover Free float Liquidity risk Days to liquidate Amihud illiquidity ratio Liquidity tier All glossary terms →

Check your next trade before you place it

Build a basket, run a pre-trade analysis, and get a GO, NO-GO or MODIFY verdict with the cost, liquidity and risk behind it.

Start your free trial Try the free tools

Educational content, not investment advice. PreTrAIde is analysis software, not a broker: it never executes orders, and its verdicts are decision support, not recommendations to buy or sell.