Liquidity

Turnover

Turnover is the number of shares traded over a period, or that trading volume expressed as a percentage of shares outstanding or free float.

What it means

A stock's turnover describes trading activity during a stated period, such as one trading day. The word has two common meanings: share turnover is the number of shares traded, while a turnover ratio compares that number with a share count. Always check which meaning a data source uses.

The denominator for a turnover ratio may be total shares outstanding or free float—the shares available for public trading. These produce different percentages, especially when a large portion of a company's shares is closely held. Dollar turnover is different again: it is the value of shares traded, measured in currency rather than shares or percent. Turnover here refers to trading in one stock, not portfolio turnover, which measures changes in portfolio holdings.

How it is calculated

For a single day, share turnover is daily trading volume. For a ratio, choose a period and use a denominator measured on a consistent basis:

Turnover ratio (%) = (shares traded during period / shares outstanding or free-float shares) × 100

  • Shares traded during period: reported trading volume over the chosen day, week or other period, in shares. Add daily volumes if calculating a multi-day total.
  • Shares outstanding: all issued shares currently held by investors, in shares.
  • Free-float shares: the subset generally available for public trading, in shares. State whether this or shares outstanding is the denominator.

The numerator and denominator both use shares, so the ratio is a percentage. Dollar turnover can be approximated as shares traded × volume-weighted average price, giving a currency amount for the same period. A quoted turnover rate may instead be an average daily ratio; it should not be confused with a multi-day total.

Worked example

Assume a hypothetical US stock trades 200,000 shares in one day. It has 10 million shares outstanding, including 8 million free-float shares. Suppose its volume-weighted average price that day is US$50.

  1. Share turnover is 200,000 shares for the day.
  2. Turnover relative to shares outstanding is 200,000 / 10,000,000 × 100 = 2% for that day.
  3. Free-float turnover is 200,000 / 8,000,000 × 100 = 2.5% for that day.
  4. Dollar turnover is 200,000 × US$50 = US$10 million for that day.

These figures describe the same hypothetical trading day, but answer different questions. The 2% and 2.5% ratios differ because their denominators differ; neither means that exactly that percentage of individual shareholders changed their holdings.

Why it matters before you trade

Turnover provides context for an intended order's size. An order for 20,000 shares alongside 200,000 shares of daily volume would equal 10% of that day's volume. That is an order participation calculation, not a turnover ratio: its denominator is shares traded, not shares outstanding or free float.

Higher observed turnover can indicate more trading activity, but it does not establish that a particular order can be filled promptly at a particular price. Volume can cluster at certain times, reflect a one-off event or occur across prices away from the current quote. Bid-ask spread, market depth, volatility and the size and timing of an order also matter. Historical turnover may not represent liquidity when an order reaches the market.

How PreTrAIde uses it

PreTrAIde does not list a standalone stock-turnover ratio among its stated quantitative outputs. Its pre-trade analysis instead uses market-volume data to calculate an intended stock order's participation in daily volume, alongside estimated bid-ask spread, market impact and liquidity scoring and tiering. This relates the proposed quantity to observed trading activity without treating a turnover ratio as a guarantee of execution.

For a basket, PreTrAIde returns a GO, NO-GO or MODIFY verdict for each line and the basket, with a risk assessment, suggested execution strategy and plain-language reasoning. These verdicts support a decision; PreTrAIde does not place orders or act as an investment adviser.

Common mistakes

  • Omitting units or the period: 200,000 shares per day, US$10 million per day and 2% per day are not interchangeable.
  • Mixing denominators: outstanding-share turnover and free-float turnover can differ substantially.
  • Treating turnover as depth: past trades do not show how many shares are available near a quoted price now.
  • Confusing stock and portfolio turnover: one measures a stock's trading activity; the other measures changes in investment holdings.
  • Treating a multi-day total as an average daily figure: state both the measurement period and whether the figure is a total or an average.

Frequently asked questions

What is the difference between trading volume and turnover?

Trading volume counts shares traded during a period. Share turnover can mean that same count, while a turnover ratio expresses it as a percentage of shares outstanding or free float; always check the stated units.

How do you calculate free-float turnover?

Divide shares traded during the chosen period by free-float shares, then multiply by 100 to get a percentage. For example, 200,000 shares traded against an 8 million-share float equals 2.5%.

Does high turnover mean a stock is liquid?

Not necessarily. Turnover records past trading activity; execution also depends on the current bid-ask spread, available depth, volatility, order size and timing.

Related terms

Average daily volume (ADV) Average daily volume (ADV) is the average number of shares traded per trading day over a specified period, used to gauge a stock’s typical trading activity. Dollar volume Dollar volume is the monetary value of shares traded over a period, calculated by adding each trade’s share price multiplied by its share quantity. Free float Free float is the number of a company’s outstanding shares available for public trading after excluding shares held by insiders or other holders whose stakes are not readily traded. Participation rate Participation rate is the percentage of a stock’s trading volume represented by an order or executed trades over a specified period, indicating how large the trade is relative to market activity. 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. Portfolio turnover Portfolio turnover is the value of securities replaced through trading during a period, commonly measured as the lesser of purchases or sales divided by average portfolio value.

Liquidity

Market depth Liquidity risk Illiquid stock Days to liquidate Amihud illiquidity ratio Liquidity tier Daily liquidity ratio (DLR) Trading halt All glossary terms →

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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.