A stock can have a quoted price and show 0.00% change because the price and percentage describe different things. The price is a quoted or last-traded amount; the percentage compares a selected current price with a reference price, often the previous close. The result may be zero at the display’s precision, even though the stock still has a price.
What the price and percentage change mean
A quote’s price tells you an amount in dollars (or another currency). Its percentage change tells you how that amount compares with a reference value. Nasdaq lists last trade, last sale, previous close, net change and percent change as separate quote fields; its documentation defines the changes relative to the previous close: Nasdaq market data documentation.
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A simplified calculation is: (current comparison price − reference price) ÷ reference price × 100. If the selected current price equals the reference price, the calculated change is 0%. A non-zero price is entirely consistent with that result.
How rounding can make a small move look like zero
A display that rounds percentage change to two decimal places can show 0.00% when the actual change is small enough to round to zero. That is one possible explanation, not a diagnosis for every app: display precision and rounding rules vary by provider, and no universal threshold is established. Check the app’s field definitions or a more precise quote before assuming rounding is the cause.
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Why the reference close can differ
The percentage depends on which price is used as the reference. Nasdaq defines price change in relation to the previous day’s closing price. But “closing price” is not always presented the same way across quote sources. Investor.gov explains that some publications and market-data vendors include after-hours trades in the day’s closing price, while others use the 4:00 p.m. Eastern regular-session price as the close and show after-hours activity separately. That can affect the next day’s apparent change: Investor.gov’s explanation of closing prices.
For many U.S. markets, Investor.gov describes the regular trading session as 9:30 a.m. to 4:00 p.m. Eastern Time. A quote may also reflect extended-hours activity or a different session than the comparison value. Confirm the session and the provider’s definition before attributing a discrepancy to after-hours trading.
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Check these fields when a quote looks inconsistent
- Timestamp: Check when the quote was updated and whether the source identifies the data as real-time, delayed or extended-hours.
- Price field: Determine whether the displayed amount is the last trade or sale, rather than a bid or ask.
- Reference value: Find the previous close used for the change calculation, including whether it is the regular-session close or a vendor’s after-hours convention.
- Calculation and precision: Check how the provider defines percent change and how many decimal places it displays. Nasdaq’s documentation distinguishes timestamp, last price, previous close and change fields; update policies and display precision depend on the provider.
What Nasdaq’s example illustrates
Nasdaq Data Link’s technical documentation gives an illustrative quote with a last price of 10.02, previous close of 9.99, net change of 0.03 and percent change of 0.3003. These are documentation example values, not a current quote or a universal display format: Nasdaq Data Link intraday data documentation.
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