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What the price and percentage change mean
A quote’s price is an amount in dollars (or another currency). It may represent the latest eligible trade, or a bid or ask, depending on which field you are viewing. Percent change is a comparison against a reference value, commonly the previous close. Nasdaq lists last trade, previous close, net change, and percent change as separate quote fields; its data documentation describes the change fields as comparisons with the previous close: Nasdaq equities data documentation.
In simplified form, a provider may calculate percentage change as (current comparison price − reference price) ÷ reference price × 100. For example, if the comparison price and reference price are both $25.00, the change is 0%. A non-zero price is entirely consistent with no change relative to that reference.
Why a quote may display 0.00%
The comparison is zero at the displayed precision
If the current comparison price equals the reference price, the percentage change is zero even though both prices are above zero.
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A small movement may be rounded
If a service displays percentages to two decimal places, a sufficiently small non-zero movement could appear as 0.00%. That is only a possible explanation: display precision and rounding rules vary by provider, and the available documentation does not establish a universal threshold. Check the app’s help page or a more precise data view before treating rounding as the cause.
The fields may use different prices or update times
The quoted price and change may not refer to the same kind of price or update at the same time. For instance, one field might show a bid or ask while another is calculated from a last sale. A timestamp can also help identify whether the displayed information is delayed or belongs to a different trading session; do not assume a feed delay without confirming the provider’s details.
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How the previous close can affect the comparison
“Previous close” is a reference value, not necessarily the latest price shown on the screen. Nasdaq’s technical documentation gives an illustrative example with a last price of 10.02, previous close of 9.99, net change of 0.03, and percent change of 0.3003. Those values demonstrate the relationship among the fields; they are documentation examples, not live prices or a universal display format. See Nasdaq Data Link’s quote documentation.
Closing-price conventions can also differ across data services. Investor.gov says the regular trading session for many U.S. markets runs from 9:30 a.m. to 4:00 p.m. Eastern Time, and describes the closing price generally as the last price at which a stock trades during the regular session. It notes that some publications and vendors include after-hours trades in the day’s closing price, while others use the 4:00 p.m. price and report after-hours activity separately. Different reference closes can therefore produce different apparent changes. See Investor.gov’s explanation of closing prices.
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What to check in your quote app
- Check the timestamp. Note when the quote was updated and whether the app identifies it as real-time or delayed.
- Identify the price field. Confirm whether the quoted amount is the last trade or sale, a bid, or an ask.
- Find the reference close. Compare the displayed previous close with the price used to calculate the percentage change.
- Check the trading session. Determine whether the quote is for regular hours or includes extended-hours activity, and how the provider defines its close.
- Check precision and methodology. Look for the app’s explanation of percentage rounding, update frequency, and change calculation. If comparing two services, use the same symbol and compare all these fields.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
