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Quotes, previous close and percentage change
Updated 4 August 2026 · 4 min read · 16 Contents
Plain-language meaning
Quotes, previous close and percentage change means examining how issuers, instruments, venues, sessions, prices and benchmarks create market evidence with the identity, period, unit, source and limitations kept visible. It is a disciplined way to describe evidence, not a shortcut to an investment conclusion.
Learning objectives #
After this chapter you should be able to define quotes, previous close and percentage change, identify the evidence needed to use it, distinguish a reported zero from unavailable evidence, and explain why unlike instruments or periods may not be comparable.
Prerequisites #
Read “Trading sessions, time zones, holidays and settlement” first. Be comfortable checking an exact listing or instrument, its source, observation date, native currency and unit. When any one of those is unknown, pause the comparison and record the gap.
Core concept #
Percentage change requires a compatible previous completed close as denominator. Preserve raw facts separately from interpretation, and retain the denominator, time window, classification rule and provenance that make the evidence reproducible.
Method #
For quotes, previous close and percentage change, first identify the exact evidence named in this chapter: Percentage change requires a compatible previous completed close as denominator. Then freeze identity and period, collect source-backed inputs with units, calculate or classify only compatible evidence, and record contrary facts and unavailable fields.
Where it appears in XMarketRadar #
Use Search, Dashboard, Market Details, movers, sectors and comparison screens to confirm the exact venue and observation. A displayed field is useful only with its source and as-of context. If XMarketRadar does not calculate this chapter’s concept directly, use the chapter as an educational checklist and retain the supporting primary document or screen URL in the research workspace.
Worked example #
Current 105 minus previous close 100 is +5 CU and +5%; previous close 0 makes percentage unavailable. Module context: Illustrative CU prices move from 100 to 105 across two completed sessions, so the period change is 5 CU or 5%; a partial third-session quote is kept separate. This is an illustrative audit trail, not live data, a target or an expected outcome.
Interpretation #
Interpret the result in the direction defined by the field, not by an assumed desirable outcome. Higher, lower, positive and negative can each have different meanings by context. Compare the observation with its own history or a compatible benchmark, and label conclusions as observations, interpretations or user decisions.
Limitations and common mistakes #
Substituting an intraday tick or unmatched adjusted close for previous close. Ticker reuse, stale quotes, thin depth, corporate actions and changing index membership can invalidate a simple comparison. A precise calculation can still mislead when the source is stale, the denominator changed, or a classification hides important detail.
Market and jurisdiction differences #
NSE, BSE, NASDAQ, NYSE, LSE, TSX/TSXV, TSE and KRX have distinct identifiers, sessions, settlement rules, currencies and price scales. Exchange rules, accounting conventions, calendars, taxes, disclosure timing, quote scale and licensed coverage can differ. Verify the current primary source for the relevant venue; registry support alone does not prove that every field is available.
Key takeaways #
For quotes, previous close and percentage change, remember this boundary: Substituting an intraday tick or unmatched adjusted close for previous close. Keep the evidence exact, dated and source-backed; publish missing information as unavailable rather than manufacturing a value.
Practice #
Reproduce this historical scenario from source-labelled inputs: Current 105 minus previous close 100 is +5 CU and +5%; previous close 0 makes percentage unavailable. Then change one input, preserve the original period and unit, and explain whether the result changes or becomes unavailable. Write the identity, source, date, unit and failure condition, then state exactly what would display as —.
Knowledge check #
Reveal answer and explanation
Question: which mistake would invalidate a review of quotes, previous close and percentage change? Answer: Substituting an intraday tick or unmatched adjusted close for previous close. Explanation: the chapter requires the stated identity, period, unit and compatible evidence; a missing required input remains — rather than 0.
Educational use only #
This chapter is descriptive education, not investment advice, a forecast, a recommendation, a suitability assessment or an instruction to buy, sell, rebalance, trade or place an order. XMarketRadar’s broker connections remain read-only.