OHLCV is an acronym for Open, High, Low, Close, and Volume—the standard tabular data structure used to summarize market price action and trading activity over a discrete time bucket (such as 1 minute, 1 hour, or 1 day). Each interval captures the first price traded, the peak price reached, the lowest price recorded, the final settlement price, and the cumulative quantity of shares or contracts exchanged.
How it works
At the start of the time window, the first execution price sets the Open.
As trades occur throughout the interval, running extreme values update the High and Low.
The final execution within the interval sets the Close, while all executed transaction quantities are summed into the interval Volume.
Why it matters
OHLCV compresses millions of continuous order book events into lightweight tabular rows, dramatically reducing data storage and computational costs.
Because intrabar path information is discarded, testing rules on OHLCV data can suffer from sequencing ambiguities when both profit targets and stop-losses fall within the High-Low range.
A simple market example
A daily OHLCV bar for an ETF reports: Open: $450.10, High: $454.80, Low: $449.20, Close: $453.50, Volume: 18,200,000 shares. A trader knows the full daily price envelope and turnover, but cannot see whether the High occurred at 10:00 AM or 3:30 PM.
Common mistakes
Assuming that an OHLCV bar shows the exact chronological path price traveled between the Open and the Close.
Treating the volume figure as purely buyer-driven or seller-driven without examining bid-ask execution details.
Frequently asked questions
Why is OHLCV the standard for charting platforms?
It provides the maximum visual summary of volatility, trend direction, and trading liquidity while keeping network bandwidth and rendering overhead extremely low.
Can OHLCV bars be built based on metrics other than time?
Yes. Quantitative traders often construct volume bars (e.g., a new bar every 1,000 shares) or tick bars (a new bar every 500 trades) to normalize activity across quiet and volatile periods.
What is the difference between Volume and Open Interest in futures OHLCV?
Volume measures total contracts traded during that interval; Open Interest measures the total number of outstanding open derivative contracts currently held by market participants at the end of the day.
Educational content only. Definitions describe common market usage and may vary by jurisdiction, instrument, or institution.