OBV (On Balance Volume)
On Balance Volume, or OBV, is a cumulative volume indicator developed by Joseph Granville in 1963. It adds the day’s volume to a running total on up-close days and subtracts it on down-close days. The result is a single line that tracks whether buying or selling pressure is dominating — often hinting at where the next big move will come from, before price actually moves.
Key takeaways:
- OBV is a running cumulative measure of volume flow, not price.
- Rising OBV with rising price confirms an uptrend; falling OBV with rising price warns of weakness.
- It works best on liquid stocks and indices, where volume data is meaningful.
- Divergence between OBV and price is the most powerful signal it generates.
- OBV is best used as a confirmation tool, not a stand-alone entry signal.
How OBV is calculated
Start with an arbitrary number (say zero). On any day the close is higher than the previous close, add that day’s volume to the running total. On any day the close is lower, subtract the volume. If the close is unchanged, OBV stays the same. The cumulative line is OBV.
Reading OBV
- Trend alignment: OBV trending up alongside price confirms the move.
- Bearish divergence: Price makes a new high but OBV makes a lower high — institutional selling may be hidden in the rally.
- Bullish divergence: Price makes a new low but OBV makes a higher low — selling pressure is easing.
- Breakouts: OBV breaking out of a long range often precedes a price breakout.
Worked example on a stock
Consider a mid-cap stock that has been moving sideways for two months. OBV slowly trends upward over that time — quietly indicating accumulation. When the stock finally breaks above its consolidation range, the prior OBV up-trend strengthens the case for sustainable upside.
Where OBV shines
- Trending stocks with consistent volume profiles.
- Index ETFs and futures, where volume data is reliable.
- Identifying accumulation/distribution in mid-caps.
- Confirming breakouts in chart patterns like triangles and flags.
Limitations
OBV adds (or subtracts) the entire day’s volume based on a single close vs close comparison. A day with a slight up-close gets the same treatment as a strong up-day. Variants like Chaikin Money Flow address this by considering where the close sits within the day’s range. OBV can also be misleading in stocks with low or erratic volume, so stick to liquid names.
Combining OBV with other tools
- Trend lines: Draw on OBV the same way you do on price; OBV trend breaks often precede price breaks.
- Moving average of OBV: A short MA on OBV smooths noise and shows direction.
- Volume profile + OBV: Volume profile shows where volume happened by price; OBV shows accumulation/distribution over time. Together they paint a complete picture.
Frequently asked questions
Is OBV reliable on Indian small-caps?
Less so. Small-cap volumes are spiky; OBV signals can be distorted by single days of unusual activity.
Should OBV always match price?
In healthy trends, yes. Divergences are the interesting signals — they hint that the trend may be running out of steam.
What time frame should I use for OBV?
Same as your primary chart. Daily for swing, hourly for intraday, weekly for positional.
Is OBV good for option trading?
You can apply it to the underlying. Option volume is more useful for open-interest analysis than for OBV.
