On-Balance Volume (OBV)
A cumulative volume indicator that tracks whether smart money is quietly accumulating or distributing a stock before the price move becomes obvious.
Definition
On-Balance Volume (OBV) is a momentum-based technical indicator developed by Joe Granville that runs a cumulative total of volume, adding the full day's traded shares or contracts when the close is higher than the prior close and subtracting them when the close is lower. The absolute level of OBV carries no inherent meaning; what matters is the direction and slope of the OBV line relative to price. OBV works hand-in-hand with concepts like divergence and momentum indicators to give traders an early read on trend health.
Why it matters
Volume is often called the "fuel" behind price moves, and OBV distils that idea into a single running line. In Indian markets — where institutional participants such as FIIs, domestic mutual funds, and proprietary desks collectively move large blocks — the footprints of accumulation or distribution frequently show up in volume before price fully reacts. A stock on the NSE that is quietly being accumulated will tend to post higher OBV even on days when price seems to be going sideways, because informed buyers absorb supply without pushing price dramatically higher.
OBV is particularly useful for traders watching Nifty 50 constituents and mid-cap names ahead of results seasons or index rebalancing events. When OBV makes higher highs while price is still consolidating, it signals that large participants are building positions — a potential precursor to a breakout. The reverse, where OBV makes lower lows while price holds steady or edges up, is a classic distribution warning that a reversal may be near.
Formula
OBV is calculated session by session:
If Closetoday > Closeyesterday: OBV = OBVprev + Volumetoday
If Closetoday < Closeyesterday: OBV = OBVprev − Volumetoday
If Closetoday = Closeyesterday: OBV = OBVprev (unchanged)
The starting value is arbitrary; only the trend of the line matters. Traders often plot a moving average over OBV itself to smooth out noise and generate clearer signals.
Example
Suppose a hypothetical mid-cap NSE stock is trading in a range between Rs 480 and Rs 500 for three weeks. During this consolidation, assume the stock closes up on six consecutive sessions, each on volume roughly 40% above its 20-day average, while the four down-days see below-average volume. OBV would climb steadily even though price remains range-bound. A technician observing this pattern would interpret rising OBV within a flat price channel as institutional accumulation, and watch for a breakout above Rs 500 as confirmation that the smart money's positioning is about to be rewarded.
Analyse volume trends on TradePulse
Combine OBV signals with live open interest data to confirm breakouts before they run.