On-Balance Volume (OBV)
On-Balance Volume (OBV) is a cumulative volume-based indicator developed by Joseph Granville that adds volume on up-days and subtracts it on down-days to measure the flow of buying and selling pressure in a security.
Joseph Granville introduced On-Balance Volume in his 1963 book Granville's New Key to Stock Market Profits, positioning it as a leading indicator based on the thesis that volume precedes price. The underlying logic was that institutional accumulation and distribution of large positions occurred over time through many smaller trades; OBV was designed to capture this cumulative flow. A rising OBV alongside rising price was considered confirmation of a healthy uptrend; rising price with falling OBV was interpreted as a divergence warning that the advance lacked participation.
The calculation was elegantly simple: if today's closing price was higher than yesterday's, the day's full volume was added to a running total; if today's close was lower, the day's volume was subtracted; if the close was unchanged, OBV remained constant. The absolute value of OBV was not meaningful in isolation — only its direction and divergence from price carried analytical significance.
On NSE, where daily volume data for cash equity and F&O segments was transparently reported, OBV was a staple tool for Indian technical analysts assessing accumulation and distribution phases in individual large-cap and mid-cap stocks. During pre-breakout phases of well-known Nifty 500 stocks, traders examined whether OBV was making new highs even as price consolidated in a range. A stock whose OBV climbed steadily while price marked time in a narrow band was considered to be under quiet institutional accumulation — a setup that some practitioners used to assess positioning ahead of a potential volume-driven breakout.
The limitation of OBV on Indian markets was the influence of F&O expiry-related volume spikes. On the last Thursday of each month — monthly derivatives expiry day — abnormally high volumes in cash equities and index futures inflated or deflated OBV sharply, sometimes distorting the cumulative line in a way that was not indicative of genuine directional conviction. Analysts who tracked OBV over longer timeframes sometimes normalised for expiry-day volume or simply noted the distortion in their analysis.
OBV was most powerful when used on weekly charts of sector indices and heavyweight individual stocks. For instance, consistently rising OBV in a major banking stock over a three-to-six month period while its price consolidated near a resistance zone was a type of volume-price divergence that many analysts flagged as a potential precursor to a breakout. The indicator's simplicity made it accessible but required patience and a multi-week perspective to apply effectively.