On-Balance Volume (OBV) was developed by Joseph Granville in 1963 and introduced in his book "Granville's New Key to Stock Market Profits." OBV is a cumulative volume-based indicator that adds volume on up days and subtracts volume on down days. The theory is simple but powerful: volume precedes price. Smart money (institutional investors) accumulates shares before a big move up, which shows in OBV rising before price. Distribution (selling) shows in OBV falling before price drops.
The OBV calculation is straightforward: If today's close > yesterday's close: OBV = Previous OBV + Today's Volume. If today's close < yesterday's close: OBV = Previous OBV - Today's Volume. If today's close = yesterday's close: OBV = Previous OBV (unchanged). The absolute value of OBV does not matter — what matters is the direction and trend of OBV relative to price.
OBV for trend confirmation: When OBV is rising along with price, the uptrend is healthy — volume is confirming the price move. When OBV is falling along with price, the downtrend is confirmed. Confirmation gives you confidence that the trend is real and not a fake move driven by a few large orders. In the Egyptian market, confirmation is especially important because some stocks have low liquidity, making them susceptible to manipulation.
OBV divergence is where the indicator truly shines. Bullish divergence: price makes a lower low but OBV makes a higher low. This means that despite the price declining, more volume is flowing in on up days than on down days — accumulation is happening beneath the surface. This often precedes a significant rally. Bearish divergence: price makes a higher high but OBV makes a lower high — distribution is occurring even as price climbs. This warns of an impending decline.
Accumulation detection with OBV is critical for identifying smart money activity. When OBV rises steadily while price moves sideways, institutions are quietly buying. This "accumulation phase" often precedes a breakout. Conversely, when OBV declines while price holds steady, distribution is occurring — institutions are selling into strength, and a breakdown may follow. FoudaLens's "Smart Money Detection" feature uses OBV divergence as one of its key inputs.
OBV breakouts can also be used as trading signals. When OBV breaks above its own resistance level (a prior high), it suggests that buying pressure has reached a new intensity. If price has not yet broken out, an OBV breakout can serve as an early entry signal. Similarly, OBV breaking below support warns of increasing selling pressure.
Practical OBV tips for the Egyptian market: (1) OBV works best on liquid stocks with consistent volume — avoid applying it to stocks that trade sporadically. (2) Use OBV divergence as an early warning, but always wait for price confirmation before acting. (3) Combine OBV with a moving average (20-period MA of OBV) to smooth the signal. (4) On the EGX, watch for OBV divergence near EGX30 index levels of support/resistance for broad market signals. (5) OBV is most useful on daily and weekly timeframes. This is not financial advice.
This content is for educational purposes only and does not constitute financial advice. Always do your own research before making investment decisions.