On-Balance Volume cumulates buying and selling pressure. Learn how a rising OBV with flat price signals accumulation ahead of a potential breakout.
On-Balance Volume (OBV) cumulates volume directionally: it adds the period's volume on up days and subtracts on down days. Rising OBV means net buying pressure even if price doesn't yet reflect it. A bullish OBV divergence (OBV trending up while price stays flat or weak) is the classic accumulation signal — institutional buyers absorbing supply patiently before the breakout.