OBV (On-Balance Volume)
What Is OBV?
A technical momentum indicator that uses volume flow to predict changes in stock price. It is often referred to simply as "OBV" on trading platforms.
OBV stands for On-Balance Volume. It is a technical indicator found on almost all charting platforms (TradingView, Thinkorswim, etc.) usually displayed as a single line below the price chart. The theory behind OBV is simple: Volume precedes price. * Rising OBV: Buyers are aggressive (accumulation). * Falling OBV: Sellers are aggressive (distribution). When the OBV line moves in the same direction as the price, the trend is confirmed. When they move in opposite directions (divergence), a reversal is likely.
Key Takeaways
- OBV is a cumulative total of buying and selling volume. It adds volume on up days and subtracts it on down days.
- The primary use of OBV is to confirm price trends. A rising price should be accompanied by a rising OBV.
- Divergence between price and OBV is a strong reversal signal. If price makes a new high but OBV fails to, the trend is weak.
- OBV is considered a "leading indicator" because volume changes often precede price movements.
- Traders watch for OBV breakouts (moving above previous highs) to signal potential price breakouts.
How to Read the OBV Line
The absolute value of the OBV number doesn't matter. Focus on the trend and slope of the line. * Uptrend: If OBV is making higher highs and higher lows, the uptrend in price is supported by volume. * Downtrend: If OBV is making lower highs and lower lows, the downtrend is strong. * Range: If OBV is moving sideways, the market is undecided.
Quick Guide: Trading Signals with OBV
Here are the key signals to look for:
- Confirmation: Price breaks resistance, and OBV breaks its own resistance. This is a strong buy signal.
- Bullish Divergence: Price makes a lower low, but OBV makes a higher low. This suggests selling pressure is drying up. Look for a reversal up.
- Bearish Divergence: Price makes a higher high, but OBV makes a lower high. This suggests buying pressure is weak. Look for a reversal down.
- False Breakout: Price breaks resistance, but OBV does not. The breakout is likely to fail.
Example: Spotting a False Breakout
Scenario: A stock is trading in a range between $50 and $60.
Tips for Using OBV
Combine OBV with a lagging indicator like Moving Averages. The Moving Average confirms the trend, while OBV warns of potential reversals. Also, avoid using OBV on very illiquid stocks where small trades can distort the volume data.
FAQs
OBV works on all timeframes, but it is most reliable on Daily and Weekly charts. On very short timeframes (1-minute), volume noise can generate false signals.
They measure different things. RSI measures price momentum (speed of change), while OBV measures volume flow. Using them together provides a more complete picture.
The starting point of the calculation is arbitrary (often 0). If there has been more selling volume than buying volume since the chart started, the number will be negative. This is normal and doesn't affect the signal.
Joe Granville introduced OBV in his 1963 book "Granville's New Key to Stock Market Profits".
The Bottom Line
OBV is a classic technical indicator that helps traders see the "smart money" flow behind price movements. By focusing on the relationship between volume and price—specifically divergences—traders can identify false breakouts and potential reversals earlier than with price-only indicators. It is a simple yet effective tool for gauging market sentiment.
More in Technical Indicators
At a Glance
Key Takeaways
- OBV is a cumulative total of buying and selling volume. It adds volume on up days and subtracts it on down days.
- The primary use of OBV is to confirm price trends. A rising price should be accompanied by a rising OBV.
- Divergence between price and OBV is a strong reversal signal. If price makes a new high but OBV fails to, the trend is weak.
- OBV is considered a "leading indicator" because volume changes often precede price movements.