Quickly identify market maker movements with the OBV indicator—Master the three major buy and sell signals

In stock trading, many investors struggle to accurately judge the intentions of major players, often becoming flustered amid market fluctuations. The relationship between trading volume and stock price often hides the true thoughts of these players. The OBV indicator, as a classic technical analysis tool, can help traders gain a clearer insight into the wash trading actions and true intentions of these players by tracking changes in trading volume.

How the OBV Indicator Works — Gaining Insight into Market Energy Through Volume

The full name of the OBV indicator is the On-Balance Volume indicator, also known as the Accumulation/Distribution line. Its core idea is to convert daily trading volume into a cumulative numerical trend line, which is then compared with price changes to determine the gathering and dispersal of market popularity and the flow of funds.

This indicator follows a simple yet profound logic: when the stock price rises, the buying power in the market is strong, and trading volume should be seen as a manifestation of accumulated popularity; conversely, when the stock price falls, the trading volume represents a signal of dispersing popularity. OBV translates this perspective into a specific calculation method.

Two Calculation Methods for OBV:

The simple version formula is: OBV = Previous Day OBV ± Current Day Volume. The judgment rule is: if the current day’s closing price is higher than the previous day’s closing price, a positive sign is taken; if lower, a negative sign is taken; and if flat, zero is taken.

The complex version formula is more precise: OBV = Previous Day OBV + Current Day Volume × Long/Short Ratio Net. The Long/Short Ratio Net = [(Closing Price - Lowest Price) - (Highest Price - Closing Price)] ÷ (Highest Price - Lowest Price). Although the complex version is more difficult to calculate, its accuracy far exceeds that of the simple version.

Taking a specific stock as an example, if the previous day’s OBV is 2000, today’s trading volume is 1000, the closing price is 9.5 yuan, the highest price is 10.2 yuan, and the lowest price is 9.2 yuan. Using the complex version for calculation: Long/Short Ratio Net = [(9.5 - 9.2) - (10.2 - 9.5)] ÷ (10.2 - 9.2) = -0.4, therefore OBV = 2000 + (-0.4) × 1000 = 1600. Through this method, OBV can more accurately reflect the true capital situation in the market.

Three Major Buy Points: When to Enter the Market and Follow the Major Players to Profit

Mastering the buy signal of the OBV indicator is key to successfully bottom-fishing and trend-following. The three common buying opportunities in practice are:

Buy Point One: Breakthrough After Long-Term Consolidation

When OBV consolidates within a certain range for more than three months, once the indicator line breaks upward through the consolidation area, it constitutes a clear buy signal. The beauty of this buy point lies in the fact that the longer the consolidation time, the larger the potential upward space in the future. This is because long-term consolidation represents a high degree of consensus among market participants; once this consensus is broken, a new trend often forms a strong driving force.

At this point, if OBV successfully breaks through previous highs and is accompanied by a significant increase in stock price, it indicates that new buying forces are entering the market to push up the stock price, and investors can actively participate.

Buy Point Two: Bottom Divergence Phenomenon

When the stock price continuously creates new lows while the OBV indicator continues to rise, a phenomenon known as “bottom divergence” forms. This is an extremely reliable bullish signal. The occurrence of divergence indicates that although the stock price is falling, funds are not flowing out in large quantities; instead, there are signs of quietly entering the market.

In actual operations, even if the peaks and troughs of OBV are not very obvious during its rise, as long as there is a clear reversal signal on the candlestick chart, or the stock price stops creating new lows, investors can start building positions. Once the stock price rebound is confirmed, the timing for further increasing positions is ripe.

Buy Point Three: Healthy Trend of Simultaneous Upward Movement

When both the stock price and the OBV indicator rise slowly and their upward slopes are roughly equal, this represents the healthiest and most sustainable upward trend. This indicates that for every unit the stock price rises, there is a corresponding trading volume to support it, matching the purchasing power of market participants with the extent of the stock price increase.

In this form, as long as the stock price experiences a slight pullback and then starts to rise again, it can be confirmed that the trend will continue upward, and investors can buy on the rise.

Three Major Sell Points: Identifying Top Signals to Exit Decisively

Mastering sell points is equally important; exiting in a timely manner often protects profits more than entering in a timely manner:

Sell Point One: Dangerous Signal of Top Divergence

Top divergence is the opposite of bottom divergence; it occurs when the stock price continuously rises while the OBV indicator continuously falls. This phenomenon signals that although the stock price is still rising, the capital force pushing the stock price upward is diminishing.

When this divergence occurs, the stock price rebound often fails to create new highs. At this point, one should consider liquidating or reducing positions, as this usually indicates that the upward trend is about to end.

Sell Point Two: Trap During Accelerating Volume

Sometimes, the OBV indicator may show an accelerated upward trend, while the stock price does not accelerate accordingly. This mismatch usually indicates that the major player is unloading at the top—massive selling occurs without being able to push up the stock price, resulting in an illusory high trading volume.

The sell point here is at the moment when OBV finishes its accelerated rise. When the stock price shows a typical top reversal pattern (such as engulfing lines or other candlestick signals), it is the time for decisive selling.

Sell Point Three: Narrow Fluctuations at High Levels Combined with Significant Price Declines

When the OBV value fluctuates within a narrow range at high levels (60-80%) while the stock price significantly decreases, even falling over 30%, this indicates that the major player may be trapped. At this point, small and medium retail investors frantically cut their positions to escape, while the major player, holding too many shares, cannot exit quickly. Short-term traders can look for rebound opportunities in conjunction with other technical indicators (like BRAR, KDJ, etc.), but still need to operate cautiously.

Advanced Tips: Five Major Trading Areas of the OBV Indicator

In practical operations, an important tip is to ignore the absolute value of OBV and instead focus on its relative position on the Y-axis. OBV is typically divided into five areas: 20%, 40%, 60%, 80%, and 100%.

Tip One: Bottom Opportunity Area (0-20%)

When the stock price experiences a significant decline, and the OBV value stabilizes in the 0-20% area, maintaining a horizontal movement at a similar level for more than a month, this indicates that the market is in a long consolidation period. At this time, most investors leave due to a lack of patience, but it actually signals that short-selling pressure is weakening and funds for buying on dips are gradually increasing. When OBV effectively begins to rise, it indicates that the accumulation phase by the major player is complete, making it the best time to enter the market.

Tip Two: Signal of the Rising Stage (Rapidly Rising from the Bottom)

When the OBV line shoots straight up from the 0-20% area, it indicates that the major player has completed the accumulation of shares and has entered the stage of pushing the stock price up. At this time, trading volume continues to expand, and as long as the OBV curve rises in sync with the stock price, bold trend-following buying can be done.

Tip Three: Signal of Major Player Being Trapped (Significant Price Decline with Low Fluctuations)

When the OBV value fluctuates within a narrow range in the 60-80% area while the stock price significantly declines over 30%, this usually indicates that due to the overall market trend, retail investors are frantically cutting their positions, while the major player cannot exit due to holding too many shares. This time, rebound trades can be conducted in conjunction with other indicators.

Tip Four: Distribution Signal (Confirmation of Top Patterns)

When OBV has risen to the 80-100% area and clearly forms a V-top, M-top, or round top, it indicates that bullish capital is about to be depleted, and the major player may distribute shares at any time. Once OBV turns downward or shows clear top divergence, investors should focus on liquidating their positions.

Combined Use of OBV with Other Indicators

Single indicators often have limitations, and OBV is no exception. Its analysis method is relatively simple, and stocks with limit up/down may lead to OBV not functioning normally. Therefore, combining OBV with other technical indicators can significantly enhance judgment accuracy.

Combination with Price Patterns: OBV has a standard confirmation effect for double top patterns. When the stock price falls from the first peak and rises again, if OBV can rise in sync and the volume-price relationship is good, a higher peak may occur; conversely, if OBV fails to rise in sync and instead falls, it may complete the double top formation, signaling that the stock price will reverse downward.

Combination with Volume Moving Averages: When OBV is rising and the 10-day moving average crosses above the 40-day moving average (for short-term use, a combination of 5-day and 20-day can be used), it is seen as a buy signal; if OBV shows no clear trend and the short-term moving average crosses below the mid-term moving average, it is seen as a sell signal.

Beyond Prediction: Establishing Correct Investment Decision-Making Thinking

Many investors invest their energy in predicting the future of the market, guessing tomorrow’s, next week’s, or even next year’s rises and falls, often falling into the trap of cyclical failures. The fundamental flaw of predictive thinking is that it assumes the market is driven by a single or a few factors, while in reality, the market is influenced by complex and changing factors.

In contrast, successful investors adopt decision-making thinking—they do not predict the future, but focus on the optimal decision at the moment. When market conditions are favorable, they think about how to maximize returns while minimizing risks; when conditions are unfavorable, they quickly assess and avoid risks.

This way of thinking requires investors to have a deep understanding of the operating rules of the market and the interrelationships of various forces. There is no need to predict specific price points; it is only necessary to assess the current operational status of various forces and whether these forces are aligned in direction. When the various forces driving the market are aligned, they can enter the market; when the directions are contradictory, they exit decisively, thus avoiding major risks while seizing great opportunities.

The OBV indicator is a powerful tool for helping investors make these judgments—it intuitively presents capital movements, allowing you to see the true intentions of major players and make the most correct decisions.