What is the McClellan oscillator?
The McClellan Oscillator is a market breadth indicator based on the number of rising and declining issues on a stock exchange, such as the New York Stock Exchange (NYSE) or the NASDAQ.
The indicator is designed to identify significant shifts in mood in the indexes, known as breadth thrusts. It also aids in determining the strength of an index trend through divergence or confirmation.
How to Find the McClellan Oscillator
- Track Advances: Declines on a stock market for 19 and 39 days to begin the calculation. Take a simple average rather than an exponential moving average (EMA) for these.
- In the 19- and 39-day EMA formulas, use these fundamental values as the prior-day EMA values.
- Determine the 19- and 39-day EMAs.
- Determine the value of the McClellan oscillator.
- Now that the value has been computed, utilize it for the prior-day EMA in the following calculation. Instead of basic averages, begin calculating EMAs for the formula.
- The steps are the same when using the adjusted formula, except that ANA is used instead of advances and declines.
What does the McClellan oscillator indicate?
The McClellan Oscillator is a market breadth indicator that technical analysts can use in conjunction with other tools to analyze the overall status of the stock market and the strength of its current trend. Because the indicator is based on the price movements of all the companies on an exchange, it is compared to the price movements of indexes that reflect that exchange or significant indexes such as the S&P 500.
Positive and negative figures reflect whether more stocks are rising or falling on average. When the 19-day EMA is above the 39-day EMA, the signal is positive; when the 19-day EMA is below the 39-day EMA, the indicator is negative. A rising and positive signal indicates that exchange equities are accumulating. A declining or negative indication indicates that equities are being sold. Typically, such activity reinforces the index’s present trend.
Crossovers from positive to negative, or vice versa, may indicate that the trend in the index or exchange being followed has shifted. A breadth thrust occurs when the indicator makes a big move, often of 100 points or more, from negative to positive territory. It signifies that a high number of equities rose following a bearish move. Because the stock market tends to climb over time, this is a positive sign that the index has reached a bottom and prices are moving overall upward. The present index trend may be weak when index prices and the indicator move in opposite directions. When the oscillator rises while the index falls, this is called bullish divergence. This suggests that the index may soon begin to rise as more equities begin to rise.
When the index rises while the indicator falls, this is referred to as a bearish divergence. This suggests that fewer stocks are fueling the rally, and prices may begin to fall.3
What Is the Difference Between the McClellan Oscillator and the McClellan Summation Index?
Sherman and Marian McClellan created the McClellan Summation Index and the McClellan Oscillator.4 The McClellan Summation Index is calculated by adding the McClellan Oscillator for the current day to the McClellan Summation Index for the prior day. In other words, unlike the oscillator, the summation index is a cumulative metric. While the oscillator is better for studying short-term patterns, the summation index is better for examining larger and longer-term price trends.
The McClellan Oscillator’s Limitations
The indicator generates a lot of indications. Breadth thrusts, divergence, and crossings occur regularly, but not all of these signals cause the price or index to move in the predicted direction. Because the indicator is prone to creating misleading signals, it should be utilized with price action analysis and other technical indicators.
The indication can sometimes be highly choppy, rapidly shifting between positive and negative areas. Such movement implies a bumpy market, but this isn’t obvious until the indicator makes this whipsaw motion several times. Before relying on the indicator for trading purposes, investigate how it behaves over long periods and in various market conditions.
Conclusion
- You can use the McClellan oscillator method on any stock market or group of stocks.
- If the number is above zero, the index is going up. If it’s below zero, the index is going down.
- If the oscillator is going down while the index is going up, the index might start going down, too. If the oscillator and the index are going down, the index might start going up soon. The word for this is separation.
- A width push is a significant change from a negative reading to a positive reading, like going from -100 points to +100 points. It could mean the stock market is going through a substantial change from a decline to an upswing.

