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Glossary

Oversold

Oversold describes a stock, or other asset, whose price has fallen so far or so fast that technical indicators suggest selling pressure may have been excessive, possibly setting up a price rebound.

What Is Oversold?

Oversold is a label used in technical analysis for a security whose price has dropped enough, quickly enough, that recent selling may have pushed it below a level traders consider sustainable. The word describes a condition shown on a price chart rather than a verdict on the company's value. An oversold stock has not been proven cheap. It has been sold heavily in a short period, and some traders read that as a sign a rebound could follow.

The opposite condition is overbought, where rapid buying has pushed prices up.

How Traders Identify Oversold Conditions

Oversold readings are usually measured with a momentum indicator. The most widely used is the relative strength index (RSI), which compares the size of recent gains with recent losses on a scale from 0 to 100. By a common convention, a reading below 30 is considered oversold, and a reading above 70 is considered overbought. These cutoffs are rules of thumb rather than fixed standards, and many traders adjust them.

Other tools include the stochastic oscillator and Bollinger Bands, where a price closing below the lower band is sometimes read as an oversold signal.

RSI = 100 − (100 ÷ (1 + RS))

In this formula, RS is the average gain divided by the average loss over a set period, commonly 14 days.

Limitations and Risks

An oversold reading does not guarantee a price increase. A security can remain oversold for an extended period during a downtrend, especially when the decline reflects weakening business results or broader market weakness. Indicators can also flag oversold conditions repeatedly during a strong decline, so signals may appear early and fail.

Analysts often combine oversold readings with other information, such as trading volume, support levels, earnings reports, and fundamental analysis. Some also watch for mean reversion patterns, which assume prices tend to return toward an average over time. That assumption does not always hold.

Why It Matters to Investors

Understanding oversold conditions helps investors interpret price movements without assuming that every sharp decline signals a rebound. The term describes what the indicators show. The underlying reason for the decline still requires separate analysis.

Updated October 19, 2026. For general education only; not financial, tax or legal advice.

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Related Terms

Technical Analysis

Technical analysis is a method of evaluating securities by studying past market prices and trading volume, using charts and statistical indicators to identify patterns and forecast likely future price movements.

Overbought

Overbought describes a security whose price has risen sharply and may be due for a decline, often judged by technical indicators such as the relative strength index.

Relative Strength Index (RSI)

The Relative Strength Index is a momentum oscillator that measures the speed and size of recent price changes on a scale from 0 to 100, often used to flag overbought or oversold conditions.

Downtrend

A downtrend is a sustained pattern in which an asset's price or a market index moves generally lower over time, marked by successively lower peaks and troughs.

Mean Reversion

Mean reversion is the theory that prices, returns, and other financial measures tend to move back toward their long-run average over time after moving far from it.

Stochastic Oscillator

A stochastic oscillator is a technical momentum indicator that compares a security's closing price with its recent price range, producing values from 0 to 100.