What Is a Follow-Through Day for Investing?

A follow-through day is a technical market signal that investors use to identify when a rally after a market decline may be gaining strength. It occurs when a major stock index posts a strong gain on higher trading volume after a rally attempt has already begun. While this signal does not guarantee that stocks will continue rising, investors may view it as evidence that buying activity is returning to the market.

Working with a financial advisor can help you determine how short-term market signals fit into your broader investment strategy.

Stock Market Cycles

The stock market regularly moves through periods of expansion and decline. Stock market corrections can interrupt rising market. Longer or more severe market downturns can end up turning around into bull markets.

The timing and duration of these movements are difficult to predict. Technical investors therefore use price, trading volume and other market data to evaluate whether market conditions may be changing. A follow-through day is one signal that can help in that assessment.

What Is a Follow-Through Day for Investing?

A follow-through day is a concept that investor William J. O’Neil’s developed as part of his market methodology. The signal occurs on the fourth day or later of a rally attempt when a major index, such as the S&P 500 or Nasdaq Composite, records a substantial gain on greater trading volume than the previous session.

The process starts after a market decline. When an index stops making new lows and closes higher, that session can establish the first day of a rally attempt. The rally remains intact as long as the index does not undercut the relevant low. Beginning on day four, investors using this method watch for a sufficiently large advance accompanied by higher volume.

Higher volume matters because it can indicate stronger participation in the advance. A qualifying move is treated as evidence that the rally may have enough support to develop into a broader uptrend.

A follow-through day does not confirm that a new bull market will last. Some signals fail, and the index subsequently returns to its previous lows. For that reason, investors using the O’Neil approach typically look at the signal alongside the performance of leading stocks and subsequent market activity rather than treating one session as a reason to become fully invested.

Follow-Through Day Example

The financial crisis provides an example of how the signal can appear around a major market turning point. U.S. stocks suffered steep losses during the 2007 to 2009 bear market, with the S&P 500 ultimately losing more than half of its value from its 2007 peak.

The market reached its closing low in March 2009. It subsequently began a rally that developed into a long-running bull market. Under the O’Neil methodology, investors would have watched the early sessions of that rebound for stronger price gains accompanied by increased trading volume before treating the rally as more credible.

The example also illustrates an important limitation of follow-through days: they are designed to identify evidence of a possible change in market direction after it begins rather than predict the exact market bottom in advance.

Spotting a Market Bottom

Identifying a potential market bottom can help investors evaluate when conditions may be improving after a correction or bear market. Price movements in major stock indexes, trading volume and the performance of leading stocks can provide more information than the movement of a single company.

A follow-through day is one way of measuring those changes. Days four through seven of a rally attempt have historically been considered particularly significant under the O’Neil methodology, although qualifying signals can occur later.

Investors can also watch what happens after the signal. Additional gains on strong volume and breakouts by leading stocks can support the case for an improving market. A return below the previous market low, by contrast, can indicate that the rally attempt has failed.

Why Trading Volume Matters

Price alone does not provide all of the information used to identify a follow-through day. Trading volume is also central to the signal because it shows how much buying and selling occurred while an index moved higher.

Under the O’Neil methodology, the qualifying index gain must occur on greater volume than the preceding trading session. Volume does not necessarily have to exceed its longer-term average. Rather, the comparison with the previous day’s activity simply distinguishes a stronger advance from an ordinary up day.

Investors may interpret a sharp index gain accompanied by heavier trading as evidence of increased demand for stocks. Even then, subsequent market behavior should be taken into account. Continued strength can provide additional support for the rally, while heavy selling shortly afterward may weaken the signal.

Cues for a Market Turn

Investors who use technical indicators have several ways to evaluate whether market conditions may be shifting:

Fear and greed index: This metric attempts to measure investor sentiment using several market indicators. Extreme readings can provide context about whether investors have become unusually optimistic or pessimistic.
Moving averages: Investors can compare shorter and longer-term moving averages to evaluate price trends. A shorter-term average moving above a longer-term average may be interpreted as a bullish signal. The reverse can indicate weakening momentum.
Relative strength index: The relative strength index compares the strength of recent upward and downward price moves. Traders may use its readings to assess whether buying or selling has become unusually pronounced.
Bollinger Bands: Bollinger Bands place bands around a moving average based on price volatility. Traders use changes in price relative to those bands as one way to evaluate momentum and volatility.
Interest rates: Changes in interest rates can affect stock valuations and economic activity. Lower rates can support equities in some circumstances. However, the relationship is not consistently inverse. Stocks can rise or fall during both tightening and easing cycles.

Ultimately, none of these indicators can reliably identify a market bottom on its own. Investors who use market timing strategies typically combine several measures rather than relying on a single signal.

Bottom Line

A follow-through day occurs after a market rally attempt has begun. It involves a significant advance by a major stock index on greater volume than the previous trading session. Under the O’Neil methodology, investors use the signal as evidence that a market recovery may be gaining support. However, this signal does not guarantee that the rally will continue. Investors will want to consider the signal alongside trading volume, leading stocks and other market indicators.

Tips for Investing

If you’re having trouble making sense of the stock market, you can get help investing from an experienced financial advisor. Finding a qualified financial advisor doesn’t have to be hard. SmartAsset’s free tool matches you with financial advisors who serve your area, and you can interview your advisor matches at no cost to decide which one is right for you. If you’re ready to find an advisor who can help you achieve your financial goals, get started now.
Now that you have an understanding of follow-through day, let’s dive into the details. Here are five strategies for investing in a bear market.