What Is the American Association of Individual Investors (AAII) Sentiment Survey?

The American Association of Individual Investors (AAII) Sentiment Survey is a weekly measure of investor sentiment. It reflects the opinions of individual, self-directed investors in the United States about the short-term direction of the stock market. Participants are asked whether they feel bullish, bearish, or neutral about the market’s outlook over the next six months. The results are published each Thursday and are widely followed by traders, analysts, and financial professionals as a gauge of market sentiment among retail investors.

Created in 1987, the survey is maintained by the AAII, a nonprofit organization focused on providing education and resources to help individuals make better investment decisions. The simplicity and transparency of the survey’s methodology have made it a consistent and accessible indicator of retail investor psychology for decades.

Survey Methodology

The AAII Sentiment Survey collects responses through an online form available to members of the association. Each week, participants select one of three options regarding their expectations for the direction of the stock market over the next six months:

• Bullish – expecting the market to rise
• Bearish – expecting the market to fall
• Neutral – expecting the market to remain relatively unchanged

The results are expressed as percentages, reflecting the proportion of respondents selecting each view. For example, if 45% report a bullish outlook, 30% are bearish, and 25% are neutral, those percentages represent the sentiment breakdown for that week.

The survey does not ask participants to explain their reasoning or specify any investment decisions. It is designed to capture sentiment only, not behavior.

Interpretation and Usage

The AAII Sentiment Survey is primarily used as a contrarian indicator. The basic principle is that when a large majority of retail investors are optimistic (bullish), it may signal that the market is overbought or near a top. Conversely, when pessimism (bearish sentiment) dominates, it could suggest a buying opportunity as markets may be oversold.

Investors and analysts often look for extremes in the data rather than weekly fluctuations. For example, bullish sentiment rising well above its long-term average might raise concerns about excessive optimism, while unusually high bearish sentiment may suggest widespread fear — conditions sometimes seen before a market rebound.

It’s important to note that while the AAII Sentiment Survey is regularly cited in market commentary, it should not be used in isolation. It is most effective when combined with other technical, fundamental, or behavioral indicators. The survey reflects opinion, not action, so a high bullish reading doesn’t necessarily mean those investors are increasing their equity exposure.

Historical Trends and Limitations

Since its inception, the AAII Sentiment Survey has provided a continuous record of investor sentiment, offering valuable data for market research and historical analysis. Long-term averages for the survey tend to hover around:

• 38% bullish
• 30% neutral
• 32% bearish

These historical benchmarks serve as reference points to identify sentiment extremes. Deviations from these norms often prompt closer scrutiny from market observers.

However, the survey has notable limitations. It only includes AAII members who choose to respond, which may not represent the broader population of U.S. retail investors. The survey does not account for institutional investors or global market participants. Additionally, the results can be volatile and subject to short-term noise, especially during periods of high market uncertainty or geopolitical events.

Another criticism is that sentiment does not always translate into immediate market action. Investors might feel bearish yet still remain invested. As such, sentiment data should be contextualized with trading volume, price action, and broader economic indicators.

Applications in Market Analysis

Despite its limitations, the AAII Sentiment Survey is frequently cited in newsletters, investment research, and financial media. Analysts may overlay the sentiment data on market indices to identify possible inflection points or assess the prevailing investor mood during bull or bear markets.

The data is also useful in behavioral finance studies. It provides a longitudinal view of how investor sentiment responds to earnings seasons, policy changes, interest rate decisions, and major geopolitical developments. Over time, patterns in sentiment have helped reveal how emotions influence decision-making, even among experienced retail investors.

For traders who use technical analysis, sentiment data from the AAII survey may serve as a supplementary signal, particularly when assessing potential reversals or trend exhaustion. Portfolio managers may also monitor sentiment as part of risk management, especially when extreme optimism or pessimism could lead to herd behavior.

The Bottom Line

The AAII Sentiment Survey is a long-standing and widely followed tool for gauging how individual investors perceive the stock market’s near-term direction. While it does not predict market moves with precision, it offers meaningful insights into the mood of retail investors — which can, at times, serve as a valuable contrarian signal. Because of its accessibility, consistent format, and historical depth, it remains a relevant resource for market participants seeking to understand investor psychology.