When You Buy the Hype, Insiders Love to Sell

It is well established by empirical research that company insiders realize significant abnormal profits by trading their own company’s stock.

Sattar Mansi, Lin Peng, Jianping Qi, and Han Shi, authors of the study "Investor Attention and Insider Trading," published in the August 2025 issue of the Journal of Financial and Quantitative Analysis, investigated a novel connection between retail investor attention and insider trading patterns. Their study was motivated by studies (for example, here and here) demonstrating that heightened retail investor attention leads to excessive net buying, which in turn triggers a temporary stock price increase that subsequently reverts.

They hypothesized that company insiders trade the company’s stocks to take advantage of the mispricing generated by retail investors. Their findings expose how insiders strategically time their trades around periods of heightened or diminished retail investor attention, creating a previously unidentified form of opportunistic trading behavior.

What the Authors Examined

The authors analyzed insider trading data alongside various measures of retail investor attention, examining how corporate insiders adjust their trading strategies based on the level of public attention their company’s stock receives. They specifically focused on periods when retail investors are either highly focused on particular stocks or when attention wanes. Their measure of investor attention is the Google Trends search volume index. Their data sample comprises all common stocks traded on the New York Stock Exchange, Amex, Nasdaq, and Arca exchanges for the period of July 2004 through December 2021.

The study paid particular attention to:

• “Lottery-type” stocks—typically high-volatility, speculative stocks that attract retail investors
• Firms with substantial retail ownership
• Seasoned equity issuances and their timing relative to attention cycles
• Robinhood-herding episodes as modern examples of attention-driven trading

The Attention-Trading Pattern

The authors’ key findings were:

• Insiders are more likely to sell their company’s stock during periods of heightened retail attention and more inclined to buy when attention diminishes. Insiders aren’t just trading on fundamental information about their companies but are also exploiting predictable patterns in retail investor behavior.
• When conditioned on retail attention, insider trades exhibit return characteristics that are distinctly different from those associated with conventional insider trading, featuring significantly higher returns. Risk-adjusted alphas ranged from 115.4 to 136.7 basis points per month for the value-weighted portfolios, substantially higher than the 73.2 to 89.7 basis points level for the unconditional strategy. However, the higher returns were more transient.
• Rising retail attention is associated with significant increases in both the likelihood and size of insider sales. In contrast, retail attention significantly reduces the likelihood and size of insider purchases.
• The returns to the attention-based strategy peak at the one-month horizon and dissipate within 12 months—a finding different from trading based on material insider information about firm fundamentals analyzed in previous studies.

Enhanced Effects in Specific Market Segments

The results were particularly pronounced for lottery-type stocks (prices in the bottom half of the distribution and idiosyncratic volatility and skewness in the top half of the distribution) and for firms with substantial retail ownership. The attention-trading relationship is the strongest in market segments where retail investors are most active and prone to attention-driven decision-making—a pattern consistent with the evidence that high retail attention tends to be associated with overvaluation. They also found that attention-based insider trading is less likely to result in Securities and Exchange Commission enforcement actions and persists across different regulatory regimes.

Connection to Market Inefficiencies

The findings relate to indicators of mispricing, retail order imbalances, and Robinhood-herding episodes (Robinhood users are more inclined to engage in attention-driven buying and to herd into certain stocks, compared with other retail investors), and they extend to seasoned equity issuances. Together, the evidence suggests that insiders take advantage of attention-driven mispricing by trading on their own accounts and their firm by timing its seasoned equity issuances. (Firms are more likely to conduct seasoned equity offerings after periods of high retail attention.) The phenomenon isn’t limited to routine insider trading as it extends to major corporate events and broader market inefficiencies.

Key Takeaways for Investors

Stocks that are generating significant retail attention—whether on social media, investment forums, or trading platforms like Robinhood—may be experiencing attention-driven mispricing rather than fundamental value increases. Thus, if you’re considering buying during periods of high attention or “hype,” recognize that insiders may be doing the opposite—selling into the enthusiasm. And don’t rely solely on social media or retail-focused platforms for investment decisions.

The research by Mansi, Peng, Qi, and Shi reveals a sophisticated layer of market dynamics that individual investors need to understand: Social media and retail trading platforms can quickly amplify attention on particular stocks, and corporate insiders aren’t just trading on fundamental information—they’re strategically exploiting predictable patterns in retail investor attention to maximize their profits.

The key insight isn’t that insiders make profitable trades—we’ve known that for decades. Rather, it’s that insiders have evolved sophisticated timing strategies that exploit the very attention mechanisms that drive much of retail investor behavior. By recognizing these patterns, individual investors can make more informed decisions and avoid falling into the trap of attention-driven mispricing.