A new wave of retail investor optimism could actually spell trouble for the financial markets. Analysts are warning that last week’s aggressive buying spree, following a sharp sell-off on Wall Street, may be a sign that volatility is about to return.

Last Friday, the Dow Jones Industrial Average tumbled nearly 900 points, one of the biggest single-day drops this quarter. But instead of retreating, retail investors—many using online platforms like Robinhood—rushed to buy stocks at a discount. According to market data compiled by financial analyst Joseph Adinolfi, small investors poured into the market with the largest buying volume since January 2021, when the so-called meme-stock frenzy sent GameStop shares skyrocketing.

Experts, however, say this behavior might be a bearish signal rather than a positive one. Under contrarian investment theory, markets often peak when investors become overly confident—viewing every dip as a buying opportunity—and hit bottom when fear dominates and selling takes over.

Renowned economist Robert Shiller of Yale University has been tracking this kind of sentiment through his Buy-on-Dips Confidence Index, which measures how likely investors believe markets will rebound after major losses. Historical data shows that high confidence readings often precede weaker future performance in the S&P 500, while lower confidence tends to predict stronger rebounds.

Although Shiller’s index updates with a slight delay, analysts say the record enthusiasm seen last week may signal excessive optimism—and possible turbulence ahead.

Further evidence comes from a recent study on Robinhood traders, titled “Attention Induced Trading and Returns.” The report found that stocks most heavily bought by retail investors on any given day tend to underperform the broader market by about 5% over the following month.

While not every surge in retail buying leads to a crash, market historians note that such exuberance often occurs in the final stages of a bull market—when optimism runs high, and risk quietly builds beneath the surface.

And as legendary investor Warren Buffett famously advised: “Be fearful when others are greedy.” With retail investors showing near-record greed, some analysts fear the next major correction may be closer than many expect.

For now, the markets remain on edge, as Wall Street braces for what could be another volatile week of trading.

Reporting by Noko David