US retail investors – the most reliable force buying the dip in the US stock market over the past few years – are sending a signal that has the market on alert.
According to Bloomberg, citing Vanda Research data, retail investors recorded their first single-day net sale since November 2023 on Monday, selling a total of approximately $20.6 million in individual stocks.
Concurrently, Citadel Securities' metric for retail risk appetite has significantly declined from its February peak, indicating that individual investors' confidence in the stock market outlook is wavering. Although retail investors returned to the buying side on Tuesday, the timing of this signal is sensitive, with the S&amp;P 500 index having already fallen nearly 5% this month.
The cooling of retail buying adds another layer of concern to the market. In the bull market of the past three years, the purchasing power of retail investors played a stabilizing role in every fluctuation. Now that this force is beginning to loosen, its impact on the already pressured US stock market cannot be underestimated.
<h2>First Net Sale, Signal More Significant Than Scale</h2>
Vanda Research data shows that retail investors had a net sale of approximately $20.6 million in individual stocks on Monday, marking the first single-day net sale since November 2023. This shift occurred against the backdrop of the S&amp;P 500 index's rebound that day – at a time when Trump's threat to bomb Iran's energy infrastructure subsided, leading to a brief recovery in market sentiment.
Although retail investors returned to net buying on Tuesday, with a total purchase of approximately $262.3 million in stocks as of 12:50 PM EST, this brief 'defection' itself carries signal significance. Ruta Prieskienyte, a macro strategist at Vanda, wrote in a report released on Tuesday: &#34;Retail participation has been gradually declining since early March, accompanied by ongoing systemic deleveraging, while buying from the long side and hedge fund counterparties has been only moderate.&#34;
In addition to the net sale data, broader sentiment indicators also point to a decline in retail confidence. The metric tracked by Citadel Securities for retail risk appetite has significantly fallen from its February peak, suggesting a systematic contraction in individual investors' optimistic expectations for the stock market.
Vanda Research points out that the ongoing stalemate in the Middle East is a significant background factor for the continued weakness in retail demand. As geopolitical uncertainties drag down market sentiment, retail investors' willingness to increase positions on dips has clearly weakened, a stark contrast to their previous behavior of actively entering the market whenever there was a pullback.
The marginal change in retail investor power is noteworthy due to the substantial increase in this group's influence on Wall Street. According to JPMorgan data, individual investors set a record for the highest annual net inflow in 2025, nearly double the average of the past five years, 17% higher than the previous record in 2021, and nearly 60% higher than the level in 2024.
It is precisely this sustained and large-scale buying power that has provided significant support to the market during multiple volatility periods in the past three-year bull market. Now, as signs of cooling retail enthusiasm emerge, whether the market can continue to receive this buffer during periods of volatility has become a variable that investors need to re-evaluate.

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The most reliable 'market support force' for US stocks is beginning to waver. According to Vanda Research, retail investors recorded their first single-day net sale since November 2023 on Monday, selling approximately $20.6 million in individual stocks. This shift occurred precisely as the S&P 500 was rebounding, with markets experiencing a brief sentiment recovery after Trump's threat to bomb Iran's energy infrastructure subsided

- Retail investors in the U.S. have issued warning signals amidst a cooling market, recording their first net sell-off since November 2023, totaling approximately $20.6 million.  
- A notable decline in risk appetite among retail investors is indicated by Citadel Securities, with participation decreasing since early March.  
- The weakening demand from retail investors, influenced by geopolitical uncertainties, raises concerns about their diminishing role as market stabilizers during periods of volatility.

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Even the Most Resilient Bulls Can't Hold On? Retail Investors "Sell Off" US Stocks for the First Time Since Late 2023