Top S&P 500 Stocks of 2026 Face Uncertain Future as Investors Weigh Risks

The top three performing stocks on the S&P 500 in 2026, Sandisk (NASDAQ:SNDK), Moderna (NASDAQ:MRNA), and Dell Technologies (NYSE:DELL), have seen remarkable gains this year, leaving investors to question whether it’s time to cash out.

Sandisk has surged around 600%, driven by high demand for its memory products and AI infrastructure upgrades. Analysts note that the stock is trading at eight times its estimated future profits, suggesting potential for further growth if the shortage continues. However, investors may consider selling part of their position to mitigate risk.

Moderna’s stock has soared approximately 550% after positive trial data for a cancer vaccine developed with Merck. While the rally seems justified, some caution that the treatment’s approval and long-term growth may not sustain such high valuations, recommending a sell before a potential correction.

Dell Technologies has seen its shares rise over 350%, benefiting from soaring demand for AI servers and tech infrastructure. With strong financial performance and a price-to-earnings ratio of 21, the stock may continue rising as long as tech companies invest in AI. However, investors are advised to trim positions to protect against potential slowdowns in spending.