10 Stocks Lost This Big While Wall Street Celebrates

Ten stocks fell sharply on Monday, defying broader market optimism, as investors fled their shares to shift to stocks benefiting from the artificial intelligence boom.

Meanwhile, Wall Street’s main indices all finished in the green, led by tech-heavy Nasdaq with 0.70 percent, followed by the S&P 500 with a 0.44 percent gain, the the Dow Jones, inching up by 01.14 percent.

In this article, we name the 10 worst-performing mid-cap companies on Monday and break down the reasons behind their lagging performance.

To come up with the list, we focused exclusively on stocks with a $2 billion market capitalization and 5 million shares in trading volume.

Stock market data on a laptop screen. Photo by Alesia Kozik on Pexels

10. Celsius Holdings, Inc. (NASDAQ:CELH)

Shares of Celsius Holdings dropped for a third consecutive day on Monday, shedding 6.19 percent to close at $51.34 apiece as investor funds fled to artificial intelligence stocks amid new developments in the booming sector.

Additionally, Celsius Holdings, Inc. (NASDAQ:CELH) lacked fresh catalysts to bolster investing appetite during the session.

Despite the decline, Celsius Holdings, Inc. (NASDAQ:CELH) currently holds positive ratings from investment companies, with Zacks Research currently at a “strong buy” recommendation for its stock.

According to Zacks, it expects the company to post year-on-year growth in 2025 and 2026 earnings by 54.3 percent and 28.6 percent, respectively, as early signs suggest that its series of product launches is doing well.

Performance data from Zacks in the second quarter showed that flavor innovation is beginning to translate into repeat activity for the company.

“Variety packs and fresh flavors helped Celsius secure the number one spot among ready-to-drink (RTD) energy brands on Amazon during Prime Day, reaching an 18.4% one-week share. This kind of momentum reflects not just initial trial but strong consumer pull, with retailers reordering top sellers and featuring them during promotional periods,” Zacks said.

“Flavor innovation is not only widening [Celsius Holdings, Inc. (NASDAQ:CELH)] brand reach but also reinforcing habits, giving consumers more reasons to return to the brand rather than just try it once,” it noted.

9. NIO Inc. (NYSE:NIO)

NIO saw its share prices decline by 6.24 percent on Monday as investor sentiment was dampened by news that strong demand for a newly launched vehicle has resulted in a six-month delivery delay.

On Saturday, NIO Inc. (NYSE:NIO) officially launched the six- and seven-seater ES8 vehicle in Hangzhou, where it sold out this year’s 40,000 unit production capacity.

Amid the strong demand, NIO Inc. (NYSE:NIO) updated reservation holders on Monday that new orders would face a waiting time of 24 to 26 weeks, which means that buyers would be able to receive their vehicles as early as March 2026, or six months from now.

Buyers will be able to receive updates about the delivery of their vehicles in the Nio app. In the meantime, customers waiting for deliveries will receive “peace of mind waiting points”  equivalent to 500 points per day from the 57th day after order lock-in until successful delivery.

Last month, NIO Inc. (NYSE:NIO) announced that it delivered 31,305 vehicles, consisting of 10,525 from the Nio brand; 16,434 vehicles from Onvo; and 4,346 vehicles from Firefly.

August delivery figures were higher by 48.9 percent than the 21,207 total deliveries in July.