These 10 Stocks Just Rocked The Market

Ten companies posted a sluggish performance last week, with investor sentiment weighed down by a wave of negative developments, including disappointing earnings performance, not-so-impressive study results, as well as potential share sales that sparked concerns about equity dilution.

In this article, we have identified the 10 worst-performing stocks last week and detailed the reasons behind their drop.

Our analysis focused only on companies with a trading volume of more than $ 5 million and a market capitalization of $2 billion. Rankings were based on their closing prices on May 30 and May 23, 2025.

10. D-Wave Quantum Inc. (NYSE:QBTS)

D-Wave Quantum dropped its share prices by 13 percent week-on-week as investors sold off positions amid the lack of fresh catalysts, while taking profits from last week’s gain, boosted by the launch of its new quantum computer capable of solving complex problems beyond the reach of classical computers.

Called the Advantage2, the new computer is capable of addressing real-world use cases in areas such as optimization, materials simulation, and artificial intelligence (AI).

Customers are now able to access the Advantage2 system through D-Wave Quantum Inc.’s (NYSE:QBTS) LeapTM real-time quantum cloud service, which is available in more than 40 countries and offers 99.9 percent availability and uptime, sub-second response times, and SOC 2 Type 2 compliance to meet enterprise needs and security requirements.

Additionally, last week’s performance was dampened by the company’s comment that the US was already lagging behind other countries in quantum annealing.

Quantum annealing is a specific type of quantum computing for finding optimal solutions to optimization problems by leveraging quantum phenomena such as superposition and quantum tunneling.

9. The Cooper Companies, Inc. (NASDAQ:COO)

The Cooper Companies saw its share prices decline by 13.38 percent week-on-week, with investor sentiment dampened by its weak outlook guidance and lowered ratings from three investment companies.

In its latest earnings call, The Cooper Companies, Inc. (NASDAQ:COO) said it now sees organic growth of 5 to 6 percent for fiscal year 2025, down from the 6 to 8 percent as targeted previously.

Meanwhile, JPMorgan, Wells Fargo, and Bank of America all lowered their price targets for The Cooper Companies, Inc. (NASDAQ:COO).

JPMorgan, for its part, lowered its rating to “neutral” from “overweight” and gave the firm a price target of $76, a 31-percent cut from the $110 previously.

“It’s hard to come away feeling positive following several quarters of mixed execution and a potentially durable slowdown in market trends back to previous levels,” JPMorgan said.

For its part, Wells Fargo also reduced its price target for The Cooper Companies, Inc. (NASDAQ:COO) to $93 from $118 previously, while Bank of America cut its price target to $96 from $120.