10 Worst Performing Defense Stocks So Far in 2025

2. Sidus Space, Inc. (NASDAQ:SIDU)

YTD Decline in Share Price: -66.33%

Sidus Space, Inc. (NASDAQ:SIDU) is engaged in the design, manufacture, launch, and data collection of satellites. It serves the aerospace, commercial space, and defense industries. With a year-to-date share price decline of 66.33%, it is among the worst performing stocks in 2025.

Weak financial performance is one of the major drivers of the slump. The company reported losses during the first three quarters of the fiscal 2024. Investors also remain concerned about Sidus Space, Inc. (NASDAQ:SIDU)’s weak gross profit margins, which stood at just 2% during the third quarter. The company is scheduled to report Q4 and full year 2024 results on March 31.

This week, Sidus Space, Inc. (NASDAQ:SIDU) announced receiving a new purchase order from a leading Asian research and development firm. The agreement marks the company’s entry into the region and will help showcase its capabilities through the Orlaith ecosystem. The initiative also highlights SIDU’s leadership in real-time data analytics and orbit computing.

On March 17, Sidus Space, Inc. (NASDAQ:SIDU) announced the successful launch and deployment of LizzieSat (LS-3) into Low Earth Orbit. It was launched on March 14 as part of the Transporter-13 rideshare mission with SpaceX. This was the company’s third satellite launch within a year, after LizzieSat-1 and 2, which have been in orbit since March and December 2024, respectively. The stock surged briefly after the news, before falling again in the days that followed.