Sidus Space (SIDU) is back on investor radars after amending its agreement with Lonestar Data Holdings to supply a second StarVault orbital data storage payload, along with progress on LizzieSat-4 and its Fortis avionics system.

These contract wins and the Q1 2026 results, where the company reported revenue of US$0.36m and a narrower net loss of US$5.21m, come against a backdrop of sharp share price swings. The stock recorded a 9.56% 1 day share price return and an 84.79% 90 day share price return, as well as a very large 1 year total shareholder return. This contrasts with a 3 year total shareholder return that declined 83.63%, suggesting recent momentum has been rebuilding after a difficult longer period.

If this kind of early stage space opportunity has your attention, it can be useful to see what else is moving in related areas through 30 robotics and automation stocks

With Q1 2026 losses still sizable, a fast rising share price over the past year and a current price well below the analyst target, the key question is simple: is Sidus Space undervalued or is the market already pricing in future growth?

Price to Book of 6.4x: Is It Justified?

Sidus Space currently trades on a price to book, or P/B, ratio of 6.4x, which investors often compare against both peers and broader sector benchmarks to judge how much is being paid for each dollar of net assets.

The P/B ratio measures the company’s market value relative to its book value, essentially putting a tag on what the market is willing to pay for its equity base. For an early stage, unprofitable space business with limited revenue of about US$3.38m and a reported net loss of US$29.47m, this type of multiple tends to reflect expectations around future commercialization of technology, contract wins and eventual scale, rather than current earnings.

On one hand, Sidus appears good value versus a set of peers, with its 6.4x P/B ratio below their 13.3x average. On the other hand, it trades at a premium to the broader US Aerospace and Defense industry, where the average P/B is 3.7x. That gap suggests the market is assigning a higher valuation to Sidus equity than is typical across the industry, even though the business is still unprofitable and does not yet have what many investors would regard as meaningful revenue.

Result: Price to book of 6.4x (ABOUT RIGHT)

However, there are clear risks to consider, including ongoing net losses of US$29.47m and sharp share price swings that could quickly reverse recent momentum.

Next Steps

Curious whether the market is too optimistic or just catching up with the story here? Take a close look at the data, be ready to act quickly if needed, and make sure you understand the 4 important warning signs.

Looking for more investment ideas?

If Sidus Space has sparked your interest, do not stop here; widen your watchlist now so you do not miss other opportunities lining up.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.