M
Mjolnir Spaceworks
Space · Sapporo, Japan · Founded 2020
Hybrid rocket engines and weldless fuel tanks for cost-effective, mass-produced space applications MoreLess
Mjolnir Spaceworks specializes in the development of hybrid rocket engines and weldless fuel tanks, targeting the space industry. The company operates in the aerospace sector, focusing on creating cost-effective solutions for satellite and launch vehicle components. By utilizing a combustion method that combines solid plastic fuel with liquid oxidizer, their hybrid rocket engines offer a simpler structure compared to conventional engines, significantly reducing costs and enabling mass production. The plastic fuel is made from readily available materials, minimizing the risk of explosion. Additionally, Mjolnir Spaceworks produces weldless fuel tanks, which avoid the common issues associated with welded joints, such as loss of strength and defects. This innovation ensures stable quality and shorter delivery times, addressing a critical need in the space industry. The business model revolves around manufacturing and supplying these components to aerospace companies, generating revenue through sales of their proprietary technology. Mjolnir Spaceworks serves clients in the private space sector, aiming to enhance the efficiency and reliability of space missions. Keywords: hybrid rocket engines, weldless fuel tanks, aerospace, cost-effective, mass production, space industry, satellite components, launch vehicles, private sector, combustion method.
Company overview
Mjolnir Spaceworks company information
The essential company record, classifications and operating signals in one place.
- Status
- Operational
- Founded
- 2020
- Headquarters
- Sapporo, Japan
- Employees
- 17
- Open positions
- None listed
- Dealroom signal
- 81.1
Valuation & funding
Mjolnir Spaceworks funding history
Company financing events and reported valuations.
| Deal type | Date | Amount | Valuation | Investors | Source |
|---|---|---|---|---|---|
| DEBT✓Debt | May 2026 | $3.8M | — | Shoko Chukin Bank | ↗ |
| SERIES B✓Equity / VC | May 2026 | $9.2M | $69M | Incubate Fund · JIC Venture Growth Investments · Z Venture Capital · SPARX Asset Management | ↗ |
| EARLY VC✓Equity / VC | Jan 2026 | $14M | $55M | Undisclosed | ↗ |
| SERIES A✓Equity / VC | Oct 2025 | $3.1M | $12M | UntroD Capital · Mitsubishi UFJ Capital · Incubate Fund | ↗ |
| SERIES A✓Equity / VC | Jan 2025 | $2.4M | $9.5M | Mitsubishi UFJ Capital · UntroD Capital · Incubate Fund | ↗ |
| SEEDEquity / VC | Jul 2023 | UntroD Capital · Incubate Fund | — |
Financials
Workforce over time
Available workforce history. Financial fields without reported data are omitted.
| Year | Employees |
|---|---|
| 2026 | 18 |
| 2025 | 9 |
Growth signals
Mjolnir Spaceworks website traffic
Latest recorded traffic for Mjolnir Spaceworks is 2.4K monthly website visits, down 22.6% over the last three months. Mjolnir Spaceworks's team grew 88.9% over the past year.
Comparisons
Mjolnir Spaceworks compared with similar companies
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Talent graph
Mjolnir Spaceworks's talent
Source: Dealroom Talent Intelligence.
Investors
7 investors on Mjolnir Spaceworks's cap table
Sourced from Dealroom's funding and investor records.







Global footprint
Where Mjolnir Spaceworks has talent and traffic
team presence
In the news
Latest news about Mjolnir Spaceworks
Recent press, funding announcements, and product moves mentioning Mjolnir Spaceworks — open to read from the original sources.
Market sentiment
What the market is saying about Mjolnir Spaceworks
An AI-synthesized read of the highest-engagement posts about Mjolnir Spaceworks on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.
Reading the room on X — pulling top posts and synthesizing themes…
Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour
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