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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
client focusb2btechnologyHardwaretechnologyDeep Techbusiness modelManufacturingsectorSpace TechsectorRocketry ComponentssectorNIF defense security and resiliencesectorNIF freedom of operations and mobilitysectorDT and LSsectorscience-basedindustryEnergyindustrySpace

Valuation & funding

Mjolnir Spaceworks funding history

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
DEBTDebt May 2026 $3.8M Shoko Chukin Bank
SERIES BEquity / VC May 2026 $9.2M $69M Incubate Fund · JIC Venture Growth Investments · Z Venture Capital · SPARX Asset Management
EARLY VCEquity / VC Jan 2026 $14M $55M Undisclosed
SERIES AEquity / VC Oct 2025 $3.1M $12M UntroD Capital · Mitsubishi UFJ Capital · Incubate Fund
SERIES AEquity / VC Jan 2025 $2.4M $9.5M Mitsubishi UFJ Capital · UntroD Capital · Incubate Fund
SEEDEquity / VC Jul 2023 UntroD Capital · Incubate Fund
Showing 6 recorded eventsUnlock the complete deal history →

Financials

Workforce over time

Available workforce history. Financial fields without reported data are omitted.

YearEmployees
2026 18
2025 9
Company filings, research estimates and Dealroom dataOpen the full financial model →

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.

Latest monthly visits2.4K 3-month web change-22.6% 1-year team growth+88.9%
Monthly website visits34 observations · Oct 2023–Jul 2026
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Comparisons

Mjolnir Spaceworks compared with similar companies

Dealroom’s weighted taxonomy model identifies the closest operating peers. Company identity and context stay open; selected comparison metrics preview what is available in the platform.

Showing 8 of the closest matchesCompare every metric →

Talent graph

Mjolnir Spaceworks's talent

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Team profiled 1 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 1 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Investors

7 investors on Mjolnir Spaceworks's cap table

Sourced from Dealroom's funding and investor records.

Seed 2 investors entered at this stage
UntroD Capital
Incubate Fund
Series A 4 investors entered at this stage
Mitsubishi UFJ Capital
JIC Venture Growth Investments
Z Venture Capital
SPARX Asset Management
Series B+ 1 investor entered at this stage
Shoko Chukin Bank

Global footprint

Where Mjolnir Spaceworks has talent and traffic

Workforce by country
1 countries with
team presence
🇯🇵 Japan80%
1 country shown

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.

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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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