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Mjolnir Spaceworks

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Hybrid rocket engines and weldless fuel tanks for cost-effective, mass-produced space applications

Sapporo, JapanFounded 2020Space
Valuation $50–100M Last recorded · 2026
Headcount <100 Current team size
Total funding $10–50M Disclosed equity funding
Unlock exact values This page shows ranges. Dealroom has the exact numbers for Mjolnir Spaceworks and the history behind them.

About Mjolnir Spaceworks

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.

Source: Dealroom company data

At a glance

Status
Operational
Founded
2020
Headquarters
Sapporo, Japan
Employees
17
Open positions
None listed
Dealroom signal
81.1/100
Industry
Energy, Space
Sector
Space, Space Tech, Rocketry Components, NIF defense security and resilience, NIF freedom of operations and mobility, DT and LS, science-based
Technology
Hardware, Deep Tech
Business model
Manufacturing
Client focus
b2b

Funding history

6 recorded events

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
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 ↗
Showing the latest 2 of 6 recorded eventsBook a demo for the full funding history →

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%
Summary metrics are public; monthly history is available with a demoCompare with peers →

Investments and acquisitions

Capital deployed

Recent portfolio relationships for companies that also act as investors or acquirers.

Investors

7 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Seed2 investors entered at this stage

  • UntroD Capital
  • Incubate Fund

Series A4 investors entered at this stage

  • Mitsubishi UFJ Capital
  • JIC Venture Growth Investments
  • Z Venture Capital
  • SPARX Asset Management

Series B and later1 investor entered at this stage

  • Shoko Chukin Bank
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.

Global footprint

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

Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about Mjolnir Spaceworks on X, ranked by likes and reposts, corporate channels excluded.

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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