Tumbleweed Raises €6.9 Million to Make Space-Based Experiments More Accessible

Austrian spacetech startup Tumbleweed has raised €6.9 million in a seed funding round led by PactVC to expand its orbital experiment services, following the successful launch of its first commercial satellite earlier this year.

The Vienna-based company plans to use the funding to finance three additional launches in 2027, serve more than 10 customers and accelerate development of its next mission, Oasis Beta. The round also includes Vanagon Ventures, Prototype Capital, EWOR, international investors and angel investors. More than a third of Tumbleweed's 25 employees have invested their own money in the company.

The funding is being described as the largest spacetech seed round in Austrian history.

From two SpaceX rejections to a successful orbital launch

Tumbleweed was founded in 2024 by Julian Rothenbuchner, Guillaume Brault and Leonhard Goliasch, with operations split between Vienna and Delft.

The company's origins go back further. Rothenbuchner started Team Tumbleweed in 2016 as a wind-powered Mars rover project. After six co-founder changes, the initiative evolved into the current business focused on making research and industrial experimentation in space more accessible.

The team encountered challenges during the certification process for its first mission. SpaceX rejected Tumbleweed's first two certification proposals before accepting its third.

The experience highlighted a problem the company believes affects potential users of space-based research: getting access to a rocket is not necessarily the biggest obstacle. Preparing and certifying an experiment for spaceflight can take years, while payload processing can cost hundreds of thousands of dollars.

Tumbleweed is building its business around reducing that complexity.

Pre-certified Pods for experiments in orbit

The company's core product is the Pod, a pre-certified, fault-isolated container designed to carry customer experiments into orbit.

Instead of having each laboratory or manufacturer independently navigate the lengthy certification process, customers send their payloads to Tumbleweed. The company handles the spaceflight infrastructure and regulatory requirements, keeping experiments powered and connected during the mission. Customers then receive data from their experiments.

Tumbleweed says its approach can get experiments into orbit five times faster and at one-tenth the cost of a comparable International Space Station experiment.

Missions start at €15,000, giving research organisations and businesses a lower-cost entry point to microgravity experimentation.

The company's first mission, Oasis Alpha, launched on July 7 aboard SpaceX's Transporter-17 mission. The 3.6-kilogram CubeSat carried experiments from four customers:

• Delft University of Technology

• European Space Resources Innovation Centre

• The Spring Institute for Forests on the Moon

• Mass Balance

According to the company, all four were first-time users of space-based experimentation.

The mission demonstrated that Tumbleweed could get its container certified and operating in orbit. Its next challenge is to repeat the process at a larger scale and establish recurring demand from customers.

Preparing for sample return and further launches

The fresh capital will support three additional flights planned for 2027. Tumbleweed aims to serve more than 10 customers across medical research, biotechnology and agricultural technology.

The company is also accelerating development of Oasis Beta, its next mission, which is intended to bring experiments and samples back to Earth.

While an earlier statement indicated a possible launch as early as late 2027, the latest announcement places the return mission in 2028.

This capability could expand the types of experiments customers can conduct. Rather than receiving only data from experiments conducted in orbit, researchers would be able to retrieve physical samples for further analysis on Earth.

Tumbleweed sees potential applications in areas such as pharmaceutical development, cancer research and semiconductor manufacturing. These are longer-term ambitions rather than outcomes already demonstrated by the company.

Investors back a different approach to the space economy

PactVC led the €6.9 million round, with participation from Vanagon Ventures, Prototype Capital, EWOR and several international investors and angels.

The investment comes as companies across the space sector attract capital to develop in-space manufacturing, orbital research and technologies for returning materials to Earth.

Tumbleweed operates in a different part of this market from companies primarily focused on orbital manufacturing and material recovery. Its business centres on providing certified experiment containers and managing the regulatory requirements associated with sending customer payloads into orbit.

However, the company remains dependent on SpaceX for launches. It has signed a memorandum of understanding with French launcher SIRIUS Space Services to test compatibility between its Pods and the launcher's systems.

That could eventually provide another launch option, although the company has not announced a replacement for its current SpaceX dependence.

Scaling commercial demand for orbital research

Tumbleweed currently has 25 employees and plans to expand its team as it increases mission frequency. The funding will support its technical development, customer growth and upcoming launches.

The opportunity is tied to the broader development of in-space manufacturing and research. MarketsandMarkets forecasts that the in-space manufacturing market could grow to $4.6 billion by 2030 and $62.8 billion by 2040.

For Tumbleweed, the immediate test is more practical: whether its first successful mission can turn into a repeatable commercial service.

The company needs to demonstrate that it can deliver more launches, attract repeat customers and successfully return samples through Oasis Beta. Its €6.9 million funding round gives it capital to pursue those milestones, but execution will determine whether its model can compete in a space sector with significantly better-funded players.