Austrian spacetech startup Tumbleweed raises €6.9M seed round

Austrian startup Tumbleweed has raised €6.9 million in the largest spacetech seed round in the country's history. The round closed just four months after the company launched Austria's first commercial satellite.

PactVC led the financing. Vanagon Ventures, early backer Prototype Capital, EWOR and international investors and angels joined the round.

Founded in 2024, Tumbleweed operates from Vienna and Delft. It builds modular laboratory Pods hosted on its free-flying Oasis orbital platform. The Pods let researchers, manufacturers and R&D teams run experiments in microgravity without building their own space infrastructure.

How does a 'laboratory in a box' work?

CEO and co-founder Julian Rothenbuchner argues the real barrier to microgravity research is not transport but process. Preparing payloads, securing launch approval, proving safety and managing orbital operations demand specialist expertise and can add years to a project.

"For most pharmaceutical and biotechnology companies, the existing process is incredibly difficult," he said.

Tumbleweed's answer is a pre-certified, application-specific Pod. The fault-isolated container supplies power, data connectivity and orbital infrastructure. Customers install their equipment, test it in their own facilities, then hand it over for launch.

Once in orbit, each Pod works like a remote server. Its built-in computer lets researchers monitor and control experiments from the ground, similar to using a cloud provider such as AWS.

"There are significant scientific opportunities, but these applications will remain scientific curiosities unless researchers can access microgravity easily and affordably," Rothenbuchner said.

What did the first mission prove?

Oasis Alpha launched on SpaceX Transporter-17 on 7 July 2026. Tumbleweed built it in nine months, which it says is five times faster than the industry standard. The mission carried experiments for four customers, all first-time users of space. It was fully booked a year before launch and paid for upfront.

The mission showed that organisations with no space experience could run experiments in three to four months for around €30,000.

Tumbleweed's pricing now covers the entire process. Its €15,000 package includes a Pod, development support, launch services and operational support, with remote experiment access and in-mission data. Lead times run roughly two to three months, and the company is working to shorten them.

Hardware design also benefited. "When we signed our first customers, we didn't have a finalised hardware design. Instead, we told them we'd send successive prototypes and develop the system with them. That allowed us to iterate several times based on their actual requirements," Rothenbuchner said.

Who is buying?

The company reports a customer conversion rate of about 40 per cent. Around two-thirds of customers arrive through inbound enquiries. Three missions planned for 2027 are already attracting payloads from medical research, biotechnology and agritech laboratories, and the company expects to carry more than ten customers across them.

"We're moving from universities and hospitals towards national research institutes, contract research organisations and eventually much broader industrial adoption," Rothenbuchner said. "Our philosophy is to integrate microgravity into existing supply chains. For microgravity to become a major commercial market, it needs to become as unremarkable as the internet is today."

What are researchers studying?

Oasis Alpha supported materials science, including recrystallisation experiments, plus protein synthesis research. Bacteria behave differently in microgravity, and researchers are testing whether that helps produce otherwise difficult-to-manufacture proteins.

Microgravity can also serve as a disease model and may accelerate development of organoids and organs-on-chips. Their cells are often immature, and microgravity could speed maturation, cutting months from experimental timelines.

Next missions will study immune-system ageing and inflammation interventions. "One of the interesting things about microgravity is that it can accelerate certain biological changes associated with ageing," Rothenbuchner said. The company also collaborates on cardiovascular research and wound healing in space.

Can Tumbleweed secure launches?

Launch demand currently outpaces capacity. The company is in talks with providers across the US, Europe and Asia-Pacific, adapting spacecraft designs to fit available slots.

"We're not dependent on American launch providers, and we can't afford to be. We've even designed a spacecraft in a single day to take advantage of an opportunity," Rothenbuchner said. Suborbital flights can serve early-stage experiments while orbital capacity expands.

Oasis Beta, scheduled for 2028, adds re-entry capability so customers can retrieve physical samples. Tumbleweed is validating its re-entry vehicle through simulations and targeted physical testing rather than a full end-to-end test.

"What really matters is the overall experience: how easy it is to access microgravity, how quickly experiments can be conducted, how flexible the service is and how much it costs," Rothenbuchner said.

From Mars rovers to orbital labs

Rothenbuchner began building drones at around eight. At 16, he and two friends designed a wind-driven Mars rover inspired by tumbleweeds in Western films, landing on the planet at roughly one-hundredth of the conventional cost. The concept won a space competition and ESA funding, and grew into a volunteer research lab with hundreds of researchers.

"I loved the long-term vision of Mars exploration, but it wasn't particularly actionable," he said. "The traditional funding routes were simply too slow for the pace at which I wanted to build." In 2024 he brought two colleagues from that network into the new venture.

More than one-third of Tumbleweed's 25 employees have invested their own money, contributing a combined six-figure sum across every round. "The team actually asked for this from their end - we didn't ask initially," Rothenbuchner said.

Daniel Dippold, CEO of EWOR, said: "Julian has done exactly what he told us he would do when we first met him, only faster. Now every lab and manufacturer can use space without becoming a space company first."

Andreas Klinger, founder of Prototype Capital, added: "Tumbleweed completely rethinks how R&D for industry and science in space should be done. This allows rapid iteration for the next generation of space technologies."

Austrian Federal Minister Peter Hanke said: "Companies like these strengthen domestic value creation, create skilled jobs, and demonstrate that Austria is internationally competitive in demanding future technologies."

The 2028 re-entry mission will decide whether Tumbleweed can close the loop from launch to returned sample, and whether a €15,000 price tag can turn orbital research into routine industrial R&D.