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Tachyons Ventures
Tachyons Ventures is a European deep-tech venture firm founded by ex-DeepMind engineer Alexsis de Raadt-St.
Tachyons Ventures
Tachyons Ventures was founded in 2019 by Alexsis de Raadt-St. James, a former DeepMind engineer who structured the firm around a thesis that European deeptech is underserved at the earliest stage. The firm maintains offices in Manchester, Menlo Park, Esztergom, and Cambridge. Tachyons targets pre-seed and seed investments across AI/ML, climate tech, enterprise software, and hardtech. Check sizes typically range from £500,000 to £2 million. The firm takes an active engineering role, embedding its team of technical venture partners to assist with proof-of-concept and prototype development. Known portfolio companies include OMNIVORE, a procurement platform for recycled plastics, and RoboK, a middleware for robotic systems. Deployment pace appears modest; the firm has not publicly disclosed total AUM or fund size. As of early 2025, it lists fewer than 15 known portfolio companies on its public materials. The team is lean—the founding GP is supported by three venture partners, including Adam Borsodi, who focuses on computing and technical diligence. What distinguishes Tachyons from a conventional venture firm is its engineer-in-residence model, a structure more common in corporate R&D labs than in early-stage funds. The firm employs full-time engineers who work alongside founding teams during the first year post-investment, reducing technical execution risk. This model also feeds deal flow—many prospects arise from the technical partners' own networks and prior co-working relationships.
General information
Firm type
Venture Capital
Year founded
2019
AUM
Undisclosed
Location
Region
Europe
Country
United Kingdom
City
Manchester
Corporate office
Manchester, United Kingdom
Additional offices
Menlo Park, California, United States · Esztergom, Hungary · Cambridge, United Kingdom
Principals
Alexsis de Raadt-St. James
Founder and General Partner
Adam Borsodi
Venture Partner
Sector focus
Frequently asked questions
Who runs investment decisions at Tachyons Ventures?
Founder and General Partner Alexsis de Raadt-St. James makes the final investment calls. De Raadt-St. James came from DeepMind and previously founded a machine learning startup. She is supported by a small team of venture partners, including Adam Borsodi, who provides technical and computing diligence.
What investment stages does Tachyons Ventures typically target?
Tachyons focuses on pre-seed and seed rounds, writing checks in the range of £500,000 to £2 million. The firm does not typically lead later-stage or growth rounds, though it may participate in follow-ons for existing portfolio companies.
How does Tachyons source proprietary deal flow?
The firm's engineer-in-residence program generates many of its proprietary opportunities. The in-house engineers work directly with technical founders, often before a formal fundraise, providing hands-on development support. This creates a pipeline of early deals that may not yet be marketed to broader VC syndicates.
Does Tachyons Ventures participate in fund commitments or only direct deals?
Tachyons appears to operate exclusively as a direct investor. It has not disclosed any fund-of-funds or secondary market activity. All capital seems to be deployed into direct equity stakes in early-stage companies.
Which sectors does Tachyons Ventures explicitly avoid?
The firm does not invest in pure financial services, crypto, or consumer internet. Its focus is limited to deep-tech verticals where a technical co-building model adds value: AI/ML, climate technology, enterprise software, and hardtech.
What is the engineer-in-residence model, and how does it differ from a typical venture firm?
Tachyons employs full-time engineers who are embedded in portfolio companies for up to 12 months after investment. The engineers work on product and technical challenges alongside the founding team. This is designed to reduce the risk of early technical failure—a model that is closer to corporate R&D than to standard VC practice.
Where does the underlying wealth come from?
The ultimate source of Tachyons's capital is not publicly disclosed. The firm does not appear on any family-office registry, and its GP has not attributed the fund to a specific family, institution, or endowment.
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