Constructor Start, the equity-free global accelerator, designed by Constructor Capital and run in partnership with Constructor University and Nexford University, announced the 40 startups selected for its fourth batch, selected from 2100 applications across 70 countries.

The 2026 cohort spans Software, AI, DeepTech, and EdTech, with a notable concentration in frontier hardware: three startups are working directly on quantum technologies, and more than fifteen are building deep-tech products across health, energy, space, and physical AI — areas where Constructor’s combination of university research labs, technical mentorship, and patient capital is designed to support teams that pure-software accelerators are not equipped for.

The batch runs through two milestone events: an online pre-Demo Day pitch event called “Snowball” on July 3, 2026, a new format where each of the startups gets exactly one minute to pitch a panel of more than 40 investors, and in person Demo Day in Bremen in September, where the top 15 teams will pitch live on stage in front of 200+ attendees, including tier-1 international VCs and business leaders.

Quantum in focus

Three Batch 4 teams are working at different layers of the quantum stack:

• Memstera has reached TRL3 on a programmable quantum memory architecture and is part of an FPGA development consortium, with a roadmap toward a 4×4 memory array at TRL4 in 2026–2027 and a 128×128 prototype at TRL5 by 2028–2029.
• Pixel Photonics is developing a wafer-scale superconducting single-photon-detection platform, a foundational component for scalable photonic quantum systems.
• Query Machines is going up the stack with quantum-AI models and architectures for advanced reasoning, ahead of a planned pay-per-token reasoning API.

The quantum cluster follows the February 2026 Demo Day, where Swiss quantum startup Qendra took home one of three $100,000 prizes.

Deep tech across health, energy, space, and physical AI

Beyond quantum, the deep-tech cohort spans several frontiers:

• Health and life sciences: ARTSKIN (a neurointerface giving prosthetic users touch, pressure, depth, and temperature feedback), FerroptoCure (a first-in-class oral anti-cancer candidate targeting the xCT and ALDH pathways), Cytokyn M (a next-generation IL-1 receptor antagonist for Long COVID and inflammaging), Formyra (programmable vaterite calcium-carbonate carriers for controlled release of active ingredients), PolaSight (60-second label-free intraoperative tissue imaging using optical polarimetry), and Kinaxion (AI functional diagnostics combining smart insoles and smartphone video).
• Energy and industrial: Neology (an ammonia-based clean power generator and hydrogen cracker for off-grid and backup power) and Roboblast (a plug-and-play autonomous robotic blasting and surface-preparation system for SMEs).
• Space and defense: Spaceborne (a ground-powered microwave thermal rocket concept with nearer-term satellite-thruster revenue), SatEx (CubeSat buses and a virtual development platform for satellite subsystems), LongLink (a trusted UAV communications backbone for FPV and institutional deployments), and Ethery Tech (mission-critical wireless for infrastructure and UAV).
• Physical AI: Softionics (vision-free near-field sensing for robotics, XR, and in-car interfaces), Splatica (a pipeline turning consumer video into robot-ready structured 3D environments), and Mirai Tech (self-powered AI smart insoles for elite-sport biomechanics).

Program structure and Demo Day

Batch 4 participants will receive eight weeks of structured curriculum and mentorship covering customer discovery, market and competitive analysis, founders and team, tech and product roadmap, financial modeling, IP and legal, fundraising, and go-to-market — plus extra workshops on storytelling and pitch preparation.

Each team is paired with mentors from a network of more than 30 global tech and business experts, including Fadl Al Tarzi (founder and CEO of Nexford University), Patrick Pulvermueller (former CEO of Acronis and tech investor), Tim Akgül (Head of Technology Prototyping, AI & Automation at Deutsche Telekom), Nikita Nathan Hartschenberg (Startup Investor Manager at AWS), and Fabian Fejes Lundborg (Business Development & Innovation Officer at EIT Manufacturing).

The program is fully equity-free during participation. Three Demo Day winners are eligible for an initial $100,000 check from Constructor Capital and up to $1M in total follow-on investment.

“Selecting these teams from over 2,100 global applications proves that Europe’s deep-tech pipeline is stronger than ever. Teams building quantum memories, neurointerfaces, ammonia power generators, and microwave-thermal propulsion need a different kind of support than a pure-software startup — they require a direct bridge from the lab to commercial scale. Constructor’s combination of university infrastructure, specialized mentors, and patient capital is built exactly for that.

With a $100k prize on the line for the winner, we are excited to accelerate these founders through September and beyond,’’ said Dmitry Kurin, CEO of Constructor Start.

Success Stories

Across the first three batches of Constructor Start, alumni include Norwegian AR startup Ludenso, the 2024 Demo Day winner, which has since reached breakeven on 10x revenue growth; Israeli MedTech startup Kudu, the 2025 Demo Day winner; and February 2026 Demo Day winners Qendra (quantum, Switzerland), CellKinetica (IVF scoring), and MetaNeural (industry simulation). Demo Day participants from the 2025 program have raised more than $10M in follow-on funding over six months.

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