Vienna, March 2026 – zerothird today announces the successful closing of its Seed+ funding round, marking a significant milestone in the company’s growth trajectory.
The Seed+ funding round was led by VERBUND X Ventures as the lead investor, with continued support from Sparring Capital Partners and participation from KGAL GmbH & Co. KG as well as other existing investors. This bridge financing enables zerothird to position itself at the forefront of European QKD certification initiatives even before the Series A round.
More than half of this round is being carried by existing investors, underlining strong confidence in zerothird’s team, execution, and progress.
Beyond capital, the entry of VERBUND X Ventures, the corporate venture capital unit of VERBUND, Austria’s leading energy company, highlights a clear shift: quantum-secure communication is moving from research into operational relevance for critical infrastructure.
This shift is not limited to the energy sector. Across industries such as finance, healthcare, and public infrastructure, secure communication is becoming an immediate priority.
The funding enables zerothird to accelerate this transition by leading Europe’s QKD certification initatives, further scaling zerothird's systems in operational environments and expanding deployments with strategic partners.
zerothird is building on strong momentum, including long-term testing collaborations with partners such as Erste Group Bank AG and contributions to European initiatives like the EU project QUAPITAL, working toward a quantum-secure communication link between Vienna and Frankfurt.
These developments reinforce a clear direction: bringing quantum-secure communication into real-world infrastructure and making it reliably deployable where it matters most.
