Austrian clean energy company Emerald Horizon AG made history today, closing its first day of trading on the Vienna Stock Exchange (VIE: SMRX) with a market capitalisation above €1 billion, officially reaching unicorn status on the public markets.

Shares opened at €760.00 and climbed to a closing price of €1,010.00, a first-day gain of +32.89%. It marks a historic moment for Austria’s capital markets and a major milestone for the European deep tech ecosystem.

What Is Emerald Horizon?

Founded in Graz, Emerald Horizon is building the next generation of clean energy infrastructure. The company’s mission: make reliable, carbon-free energy available at scale, 24 hours a day, anywhere in the world.

Its technology portfolio spans two complementary solutions:

• DUALstore PLUS: A market-ready hybrid energy storage system combining lithium iron phosphate (LFP) batteries, molten-salt thermal storage, and AI-driven energy management. Built to solve renewable energy’s biggest problem: what happens when the sun doesn’t shine and the wind doesn’t blow.
• ADES (Accelerator-Driven Energy System): A thorium-based microreactor designed for carbon-free baseload power. Unlike conventional nuclear, ADES uses no uranium and relies on an externally controlled neutron source rather than a self-sustaining chain reaction — making it a fundamentally safer next-generation approach.

The Listing: Key Facts

Today’s admission to the Official Market of the Vienna Stock Exchange is a listing of all existing shares rather than a traditional IPO. Key details:

• Ticker: SMRX (Vienna Stock Exchange, Xetra T7)
• Opening price: €760.00
• Closing price: €1,010.00 (+32.89%)
• Market cap at close: >€1 billion
• Market makers: Baader Bank AG and Hauck & Aufhäuser Privatbankiers AG

The listing was supported by Wiener Privatbank, with Venionaire Capital serving as a supporting advisor on the company’s path to the public markets.

At the opening bell ceremony, CEO Florian Wagner, VP Operations Philipp Pölzl, and VP International Relations Robert Holzmann formally welcomed Emerald Horizon to the public markets.

Why This Matters for European Deep Tech

Emerald Horizon’s debut is more than a single company milestone. It signals that Europe’s deep tech ecosystem is maturing, producing companies capable of tackling global infrastructure challenges and attracting serious capital market interest.

Deep tech listings of this scale remain rare in Austria and across continental Europe. Today’s unicorn valuation is a reminder that transformational energy companies don’t only come from Silicon Valley or Asia. They are increasingly being built right here.

What’s Next

A stock exchange listing is not an exit, it’s an accelerant. For Emerald Horizon, going public means greater transparency, broader stakeholder access, and more flexibility to fund the next phase of development.

The road ahead is long. Breakthrough energy technologies take years to scale, and success will depend on continued engineering execution, regulatory progress, and industrial partnerships. But the foundation is in place.

We congratulate Florian Wagner, Philipp Pölzl, Robert Holzmann, and the entire Emerald Horizon team. The future of energy is being built and today, it rang the opening bell in Vienna.

Watch the Full Podcast Interview with CEO Florian Wagner

To explore these ideas in more detail, listen to our latest Let’s Talk About Tech episode featuring Florian Wagner, CEO & Founder of Emerald Horizon.