Arverne's Power Play: Founder's Stake Hike Unlocks Major Green Investment

PAU, FRANCE – June 19, 2026 – In a move that speaks volumes about conviction, Arverne Founder and CEO Pierre Brossollet has orchestrated a significant consolidation of his control over the French geothermal leader. The company announced that Brossollet, through a holding company, is acquiring a 5.76% stake from early investors. While on the surface a simple block trade, this maneuver is the critical linchpin in a much larger strategic play: securing a landmark investment from RGREEN INVEST, a major force in European green finance. The transaction isn't just about shares changing hands; it's a carefully structured realignment of capital and control designed to fuel Arverne's next chapter of growth in France’s energy transition.

The Story Behind the Stake

At the heart of this development is a founder doubling down. Pierre Brossollet’s acquisition of shares from long-standing backers Alhia Green and Langa International at €4.00 per share is more than a symbolic gesture. It is a mandatory condition precedent for a far more substantial capital infusion from RGREEN INVEST's INFRAGREEN V fund. The mechanics are telling: Brossollet, via his family holding company Arosco, will contribute his shares into a new vehicle, Geogreen, which executed the buy-out. He will maintain majority control of Geogreen, effectively cementing his position as the reference shareholder while creating the very structure that will welcome RGREEN as a strategic partner.

This reinforcement of a founder-led model carries both immense potential and classic governance questions. Proponents will argue that a founder with more skin in the game ensures a steadfast, long-term vision, shielding the company from the whims of short-term market pressures. Brossollet's vision is clear: to unlock what he calls France's subterranean "treasure" of geothermal heat and lithium, positioning Arverne at the vanguard of national energy sovereignty. His public statements consistently champion the need to accelerate deployment and overcome bureaucratic hurdles.

However, concentrated power can be a double-edged sword, often raising concerns about board independence and management accountability. Arverne's board structure, with three independent directors out of eight, will be under scrutiny to provide robust oversight. The incoming partnership with RGREEN INVEST may serve as a crucial balancing force. The memorandum of understanding provides for RGREEN to appoint a director to Arverne's board to represent Geogreen, introducing a new, powerful voice with a vested interest in both financial returns and verifiable environmental performance.

In the press release, Brossollet was quick to acknowledge the role of the exiting investors. “I would like to warmly thank Gilles Lebreux, through Alhia Green and Langa International, for his trust and commitment alongside Arverne,” he stated. “His strategic vision and his support during the early stages were instrumental in structuring the Group and bringing our ambitions to life.”

A Strategic Infusion of Green Capital

The transaction's true significance lies in the capital it unlocks. RGREEN INVEST is not a minor player. The Paris-based firm manages over €3.4 billion in assets dedicated to the energy transition. Its INFRAGREEN V fund, which closed with over €900 million in March, is an Article 9 fund under SFDR regulations, the highest classification for sustainable investment. This means its capital is directed at projects with clear environmental objectives, aligning perfectly with Arverne's mission.

The full deal, expected to close by July 17, 2026, will see a total of €70 million injected into Arverne's ecosystem. Geogreen, now the joint holding company of Brossollet and RGREEN INVEST, will lead the charge by subscribing to €37 million in a planned bond issuance (ORANE). This investment complements commitments from a roster of significant French institutional investors, including Bpifrance, ADEME Investissement, and Crédit Mutuel Equity, creating a formidable financial base for Arverne's ambitious plans.

This influx of capital is earmarked for Arverne's "Dual Flow" strategy, a two-pronged approach targeting both geothermal heat and the extraction of lithium, a critical component for electric vehicle batteries. For a company like Arverne, which operates in a capital-intensive industry requiring massive upfront investment in exploration and drilling, this financing is not just beneficial—it's essential.

Passing the Baton in the Energy Transition

The departure of Alhia Green and Langa International is framed not as a retreat, but as a "successful completion of an investment cycle." This narrative aligns with established trends in the renewable energy sector, where early-stage venture and private equity investors often pave the way for larger, infrastructure-focused funds as a company matures. The median time to exit for climate tech companies hovers around nine years, and M&A or strategic sales are the dominant exit route. Langa International's own recent successful financing round, which notably included RGREEN INVEST, underscores that its exit from Arverne is a strategic reallocation of capital after a fruitful partnership.

These early investors backed Arverne from its inception, providing the crucial risk capital and strategic guidance needed to navigate its formative years. Their successful exit now makes way for a new phase of institutional investment better suited to funding large-scale project deployment, demonstrating a healthy and functioning capital market for green technologies in France.

Tapping France's Subterranean Treasure

With its governance consolidated and finances secured, Arverne is poised to capitalize on a burgeoning market. France is Europe's second-largest producer of deep geothermal heat, but the potential is far from fully tapped. The French government is aggressively pushing for expansion, with a Multiannual Energy Plan targeting a near-doubling of production by 2028. Arverne, as the only fully integrated geothermal player in France, is in a prime position to capture a significant share of this growth.

The company's other major bet is on geothermal lithium. Its Lithium de France subsidiary is developing an innovative Direct Lithium Extraction (DLE) technology in Alsace, aiming to produce 27,000 tonnes of lithium carbonate annually by 2031. This would be a game-changer for European supply chains, potentially satisfying 15% of the continent's projected demand for EV batteries and reducing reliance on imports. Analyst consensus for Arverne's stock is a "Strong Buy," with a price target of €8.70, reflecting market optimism in its dual-revenue strategy.

Despite reporting a loss of €20.71 million on revenues of €17.96 million in 2025, the company's financial health is robust, with a net cash position of over €41 million at year-end and projections for strong business volume growth. With its leadership consolidated and its war chest replenished, Arverne is now positioned to drill deeper into France's energy future, betting that the nation's greatest resource lies directly beneath its feet.