About Calderion
Calderion is a venture capital firm located in Paris, France. As of Jun 2026, Calderion is an active investor, having invested in 6 companies, with 4 new investments in the last 12 months. It primarily invests in Series A round in France based startups. Its investments are spread across a wide range of sectors from Environment Tech to Energy Tech and High Tech. Most recently it participated in the $***** Series B round of H2SITE A lot of funds co-invest with Calderion, with names like Bpifrance sharing a substantial percentage of its portfolio. Calderion has team of 4 people including 3 partners.Key Metrics
Calderion's List of Top Investments
Calderion has a portfolio of 6 companies. Their most notable investments include H2SITE and Mantle8.Their portfolio spans across France, Germany, Spain and 1 more locations. They have invested in Environment Tech, Energy Tech, High Tech and 3 other sectors, across stages such as Series A, Series B and 1 more. Here is the list of top investments by Calderion:
1. H2SITE
Developer of membrane reactor technology for hydrogen separation and purification. The company’s technology facilitates hydrogen extraction from various sources, including ammonia, methanol, and syngas. It also filters hydrogen mixed with other gases in storage infrastructure. The membrane reactors enable hydrogen absorption with high purity and conversion efficiency.
Key facts about H2SITE
- Founded Year: 2019
- Location: Biscay (Spain)
- Stage: Series B
- Total Funding till date: $54.2M
- Employee Count: 77 as on Aug 31, 2026
- Investors: Engie, MassMutual Ventures and 15 Others
- Latest Funding Round: Series B, Sep 22, 2026, $*****
- Highlight: Editors' Pick
2. Mantle8
Developer of natural hydrogen exploration technology. It uses proprietary multiphysics imaging and geological data analysis to identify and assess subsurface natural hydrogen reserves. The company's technology is scalable and applicable globally. Its services encompass prospect generation, permitting, and exploration campaign management. The team comprises experienced geoscientists and engineers.
Key facts about Mantle8
- Founded Year: 2024
- Location: Sassenage (France)
- Stage: Series A
- Total Funding till date: $44M
- Employee Count: 35 as on Aug 31, 2026
- Investors: Gates, Breakthrough Energy and 7 Others
- Latest Funding Round: Series A, May 13, 2026, $*****
- Highlight: Editors' Pick
3. Mitico
Provider of carbon capture technology for industrial emissions. It is an accessible solution to mitigate the impact industrial carbon emissions have on people and the environment. It collects and purifies carbon dioxide at the source post-combustion before it enters the atmosphere. It is similar to an emission control system well-suited for flue gases from boilers, turbines, and industrial processes with low CO2 concentrations. It is positioned to play a pivotal role in the global efforts to combat climate change, offering a range of services that span the entire carbon capture value chain.
Key facts about Mitico
- Founded Year: 2022
- Location: Pasadena (United States)
- Stage: Series A
- Total Funding till date: $11.9M
- Employee Count: 14 as on Aug 31, 2026
- Investors: AP Ventures, W. L. Gore & Associates and 10 Others
- Latest Funding Round: Series A, Feb 25, 2025, $*****
- Highlight: Editors' Pick
4. Geolinks
Provider of geophysical monitoring using ambient-noise based technology for various markets. It offers solutions for mining, carbon dioxide storage, underground gas storage, and natural hydrogen. The technology transforms seismic ambient noise into subsurface fluid flow mapping. It provides real time alerts, permanent automatic systems, and continuous monitoring. The company also offers feasibility studies and expertise reports.
Key facts about Geolinks
- Founded Year: 2021
- Location: Paris (France)
- Stage: Series A
- Total Funding till date: $7.1M
- Employee Count: 17 as on May 31, 2026
- Investors: InnoEnergy, Bpifrance and 1 Other
- Latest Funding Round: Series A, Feb 09, 2026, $*****
- Highlight: Editors' Pick
5. Graforce
Developer of plasma-based systems for hydrogen production, water purification, and energy. The company provides modular plants for producing carbon-free or carbon-negative hydrogen from various residual materials. It offers technology for decarbonizing fossil fuels and industrial gases. The company’s systems support energy, real estate, steel, cement, mobility, transport, and recycling sectors.
Key facts about Graforce
- Founded Year: 2012
- Location: Berlin (Germany)
- Stage: Seed
- Employee Count: 22 as on Aug 31, 2026
- Investors: IBG Beteiligungsgesellschaft Sachsen-Anhalt, Calderion and 1 Other
- Latest Funding Round: Seed, Feb 25, 2026, $*****
Calderion's Year-on-Year Investment Trends
In 2025, it made 1 investment, while as of Jun 2026, it has made 4 investments in this year. Its most recent first time investment was in H2SITE.Calderion's Investments by Stage
Calderion has made 2 investments in Series A stage with an average round size of $21.8M, 2 investments in Series B stage with an average round size of $27.1M and 1 investment in Seed stage.Stage of entry | No. of Investments |
|---|---|
Series A | 2 |
Series B | 2 |
Seed | 1 |
Note: We have considered here, only first round of investments
Calderion's Investments by Sector
Calderion has a diverse portfolio, with companies operating in the Energy Tech, Environment Tech, Sustainability Tech, High Tech and Enterprise Applications. Notably, it has invested in 5 Enterprise (B2B) companies, 5 Tech companies, 2 Social impact companies and at least 1 company focusing on Software.Sector | No. of Investments |
|---|---|
Energy Tech | 5 |
Environment Tech | 5 |
Sustainability Tech | 5 |
High Tech | 4 |
Enterprise Applications | 1 |
Others | 2 |
Note: We have considered here, only first round of investments
Calderion's Investments by Geography
Calderion has made most investments in France (3), followed by Germany where it has made 1 investment.Country | No. of Investments |
|---|---|
France | 3 |
Germany | 1 |
Spain | 1 |
Note: We have considered here, only first round of investments
Calderion's recent investments
Calderion has made 4 investments in 2026 so far. H2SITE and Mantle8 are the latest among them.Here are the most recent investments by Calderion:
Filter this listDate | Company | Location | Round Details | Round Amount | Co-Investors |
|---|---|---|---|---|---|
Jun 25, 2026 | Spain | Series B | 6801 | ||
May 13, 2026 | France | Series A | 4919 | [+4] | |
Feb 25, 2026 | Germany | Seed | 7033 | ||
Feb 09, 2026 | France | Series A | 6885 | [+1] | |
Jul 02, 2025 | France | Series B | 2473 | [+1] |
Team profile of Calderion
Calderion has a team of 4 members including 3 Partners and 1 Principal located in France. Calderion's team does not sit on the board of any company as of now.Here is a list of all team members in Calderion:
Name | Designation | Location | Board Memberships | Contact Details |
|---|---|---|---|---|
Partner | France | - | - | |
Partner | France | - | - | |
Partner | France | - | - | |
Principal | Paris | - | - |
Co-investors of Calderion
Over the past year, 26 investors have co-invested in Calderion's portfolio companies. This includes funds and angels.
- Invested before Calderion: Breakthrough Energy, ENGIE New Ventures and 14 others have invested in rounds before Calderion. There are 2 companies where Breakthrough Energy has invested before Calderion and 1 company where ENGIE New Ventures has invested before Calderion.
- Top Co-investors of Calderion: 9 investors entered a company along with Calderion. These include investors like Bpifrance (2 companies).
- Invested after Calderion: Enova (1 company) is the only investor which has invested in Calderion's portfolio after their investments.
Recent News related to Calderion
•
H2SITE secures new strategic investment to accelerate the industrial application of solutions for hydrogen production and separationBusiness Wire•Jun 26, 2026•European Innovation Council, Calderion, Suma Capital, Enagas and 3 others
•
Mantle8’s €31M Series A Signals Maturing Bet on Natural Hydrogen, But the Hard Part Starts NowEnergynews•May 13, 2026•Mantle8, Bpifrance, Breakthrough Energy, Sandwater and 4 others
•
Calderion, WenCo and Terravent Invest in Graforce to Scale Plasma Pyrolysis GloballyNewswire•Feb 26, 2026•Calderion, Graforce, WEGA Support, Terravent and 2 others
•
France-Based Geolinks Services Raises $7.1M FundingStartup Rise EU•Feb 10, 2026•InnoEnergy, Geolinks, Bpifrance, Calderion and 1 other
