Christoph Ostermann
Co-Founder & CEO @ Green Flexibility
Kempten, Germany
Christoph Ostermann is a Co-Founder at Sonnen.
- Total investments:
- 4
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries Christoph Ostermann invests in
Stages Christoph Ostermann invests in
Countries Christoph Ostermann invests in
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Investment Focus
Industry
- Energy Storage 2 (50%)
- Renewable Energy 2 (50%)
- Energy 1 (25%)
- Clean Energy 1 (25%)
- Electric Vehicle 1 (25%)
Stage
- Series A 2 (50%)
- Seed 1 (25%)
- Series B 1 (25%)
Country
- Germany 2 (50%)
- Austria 1 (25%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
Efficient Energy Technology
|
Efficient Energy Technology makes renewable energy simple, safe, and dependable for everyone. Efficient Energy Technology develops a small power plant consisting of photovoltaic and storage for complete self-installation. | $7.2M / Series A / Aug 04, 2023 | |
ESFORIN
|
ESFORIN SE is a fully digital energy company, offering modularly integrable energy solutions – for both, power and gas. | $8.1M / Series B / May 24, 2023 | |
Numbat
|
Numbat is a clean-tech company from Kempten (Allgäu). The competence lies in the development and production, as well as the operation of High-Power charging solutions with integrated battery storage system. The goal is to establish Europe's densest High-Power charging infrastructure to support e-mobility and its challenges. The battery storagereduces electricity costs and eases the burden on grids, while the integrated fast charging station allows customers/visitors/employees to fully charge their electric vehicles within 15 minutes. Depending on the location, the Numbats can be provided free of charge in a platform model. With its patented climate protection technology and multi-lifecycle approach, the Numbat is the most sustainable solutions on the market. | Seed / Jul 28, 2022 | |
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ESFORIN
|
ESFORIN SE is a fully digital energy company, offering modularly integrable energy solutions – for both, power and gas. | Series A / Apr 20, 2021 |
Co-Investors
About Green Flexibility
Green Flexibility operates as a manufacturer of extensive battery storage systems.
Green Flexibility Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Bernd Arkenau
Co-Founder & CFO
|
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Christoph Lienert
Co-Founder & COO
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Christoph Ostermann
Co-Founder & CEO
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Hermann Schweizer
Co-Founder & CTO
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FAQ
What does Christoph Ostermann invest in?
Christoph Ostermann invests primarily in Energy Storage, Renewable Energy and Energy startups, most often at Series A and Seed stage. Most of the 4 investments tracked by Shizune back companies in Germany. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact Christoph Ostermann?
Public channels for Christoph Ostermann include LinkedIn. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Christoph Ostermann last invest?
The most recent investment recorded for Christoph Ostermann closed in Aug 2023. Shizune tracks 4 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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