# Sunfish Partners

> Sunfish Partners is a VC fund backing Artificial Intelligence and Software. See 41 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: VC Fund
- Location: Warsaw, Poland
- Total investments: 41
- Last investment: Nov 2025
- Lead investor: 73%
- Fund size: $18M
- Last fund: Mar 2019
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/company/sunfish-partners/
- X (Twitter): https://twitter.com/sunfishpartners
- Website: https://sunfish.vc

Sunfish Partners is an early stage VC that invests in Polish deep tech startups.

## Contacts

5 contacts available for Sunfish Partners. Shizune tracks 3 team members at Sunfish Partners. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-team-emails/sunfish-partners?utm_source=investor_profile

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $500k–$3.6M |
| Pre-Seed | $354k–$2.4M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Artificial Intelligence | 12 | 29% |
| Software | 9 | 22% |
| Machine Learning | 6 | 15% |
| Information Technology | 6 | 15% |
| Hardware | 4 | 10% |

59 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Pre-Seed | 18 | 44% |
| Seed | 14 | 34% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Poland | 18 | 44% |
| United Kingdom | 3 | 7% |
| United States | 2 | 5% |
| Estonia | 1 | 2% |
| Switzerland | 1 | 2% |

6 countries tracked in total.

## Team

| Name | Title | Investments | Profile |
| --- | --- | --- | --- |
| Marcus Erken | Founding Partner | 24 | https://shizune.co/investors/profile/marcus-erken |
| Max Moldenhauer | Founding Partner | 17 | https://shizune.co/investors/profile/max-moldenhauer |
| Christian Weiss | Founding Partner | 4 | https://shizune.co/investors/profile/christian-weiss |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Sky Spy | Sky Spy is a dual-use technology company developing innovative, compact, and reliable SIGINT systems for contested electromagnetic environments. Built through direct feedback from active combat zones, our products are designed alongside frontline military operators to ensure real-world effectiveness.Headquartered across the U.S. and the EU, weoperate as an agile, multinational team of veterans and technologists, committed to supporting NATO and allied forces with field-tested innovation.Our long-term vision is to become the global leader in multi-domain signal intelligence - delivering trusted RF awareness across air, ground, sea, and space, and empowering users with tools designed where they are needed most. | $1.6M | Pre-Seed | Nov 30, 2025 |  |
| HyperBunker | HyperBunker started from InfoLAB, the leading European Data Recovery & Security Lab. | $928.3K | Seed | Oct 14, 2025 |  |
| C2Grid | C2Grid delivers AI-powered 3D situational awareness by transforming video into interactive, multi-layered intelligence. Its technology enhances tactical and operational visibility, accelerates decision-making, and improves mission outcomes. Designed for both military and civilian use, C2Grid’s solutions save time, boost efficiency, and ultimatelyprotect lives. | $353.7K | Pre-Seed | Sep 18, 2025 |  |
| SI Robotics | SI Robotics develops data-driven humanoid robots designed to meet the strict transparency and validation rules of the EU Machinery Regulation (2027) and AI Act. Our platform, Joule-01, acts as a data-generation engine, collecting real-world motion, tactile, and force data to train reinforcement-learning models for dexterous manipulation.Wecombine three strategic layers: 1. Regulatory Advantage – Europe’s first and only compliance-native humanoid architecture, while US and Chinese “black-box” systems cannot meet EU traceability standards. 2. Data & Software Moat – proprietary dataset pipelines and embedded RL infrastructure enabling continuous learning and validation, forming the “ImageNet of Physical AI.” 3. Full-Stack Engineering & Manufacturing – in-house actuators, drives, and firmware for total control of IP, cost, and scaling — multiplying exit valuation through vertical integration.This unique combination makes SI Robotics the sole deployable humanoid platform for Europe, positioned to dominate industrial, defence, and aerospace applications as the world transitions to regulation-bound Physical AI. |  | Pre-Seed | Jul 15, 2025 |  |
| Ens Dynamics | We are dedicated to protecting human lives from aerial threats by leveraging autonomous technology while enabling scalable production. |  | Pre-Seed | Jul 10, 2025 |  |
| Asynchronics | Asynchronics is an open-source platform for high-fidelity digital twins, aimed at accelerating spacecraft system development. |  | Pre-Seed | Jun 24, 2025 |  |
| mysite.ai | mysite.ai is your first AI employee — built to run your business’s online presence. We start by instantly creating your website, and soon, we’ll handle your social media, ads, and lead generation too. No code. No hassle. Just real outcomes for small business owners. | $2.4M | Pre-Seed | Jun 17, 2025 |  |
| mysite.ai | Turn your designs into production-ready frontend <code> for web at blazing fast speed without compromising on code-quality and devex. | $2.4M | Pre-Seed | Jun 17, 2025 |  |
| DefendEye | World’s first fully Autonomous Drone, powered by AI, requires no human pilot, no setup, no programming, handling everything from Takeoff & Landing to Aerial Reconnaissance & Navigation. Launch-Tube can be in a backpack, or installed on a fence. It’s very simple to install, and it’s low cost. The drone searches & navigates to humans. AIDetects humans faster & more accurate than humans can. | $1.3M | Seed | May 21, 2025 |  |
| Zaitra | Zaitra reduces data transmission costs while also providing spaceship onboard and artificial intelligence services. | $1.9M | Pre-Seed | Oct 08, 2024 |  |

10 of 41 investments shown.

## Co-investors
- [Atmos Ventures](https://shizune.co/investors/profile/atmos-ventures) — VC Fund, 3 deals together
- [FundingBox Deep Tech Fund](https://shizune.co/investors/profile/fundingbox-deep-tech-fund) — VC Fund, 3 deals together
- [Hard2beat](https://shizune.co/investors/profile/hard2beat) — VC Fund, 3 deals together
- [Aligo Venture Capital](https://shizune.co/investors/profile/aligo-venture-capital) — VC Fund, 2 deals together
- [APEX Ventures](https://shizune.co/investors/profile/apex-ventures-12df) — VC Fund, 2 deals together
- [APEX Ventures](https://shizune.co/investors/profile/apex-ventures-2) — VC Fund, 2 deals together

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## FAQ

### What does Sunfish Partners invest in?

Sunfish Partners invests primarily in Artificial Intelligence, Software and Machine Learning startups, most often at Pre-Seed and Seed stage. Most of the 41 investments tracked by Shizune back companies in Poland. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Sunfish Partners's check size?

Sunfish Partners typically joins rounds of $500k–$3.6M at Seed and $354k–$2.4M at Pre-Seed. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Sunfish Partners participates in.

### How do I contact Sunfish Partners?

Public channels for Sunfish Partners include LinkedIn, X (Twitter) and the website linked on this profile. 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.

### Who are the partners at Sunfish Partners?

The team at Sunfish Partners includes Marcus Erken (Founding Partner), Max Moldenhauer (Founding Partner) and Christian Weiss (Founding Partner). The Team section lists each member with their title, investment count and links.

### 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 Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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