# Karol Szubstarski

> Karol Szubstarski is a seed investor at OTB Ventures backing Artificial Intelligence. See 5 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [OTB Ventures](https://shizune.co/investors/profile/otb-ventures)
- Location: Warsaw, Poland
- Total investments: 5
- Last investment: Mar 2026
- Lead investor: 40%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/karol-szubstarski-93462073

Karol Szubstarski is a seed investor at OTB Ventures in Warsaw focused on Artificial Intelligence and Semiconductor. Karol is currently working as Investment Manager in OTB Ventures. He has joined new fund after 4 years as Associate / Investment Analyst in Intel Capital. Prior to this role he was involved in Insight & Market Research team in Intel & has taken part in Talent Development Program in L’Oreal. Karol holds double major from Warsaw Schoolof Economics & Poznan University of Economics. In his free time, he enjoys sailing & travelling.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Artificial Intelligence | 4 | 80% |
| Semiconductor | 2 | 40% |
| Machine Learning | 2 | 40% |
| Internet of Things | 2 | 40% |
| B2B | 1 | 20% |

10 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 3 | 60% |
| Funding Round | 1 | 20% |
| Venture - Series Unknown | 1 | 20% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Switzerland | 2 | 40% |
| Romania | 1 | 20% |
| United States | 1 | 20% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Waiv | Owkin is a French-American startup that uses artificial intelligence to find the right treatment for every patient. Our focus is to use AI to discover and develop better treatments for unmet medical needs, starting with the fight against cancer.They use AI to identify new drug candidates, de-risk and accelerate clinical trials and builddiagnostic tools that improve patient outcomes. Using federated learning, a pioneering collaborative AI framework, Owkin enables medical and biopharma partners to unlock valuable insights from siloed datasets, while protecting patient privacy and securing proprietary data. Owkin was co-founded by Thomas Clozel MD, a clinical research doctor and former assistant professor in clinical onco-hematology, and Gilles Wainrib, a pioneer in the field of machine learning in biology, in 2016.Owkin has raised over $255 million and became a ‘unicorn’ – a startup valued at more than $1 billion – in November 2021 through a $180 million investment from French biopharma company Sanofi. | $33M | Venture - Series Unknown | Mar 12, 2026 |  |
| Synthara Technologies | Synthara is a Zurich-based artificial intelligence (AI) company that provides system-level solutions for businesses to enhance their products or services with smart features. The company portable and wearable gadgets such as virtual reality headsets, small wireless monitoring cameras, sensor networks, have limited smart features because computingpowerful algorithms cannot be run on them. Synthara IPs provide server-class performance with an extremely low energy requirement for neural networks (10 TOPs/Watt). | $11M |  | Jun 05, 2024 |  |
| Synthara | Synthara is a Swiss semiconductor startup revolutionizing the compute performance of embedded chips by orders of magnitude. We are working on a new breed of energy-efficient computational AI chips that are hand-crafted for smart sensor applications such as hearing aids, wearables, biomedical monitoring, and AR/VR. Our flagship product,ComputeRAM, is a drop-in replacement for conventional SRAM that performs complex calculations directly in memory. This drastically reduces CPU workload, boosting system performance and delivering exceptional efficiency, especially for AI workloads. With ComputeRAM, we help chipmakers and device manufacturers lower costs, shorten time to market, and unlock new opportunities for innovation. | $5.5M | Seed | Jun 05, 2024 |  |
| SEMRON | SEMRON develops a 3D-scaled AI inference chip, based on a new proven semiconductor device. It creates ai chips with the smallest footprint without compromising on raw computing power. It was founded in 2020 by Aron Kirschen and Kai-Uwe Demasius. | $7.9M | Seed | Jan 30, 2024 |  |
| Dataworks Research SRL | Soleadify provides business data enrichment with unprecedented coverage of SMBs, accurate classification and in-depth insights based on real-time updates.Always driven by the complexity of AI and Machine Learning, we build more efficient ways of getting more data and get more out of it. Urged on reliability and complete-ness, our datasets haveyet to be beaten in terms of accuracy and classification by industry mammoths. | $6M | Seed | Feb 21, 2023 |  |

5 of 5 investments shown.

## Co-investors
- [Alpha Intelligence Capital](https://shizune.co/investors/profile/alpha-intelligence-capital) — VC Fund, 2 deals together
- [DeepIE Ventures Management Co.](https://shizune.co/investors/profile/deepie-ventures-management-co) — VC Fund, 2 deals together
- [Deeptech Labs](https://shizune.co/investors/profile/deeptech-labs) — VC Fund, 2 deals together
- [Excellis](https://shizune.co/investors/profile/excellis) — VC Fund, 2 deals together
- [HTGF (High-Tech Gruenderfonds)](https://shizune.co/investors/profile/high-tech-gr%C3%BCnderfonds) — VC Fund, 2 deals together
- [Onsight Ventures](https://shizune.co/investors/profile/onsight-ventures) — VC Fund, 2 deals together

## About OTB Ventures

VC Fund · Amsterdam, The Netherlands

OTB Ventures is a leading European VC focused on DeepTech with an unfair advantage in accessing Central and Eastern European (CEE) deal flow, investing in early growth, real tech startups (late Seed, Series A and B) that develop unique technologies in 4 verticals: SpaceTech, AI & Automation, FinTech and CybersecurityOTB Ventures wasestablished in 2017 and is currently the largest VC originating from the CEE, managing over $300M. OTB Ventures has two offices: Amsterdam (Netherlands) and Warsaw (Poland).

5 contacts available at OTB Ventures.

| Name | Title | Profile |
| --- | --- | --- |
| Marcin Hejka | Co-Founder & General Partner | https://shizune.co/investors/profile/marcin-hejka |
| Adam Niewinski | Co-Founder & General Partner | https://shizune.co/investors/profile/adam-niewinski |
| Jeremy Teboul | Partner | https://shizune.co/investors/profile/jeremy-ron-teboul |
| Karol Szubstarski | Partner | https://shizune.co/investors/profile/karol-szubstarski |
| Katarzyna Zwolanowska | Partner & Chief Operating Officer | https://shizune.co/investors/profile/katarzyna-zwolanowska |

## Similar investors

### Similar stage
- [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund
- [Alumni Ventures](https://shizune.co/investors/profile/alumni-ventures-group) — VC Fund
- [Right Side Capital Management](https://shizune.co/investors/profile/right-side-capital-management) — VC Fund

## FAQ

### What does Karol Szubstarski invest in?

Karol Szubstarski invests primarily in Artificial Intelligence, Semiconductor and Machine Learning startups, most often at Seed and Funding Round stage. Most of the 5 investments tracked by Shizune back companies in Switzerland. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Karol Szubstarski last invest?

The most recent investment recorded for Karol Szubstarski closed in Mar 2026. Shizune tracks 5 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 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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