# Piotr Pietrzak

> Piotr Pietrzak is a seed investor at Tangent Line Ventures backing Artificial Intelligence. See 3 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Tangent Line Ventures](https://shizune.co/investors/profile/tangent-line-ventures)
- Location: Warsaw, Poland
- Total investments: 3
- Last investment: Dec 2023
- Lead investor: 33%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/piotr-pietrzak-631487/?originalSubdomain=pl

Piotr Pietrzak is a Founding Partner at Tangent Line

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Artificial Intelligence | 2 | 67% |
| Mining | 1 | 33% |
| Medical | 1 | 33% |
| Hospital | 1 | 33% |
| Analytics | 1 | 33% |

8 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 2 | 67% |
| Venture - Series Unknown | 1 | 33% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Poland | 2 | 67% |
| France | 1 | 33% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| MIM Fertility | MIM Fertility help fertility professionals improve patient outcomes and increase clinic efficiency by artificial intelligence to address infertility holistically. | $2M | Seed | Dec 04, 2023 |  |
| MagREEsource | MagREEsource is to link the circular economy by providing a green metallurgical solution through short loop recycling of NdFeB magnets to stabilise and diversify the supply of Rare Earth permanent magnets. | $5.4M | Seed | Jan 10, 2023 |  |
| ReliaSol (Reliability Solutions) | Reliability Solutions was established by a group of young scientists from AGH UST in Krakow – outstanding Polish technical university. Our mission is to transfer knowledge and novel solutions in data analysis from science to business. By the usage of cutting-edge scientific results in data science, we are able to predict machinery failures whatresults in huge financial benefits and safety increase to the industry. Due to cooperation with NVIDIA we use deep learning algorithms powered by GPUs to make better insight into data and highly improve the meaning of Predictive Maintenance. After positive feedback in Polish market we decided to leverage our transatlantic connection with US. | $2.2M | Venture - Series Unknown | Apr 06, 2022 |  |

3 of 3 investments shown.

## Co-investors
- [Qemetica Ventures (Formerly Ciech Ventures)](https://shizune.co/investors/profile/ciech-ventures) — VC Fund, 1 deal together
- [EIT RawMaterials](https://shizune.co/investors/profile/eit-rawmaterials) — VC Fund, 1 deal together
- [European Union](https://shizune.co/investors/profile/european-union) — VC Fund, 1 deal together
- [Finindus](https://shizune.co/investors/profile/finindus) — VC Fund, 1 deal together
- [Grenoble Angels](https://shizune.co/investors/profile/grenoble-angels) — VC Fund, 1 deal together
- [Linksium](https://shizune.co/investors/profile/linksium) — VC Fund, 1 deal together

## About Tangent Line Ventures

VC Fund · Warsaw, Poland

Tangent Line Ventures is a venture capital firm that provides capital and business partners for industrial technology startups.

2 contacts available at Tangent Line Ventures.

| Name | Title | Profile |
| --- | --- | --- |
| Monika Borowiecka | Managing Partner VC | https://shizune.co/investors/profile/monika-borowiecka |
| Piotr Pietrzak | Founding Partner | https://shizune.co/investors/profile/piotr-pietrzak-0b77 |

## 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 Piotr Pietrzak invest in?

Piotr Pietrzak invests primarily in Artificial Intelligence, Mining and Medical startups, most often at Seed and Venture - Series Unknown stage. Most of the 3 investments tracked by Shizune back companies in Poland. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Piotr Pietrzak last invest?

The most recent investment recorded for Piotr Pietrzak closed in Dec 2023. Shizune tracks 3 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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