# Stefan Brunner

> Stefan Brunner is a seed investor at Founderful (Zürich) backing SaaS and Audio. See 2 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Founderful](https://shizune.co/investors/profile/wingman-897a)
- Location: Zürich, Switzerland
- Total investments: 2
- Last investment: Mar 2021
- Lead investor: 100%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/brunnerstefan/
- X (Twitter): https://twitter.com/stefbrunner
- Website: http://www.stefan-brunner.ch

Stefan Brunner is a seed investor at Founderful in Zürich focused on SaaS and Audio. Entrepreneur | Co-founder bexio AG

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| SaaS | 1 | 50% |
| Audio | 1 | 50% |
| Music | 1 | 50% |
| Events | 1 | 50% |
| CleanTech | 1 | 50% |

10 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 1 | 50% |
| Venture - Series Unknown | 1 | 50% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Germany | 1 | 50% |
| Switzerland | 1 | 50% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| AIRICA | AIRICA combines real-time air quality measurements with advanced artificial intelligence and gives you continuous feedback on the quality of the indoor air. |  | Venture - Series Unknown | Mar 10, 2021 |  |
| OPTUNE | Optune is the first digital workspace that connects all stakeholders in the live music industry to facilitate their daily tasks focusing on event management and booking processing. Optune revolutionizes the existing workflow regarding efficiency, transparency and data driven optimization. onescreener, Optune’s promotion tool, helps artists tocreate a web presence in few simple clicks. |  | Seed | Nov 11, 2019 |  |

2 of 2 investments shown.

## Co-investors
- [SICTIC](https://shizune.co/investors/profile/sictic) — VC Fund, 1 deal together

## About Founderful

VC Fund · Zürich, Switzerland

Founderful operates as a venture capital firm and a Switzerland’s leading pre-seed fund.

5 contacts available at Founderful.

| Name | Title | Profile |
| --- | --- | --- |
| Alex Stöckl | Founding Partner | https://shizune.co/investors/profile/alex-stoeckl |
| Emily Kruse | Chief Financial Officer | https://shizune.co/investors/profile/emily-kruse |
| Lukas Weder | Founding Partner | https://shizune.co/investors/profile/lukas-weder |
| Pascal Mathis | Founding Partner | https://shizune.co/investors/profile/pascal-mathis |
| Antonia Albert | Principal | https://shizune.co/investors/profile/antonia-albert |

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### Similar stage
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### Similar country
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## FAQ

### What does Stefan Brunner invest in?

Stefan Brunner invests primarily in SaaS, Audio and Music startups, most often at Seed and Venture - Series Unknown stage. Most of the 2 investments tracked by Shizune back companies in Germany. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Stefan Brunner last invest?

The most recent investment recorded for Stefan Brunner closed in Mar 2021. Shizune tracks 2 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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