# Karel Tušek

> Karel Tušek is a seed investor at Tachles VC (Prague) backing Cyber Security and Software. See 2 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Tachles VC](https://shizune.co/investors/profile/tachles-vc)
- Location: Prague, Czech Republic
- Total investments: 2
- Last investment: Apr 2022
- Lead investor: 100%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/kareltusek/?originalSubdomain=cz
- Facebook: https://www.facebook.com/karel.tusek

Karel Tušek is a seed investor at Tachles VC in Prague focused on Cyber Security and Software. Karel Tušek is based out of Prague and is the Managing Partner and Co-Founder of Tachles VC. Karel previously worked at Crystal Web Limited as a Co-Founder. Karel Tušek attended Charles University.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Cyber Security | 2 | 100% |
| Software | 1 | 50% |
| Artificial Intelligence | 1 | 50% |

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 1 | 50% |
| Series B | 1 | 50% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Source Defense | In an industry focused on detection, Source Defense provides websites with the first ever prevention technology for attacks of third-party origin. We are the first ever SAAS platform that allows a site owner to set and enforce permissions, receive real-time alerts and monitor third-party vendors' behavior on their site. By removing thesecurity considerations from third-party integrations, we can save countless man-hours spent on tests and integrations, allowing sites to focus on generating revenues and new opportunities while keeping the site visitors safe and the site in high performance. | $27M | Series B | Apr 26, 2022 |  |
| Cognni | Cognni is zero-effort information intelligence that adds meaning to any piece of information created, downloaded, accessed, or shared.Cognni makes an InfoSec think like a human, so the user can focus on the bigger picture, keeping the information flow safe. The company was previously known as Shieldox that was founded in 2017 and based in TelAviv, Israel. | $3M | Seed | Aug 15, 2021 |  |

2 of 2 investments shown.

## Co-investors
- [Jerusalem Venture Partners (JVP)](https://shizune.co/investors/profile/jerusalem-venture-partners) — VC Fund, 2 deals together
- [AllegisCyber](https://shizune.co/investors/profile/allegis-capital) — VC Fund, 1 deal together
- [Capital One Ventures](https://shizune.co/investors/profile/capital-one-growth-ventures) — VC Fund, 1 deal together
- [Capital One Ventures](https://shizune.co/investors/profile/capital-one-ventures) — VC Fund, 1 deal together
- [Connecticut Innovations](https://shizune.co/investors/profile/connecticut-innovations) — VC Fund, 1 deal together
- [Global Brain Corporation](https://shizune.co/investors/profile/global-brain-corporation) — VC Fund, 1 deal together

## About Tachles VC

VC Fund · Peachtree City, United States

Tachles VC Backing early-stage tech startups, particularly from Israel.

3 contacts available at Tachles VC.

| Name | Title | Profile |
| --- | --- | --- |
| David Marek | Managing Partner and Co-Founder | https://shizune.co/investors/profile/david-marek-53bd |
| Karel Tušek | Managing Partner and Co-Founder | https://shizune.co/investors/profile/karel-tusek |
| Robin Bienfait | Partner | https://shizune.co/investors/profile/robin-bienfait |

## 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 Karel Tušek invest in?

Karel Tušek invests primarily in Cyber Security, Software and Artificial Intelligence startups, most often at Seed and Series B stage. Most of the 2 investments tracked by Shizune back companies in Israel. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Karel Tušek last invest?

The most recent investment recorded for Karel Tušek closed in Apr 2022. 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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