# David Marek

> David Marek is a seed investor at Tachles VC (Prague) backing SaaS and Cyber Security. See 7 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: 7
- Last investment: Aug 2023
- Lead investor: 57%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/david-marek-674b2a12/

David Marek is a seed investor at Tachles VC in Prague focused on SaaS and Cyber Security. David Marek is based out of Prague and is the Managing Partner and Co-Founder of Tachles VC. David previously worked at Geewa as a Member of Supervisory Board. David Marek attended the University of Economics, Prague.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| SaaS | 2 | 29% |
| Cyber Security | 2 | 29% |
| PaaS | 1 | 14% |
| Banking | 1 | 14% |
| FinTech | 1 | 14% |

15 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 2 | 29% |
| Pre-Seed | 1 | 14% |
| Series C | 1 | 14% |
| Funding Round | 1 | 14% |
| Venture - Series Unknown | 1 | 14% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Israel | 3 | 43% |
| Czech Republic | 1 | 14% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Cyngular Security | Cyngular's ClouDFIR (Digital Forensics Incident Response) is a SaaS B2B Cloud Hunting, Investigation, and Response platform (CIRA by Gartner). |  |  | Aug 25, 2023 |  |
| Cyngular Security | Cyngular's ClouDFIR (Digital Forensics Incident Response) is a SaaS B2B Cloud Hunting, Investigation, and Response platform (CIRA by Gartner). |  | Seed | Aug 25, 2023 |  |
| Cyngular Security | Cyngular's ClouDFIR (Digital Forensics Incident Response) is a SaaS B2B Cloud Hunting, Investigation, and Response platform (CIRA by Gartner). |  | Pre-Seed | Oct 25, 2022 |  |
| Equalum | Equalum develops and markets a platform for real-time data ingestion and processing focused on Big Data for enterprises. It is the first Data Beaming platform, capable of instantly teleporting operational data from any source to real-time analytics environments. Built for scalability and ease of use, Equalum harnesses the power of Spark in anenterprise-grade environment – helping organizations accelerate past traditional ETL or open-source implementations. Nir Livneh founded it in June 2015, with its headquarters in Tel Aviv in Israel. | $14M | Series C | Aug 08, 2022 |  |
| NetOp.Cloud | NetOp CLD develops an autonomous network operation SaaS that simplifies the operations of enterprise networking architecture. It automatically optimizes the network settings using machine learning without disrupting overall service and while reducing manpower and operating costs. | $4.5M | Seed | Apr 27, 2022 |  |
| ThreatMark | ThreatMark is the future of trust in the digital world. The company was founded with a vision of bringing trust to interactions across all digital channels through profound cyber security know-how and latest advancements in AI & Data Analytics. ThreatMark processes a comprehensive set of data inputs to continuously validate user’s identity& their intentions while protecting the user’s most valuable assets.At ThreatMark, we make sure that the entire digital journey (onboarding, authentication, account management, transactions…) is trusted and safe for both end-users and businesses. Major banks use ThreatMark’s deep behavioral profiling engine to analyze vast numbers of user specific data & behavioral traits to precisely identify legitimate users and deny fraudsters in real-time. For banks and their users, ThreatMark enables seamless digital experience that does not require additional authentication nor rely on simple transaction monitoring. ThreatMark goes beyond the industry standards to validate more than 25 million users and over 1 billion logins and transactions yearly.ThreatMark is shifting the paradigm in the digital world with advanced solutions complemented by a dedicated team of fraud specialists & cybersecurity experts working in our Security Operations Center (SOC), who vigilantly watch for new malicious activities throughout the digital landscape. Among various honors and industry recognition, ThreatMark has been recognized by Gartner as a Representative Vendor for the Online Fraud Detection area in its 2020 Market guide, named Deloitte’s Top Technology Fast 50 for CE; won 2019 AI Award – Company of the Year; and was awarded EY Entrepreneur of The Year for 2019. | $3M | Venture - Series Unknown | Oct 21, 2021 |  |
| Cyngular Security | Cyngular's ClouDFIR (Digital Forensics Incident Response) is a SaaS B2B Cloud Hunting, Investigation, and Response platform (CIRA by Gartner). |  | Pre-Seed | Oct 13, 2021 |  |

7 of 7 investments shown.

## Co-investors
- [CAP Vista](https://shizune.co/investors/profile/cap-vista) — VC Fund, 2 deals together
- [ST Engineering Ventures Fund](https://shizune.co/investors/profile/st-engineering-ventures) — VC Fund, 2 deals together
- [VentureIsrael](https://shizune.co/investors/profile/ventureisrael) — VC Fund, 2 deals together
- [97212 Ventures](https://shizune.co/investors/profile/97212-ventures) — VC Fund, 1 deal together
- [Innovation Endeavors](https://shizune.co/investors/profile/innovation-endeavors) — VC Fund, 1 deal together
- [Labs/02](https://shizune.co/investors/profile/labs-02) — 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 David Marek invest in?

David Marek invests primarily in SaaS, Cyber Security and PaaS startups, most often at Seed and Pre-Seed stage. Most of the 7 investments tracked by Shizune back companies in Israel. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did David Marek last invest?

The most recent investment recorded for David Marek closed in Aug 2023. Shizune tracks 7 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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