# Elek Straub

> Elek Straub is a Series A investor at Day One Capital backing Cyber Security and Network Security. See 1 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Day One Capital](https://shizune.co/investors/profile/day-one-capital)
- Total investments: 1
- Last investment: May 2021
- Lead investor: 100%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/elek-straub-9069744/
- Facebook: https://www.facebook.com/elek.straub

Elek Straub is a Series A investor at Day One Capital focused on Cyber Security and Network Security. Elek Straub is based out of Budapest, Hungary, and is the Managing Partner and Chairman of the Board of Day One Capital. Elek previously worked at Magyar Telekom as a Chairman and CEO. Elek Straub attended the Budapest University of Technology and Economics.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Cyber Security | 1 | 100% |
| Network Security | 1 | 100% |
| Communications Infrastructure | 1 | 100% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Whalebone | Whalebone provides zero-disruption protective DNS (PDNS) cybersecurity solutions designed for telcos, ISPs, critical-infrastructure enterprises, and government/public institutions. It provides millions of internet users with seamless digital life protection, keeping them secure against malware, phishing, ransomware, and other malicious digitalattacks – without the need to download anything. The European Commission has recognized Whalebone’s exceptional capabilities by appointing it the Consortium Leader for the European Union’s DNS4EU initiative. As the sole developer and operator of the official DNS resolver for the EU, in collaboration with a consortium of 13 members from 10 countries, governments and enterprises can leverage Whalebone's expertise in securing DNS servers to protect against evolving digital threats.The success of Whalebone Aura among global T1 telco providers validates the company’s ability to deliver robust DNS security that is effective, user-friendly, and brings value to their business. Whalebone’s products also include Peacemaker (for regional ISPs), Immunity (for enterprises), and DNS4GOV, all of which have proven instrumental in defending against threats to global DNS.Whalebone has more than 300+ customers around the globe and 100+ team members worldwide, with a mission is to bring cybersecurity to 1 billion people. | $3M | Series A | May 05, 2021 |  |

1 of 1 investments shown.

## Co-investors
- [Fazole Ventures](https://shizune.co/investors/profile/fazole-ventures) — VC Fund, 1 deal together

## About Day One Capital

VC Fund · Budapest, Hungary

Day One Capital is an early-stage venture capital fund that works with entrepreneurs and technology start-ups from Europe. As an early-stage technology investor, managing privately financed funds, Day One Capital seeks to find and join the most exciting Central Eastern European teams on their global mission.

5 contacts available at Day One Capital.

| Name | Title | Profile |
| --- | --- | --- |
| András Fehér | Associate | https://shizune.co/investors/profile/andr%C3%A1s-feh%C3%A9r |
| Csaba Kakosy | Managing Partner | https://shizune.co/investors/profile/csaba-kakosy |
| Dóra Branyiczki | Principal | https://shizune.co/investors/profile/d-ra-branyiczki |
| Elek Straub | Managing Partner and Chairman of the Board | https://shizune.co/investors/profile/elek-straub |
| Gyorgy Simo | Managing Partner, CEO | https://shizune.co/investors/profile/gyorgy-simo |

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## FAQ

### What does Elek Straub invest in?

Elek Straub invests primarily in Cyber Security, Network Security and Communications Infrastructure startups, most often at Series A stage. Most of the 1 investments tracked by Shizune back companies in Czech Republic. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Elek Straub last invest?

The most recent investment recorded for Elek Straub closed in May 2021. Shizune tracks 1 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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