# Harry Marr

> Harry Marr is a seed investor in London backing Internet and Security. See 2 investments, check sizes, portfolio and contact details. Updated Oct 2026.

- Type: Angel Investor
- Location: London, United Kingdom
- Total investments: 2
- Last investment: Jul 2024
- Lead investor: 0%
- Last updated: Oct 2026
- LinkedIn: http://uk.linkedin.com/in/harrymarr
- X (Twitter): https://x.com/harrymarr

Harry Marr is a seed investor in London focused on Internet and Security. Harry Marr is the Director of Engineering at GitHub. Harry previously worked at Dependabot as a Co-Founder and CTO. He Attended University of Leeds.

## Contacts

5 contacts available for Harry Marr: work email, personal email, work phone, personal phone and socials. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-email/harry-marr?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Internet | 1 | 50% |
| Security | 1 | 50% |
| Cyber Security | 1 | 50% |
| Infrastructure | 1 | 50% |
| Developer Tools | 1 | 50% |

6 industries tracked in total.

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Arcjet | Arcjet helps developers protect their apps in just a few lines of code. Implement rate limiting, bot protection, email validation, and defense against common attacks. | $3.6M | Seed | Sep 10, 2024 | https://arcjet.com |
| Konvu | Konvu is a technology company building innovative security solutions that bridge the gap between security and developers. | $5M | Seed | Jul 17, 2024 | https://www.konvu.com/ |

2 of 2 investments shown.

## Co-investors
- [Andreessen Horowitz](https://shizune.co/investors/profile/andreessen-horowitz) — VC Fund, 1 deal together
- [BoxGroup](https://shizune.co/investors/profile/boxgroup) — VC Fund, 1 deal together
- [Emblem](https://shizune.co/investors/profile/emblem-074a) — VC Fund, 1 deal together
- [Picus Capital](https://shizune.co/investors/profile/picus-capital) — VC Fund, 1 deal together

## Similar investors

### Similar stage
- [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund
- [Right Side Capital Management](https://shizune.co/investors/profile/right-side-capital-management) — VC Fund
- [Alumni Ventures](https://shizune.co/investors/profile/alumni-ventures-group) — VC Fund

## FAQ

### What does Harry Marr invest in?

Harry Marr invests primarily in Internet, Security and Cyber Security startups, most often at Seed stage. Most of the 2 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### How do I contact Harry Marr?

Public channels for Harry Marr include LinkedIn and X (Twitter). For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.

### When did Harry Marr last invest?

The most recent investment recorded for Harry Marr closed in Jul 2024. 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 Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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