# Roneil Rumburg

> Roneil Rumburg is a pre-seed investor backing Software. See 7 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: Angel Investor
- Location: San Francisco, United States
- Total investments: 7
- Last investment: Sep 2025
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/roneilr
- X (Twitter): https://twitter.com/roneilr

Roneil Rumburg is a pre-seed investor in San Francisco focused on Software and Artificial Intelligence. Roneil is the Co-Founder and CEO of Audius. Before joining Edge, Roneil co-founded Backslash, a cryptocurrency payment company, where he focused on security and backend software engineering. He's also spent time at Sparks Mobile, Nebula (as a 2013 KPCB Fellow), and AeroFS in software engineering roles. He graduated from Stanford in 2014 with aB.S. in Computer Science focused on systems. In his spare time, Roneil enjoys hiking, sailing, reading, and finding good wine and whisk(e)y.

## Contacts

5 contacts available for Roneil Rumburg: 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/roneil-rumburg?utm_source=investor_profile

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $2.7M–$4.5M |
| Pre-Seed | $850k–$1.6M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 3 | 43% |
| Artificial Intelligence | 3 | 43% |
| Music | 1 | 14% |
| FinTech | 1 | 14% |
| Ethereum | 1 | 14% |

10 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Pre-Seed | 4 | 57% |
| Seed | 2 | 29% |
| Angel | 1 | 14% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 3 | 43% |
| Canada | 2 | 29% |
| Germany | 1 | 14% |
| Switzerland | 1 | 14% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Coop Records | Coop Records investing in next generation of music enabled by Web3. | $4.5M | Seed | Sep 23, 2025 | https://www.cooprecords.xyz |
| Butler | Streamline your workflow with AI-powered summaries, contextual chat, a native meeting bot and more, all in one place. | $867.6K | Pre-Seed | Oct 23, 2024 | https://x.com/joinbutler/ |
| Butler | Streamline your workflow with agentic automations, contextual chat, lightning-fast search and a native meeting bot, all in one place. | $850K | Pre-Seed | Oct 23, 2024 | https://x.com/joinbutler/ |
| EarthFast | EarthFast provides cryptocurrency front-end hosting solutions. It enables projects to build and deploy decentralized apps, providing a secure alternative to traditional cloud platforms. | $1.4M | Pre-Seed | Sep 24, 2024 | https://x.com/EarthFast |
| GasHawk | GasHawk is a blockchain company that prevents failed and stuck transactions via our intelligent queue manager. | $1.6M | Pre-Seed | Sep 12, 2024 | https://x.com/gashawkio?lang=en |
| CitizenX | CitizenX is the world's first platform to help you find and fund places that welcome you as a citizen. Secure a safe haven and travel freely across the globe with a passport from your new home(s). | $2.5M | Angel | Oct 01, 2023 | https://citizenx.com |
| Audioshake | Audioshake makes sound more usable for both humans and machines by separating sound into its component parts. Used by some the world's largest media, entertainment, and tech companies, AudioShake is used in audio editing workflows, Voice AI, and multimodal training. | $2.7M | Seed | May 09, 2023 | https://www.audioshake.ai/ |

7 of 7 investments shown.

## Co-investors
- [Crush Music](https://shizune.co/investors/profile/crush-music) — VC Fund, 2 deals together
- [GoAhead Ventures](https://shizune.co/investors/profile/goahead-ventures) — VC Fund, 2 deals together
- [Nascent](https://shizune.co/investors/profile/nascent-91c1) — VC Fund, 2 deals together
- [Script Capital](https://shizune.co/investors/profile/122-west-ventures) — VC Fund, 1 deal together
- [1confirmation](https://shizune.co/investors/profile/1confirmation) — VC Fund, 1 deal together
- [1kx](https://shizune.co/investors/profile/1kx) — VC Fund, 1 deal together

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## FAQ

### What does Roneil Rumburg invest in?

Roneil Rumburg invests primarily in Software, Artificial Intelligence and Music startups, most often at Pre-Seed and Seed stage. Most of the 7 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Roneil Rumburg's check size?

Roneil Rumburg typically joins rounds of $2.7M–$4.5M at Seed and $850k–$1.6M at Pre-Seed. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Roneil Rumburg participates in.

### How do I contact Roneil Rumburg?

Public channels for Roneil Rumburg 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 Roneil Rumburg last invest?

The most recent investment recorded for Roneil Rumburg closed in Sep 2025. 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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