# James Siminoff

> James Siminoff is a seed investor in Santa Monica backing Email and Music. See 4 investments, round sizes, portfolio and contact details. Updated Oct 2026.

- Type: Angel Investor
- Location: Santa Monica, United States
- Total investments: 4
- Last investment: Feb 2020
- Lead investor: 0%
- Last updated: Oct 2026
- LinkedIn: http://www.linkedin.com/in/jamessiminoff
- X (Twitter): https://twitter.com/JamieSiminoff
- Website: http://jamessiminoff.com/
- Facebook: http://www.facebook.com/siminoff

James Siminoff is a seed investor in Santa Monica focused on Email and Music. James Siminoff is the Founder, CEO, and Chief Inventor of Ring. He attended Babson College.

## Contacts

5 contacts available for James Siminoff: 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/james-siminoff?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Email | 1 | 25% |
| Music | 1 | 25% |
| Mobile | 1 | 25% |
| Apparel | 1 | 25% |
| Wellness | 1 | 25% |

14 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 3 | 75% |
| Series A | 1 | 25% |

## Investments

| Company | Description | Round size | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Liquid Death | Liquid Death is the first bold, hilarious beverage focused on health and sustainability, and it is one of the fastest-growing non-alcoholic beverage brands of all time. They take the healthiest beverage available (water) and package it in infinitely recyclable tallboy cans that can compete with the fun marketing of unhealthy brands in energydrinks, beer, and junk food. In addition, Liquid Death donates 10% of its profits from each can sold to nonprofits that work to eliminate plastic pollution and provide clean drinking water to those in need. | $9M | Series A | Feb 20, 2020 | https://liquiddeath.com |
| HAAWK | HAAWK Specializing in YouTube, Facebook, and Instagram rights management, user-generated content monetization, copyright enforcement, digital music distribution, and micro-sync licensing. | $2.4M | Seed | Sep 20, 2017 | http://haawk.com |
| Unsubscribe.com | Unsubscribe is a powerful service that addresses a simple problem - getting rid of unwanted mailing lists. With the click of a button, users instantly send unwanted mailing lists to Unsubscribe.com for safe removal.Users can either download an Unsubscribe button to be used in their email client or forward unwanted mail from any device. Thecustom button allows one to check off multiple emails at a time to Unsubscribe from, revisiting a brand new inbox. |  | Seed | May 01, 2010 | http://www.unsubscribe.com |
| SimulScribe | SimulScribe operates PhoneTag, a voice to text service. To be precise, PhoneTag converts your voicemail into text messages and then sends them directly to your mobile phone, Blackberry, and/or your email account.Users are able to quickly see who has called and what they said, whether they are sitting in a business meeting or traveling on theroad. The user's voicemail functionality does not change; it can still be listened to and stored for later use. PhoneTag works with all Major U.S. carriers and networks including: AT&T, Alltell, Sprint, Skype, T-Mobile, Verizon, and Virgin.In September 2009 SimulScribe entered a strategic relationship with Ditech Networks, in which Ditech became the exclusive global marketing and sales partner for SimulScribe’s voice-to-text (VTT) applications to service providers and enterprises.Competitors include | $200K | Seed | Jan 01, 2004 | http://www.simulscribe.com/index.html |

4 of 4 investments shown.

## Co-investors
- [500 Global](https://shizune.co/investors/profile/500-startups) — VC Fund, 1 deal together
- [APEX Ventures](https://shizune.co/investors/profile/apex-ventures-12df) — VC Fund, 1 deal together
- [APEX Ventures](https://shizune.co/investors/profile/apex-ventures-2) — VC Fund, 1 deal together
- [Frontier Venture Capital](https://shizune.co/investors/profile/dfj-frontier) — VC Fund, 1 deal together
- [Manatt Venture Fund](https://shizune.co/investors/profile/manatt-venture-fund) — VC Fund, 1 deal together
- [PLG Ventures](https://shizune.co/investors/profile/plg-ventures) — 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 James Siminoff invest in?

James Siminoff invests primarily in Email, Music and Mobile startups, most often at Seed and Series A stage. Most of the 4 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 James Siminoff?

Public channels for James Siminoff include LinkedIn, X (Twitter) and the website linked on this profile. 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 James Siminoff last invest?

The most recent investment recorded for James Siminoff closed in Feb 2020. Shizune tracks 4 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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