# Jim Warner

> Jim Warner is a seed investor backing Advertising and Digital Media. See 1 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: Angel Investor
- Location: New York, United States
- Total investments: 1
- Last investment: Dec 2021
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/warnerjamesa

Jim Warner is a seed investor in New York focused on Advertising and Digital Media. James Warner has served as a member of our board of directors and as chairman of the compensation committee since February 2013, and as our lead independent director since December 2013. Since January 2009, he has been a Principal of Third Floor Enterprises, an advisory firm specializing in digital marketing and media. From January 2000 untilDecember 2008, Warner served in various leadership roles at aQuantive Inc., including as Executive Vice President at Razorfish Inc. (formerly Avenue A), which was acquired by Microsoft Corporation in August 2007. Prior to aQuantive, he held leadership positions at HBO, CBS and Primedia. James is also a member of the board of directors for Merkle, Inc., Invision, Inc., Zoom, Inc. and Healthline Networks, Inc. From 2011 to 2012, James served as a member of the board of directors of MediaMind, Inc.James received a Bachelor of Arts degree in American Studies from Yale University and a Master in Business Administration from Harvard Business School. The board of directors believes that James’s experience in the consumer and digital marketing and media industries allows him to make valuable contributions to the board of directors.

## Contacts

5 contacts available for Jim Warner: 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/jim-warner?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Advertising | 1 | 100% |
| Digital Media | 1 | 100% |
| Sales Automation | 1 | 100% |
| Video Advertising | 1 | 100% |
| Mobile Advertising | 1 | 100% |

6 industries tracked in total.

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| ArcSpan Technologies | ArcSpan is a B2B audience data technology company that delivers enterprise-class addressable audience data monetization platform solutions to maximize publisher’s ad sales revenue amidst the "identity revolution.” | $6M | Seed | Dec 15, 2021 | https://www.arcspan.com/ |

1 of 1 investments shown.

## Co-investors
- [AperiamVentures](https://shizune.co/investors/profile/mathcapital) — VC Fund, 1 deal together

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## FAQ

### What does Jim Warner invest in?

Jim Warner invests primarily in Advertising, Digital Media and Sales Automation startups, most often at Seed stage. Most of the 1 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 Jim Warner?

Public channels for Jim Warner include LinkedIn. 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 Jim Warner last invest?

The most recent investment recorded for Jim Warner closed in Dec 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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