# Stuart Ellman

> Stuart Ellman is a Series A investor at RRE Ventures backing Software and Financial Services. See 67 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [RRE Ventures](https://shizune.co/investors/profile/rre-ventures)
- Location: New York, United States
- Total investments: 67
- Last investment: Aug 2023
- Lead investor: 33%
- Last updated: Aug 2026
- LinkedIn: http://www.linkedin.com/pub/stuart-ellman/b/971/675
- X (Twitter): http://twitter.com/bikenyc
- Website: https://x.com/bikenyc
- Facebook: http://www.facebook.com/stuartellman

Stuart Ellman is a Series A investor at RRE Ventures in New York focused on Software and Financial Services. Stuart Ellman is Co-Founder and Managing Partner of RRE Ventures. He has been immersed in information technology since the early 1980s when he taught himself computer programming and sold computer hardware and software. Stuart previously worked at Columbia University in the City of New York as a Adjunct Associate Professor. He attended HarvardBusiness School and Wesleyan University.Since co-founding RRE in 1994, Stuart has been responsible for over forty technology investments, ranging from incubation-stage to post-revenue companies. He has invested in sectors across information technology, from security to green IT, from consumer-facing web companies to enterprise software. He believes that he is not a technologist but is a business person who utilizes technology to drive competitive advantage. He looks for big markets and superior management and has little interest in “me too” companies or following what is “hot” in the marketplace. He currently serves as a Board Director of Betaworks, Business Insider, Kroll Bond Ratings, Payfone, RecycleBank, SideTour and Tippr.Stuart began his career as a management consultant with McKinsey and Company in Australia. Later, he was a Financial Analyst at Dillon, Read & Co. where he focused on leveraged buyouts and restructurings and an Associate at Morgan Stanley & Co., specializing in fixed income capital markets. After graduating from business school in 1992, Stuart changed his life forever and became an entrepreneur. Stuart was the junior co-founder and Vice President at Advisory Capital Partners, a principal investment and advisory firm. Working nights and weekends, Stuart co-founded InterVideo Response with Jim in early 1994, which attempted to build in-stadium touchscreen ordering systems. They were ten years too early. After deciding against launching a second business plan involving pets and vets, the two decided to start their own investment firm late in 1994.In addition to his work as a venture investor, Stuart has served as an Adjunct Associate Professor at Columbia Business School since 2002, where he teaches a popular Venture Capital Seminar to MBA students. In 2011, he delivered the Keynote address at the Columbia Business School Private Equity and Venture Capital Conference. In 2009, he taught a graduate seminar at the CDTM in Munich, Germany, a joint program with Technical University and Ludwig Maximilians Universityb. He is the Treasurer/Chairman of the Finance Committee of the 92nd Street Y where he has been on the board since 2001. He is also on the board of The Browning School. Also, Stuart is a member of the New York City Investment Fund's Clean Tech Sector Group, the VC Advisory Group of the New York City Economic Development Corporation, the Economic Club of New York, and the NYC 2020 CEO Roundtable. He is also a TechStars mentor.Stuart holds an MBA with Distinction from Harvard University and a BA in Economics from Wesleyan University where he was a Gilbert Clee Scholar and a Horace White Fellow. Stuart resides in Manhattan with his wife of two decades, two kids and a spoiled black cat.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 11 | 16% |
| Financial Services | 8 | 12% |
| FinTech | 6 | 9% |
| Finance | 5 | 7% |
| Internet | 5 | 7% |

93 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 15 | 22% |
| Series B | 14 | 21% |
| Series C | 13 | 19% |
| Seed | 8 | 12% |
| Funding Round | 8 | 12% |

7 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 38 | 57% |
| Canada | 2 | 3% |
| Sweden | 1 | 1% |
| United Kingdom | 1 | 1% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Medbill AI | AI assistant that helps consumers save time and money on healthcare and medical bills. |  | Pre-Seed | Aug 01, 2023 |  |
| Haystacks.AI | Haystacks.AI uses real estate data, and numerous sources of ancillary data, to augment investment decisions in the single-family RE market. | $3M | Seed | Mar 23, 2022 |  |
| Fi | Fi is a provider of next Generation of Smart Dog Collars. | $30M | Series B | Feb 25, 2021 |  |
| Clearpath Robotics | Clearpath provides self-driving vehicle technology and services to over 500 of the world’s most innova-tive brands. Proprietary hardware, software, and services are delivered through the company’s industrial and research divisions: Clearpath Robotics and OTTO Motors. Visit www.clearpath.ai for more information. | $29.4M | Series C | Jun 01, 2020 |  |
| OTTO Motors | OTTO Motors, a division of Clearpath Robotics Inc. OTTO Motors provides autonomous mobile robots for material handling inside manufacturing facilities and warehouses. The vehicles operate with infrastructure-free navigation, offering intelligent, safe, efficient, and reliable transportation within industrial centers. Proprietary hardware, software,and services are delivered to provide customer excellence. | $29M | Series C | Jun 01, 2020 |  |
| Ladder | Ladder is a digital life insurance company that offers flexible term coverage in minutes saving policyholders up to 40%. It uses an all-digital architecture and real-time underwriting to make life insurance as accessible, affordable, and beloved as it should be. The company was founded in 2015 and is headquartered in Palo Alto, California. Itoffers coverage up to $8M in all 50 states. | $37.5M | Series C | Feb 21, 2020 |  |
| SquareFoot | SquareFoot serves companies that are looking for their next office and care deeply about finding the right next home. Growing companies require flexible lease options, a stress-free process, and transparency throughout the leasing journey. SquareFoot provides a seamless experience supported by easy-to-use technology and a highly responsive team ofreal estate professionals working to match specific client needs with a strong knowledge of what the market has to offer at any given moment. | $16M | Series B | Nov 06, 2019 |  |
| OneDrop | One Drop is a diabetes management platform that helps people navigate diabetes together. It is an app for a diabetes management company. The app was created by Jeff Dachis, a co-founder of Razorfish, launched in the App Store this April as a way to help diabetics keep a running log of their personal insulin levels, the effectiveness of theirmedication, what they recently ate and what types of activities are affecting their blood sugar on a daily basis.It was incorporated in 2014 and is based in New York. |  | Series B | Sep 17, 2019 |  |
| Kaleidoscope Labs | They create unique formulations of full-spectrum hemp in combination with other natural ingredients and harness them in microencapsulated capsules designed to increase their bioavailability. Then you put them to work.Inspired by both nature and medicine, they source single-origin plants to extract their full spectrum, meaning they take all thebeneficial nutrients and leave nothing out. All the fats, proteins, vitamins stay in the bottle – just like they should.Their measured dosing ensures that you take the recommended amount. Every time and in every pill. Equal dosage lets you customize your experience and tailor it to your needs. Rather than dealing with a messy, inconsistent dropper or a gummy bear that doesn’t get enough of the good stuff into your system, Kaleidoscope is the smart way to ingest CBD. It’s convenient and fits into your daily routine, even when your 24-hour-day starts to feel like 32.Nurturing body and mind, Kaleidoscope promotes health, helping to make you more effective in daily life. Kaleidoscope creates a sense of well-being and energy – based on your own pattern.When you take any pill, you deserve to know what’s in it. With their supplements, we promise transparency. We promise that what we print on their labels is what we put in their product. | $4M | Seed | Jul 08, 2019 |  |
| Players' Lounge | Players’ Lounge is a real money gaming platform built for video games. Gamers can wager on their own performance or stake others in competitive titles like Call of Duty, Fortnite, and Madden. Whether you’re playing or spectating, Players’ Lounge makes every match a chance to win real money — by betting on your own skill or backing the players youbelieve in.We’re capturing the next generation of bettors — digital natives who prefer interactive, creator-driven experiences over traditional sports. Players’ Lounge turns every match and livestream into a high-stakes opportunity, merging gaming, streaming, and social wagering into one immersive ecosystem. | $3M | Seed | Mar 28, 2019 |  |

10 of 67 investments shown.

## Co-investors
- [Lerer Hippeau](https://shizune.co/investors/profile/lerer-ventures) — VC Fund, 11 deals together
- [Bessemer Venture Partners](https://shizune.co/investors/profile/bessemer-venture-partners) — VC Fund, 9 deals together
- [Lightspeed Venture Partners](https://shizune.co/investors/profile/lightspeed-venture-partners) — VC Fund, 5 deals together
- [Bain Capital Ventures](https://shizune.co/investors/profile/bain-capital-ventures) — VC Fund, 4 deals together
- [Betaworks](https://shizune.co/investors/profile/betaworks) — VC Fund, 4 deals together
- [BoxGroup](https://shizune.co/investors/profile/boxgroup) — VC Fund, 4 deals together

## About RRE Ventures

VC Fund · New York, United States

RRE Ventures is a venture capital firm that invests in early-stage technology companies across various sectors. RRE Ventures invests in early-stage companies, often participating in Seed and Series A funding rounds. They look for innovative technology solutions and scalable business models.

5 contacts available at RRE Ventures.

| Name | Title | Profile |
| --- | --- | --- |
| Stuart Ellman | Co-Founder & General Partner | https://shizune.co/investors/profile/stuart-ellman |
| Ana Rosenstein | Senior Associate | https://shizune.co/investors/profile/ana-rosenstein |
| James Robinson | Co-Founder, General Partner, and Managing Partner | https://shizune.co/investors/profile/james-d-robinson |
| James Robinson | Founder & General Partner | https://shizune.co/investors/profile/james-d-robinson-iii |
| John R. Hass | Partner | https://shizune.co/investors/profile/john-r-hass |

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## FAQ

### What does Stuart Ellman invest in?

Stuart Ellman invests primarily in Software, Financial Services and FinTech startups, most often at Series A and Series B stage. Most of the 67 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Stuart Ellman last invest?

The most recent investment recorded for Stuart Ellman closed in Aug 2023. Shizune tracks 67 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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