# Alexander Rosen

> Alexander Rosen is a Series A investor at Stanford University Graduate School of Business backing Software. See 67 investments, check sizes, portfolio…

- Type: Angel Investor
- Fund: [Stanford University Graduate School of Business](https://shizune.co/investors/profile/stanford-university-graduate-school-of-business)
- Location: San Francisco, United States
- Total investments: 67
- Last investment: Aug 2026
- Lead investor: 22%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/rosenalexander/
- X (Twitter): https://twitter.com/Rosenrosen
- Website: https://x.com/Rosenrosen

Alexander Rosen is a Series A investor at Stanford University Graduate School of Business in San Francisco focused on Software and Analytics. Alexander Rosen is the Managing Partner & Co-Founder at Ridge Ventures.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 15 | 22% |
| Analytics | 9 | 13% |
| Internet | 8 | 12% |
| SaaS | 7 | 10% |
| E-Commerce | 7 | 10% |

93 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 17 | 25% |
| Seed | 16 | 24% |
| Series B | 10 | 15% |
| Series C | 5 | 7% |
| Funding Round | 5 | 7% |

11 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 40 | 60% |
| Finland | 1 | 1% |
| United Arab Emirates | 1 | 1% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Horizon3.ai | Horizon3.ai's mission is to help you find and fix your attack vectors before criminals exploit them. NodeZero, our automated penetration testing solution, enables organizations to continuously assess the security posture of their enterprise, including external, identity, on-prem, IoT, and cloud attack surfaces. Like APTs, ransomware, andother threat actors, our algorithms discover and fingerprint your attack surface, identifying the ways exploitable vulnerabilities, misconfigurations, harvested credentials, and dangerous product defaults can be chained together to facilitate a compromise. NodeZero is a true self-service SaaS offering that is safe to run in production and requires no persistent or credentialed agents. You will see your enterprise through the eyes of the attacker, identify your ineffective security controls, and ensure your limited resources are spent fixing problems that can actually be exploited. Founded in 2019 by industry, US Special Operations, and US National Security veterans, Horizon3.ai is headquartered in San Francisco, CA, and made in the USA. | $250M | Series E | Aug 03, 2026 |  |
| ReFiBuy | Triangle Tweener Fund seeks to create an index of private company investments in their early stages. Its goal is to create an index of Triangle-area early-stage, high-tech startups that meet the 'Tweener List' Criteria. | $15.3M | Seed | May 05, 2026 |  |
| GoodDay Software | GoodDay Software innovating on the most challenging problems facing commerce brands today. As former brand operators, we’re passionate about helping brands become more efficient and profitable, with fewer resources. | $7M | Venture - Series Unknown | Jan 15, 2026 |  |
| Flip CX | The holy grail of customer service is high quality affordable phone support. Previously? Impossible. Now? Easy. | $20M | Series A | Jan 13, 2026 |  |
| Besty AI | Bloom is the creator of an online data analysis platform that aims to transform data into revolutionary business outcomes. The firm platform uses artificial intelligence to give real time analytics and business insights, as well as interactive and enterprise data analytics, allowing business teams to monitor and make data-driven choices in realtime. | $1.5M | Seed | Aug 20, 2024 |  |
| OfferFit | OfferFit is an AI-powered experimentation platform that automates decision-making and personalization for businesses. It enables companies to optimize customer engagement strategies by continuously testing and learning from various offers and interactions. The platform leverages machine learning to deliver tailored recommendations, improvingmarketing effectiveness and customer experience. | $25M | Series B | Nov 14, 2023 |  |
| SafeGraph | SafeGraph builds and maintains data sets to help accelerate machine learning and AI. Its high-precision places data covers business listings, building footprints, and aggregated foot traffic data for millions of points of interest (POI) and thousands of brands in the US and Canada. With detailed brand affiliation, spatial hierarchy, and other keybusiness details, SafeGraph data informs market analytics, investment research, site selection, and more.It was founded in 2016 and is based in San Francisco, California. | $45M | Series B | Mar 16, 2021 |  |
| SafeGraph | SafeGraph builds and maintains data sets to help accelerate machine learning and AI. Its high-precision places data covers business listings, building footprints, and aggregated foot traffic data for millions of points of interest (POI) and thousands of brands in the US and Canada. With detailed brand affiliation, spatial hierarchy, and other keybusiness details, SafeGraph data informs market analytics, investment research, site selection, and more.It was founded in 2016 and is based in San Francisco, California. | $45M | Series B | Mar 16, 2021 |  |
| Horizon3.ai | Horizon3.ai's mission is to help you find and fix your attack vectors before criminals exploit them. NodeZero, our automated penetration testing solution, enables organizations to continuously assess the security posture of their enterprise, including external, identity, on-prem, IoT, and cloud attack surfaces. Like APTs, ransomware, andother threat actors, our algorithms discover and fingerprint your attack surface, identifying the ways exploitable vulnerabilities, misconfigurations, harvested credentials, and dangerous product defaults can be chained together to facilitate a compromise. NodeZero is a true self-service SaaS offering that is safe to run in production and requires no persistent or credentialed agents. You will see your enterprise through the eyes of the attacker, identify your ineffective security controls, and ensure your limited resources are spent fixing problems that can actually be exploited. Founded in 2019 by industry, US Special Operations, and US National Security veterans, Horizon3.ai is headquartered in San Francisco, CA, and made in the USA. | $3.5M | Seed | Jan 24, 2020 |  |
| Outlier | Outlier offers analytic solutions that enable businesses to make better decisions. Moreover, Outlier monitors business data and notifies the user when unexpected changes occur. | $22.1M | Series B | Jan 22, 2020 |  |

10 of 67 investments shown.

## Co-investors
- [Flight Ventures](https://shizune.co/investors/profile/flight-ventures) — VC Fund, 6 deals together
- [Ignition Partners](https://shizune.co/investors/profile/ignition-partners) — VC Fund, 6 deals together
- [Rally Ventures](https://shizune.co/investors/profile/rally-ventures) — VC Fund, 5 deals together
- [Blumberg Capital](https://shizune.co/investors/profile/blumberg-capital) — VC Fund, 4 deals together
- [InterWest Partners](https://shizune.co/investors/profile/interwest-partners) — VC Fund, 4 deals together
- [New Enterprise Associates](https://shizune.co/investors/profile/new-enterprise-associates) — VC Fund, 4 deals together

## About Stanford University Graduate School of Business

VC Fund

Stanford University Graduate School of Business, a school that built a global reputation based on its management and leadership programs.

5 contacts available at Stanford University Graduate School of Business.

| Name | Title | Profile |
| --- | --- | --- |
| Raymond Nasr | Lecturer | https://shizune.co/investors/profile/raymond-nasr |
| Alexander Rosen | GSB Trust Board Member. Chair, Venture Fund Group | https://shizune.co/investors/profile/alexander-rosen |
| Alexandra Watkins | Guest Lecturer | https://shizune.co/investors/profile/alexandra-watkins |
| Anne Raimondi | Lecturer in Management, Center for Entrepreneurial Studies | https://shizune.co/investors/profile/anne-raimondi |
| Bruce Cahan | Faculty Affiliate | https://shizune.co/investors/profile/bruce-cahan |

## Similar investors

### Similar stage
- [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund
- [Alumni Ventures](https://shizune.co/investors/profile/alumni-ventures-group) — VC Fund
- [General Catalyst](https://shizune.co/investors/profile/general-catalyst-partners) — VC Fund

## FAQ

### What does Alexander Rosen invest in?

Alexander Rosen invests primarily in Software, Analytics and Internet startups, most often at Series A and Seed 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 Alexander Rosen last invest?

The most recent investment recorded for Alexander Rosen closed in Aug 2026. 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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