# David DeWalt

> David DeWalt is a Series A investor at Momentum Cyber backing Cyber Security and Security. See 29 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Momentum Cyber](https://shizune.co/investors/profile/momentum-cyber)
- Location: San Francisco, United States
- Total investments: 29
- Last investment: Aug 2026
- Lead investor: 69%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/ddewalt

David DeWalt is a Series A investor at Momentum Cyber in San Francisco focused on Cyber Security and Security. David G. DeWalt is based out of Scottsdale, Arizona, and is the CEO and founder of NightDragon and board chairman of Claroty. David previously worked at the U.S. Department of Homeland Security as a vice chairman, CISA Advisory Council, Department of Homeland Security. David G. DeWalt attended the University of Delaware.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Cyber Security | 12 | 41% |
| Security | 8 | 28% |
| Software | 7 | 24% |
| Network Security | 7 | 24% |
| Artificial Intelligence | 5 | 17% |

39 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 4 | 14% |
| Series C | 4 | 14% |
| Series E | 4 | 14% |
| Venture - Series Unknown | 4 | 14% |
| Seed | 2 | 7% |

9 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 17 | 59% |
| Israel | 1 | 3% |
| United Kingdom | 1 | 3% |

## 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 |  |
| Blackbird.AI | Blackbird.AI provides narrative and risk intelligence tools that deliver advanced AI-powered solutions in its mission to empower trust, safety, and integrity across the information ecosystem. The Blackbird Constellation Platform™ powers the detection and analysis of information-driven attacks, narrative manipulation, and threat evolution across adynamic adversarial environment. | $28M | Series B | Jan 07, 2026 |  |
| HawkEye 360 | HawkEye 360 is a data analytics company that develops space-based radio frequency mapping. The company operates a commercial satellite constellation to identify, process, and geolocate a broad set of RF signals. Its products include maritime domain awareness and spectrum mapping and monitoring; our customers include a wide range of commercial,government, and international entities.It was founded in 2015 and is headquartered in Herndon, Virginia. | $150M | Series E | Dec 18, 2025 |  |
| Human Security | HUMAN is a cybersecurity company that protects enterprises from bot attacks to keep digital experiences human. We have the most advanced Human Verification Engine that protects applications, APIs and digital media from bot attacks, preventing losses and improving the digital experience for real humans. Today we verify the humanity of more than 10trillion interactions per week for some of the largest companies and internet platforms. Protect your digital business with HUMAN. To Know Who’s Real, visit www.humansecurity.com. | $50M | Venture - Series Unknown | Oct 09, 2024 |  |
| Rhombus Systems | Rhombus provides intelligent cloud-managed video security for enterprises that do not require complicated servers or NVRs. Rhombus was founded by a group of engineers who previously founded and sold two businesses, the most recent of which was Mojave Networks, which was acquired by Sophos. Because of their extensive experience working withenterprise IT organizations, the founding team witnessed firsthand how difficult existing enterprise physical security systems were to use and wondered why these systems couldn't be as simple to use as consumer ones. | $45M | Series C | Jul 30, 2024 |  |
| Blackbird.AI | Blackbird.AI provides narrative and risk intelligence tools that deliver advanced AI-powered solutions in its mission to empower trust, safety, and integrity across the information ecosystem. The Blackbird Constellation Platform™ powers the detection and analysis of information-driven attacks, narrative manipulation, and threat evolution across adynamic adversarial environment. |  | Venture - Series Unknown | Jul 23, 2024 |  |
| RapidSOS | RapidSOS is a creator of an emergency response data platform that securely links life-saving data from 350M+ connected devices directly to 911 and first responders in an emergency. Through the platform, RapidSOS is providing intelligent data that supports over 4,800 Emergency Communications Centers, protecting 90%+ of people in the US, across 250million emergencies annually. Partnering with innovative companies certified as RapidSOS Ready, RapidSOS is striving to reach everyone. Together, RapidSOS is empowering a faster and smarter response by sending first responders critical data like your exact location, real-time health information, and crash data. RapidSOS is committed to creating a safer, stronger future where technology and people work seamlessly together to save lives. | $75M | Series C | Mar 05, 2024 |  |
| RapidSOS | RapidSOS is a creator of an emergency response data platform that securely links life-saving data from 350M+ connected devices directly to 911 and first responders in an emergency. Through the platform, RapidSOS is providing intelligent data that supports over 4,800 Emergency Communications Centers, protecting 90%+ of people in the US, across 250million emergencies annually. Partnering with innovative companies certified as RapidSOS Ready, RapidSOS is striving to reach everyone. Together, RapidSOS is empowering a faster and smarter response by sending first responders critical data like your exact location, real-time health information, and crash data. RapidSOS is committed to creating a safer, stronger future where technology and people work seamlessly together to save lives. | $75M | Series C | Sep 28, 2022 |  |
| Immuta | Immuta provides a cloud-native data governance platform for organizations to automate data access control, security, and privacy compliance, ensuring each user who queries data sees only the data they’re supposed to see, for their approved purpose or role. The platform aims to create trust across data engineering, security, legal, compliance, andbusiness teams so they can work together to ensure timely access to critical data with minimal risk while adhering to global data privacy regulations including the GDPR, CCPA, and HIPAA. | $100M | Series E | Jun 08, 2022 |  |
| ThriveDX | ThriveDX is a global education tech company specializing in cybersecurity and digital skills. | $80M | Venture - Series Unknown | Jan 27, 2022 |  |

10 of 29 investments shown.

## Co-investors
- [AllegisCyber](https://shizune.co/investors/profile/allegis-capital) — VC Fund, 8 deals together
- [Cisco Investments](https://shizune.co/investors/profile/cisco-investments) — VC Fund, 5 deals together
- [WestCap](https://shizune.co/investors/profile/westcap-sf) — VC Fund, 3 deals together
- [BAM Elevate](https://shizune.co/investors/profile/bam-elevate) — VC Fund, 2 deals together
- [EDBI](https://shizune.co/investors/profile/edbi) — VC Fund, 2 deals together
- [Francisco Partners](https://shizune.co/investors/profile/francisco-partners) — VC Fund, 2 deals together

## About Momentum Cyber

VC Fund · San Francisco, United States

Momentum Cyber is the premier trusted advisor to the cybersecurity industry providing bespoke high-impact advice combined with tailored, senior-level access. The firm was founded by world-class operators and advisors and caters to the unique needs of both earlier stage Founders, CEOs, & Boards as well as the complexity of later stage &public companies throughout their lifecycle – Incubation to Exit. Headquartered in San Francisco with operations globally, the founding team has closed over 250 transactions totaling over $250 billion in value. Momentum Cybersecurity Group, LLC conducts its M&A advisory services as an M&A Broker as defined by the SEC.

5 contacts available at Momentum Cyber.

| Name | Title | Profile |
| --- | --- | --- |
| David DeWalt | Executive Chairman & Founder | https://shizune.co/investors/profile/dave-dewalt |
| Dino Boukouris | Director & Founding Member | https://shizune.co/investors/profile/dino-boukouris |
| Eric McAlpine | Founder & Managing Partner | https://shizune.co/investors/profile/eric-mcalpine |
| Keith Skirbe | Director & Founding Member | https://shizune.co/investors/profile/keith-skirbe |
| Ken Gonzalez | Partner | https://shizune.co/investors/profile/ken-gonzalez |

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## FAQ

### What does David DeWalt invest in?

David DeWalt invests primarily in Cyber Security, Security and Software startups, most often at Series A and Series C stage. Most of the 29 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 David DeWalt last invest?

The most recent investment recorded for David DeWalt closed in Aug 2026. Shizune tracks 29 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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