# Ariel Tseitlin

> Ariel Tseitlin is a Series C investor at Scale Venture Partners backing Software. See 37 investments, check sizes, portfolio and contact details. Updated Oct…

- Type: Angel Investor
- Fund: [Scale Venture Partners](https://shizune.co/investors/profile/scale-venture-partners)
- Location: Foster City, United States
- Total investments: 37
- Last investment: Dec 2025
- Lead investor: 51%
- Last updated: Oct 2026
- LinkedIn: https://www.linkedin.com/in/atseitlin
- X (Twitter): http://twitter.com/atseitlin
- Facebook: https://www.facebook.com/ariel.tseitlin

Ariel Tseitlin is a Series C investor at Scale Venture Partners in Foster City focused on Software and Cyber Security. Ariel Tseitlin is the Partner at Scale Venture Partners.

## Contacts

5 contacts available for Ariel Tseitlin: 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/ariel-tseitlin?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 8 | 22% |
| Cyber Security | 8 | 22% |
| Security | 5 | 14% |
| Analytics | 5 | 14% |
| Cloud Security | 5 | 14% |

30 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series C | 11 | 30% |
| Series B | 8 | 22% |
| Series D | 8 | 22% |
| Series A | 5 | 14% |
| Series E | 2 | 5% |

6 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 16 | 43% |
| Israel | 1 | 3% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Prime Security | Identify, prioritize, and mitigate security on risk before development starts. | $20M | Series A | Dec 09, 2025 | https://primesec.ai/ |
| ClearVector | ClearVector is an identity-driven cloud security company providing organizations with tools to prepare for, measure, and prevent the impact of cyberattacks and breaches. | $13M | Series A | May 13, 2025 | https://www.clearvector.com |
| Lumos | Lumos is an IT company that provides secure management processes. They offer SaaS management and access management services. Additionally, they provide flexible workflows and spend management solutions. | $35M | Series B | May 23, 2024 | https://lumosidentity.com |
| System Initiative | System Initiative is a new kind of application platform to deploy and run applications anywhere with ease and confidence. | $15M | Series A | Jun 21, 2023 | https://www.systeminit.com/ |
| Vantage | Vantage is a service that helps businesses analyze and reduce their AWS costs. Vantage's mission is to build a suite of tools that make it easy for engineering, leadership, and finance to analyze, collaborate on and optimize their cloud infrastructure costs. | $21M | Series A | Mar 07, 2023 | https://www.vantage.sh/ |
| Loops | Loops is a no-code analytics platform that provides product and data teams with growth opportunities hidden in their data. | $10M | Seed | Nov 15, 2022 | https://getloops.ai/ |
| Expel | Expel is a SOC-as-a-service platform that provides security monitoring and response for cloud, hybrid, and on-premises environments. Expel use the security signals its customers already own so organizations can get more value from their existing security investments. It connects to customer tech remotely through APIs, not agents, so its SOC canstart monitoring a customer’s environment in a matter of hours, letting their internal teams get back to focusing on the most strategic security priorities that are unique to their business.The company was founded in 2016 and is headquartered in Herndon, Virginia. | $31M | Series E | Oct 03, 2022 | http://www.expel.io/ |
| AppOmni | AppOmni is a leading provider of SaaS Security Management software. The company was founded by a team of security veterans from top SaaS providers and cybersecurity vendors, and its customer base includes global leaders across technology, healthcare, banking, and finance as well as many of the most well-known cybersecurity providers.Its patentedtechnology scans APIs, security controls, and configuration settings to compare the current state of enterprise SaaS deployments against best practices and business intent. The solution offers fast deployment, instant visibility, and makes it easy for security and IT teams to secure their entire SaaS environment from each vendor to every end-user. As SaaS applications evolve, AppOmni stays current with all updates and releases to keep customer environments secure over time.Co-founders Brendan O'Connor and Brian Soby headquartered AppOmni in San Francisco, California in 2018. | $70M | Series C | Jun 06, 2022 | https://appomni.com/ |
| Expel | Expel is a SOC-as-a-service platform that provides security monitoring and response for cloud, hybrid, and on-premises environments. Expel use the security signals its customers already own so organizations can get more value from their existing security investments. It connects to customer tech remotely through APIs, not agents, so its SOC canstart monitoring a customer’s environment in a matter of hours, letting their internal teams get back to focusing on the most strategic security priorities that are unique to their business.The company was founded in 2016 and is headquartered in Herndon, Virginia. | $140.3M | Series E | Nov 18, 2021 | http://www.expel.io/ |
| Honeycomb | Honeycomb provides full-stack observability for modern engineering teams to understand, debug, and improve production systems. Honeycomb's customers rely on the product for fast incident response, system optimization, and delivering pain-free releases across the software engineering cycle that translates to happy devs and happy customers.Founded on the experience of debugging problems at the scale of millions of apps serving tens of millions of users, it helps every engineer to the instrument and queries the behavior of their system.The company was founded in 2016 and is based in San Francisco, California. | $50M | Series C | Oct 20, 2021 | https://www.honeycomb.io/ |

10 of 37 investments shown.

## Co-investors
- [.406 Ventures](https://shizune.co/investors/profile/406-ventures) — VC Fund, 6 deals together
- [Battery Ventures](https://shizune.co/investors/profile/battery-ventures) — VC Fund, 6 deals together
- [ClearSky](https://shizune.co/investors/profile/clear-sky) — VC Fund, 6 deals together
- [Bessemer Venture Partners](https://shizune.co/investors/profile/bessemer-venture-partners) — VC Fund, 5 deals together
- [Headline](https://shizune.co/investors/profile/headlinevc) — VC Fund, 5 deals together
- [Paladin Capital Group](https://shizune.co/investors/profile/paladin-capital-group) — VC Fund, 5 deals together

## About Scale Venture Partners

VC Fund · Foster City, United States

Scale Venture Partners is a seed-stage venture capital firm focused on intelligent business software with a Scaling Platform that has helped companies like Box, Bill.com, Hubspot, Docusign, JFrog, and WalkMe move from founder-led growth to a repeatable go-to-market machine. ScaleVP partners with entrepreneurs to support accelerated growth from thefirst customer to market leadership.

5 contacts available at Scale Venture Partners.

| Name | Title | Profile |
| --- | --- | --- |
| Jeremy Kaufmann | Senior Associate | https://shizune.co/investors/profile/jeremy-kaufmann |
| Alexander Niehenke | Partner | https://shizune.co/investors/profile/alexander-niehenke |
| Andy Vitus | Partner | https://shizune.co/investors/profile/andy-vitus |
| Ariel Tseitlin | Partner | https://shizune.co/investors/profile/ariel-tseitlin |
| Becca Chambers | CMO | https://shizune.co/investors/profile/becca-chambers-1c21 |

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## FAQ

### What does Ariel Tseitlin invest in?

Ariel Tseitlin invests primarily in Software, Cyber Security and Security startups, most often at Series C and Series B stage. Most of the 37 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 Ariel Tseitlin?

Public channels for Ariel Tseitlin include LinkedIn, X (Twitter) and Facebook. 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 Ariel Tseitlin last invest?

The most recent investment recorded for Ariel Tseitlin closed in Dec 2025. Shizune tracks 37 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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