Arik Kleinstein
Founder and Managing Partner @ Glilot Capital Partners
Israel
Arik Kleinstein is a seed investor at Glilot Capital Partners in Israel focused on Cyber Security and Software. Arik is a co-founder and managing partner at Glilot Capital Partners. He has vast experience in the investment, financial and operational aspects of start-ups, including raising venture capital and turning companies public. Some of Arik’s past experience includes work at Jerusalem Global, a technology investment bank and venture capital firm, as well as financial leadership positions with Bank Hamizrachi, ECTel, VideoCodes Inc. (acquired by Thomson), and Intercure. Arik served in an R&D unit of the IDF Intelligence Corps and has a degree in Industrial Engineering and Management from the Technion, Israel Institute of Technology and an MBA from Tel Aviv University.
- Total investments:
- 35
- Last investment:
- Lead investor:
- 40%
Last updated:
For AI agents: llms.txt
Industries Arik Kleinstein invests in
Stages Arik Kleinstein invests in
Countries Arik Kleinstein invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $1.5M–$12M
- Series A
- $3M–$25M
- Series B
- $2M–$30M
Investment Focus
Industry
- Cyber Security 9 (26%)
- Software 6 (17%)
- Security 5 (14%)
- Network Security 4 (11%)
- SaaS 3 (9%)
Stage
- Seed 13 (37%)
- Series A 11 (31%)
- Series B 8 (23%)
- Series C 1 (3%)
- Convertible Note 1 (3%)
Country
- United States 10 (29%)
- Israel 5 (14%)
- Uruguay 1 (3%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Rein Security is an application security company delivering a novel, patent pending technology with real-time, in-production visibility and protection. Trusted by leading Fortune 500 companies, Rein Security enables security teams to prioritize which API, SCA and AI risks actually matter by correlating every request, response, resource, API andline of code in production. | $25M / Series A / Oct 08, 2026 | ||
| Niv-AI develops an AI platform that optimizes power usage in AI data centers by capturing real-time electricity consumption data and dynamically balancing workloads. It addresses bottlenecks where synchronized GPUs create sharp power spikes, unlocking up to 30% of stranded capacity without new hardware. | $12M / Seed / Mar 17, 2026 | ||
| Securing the Cloud is challenging and elusive. SaaS sprawl and expanding identity surfaces outpace traditional security tools. Preventive controls miss the mark on real-time detection. Visibility gaps grow. Attackers get in. Mitiga helps you fight back—faster. Our Cloud Detection and Response (CDR) platform accelerates response times by 90 percentand delivers full visibility across Identity, Cloud Infrastructure, SaaS and AI.Built by incident responders for incident responders, Mitiga is the only platform that connects all three layers—so you can detect threats earlier, contain lateral movement, and resolve incidents before they spread.With over 1,000 days of forensic log history and a powerful investigation workbench, Mitiga keeps your team ready to respond at any moment. No noise. No blind spots. No delay.Trusted by Fortune 500 enterprises. Easy to deploy. Designed for today’s cloud threats.Attacks will happen. What matters is how fast you bounce back. | $30M / Series B / Jan 21, 2025 | ||
| Entitle provides a framework for managing cloud rights, allowing access to cloud resources to be restricted. With the help of Entitle's SaaS-based platform, enterprises can establish effective cloud Least Privilege programs. It also eliminates provisioning-related bottlenecks and enables security teams to restrict unneeded access and establishgovernance while maintaining a seamless experience for employees. | $15M / Seed / Feb 22, 2023 | ||
| devOcean Technology Ltd is a Vancouver Island-based oceanographic tech support company. | $6M / Seed / Mar 12, 2022 | ||
| Cider Security is an AppSec Operating System that provides Security and Engineering teams a single, consistent method to orchestrate and implement end-to-end CI/CD security through a single, unified platform. The company takes a holistic approach to the security of the engineering processes and systems, from code to deployment. It establishesa comprehensive Technical DNA of the engineering environment, giving Security teams the transparency and visibility needed to optimize AppSec and achieve full resilience. Founded in late 2020 by cybersecurity industry veterans, Guy Flechter and Daniel Krivelevich, Cider Security’s mission is to solve the most commonly encountered challenges CISOs and security engineers face today. | $32M / Series A / Mar 07, 2022 | ||
| Cider Security is an AppSec Operating System that provides Security and Engineering teams a single, consistent method to orchestrate and implement end-to-end CI/CD security through a single, unified platform. The company takes a holistic approach to the security of the engineering processes and systems, from code to deployment. It establishesa comprehensive Technical DNA of the engineering environment, giving Security teams the transparency and visibility needed to optimize AppSec and achieve full resilience. Founded in late 2020 by cybersecurity industry veterans, Guy Flechter and Daniel Krivelevich, Cider Security’s mission is to solve the most commonly encountered challenges CISOs and security engineers face today. | $6M / Seed / Mar 07, 2022 | ||
| CardinalOps is a network security company that provides AI threat detection for enterprises. The company's AI and automation are used in the SaaS platform to maximize MITRE ATT&CK coverage for the existing security stack and eliminate hidden detection gaps. Detection engineers are still using spreadsheets and lists to manage their SIEM andSOC detection tools, although they are dealing with increasing attacker sophistication and constant change in their complex IT infrastructures.The platform continuously delivers new use cases by leveraging proprietary analytics and API-driven automation, allowing your SOC team to stay ahead of constant change in the attack surface and threat landscape - as well as continuously identify and remediate broken rules and misconfigured log sources. | $17.5M / Series A / Mar 03, 2022 | ||
| Genoox develops and provides a cloud based big data platform for storing and managing genomic data. Its platform allows medical experts to provide genetic diagnostics and personalized treatments to their patients. Amir Trabelsi and Moshe Einhorn founded Genoox in 2014, with its headquarters in Palo Alto in California. | $8M / Series B / Feb 01, 2021 | ||
| CardinalOps is a network security company that provides AI threat detection for enterprises. The company's AI and automation are used in the SaaS platform to maximize MITRE ATT&CK coverage for the existing security stack and eliminate hidden detection gaps. Detection engineers are still using spreadsheets and lists to manage their SIEM andSOC detection tools, although they are dealing with increasing attacker sophistication and constant change in their complex IT infrastructures.The platform continuously delivers new use cases by leveraging proprietary analytics and API-driven automation, allowing your SOC team to stay ahead of constant change in the attack surface and threat landscape - as well as continuously identify and remediate broken rules and misconfigured log sources. | $6.5M / Seed / Jan 21, 2021 | ||
| See all 35 investments → | |||
Co-Investors
About Glilot Capital Partners
Glilot Capital Partners is a venture capital firm founded by entrepreneurs with a solid success record and with the aim of accelerating the success of those starting out. The firm's early growth fund focuses on post-Series A startups in the enterprise software and cybersecurity sectors. They seek to provide flexible funding solutions by leading or participating in early growth rounds and offering convertible notes. Glilot+ includes a large community of industry leaders, strong financial backing, and extensive resources to drive the growth of their business. Glilot Capital Partners was founded in 2011 by Kobi Samboursky and Arik Kleinstein and is headquartered in Herzliya, Tel Aviv, Israel.
Glilot Capital Partners Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Alon Leibovich
Capital Member
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Arik Kleinstein
Founder and Managing Partner
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Avinoam Nowogrodski
Member
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Boris Vanyberg
Member
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Chad Kinzelberg
Executive Advisor
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FAQ
What does Arik Kleinstein invest in?
Arik Kleinstein invests primarily in Cyber Security, Software and Security startups, most often at Seed and Series A stage. Most of the 35 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What round sizes does Arik Kleinstein invest in?
Arik Kleinstein typically joins rounds of $1.5M–$12M at Seed, $3M–$25M at Series A and $2M–$30M at Series B. These are whole funding-round sizes, not Arik Kleinstein's own check, which is rarely disclosed: the 10th–90th percentile of the confirmed public funding rounds Arik Kleinstein took part in.
How do I contact Arik Kleinstein?
Public channels for Arik Kleinstein 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 Arik Kleinstein last invest?
The most recent investment recorded for Arik Kleinstein closed in Oct 2026. Shizune tracks 35 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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