Guy Horowitz

Partner @ 33N Ventures

📍 Menlo Park, California, United States🔄 Updated September 2026💼 32 investments📅 11 years investing🗓 Last invested Mar 2026𝕏 @upgrade_to_unlock
VC🌍 United States20+ investmentsInvested this year
32
Total investments
12
Early stage
7
Mid stage
3
Late stage
11y
Years active

Portfolio

29 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Investor
Mar 2026
The endpoint is the epicenter of work in the age of AI. Its where people think, create, and drive the business forward. And with that momentum, risk is inevitable. Yet its also where organizations have the least visibility and control. For years, security teams have tried to close that gap with more tools - but legacy solutions bury teams in alerts, demand endless tuning, and still miss real risks. Bold changes that. Our lightweight AI security agent runs directly on the endpoint - classifying data, understanding user behavior, and enforcing protection in real time. No cloud processing. No configuration. No privacy tradeoffs. Backed by $40M in funding from Bessemer Venture Partners, Picture Capital, and Red Dot Capital Partners.
Investor
Sep 2025
Apono, led by cybersecurity and DevOps experts. “Apono” is the Hawaiian word for “approve”. The Apono platform is loved by DevOps, trusted by Security - supports customers like OpenWeb, Cybereason, HiredScore, Tomorrow.io and many more in automating permission management. Providing a frictionless experience for users with the visibility and compliance needed by security to win more business. Apono helps customers move to zero standing, just in time permissions, get started in minutes at https://www.apono.io
Investor
May 2025
Managed security services, rebuilt for SecOps. Traditional MDR can’t keep up with modern threats. AI SOC tools help with investigations, but still require a SOC team. Daylight introduces Managed Agentic Security Services (MASS), a new model where AI agents and security experts run your security operations together.
Investor
Mar 2025
On a mission to deliver the most secure and continuous identity platform for the AGI era—built for humans and agents everywhere.
Investor
Mar 2025
Huskeys is pioneering a new category: Edge Security Management (ESM). We’ve built an agentic AI layer across the entire edge security stack- unifying CDN-WAF-Infra-App, into a single, continuously adaptive system. For years, organizations have struggled with a painful reality: WAFs are powerful, but complex, noisy, and resource-intensive. Managing them is difficult, outcomes are inconsistent, and the operational burden is high. We gave up on trying to make it effective. Huskeys solves this. Our AI continuously assesses, adapts, and orchestrates rules, policies, and configurations - optimizing for both security and business outcomes. The result: your existing WAF becomes effective, transparent, and economically impactful. Less noise. Fewer false positives. Reduced manual overhead. And significant cost savings - often in the millions. Huskeys transforms edge security from a fragmented, reactive challenge into a unified, intelligent, and outcome-driven system. We are Huskeys and we clear the WAF way.
Investor
Mar 2025
Noma Security is the agentic AI security platform giving enterprise organizations the confidence to rapidly build AI applications and adopt AI agents at scale. Noma Security uniquely provides cybersecurity teams with control of AI risk through continuous AI discovery and inventory, AI supply chain security, AI red teaming, and AI runtime protection to ensure compliance and risk mitigation. Backed by Ballistic Ventures, Glilot Capital, Cyber Club London, Databricks Ventures and SVCI, Noma Security is widely adopted by Fortune 500 customers and has been recognized by Gartner as a leading AI TRiSM solution.
Investor
Feb 2025
Astelia is an AI-native exposure management platform that enables organizations to focus exclusively on vulnerabilities that are truly reachable and exploitable in their environment. By mapping real network topology and applying agentic AI to analyze exploit requirements, Astelia replaces vulnerability guesswork with predictive analysis. It eliminates noise, surfaces the ~1% of vulnerabilities that actually represent real exposure, and delivers evidence-based remediation guidance beyond patching. The result is faster, more practical mitigation that aligns security and IT while saving time and resources.
Investor
May 2024
Click. Connect. Get paid from your enterprise customers. We built Monto for all the revenue teams tired of dealing with endless customer A/P portals. Monto is the first platform that connects with every payment portal, like Ariba and Coupa, and learns each of your customers’ billing requirements, so you can send, track, and collect invoices — from one place, in one click, with no manual work. So far, innovation in B2B payments has focused on customers. This makes payments easier for them to send, but harder for suppliers to receive. To create a world where B2B payments are truly seamless, we need it to be easy for both parties. We need connectivity. We need flexibility. We need platforms that can plug the gap between the portals customers are using, and the systems suppliers have. We need Monto.
Investor
Feb 2024
Mesh Security is the CSMA (Cybersecurity Mesh Architecture) platform for enterprise-wide visibility and control. Security failures rarely happen because tools are missing. They happen because real exposure is invisible. Mesh continuously reveals posture risks, detection gaps, and real attack paths across the enterprise, and helps eliminate the exposures that materially impact the business.
Investor
Jun 2023
We build home offices in your backyard to give you more space to live and work.
mid stageConstruction
Investor
Mar 2023
We’re Nominal — the agentic AI platform built for modern finance. Nominal helps finance teams automate financial consolidation, intercompany eliminations, reconciliations, and reporting across complex, multi-entity structures — without changing their GL or ERP setup. Our AI agents handle the work spreadsheets weren’t built for, from revenue and accrual workflows to period-end processes. Nominal integrates directly with your systems and is up and running in days — no engineering required.
Investor
Jan 2023
Cynomi is the agentic Security Growth Platform built for MSPs, MSSPs, and vCISO consultancies. Powered by embedded CISO Intelligence with the decision-making logic of an experienced security leader built directly into every workflow, Cynomi enables service providers to deliver, scale, and grow cybersecurity services across every client and every maturity level. With Cynomi, service providers can: - Position yourself as the long-term security program owner, not the team that “helps with audits” - Productize Cyber Advisory, vCISO, and CISO-as-a-Service into scalable, high-margin offerings - Move from customized, one-off compliance projects to structured, recurring GRC revenue - Replace reactive audit prep with continuous compliance across multiple frameworks - Standardize delivery so junior team members execute like experienced security leaders - Manage security posture and risk across your entire client base through a single operating model - Turn client risk gaps into clearly defined, monetizable service expansions - Deliver measurable time-to-value in hours — not months - Prove strategic impact with executive-ready reporting that shows progress, risk reduction, and ROI By combining complete security program management with portfolio-level revenue insights, Cynomi transforms cybersecurity into a repeatable, profitable growth engine — improving margins, increasing operational efficiency, strengthening client trust, and driving sustainable growth. Book a demo: https://cynomi.com/request-a-demo/ Join our weekly MSP Growth Community Call at 12noon ET on Wednesdays: https://cynomi.com/webinars/cynomi-msp-growth-community/ #ProtectEveryClient
Investor
Jan 2023
Opus Security set out to transform vulnerability management by bringing automation and intelligence into one of the hardest problems in cybersecurity: remediation. Our platform was built around a fleet of AI-driven security agents designed to analyze, prioritize, and remediate vulnerabilities at scale. By embedding expertise into existing IT, engineering, and security workflows, Opus aimed to remove manual bottlenecks and make vulnerability management proactive, continuous, and seamless. The mission was simple: reduce backlog, eliminate wasted cycles, and help organizations stay ahead of risk with always-on security operations.
Investor
Oct 2022
Digma is a new Continuous Feedback platform that provides developers with the data they need to own their code all the way to production. By analyzing existing observability sources (logs traces and metrics), Digma gleans critical insights on performance, errors, and usage which can be leveraged to improve code, identify hotspots and bottlenecks, and assess code changes impact. For faster feedback cycles, Digma provides code insights right in the IDE and integrates with GitOps tools.
Show all 29 investments ↓
Experience · 36 entries
All (36)
Investments (32)
Board (7)
2026
Investor
Mar 2026
The endpoint is the epicenter of work in the age of AI. Its where people think, create, and drive the business forward. And with that momentum, risk is inevitable. Yet its also where organizations have the least visibility and control. For years, security teams have tried to close that gap with more tools - but legacy solutions bury teams in alerts, demand endless tuning, and still miss real risks. Bold changes that. Our lightweight AI security agent runs directly on the endpoint - classifying data, understanding user behavior, and enforcing protection in real time. No cloud processing. No configuration. No privacy tradeoffs. Backed by $40M in funding from Bessemer Venture Partners, Picture Capital, and Red Dot Capital Partners.
2025
Investor
Sep 2025
Apono, led by cybersecurity and DevOps experts. “Apono” is the Hawaiian word for “approve”. The Apono platform is loved by DevOps, trusted by Security - supports customers like OpenWeb, Cybereason, HiredScore, Tomorrow.io and many more in automating permission management. Providing a frictionless experience for users with the visibility and compliance needed by security to win more business. Apono helps customers move to zero standing, just in time permissions, get started in minutes at https://www.apono.io
Investor
May 2025
Managed security services, rebuilt for SecOps. Traditional MDR can’t keep up with modern threats. AI SOC tools help with investigations, but still require a SOC team. Daylight introduces Managed Agentic Security Services (MASS), a new model where AI agents and security experts run your security operations together.
Investor
Mar 2025
On a mission to deliver the most secure and continuous identity platform for the AGI era—built for humans and agents everywhere.
Investor
Mar 2025
Huskeys is pioneering a new category: Edge Security Management (ESM). We’ve built an agentic AI layer across the entire edge security stack- unifying CDN-WAF-Infra-App, into a single, continuously adaptive system. For years, organizations have struggled with a painful reality: WAFs are powerful, but complex, noisy, and resource-intensive. Managing them is difficult, outcomes are inconsistent, and the operational burden is high. We gave up on trying to make it effective. Huskeys solves this. Our AI continuously assesses, adapts, and orchestrates rules, policies, and configurations - optimizing for both security and business outcomes. The result: your existing WAF becomes effective, transparent, and economically impactful. Less noise. Fewer false positives. Reduced manual overhead. And significant cost savings - often in the millions. Huskeys transforms edge security from a fragmented, reactive challenge into a unified, intelligent, and outcome-driven system. We are Huskeys and we clear the WAF way.
Show all 36 entries ↓
Investment activity
2015–2026 · 32 investments
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