Nir Polak
Angel Investor @ SignalFire
San Mateo, United States
Nir Polak is a Series A investor at SignalFire in San Mateo focused on Software and Cyber Security. Caleb Sima is the Founding General Partner and Builder of WhiteRabbit. He previously worked at Exabeam as Co-founder and Chairman of the Board. Caleb attended Reichman University, where he took Computer Science.
- Total investments:
- 10
- Last investment:
- Lead investor:
- 10%
Last updated:
For AI agents: llms.txt
Industries Nir Polak invests in
Stages Nir Polak invests in
Countries Nir Polak invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $8.5M–$53M
- Series A
- $15M–$34M
Investment Focus
Industry
- Software 6 (60%)
- Cyber Security 6 (60%)
- Network Security 3 (30%)
- Cloud Security 2 (20%)
- Information Technology 2 (20%)
Stage
- Series A 5 (50%)
- Seed 4 (40%)
Country
- United States 6 (60%)
- Israel 2 (20%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Clutch Security provide security teams with comprehensive, clear, and actionable tools for Non-Human Identity security. | $8.5M / Seed / Jul 30, 2024 | ||
| Nagomi is changing the way security teams balance risk and defense, empowering customers to focus on what matters now. By mapping customers’ existing security tools to the threats that matter and providing prescriptive remediation plans, the Nagomi Proactive Defense Platform finally makes it possible to optimize, measure, and maximize the ROI ofsecurity investments. By taking a threat-centered, data-driven, and actionable approach to risk and cybersecurity, customers are able to provide high-level cybersecurity maturity metrics to executives while simultaneously showing security practitioners exactly what to do to reduce risk, fix misconfigurations, and make strategic decisions with business context. Learn more at nagomi.security. | $23M / Series A / Apr 23, 2024 | ||
| Vorlon enables continuous near real-time detection and identification of third-party apps consuming your data. Our agentless patent-pending solution facilitates risk profiling of apps, and provides AI-driven behavioral analytics with response recommendations. | $15.7M / Series A / Apr 17, 2024 | ||
| Descope enables any developer to create secure, frictionless authentication and user journeys for any application. It intends to make customer identity a business enabler. | $53M / Seed / Feb 15, 2023 | ||
| Protect AI develops security solutions designed for machine learning and artificial intelligence systems. The company offers products that support AI scanning, large language model security, and generative AI red teaming within a unified platform. These tools integrate with existing AI and security workflows to help organizations monitor, test, andmanage risks associated with AI models. Protect AI also provides resources to implement MLSecOps practices and align with data security and privacy requirements. Its offerings are used by enterprises aiming to incorporate security throughout the AI lifecycle. | $13.5M / Seed / Dec 15, 2022 | ||
| Dig Security is a cloud data security startup that provides real-time visibility, control, and protection of data assets. Monitoring and detecting data exfiltration and policy violations has become a challenging problem with few, fragmented solutions as enterprises transition to complex settings with dozens of different database types acrossclouds. To help businesses better manage cloud data sprawl, Dig's cloud-native and entirely agentless methodology reinvents cloud DLP with DDR (Data Detection & Response) capabilities. | $34M / Series A / Sep 14, 2022 | ||
| Dig Security is a cloud data security startup that provides real-time visibility, control, and protection of data assets. Monitoring and detecting data exfiltration and policy violations has become a challenging problem with few, fragmented solutions as enterprises transition to complex settings with dozens of different database types acrossclouds. To help businesses better manage cloud data sprawl, Dig's cloud-native and entirely agentless methodology reinvents cloud DLP with DDR (Data Detection & Response) capabilities. | $11M / Seed / May 19, 2022 | ||
| Rumble brings together the best of IT, security and networking technology to deliver amazing network discovery and asset inventory capabilities for modern enterprises. | $15M / Series A / Mar 14, 2022 | ||
| Vicarius helps Security and IT teams protect their most critical apps and assets against software exploitation through vRx, a consolidated end-to-end vulnerability remediation platform that combines discovery, prioritization, and mitigation in a single platform. Backed by tier-one Silicon Valley investors, Vicarius was founded by security expertson a mission to provide problem-solving remediation solutions that proactively reduce risk wherever assets reside. Effortlessly find and eliminate threats while reducing the strain on internal security resources, freeing up personnel to focus on other mission-critical tasks without sacrificing security. Get started for free today or learn more at https://vicarius.ioVicarius was founded in 2016 by three entrepreneurs from the information-security industry and operates from headquarters in New York and Tel Aviv. | $24M / Series A / Feb 09, 2022 | ||
| See all 10 investments → | |||
Co-Investors
About SignalFire
SignalFire is a venture capital firm that invests in seed-stage companies and breakout companies. The company focuses on providing data-driven insights and tailored advisory programs across various sectors, including health, fintech, and cybersecurity.
SignalFire Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Chris Scoggins
Partner
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Elaine Zelby
Venture Partner
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Jim Stoneham
Partner
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Josh Constine
Principal investor and Head Of Content
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Alex Garden
Venture Partner
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FAQ
What does Nir Polak invest in?
Nir Polak invests primarily in Software, Cyber Security and Network Security startups, most often at Series A and Seed stage. Most of the 10 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What is Nir Polak's check size?
Nir Polak typically joins rounds of $8.5M–$53M at Seed and $15M–$34M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Nir Polak participates in.
How do I contact Nir Polak?
Public channels for Nir Polak include LinkedIn, X (Twitter) and the website linked on this profile. 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 Nir Polak last invest?
The most recent investment recorded for Nir Polak closed in Jul 2024. Shizune tracks 10 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 Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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