Nucleus Security
PrivateLast Round
Series C
Feb 11, 2026
Est. Valuation
$100M
Total Funding Raised
$86.6M
Momentum
Top 10%
of companies Caplight tracks
Company Overview
Nucleus Security operates in Cybersecurity and is based in Sarasota, Florida. Its latest recorded funding round was a Series C round in February 2026.
Nucleus Security is a cybersecurity company that provides a risk-based vulnerability and exposure management platform to unify asset, vulnerability, and threat data for enterprises and government agencies.
Sector
Cybersecurity
Verticals
Vulnerability Management, Compliance & Risk, Workflow Automation
Business Model
B2B
Customer Profile
Subscription SaaS
AI Layer
Application
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Nucleus Security Comparables
Compare Nucleus Security with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Zafran Security | 87% | |
| ArmorCode | 86% | |
| Brinqa | 86% |
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Nucleus Security Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series C | Feb 11, 2026 | ||||
| Corporate Funding | Aug 20, 2024 | ||||
| Series B Extension | Feb 12, 2024 | ||||
| Accelerator | Apr 19, 2023 | ||||
| Series B | Mar 23, 2022 | ||||
Series A | Mar 3, 2021 |
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Key People
Founding team and executive leadership
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Nucleus Security Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Arthur Ventures | Series B, Series C, Series A, Series B Extension |
| Lead Edge Capital | Series B, Series B Extension |
| Y Combinator | Accelerator |
| Delta-v Capital | Series C |
| In-Q-Tel | Series B Extension |
| Dcode Capital | Corporate Funding |
Market signals
Structured signals derived from secondary market and firmographic data.
- Sep 11, 2026
Monthly visitors grew 36% MoM to 36.5K.
- Mar 26, 2026
Named Best Vulnerability Management Solution in SC Awards for second consecutive year.
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Recent news
Latest coverage and updates
- launchesAug 25, 2026
On Aug 25th '26, Nucleus Security, Inc launches Nucleus Helix, an AI engine that sits at the center of its exposure management platform; its Insights expansion is available now, while Discover and the Helix AI Agent arrive in Sep '26.
- attends_eventAug 4, 2026
Nucleus Security, Inc attends BlackHat USA 2026 in Nevada on Aug 4th '26, where it is named a finalist for the Top InfoSec Innovator Awards and the Top 25 Most Innovative Cybersecurity Companies in the World 2026.
- recognized_asAug 4, 2026
During Black Hat USA 2026 in Nevada on Aug 4th '26, Nucleus Security, Inc is named a finalist in both the Top InfoSec Innovator Awards and Top 25 Most Innovative Cybersecurity Companies in the World 2026 by Cyber Defense Magazine, with judging continuing through October 2026.
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Nucleus Security Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
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Frequently Asked Questions
Common questions about Nucleus Security's valuation, stock price, and market status.
Is Nucleus Security a public or private company?
Nucleus Security is a private company.
What is the current stock price of Nucleus Security?
Nucleus Security is a private company, so its shares have no public market price. Caplight tracks Nucleus Security's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Nucleus Security worth (valuation)?
Nucleus Security's valuation is estimated at $100.0M based on funding round data.
Can I buy Nucleus Security stock?
Nucleus Security shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Nucleus Security's last funding round?
Nucleus Security's most recent funding round was Series C on February 11, 2026.
Who are the main investors in Nucleus Security?
Key investors in Nucleus Security include Arthur Ventures, Lead Edge Capital, Y Combinator, Delta-v Capital, Dcode Capital.
Will Nucleus Security IPO soon?
No public IPO plans have been announced for Nucleus Security.
How can I track Nucleus Security secondary market activity?
Caplight tracks bids, offers, and trades in Nucleus Security's shares on secondary markets.