Fundraising FoxNucleus Security
Sarasota, US · Founded 2019 · Delaware corporation · 6 known investors
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Nucleus Security offers a unified exposure management platform that consolidates security data from 200+ sources, prioritizes vulnerabilities with threat intelligence, and automates remediation workflows. It serves large enterprises, federal, state, and local government agencies, and government contractors in the cybersecurity industry.
Founders & leadership
Nucleus Security was founded in 2019 by Steve Carter and Scott Kuffer.
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Steve CarterCo-founder & CEOSteve Carter is co-founder and CEO of Nucleus Security, a vulnerability management platform that aggregates security data and automates remediation workflows for large enterprises and government agencies.
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Scott KufferCo-Founder | Chief Product OfficerCo-founder and Chief Product Officer of Nucleus Security, which provides vulnerability management and exposure consolidation solutions for enterprises and government agencies.
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NICHOLAS FLEMINGNamed on SEC filing
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MICHAEL NIXONNamed on SEC filing
Board
RK
Investors · 6
Arthur Ventureslisted by Arthur VenturesMinneapolis · $1M – $10M
How we know: Arthur Ventures's portfolio page · a partner's Signal profile · funding news · nucleussec.com · the VCSheet dataset · Not right? Tell us
Aviso Ventureslisted by Aviso VenturesSeattle
How we know: Aviso Ventures's portfolio page · Not right? Tell us
Delta-v Capitallisted by Delta-v CapitalDenver · $2M – $10M
How we know: Delta-v Capital's portfolio page · funding news · nucleussec.com · Not right? Tell us
In-Q-Tellisted by In-Q-TelTysons · $100K – $2.5M
How we know: In-Q-Tel's portfolio page · Not right? Tell us
Lead Edge CapitalreportedNew York · $50M – $400Mvia Avery Rosin · board
How we know: a partner's Signal profile · board seat on SEC Form D · funding news · Not right? Tell us
Funding
SEC filings, press & company announcements$86.8M disclosed across 4 rounds · 2021–2026
- $20MSeries CFeb 2026 · 2 sources
Delta-v Capital (lead), Arthur Ventures
Source ↗ - $43MSeries BFeb 2024 · 2 sourcesSource ↗
▶$20.3MraisedMar 2022 · 3 investors · Other TechnologyRule 506(b)
▶$20.3MraisedMar 2022 · 3 investors · Other Technology
Rule 506(b)Officers, directors & promoters on the filing
- Avery RosinDirector
- Michael NixonDirector
- Ryan KruizengaDirector
- Scott KufferDirector
- Stephen CarterExecutive Officer, Director
- Offering amount
- $20.3M
- Amount sold
- $20.3M
- First sale
- Mar 2022
- Incorporated
- Corporation, Delaware, 2019
- Federal exemptions
- 06b
▶$3.5MraisedMar 2021 · 4 investors · Other TechnologyRule 506(b)
▶$3.5MraisedMar 2021 · 4 investors · Other Technology
Rule 506(b)Officers, directors & promoters on the filing
- NICHOLAS FLEMINGDirector
- MICHAEL NIXONDirector
- RYAN KRUIZENGADirector
- STEPHEN CARTERExecutive Officer, Director
- SCOTT KUFFERDirector
- Offering amount
- $3.5M
- Amount sold
- $3.5M
- Proceeds to insiders
- $600K
- First sale
- Feb 2021
- Incorporated
- Corporation, Delaware, 2019
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
Founder mafia
2 people who came through Nucleus Security went on to found or lead other companies.
Related companies · 10
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UpguardUpGuard provides a platform for managing cybersecurity risk, including third-party vendor and supply chain risk assessment. It is aimed at organizations seeking to evaluate and monitor the security posture of their vendors.
CyCognitoCyCognito provides an external attack surface management (ASM) platform that continuously discovers, tests, and prioritizes exposures across an organization's internet-facing assets, subsidiaries, and third-party connections. It serves enterprise security teams with automated asset discovery, autonomous security testing (including DAST and vulnerability scanning), risk prioritization, and remediation workflows.
Companies working in the same space as Nucleus Security.
Non-dilutive funding · 1 SBIR/STTR award
Federal grants — no equity taken| Agency | Phase | Year | Amount |
|---|---|---|---|
| U.S. Air ForceAir Force | Phase I | 2021 | $48.7K |
Source: SBIR.gov award data (U.S. Small Business Administration). SBIR/STTR awards are competitive federal R&D grants and contracts — non-dilutive capital alongside any venture rounds above.
In the news
Frequently asked questions
- What does Nucleus Security do?
- Nucleus Security offers a unified exposure management platform that consolidates security data from 200+ sources, prioritizes vulnerabilities with threat intelligence, and automates remediation workflows. It serves large enterprises, federal, state, and local government agencies, and government contractors in the cybersecurity industry.
- Who founded Nucleus Security?
- Nucleus Security was founded by Steve Carter, Scott Kuffer in 2019.
- Who are Nucleus Security's investors?
- Nucleus Security's investors include Arthur Ventures, Aviso Ventures, Dcode Capital, Delta-v Capital, In-Q-Tel, Lead Edge Capital.
- How much funding has Nucleus Security raised?
- Nucleus Security has disclosed $86.8M raised across 4 rounds.
- Where is Nucleus Security headquartered?
- Nucleus Security is headquartered in Sarasota, US.