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Simspace
Boston, US · Founded 2015 · Delaware corporation · 195 employees on LinkedIn · 4 known investors
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SimSpace provides a cyber range platform where security teams train, test, and operationalize AI agents and human analysts in a realistic digital replica of their production environment. Its AI Proving Grounds lets teams continuously stress-test agentic SOC defenses against LLM-based threats.
Founders & leadership
Simspace was founded in 2015 by William Edward Hutchison, Jr., Lee Milhem Rossey, and William "Hutch" Hutchison.
WE
William Edward Hutchison, Jr.Co-founder
LM
Lee Milhem RosseyChief Technology Officer & Co-Founder
JG
James GerberChief Financial Officer2022–2024James Gerber was CFO of SimSpace, a cybersecurity training platform provider, and previously held financial leadership roles at IronNet Cybersecurity and Lakeland Holdings, where he oversaw capital raises and strategic growth initiatives. He holds a CISSP cybersecurity certification and has served on boards including Princeton University and the Center for Information Technology Policy.
Board
JR
Investors · 4
Communitas Capital Partnerslisted by Communitas Capital PartnersNew York
How we know: Communitas Capital Partners's portfolio page · finance.yahoo.com · Not right? Tell us
L2 Point Managementreported
How we know: finance.yahoo.com · Not right? Tell us
Also in the syndicate · 1
BTG Pactual U.S. Private Credit Investments
Funding
SEC filings, press & company announcements$82.1M disclosed across 2 rounds · 2023–2025
- $39MraisedOct 2025 · 2 sources
BTG Pactual U.S. Private Credit Investments, Communitas Capital, L2 Point Management
Source ↗
▶$43.1MraisedDec 2023 · 6 investors · Other TechnologyRule 506(b)
▶$43.1MraisedDec 2023 · 6 investors · Other Technology
Rule 506(b)Officers, directors & promoters on the filing
- Jason RottenbergDirector
- James GerberExecutive Officer
- William Edward Hutchison, Jr.Executive Officer, Director
- Lee Milhem RosseyExecutive Officer, Director
- Offering amount
- $55M
- Amount sold
- $43.1M
- Sales commissions
- $1.7M
- Placement agents
- Bayshore Partners, LLC
- First sale
- Dec 2023
- Incorporated
- Corporation, Delaware
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
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In the news
Frequently asked questions
- What does Simspace do?
- SimSpace provides a cyber range platform where security teams train, test, and operationalize AI agents and human analysts in a realistic digital replica of their production environment. Its AI Proving Grounds lets teams continuously stress-test agentic SOC defenses against LLM-based threats.
- Who founded Simspace?
- Simspace was founded by William Edward Hutchison, Jr., Lee Milhem Rossey, William "Hutch" Hutchison in 2015.
- Who are Simspace's investors?
- Simspace's investors include Communitas Capital Partners, Arsenal, L2 Point Management.
- How much funding has Simspace raised?
- Simspace has disclosed $82.1M raised across 2 rounds.
- Where is Simspace headquartered?
- Simspace is headquartered in Boston, US.