Arena Secures $200 Million In Series B Funding Led By Investors Including Lightspeed Venture Partners
Arena, an AI safety and evaluation company, raised $200 million in Series B funding at a $3.1 billion valuation, bringing its focus to measuring how safely and effectively AI systems perform in real-world use. Led by…
Arena, an AI safety and evaluation company, raised $200 million in Series B funding at a $3.1 billion valuation, bringing its focus to measuring how safely and effectively AI systems perform in real-world use. Led by CEO Anastasios Angelopoulos, Arena also launched its Alignment Index, which evaluates frontier models using real-world agent traces across signals including unauthorized action, false attribution and deceptive completion.
FOUNDERS: Anastasios Angelopoulos, Wei-Lin Chiang & Ion Stoica
INVESTORS: Lightspeed Venture Partners, Khosla Ventures, Salesforce Ventures, 01 Advisors, Dell Technologies Capital, Endeavor Catalyst, Andreessen Horowitz (a16z), Felicis, AMP PBC, QuantumLight & The House Fund
ROUND: Series B AMOUNT: $200,000,000 VALUATION: $3,100,000,000
HQ: San Francisco, California
#VentureCapital #Arena #AnastasiosAngelopoulos #LightspeedVenturePartners #TradedVC
ABOUT THE DEAL
- Raise
- $200M
- Round
- Series B
- Company
- Arena
- Desk
- Deals
- Filed
- Oct 8, 2026
- Founders
- Anastasios Angelopoulos
- Wei-Lin Chiang
- Ion Stoica
- Investors
- Lightspeed Venture Partners
- Khosla Ventures
- Salesforce Ventures
- 01 Advisors
- Dell Technologies Capital
- Endeavor Catalyst
- Andreessen Horowitz (a16z)
- Felicis
- AMP PBC
- QuantumLight
- The House Fund
