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 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