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Arena closes $200M Series B at $2.88B valuation to advance AI evaluation and launches Alignment Index for agent safety.
Amount Raised
$200 Million
Round Type
Series B
TolentinoSportsFashionInvestors
Description
Arena, the AI evaluation startup behind a prominent AI leaderboard, has closed a $200 million Series B round at a $2.88 billion post-money valuation on September 22, 2026. The funding brings Arena's total capital raised to approximately $450 million. Key investors backing the round include Andreessen Horowitz, Felicis, UC Investments, Kleiner Perkins, and Lightspeed. Weeks after closing the Series B, Arena launched its Alignment Index, a benchmark designed to measure AI agent safety and alignment based on over 90,000 agent sessions across 27 models.
Fundz sees it the moment Arena SpA raises, hires an exec or expands, usually minutes after it happens, and tells you who to reach.
Funding Insights
What this usually meansArena SpA raised. Fundz records a round at a median of 3.6 minutes from the SEC filing, with the decision-maker attached.
145 of these a day, filtered to the companies you pick, with the decision-maker attached.
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