AI assistant startup Instinct raises $250M Series B at $2.5B valuation while still in private beta

Instinct, an AI assistant from Spear Street Technology founded by 23-year-old Noah Shinn in 2025, raised $250 million in a Series B co-led by Index Ventures and Benchmark, with Conviction Partners participating. The round brings total funding to $350 million at a $2.5 billion valuation. The product remains in private beta and has already drawn user privacy and security concerns.