Instinct, officially Spear Street Technology Inc., raised a $1 billion Series C at a $10 billion valuation announced Sept. 28, 2026, a follow-on round one month after its $250 million round at a $2.5 billion valuation co-led by Index Ventures and Benchmark. The Series C was joined by Sequoia Capital, Benchmark Capital and Coatue. Still in early access, the company is developing an everyday personal AI assistant for autonomous tasks including road-trip planning, grocery ordering, and phone concierge services such as reservations, appointments and bill management; the announcement disclosed no revenue, client, pipeline or employee metrics and did not specify planned use of proceeds.