Sierra Raises $950M at $15.8B Valuation — AI Customer Service Agents Now Used by Nearly Half the Fortune 50

TechCrunch·high signal

Bret Taylor's Sierra closed a $950M round led by Tiger Global and GV on May 4, pushing valuation to $15.8B. The company sells AI customer service agents that have reached $150M ARR and are deployed across nearly half the Fortune 50. This is the clearest signal yet that AI agents are winning enterprise support budgets away from Zendesk and Intercom at scale.