5 stories on Sierra since May 6, 2026, newest first, with 1 funding round from the tracker.
Sierra raised 950M led by Tiger Global and GV at a 15B valuation, betting outcome-priced AI agents will replace seat-based customer service software.
Sierra closes $950M at $15.8B valuation led by Tiger Global, after hitting $150M ARR in 8 quarters with 40% Fortune 50 penetration.
Sierra hit $150M ARR in 8 quarters with a $950M raise at $15.8B, targeting the $400B global customer service market with AI agents.
Sierra raises $950 million at a $15 billion valuation, with 40 percent of the Fortune 50 now running its AI customer experience agents.
Bret Taylor's Sierra raises nearly $1B for AI customer service agents, with clients including one in three of the world's largest banks and insurers like Prudential and Cigna.