Sierra Hits $15.8B Valuation on $950M Round as Bret Taylor's Bet Finds Its First $150M ARR Winner
Sierra closed a $950M Series E at a $15.8B valuation on May 4, led by Tiger Global and GV with Benchmark, Sequoia, and Greenoaks participating. Bret Taylor's enterprise AI agent platform hit $150M ARR in 8 quarters and counts 40% of the Fortune 50 as customers.