Revenue Leaderboard › Customer service AI
Sierra logo
#75 by ARRSan Francisco, USsierra.ai ↗

Sierra

Sierra helps businesses to build and deploy AI agents that communicate with users across channels such as chat, voice, email, and messaging.

ARR
$200M
as of May 2026
Employees
~500
as of Jun 2026
Valuation
$15.8B
79× ARR
ARR / employee
$400K
revenue efficiency
About Sierra

Sierra AI develops artificial intelligence systems focused on improving customer experience through automated, conversational interactions. Its platform enables businesses to build and deploy AI agents that communicate with users across channels such as chat, voice, email, and messaging, handling both simple inquiries and more complex service tasks. These agents are designed to go beyond basic responses by taking actions within business systems, such as processing requests or managing customer accounts. The company’s technology integrates with existing enterprise tools and data sources, allowing organizations to incorporate AI-driven support into their operations without replacing underlying infrastructure. Overall, Sierra AI operates as a software provider that uses large language models and automation capabilities to support and scale customer service functions for enterprises.

Sierra helps businesses to build and deploy AI agents that communicate with users across channels such as chat, voice, email, and messaging. Crunchbase rank #157.

Investors · 7

LeadGVCorporate10 partners on file
LeadTiger GlobalPrivate equity30 partners on file
InvestorBenchmarkVenture capital16 partners on file
InvestorGreenoaksVenture capital12 partners on file
InvestorIconiq CapitalFamily office7 partners on file
InvestorSequoia CapitalVenture capital93 partners on file
InvestorThrive CapitalVenture capital19 partners on file
187 partner contacts across these firms, emails and LinkedIn are in Investor Contacts for paid members.
Sierra logo
GV (lead), Tiger Global (lead) · AI
$950M
val. $15.8B
105× EV/ARR

News, deals & research

Latest in AI
DealSiena raises $17M Series A led by York IE for AI agents that serve consumer brandsOct 7NewsSierra and Meta publish Personal Agent Protocol, an OAuth standard for agents to log in to businessesOct 6DealSierra raises $950M Series EMay 4
Members see the full Revenue Leaderboard · 2,100+ private AI companies ranked by revenue, filterable by category and country, free.
Create my free account →Log in