Sierra revenue, valuation & funding | Sacra

Sierra

Conversational AI tool for enterprises to automate customer service across chat and voice

Revenue

$200.00M (2026)

Valuation

$15.80B (2026)

Funding

$1.58B (2026)

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Details

Milestones

Overview

Revenue

Sierra Data Summary | Sacra

Sierra hit $200M in ARR in May 2026, up from ~$130M at the end of 2025 and $26M at the end of 2024.

Business Model

Sierra is an AI-powered customer service platform that develops conversational AI agents for enterprises, charging based on conversation volume or outcomes. They work closely with clients to create customized AI agents that embody the unique brand voice, policies, and workflows of each client.

Valuation & Funding

Valuation Summary | Sacra

In May 2026, Sierra raised a $950 million Series E led by GV and Tiger Global at a post-money valuation of $15.8 billion.

Valuation & Funding History

Date Event Valuation Amount Price Status
May 2026 Series E $15.8B $950.0M $81.52 Closed
Sep 2025 Series C — — — Announced
Oct 2024 Series B — — — Closed
Feb 2024 Seed — — — Announced

Product

Sierra launched in 2023, developed as a productized BPO designed to replace human agents with chat & voice agents. Sierra's product provides AI agents that can communicate naturally with customers, understand company-specific vocabulary, and access internal systems.

Sierra's platform, Agent OS 2.0, includes multiple products for agent configuration and development, allowing non-engineering teams to build complex workflows.

Competition

Sierra operates among AI-powered customer service solutions, competing directly with Decagon AI and established platforms like Zendesk and Salesforce.

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