Home
Loading

aVenture is in Alpha: During this preview period, you should expect the research data to be limited and may not yet meet our exacting standards. We've made the decision to provide early access to our data to showcase the product as we build, but you should not yet rely upon it alone for your investment decisions.

aVenture is in Alpha: During this preview period, you should expect the research data to be limited and may not yet meet our exacting standards. We've made the decision to provide early access to our data to showcase the product as we build, but you should not yet rely upon it alone for your investment decisions.

Get in touch

  • Contact

  • Request a demo

  • Request data updates

  • Add a company

Research

  • Companies

  • Investors

  • People

aVenture

  • Sitemap

  • Feature requests

Member

Backed by

© aVenture Investment Company, 2026. All rights reserved.

San Francisco, CA, USA

Privacy Policy

aVenture Investment Company ("aVenture") is an independent research platform providing detailed analysis and data on startups, venture capital investments, and key industry individuals. It is not a registered investment adviser, broker-dealer, or investment advisor and does not provide investment advice or recommendations. The data provided by aVenture does not constitute recommendations or advice, whether by methodology, analysis, AI-generated content, or a statement written by a staff member of aVenture.

aVenture is not affiliated with any of the people, companies, organizations, government agencies, regulatory bodies, or investment funds we provide coverage for on this site unless explicitly stated otherwise. Users assume full responsibility for decisions made based on information obtained from this platform. Links to external websites do not imply endorsement or affiliation with aVenture. Any links that provide the ability to invest in a primary or secondary transaction in a company are for convenience only and do not constitute solicitations or offers to buy or sell an investment. Investors should exercise heightened precaution and due diligence when investing in private companies, especially those not independently audited.

While we strive to provide valuable insights with objectivity and professional diligence, we cannot guarantee the accuracy of the information provided on our platform. Before making any investment decisions, you should verify the accuracy of all pertinent details for your decision. To the fullest extent permitted by law, aVenture shall not be liable for any direct, indirect, incidental, consequential, or financial damages arising from use of this site, whether by consumers of its contents directly or by persons or organizations covered by our research, even if we are advised of the possibility. Our best-efforts processes and correction request forms do not create a warranty or duty of care.

Profiles on this platform may include content generated in part by large language models (LLMs, artificial intelligence) that aggregate publicly available sources (e.g., SEC EDGAR, public filings, press releases). Source attribution is provided where known; always verify statements and claims here against original sources before relying on any data. Content on our site may contain inaccuracies, omissions, or what are commonly called 'hallucinations' if generated in part or in full by AI / LLMs. The risk can also exist even when content is written by a human, as internal and third-party sources may also have inaccuracies for the same or different reasons. While we randomly audit a proportion of content, this is not exhaustive.

We recommend that an independent auditor be hired to verify the accuracy of the information before relying on it for any sensitive decisions. By accessing this platform, you agree not to rely solely on any information generated by AI, aggregated, or sourced or written otherwise on this site, for investment, financial, or other decisions. aVenture assumes no responsibility for inaccuracies, omissions, or hallucinations. You must independently verify all data from primary sources. Use of this platform constitutes your waiver of claims for reliance-based damages, including negligent misrepresentation. To report an error, request a correction, or dispute information about a company or individual, contact us via our request data updates form.

Loading homepage
Loading
Home›Research›Companies

Companies

Loading
Home›
Research›
Companies›
Sierra
AddedMay 6, 2026
UpdatedJun 26, 2026
Sierra

Sierra

Series E

Developer of an AI agent operating system for customer experiences

HQ
San Francisco, CA, US
Founded
2023
Overview
Analysis
Compare
Fundraising
Employees
News

Sierra develops an AI agent operating system that enables companies to build, test, and optimize AI agents for customer service and enterprise applications. The platform provides tools for analyzing agent performance, identifying conversations needing attention, and running automated tests.

Founded in 2023 by Bret Taylor and Clay Bavor, Sierra serves enterprise customers with capabilities for agentic AI deployment at scale.

Sierra - Products & Services

  • Sierra AI Agent logo

    Sierra AI Agent

    AI agent operating system for building autonomous customer service agents across chat, voice, and messaging channels.

    Competing Products

    Forethought logo
    Fin logo

Sierra - Similar Companies

Fin logo

Fin

Kore.ai logo

Kore.ai

Cresta logo

Cresta

Forethought logo

Forethought

forethought.ai

Giga logo

Giga

giga.ai

Siena AI logo

Siena AI

siena.cx

StaffAI logo

StaffAI

staffai.so

Factory logo

Factory

factory.ai

Patronus AI logo

Patronus AI

patronus.ai

xAI logo

xAI

x.ai

Tenyx logo

Tenyx

tenyx.com

Conduct logo

Conduct

conduct.ai

Rogo logo

Rogo

rogo.ai

Agent Copilot logo

Agent Copilot

agentcopilot.ai

Berri AI logo

Berri AI

Spine AI logo

Spine AI

getspine.ai

Sierra - Quick Facts

Who are Sierra's competitors?

Companies similar to Sierra include Fin, Forethought, Kore.ai and Giga.

When was Sierra founded?

Sierra was founded in 2023.

Where is Sierra's headquarters located?

Sierra's headquarters is located in San Francisco, CA, US.

When was Sierra's last funding round?

Sierra's most recent funding round was for $950M (USD) in May 2026.

How much has Sierra raised to-date?

As of May 4, 2026, Sierra has raised a total of $1.6B (USD).

How many employees does Sierra have?

Sierra has 628 employees as of Mar 31, 2026.

Sierra - Classification

Industry
  • AI/ML
  • Business Software Companies
  • Software Companies
Ownership
  • Venture-backed private company
Technology
  • Conversational AI
Geographic Exposure
  • Americas United States
Model
  • AI Platform
Revenue
  • SaaS
Customer
  • Enterprises
Tags
  • AI
  • B2B