About Sierra
Sierra is a Technology company based in San Francisco (United States) founded in 2023 by Clay Bavor and Bret Taylor. Sierra is focused on enhancing customer experiences through AI technology. It operates on a AI-as-a-Service and SaaS (Software-as-a-Service) model. Sierra has raised $1.59 billion across 5 funding rounds from investors including Kleiner Perkins, Lightspeed Venture Partners and SoftBank Vision Fund. The company has 1,107 employees. Sierra has completed 1 acquisition, including Fragment. Sierra was last valued at $15.8 billion in May 2026. Its website sierra.ai draws about 233 thousand monthly visits. Sierra offers products and services including AI Agent, Agent OS, and Voice. Its focus areas include Artificial Intelligence and Conversational AI. Its legal entity is SIERRA TECHNOLOGIES, INC.
Company details
Sierra is engaged in developing AI-driven solutions to improve customer experiences across various industries. The company is specialized in conversational AI agents that support real-time customer interactions, problem-solving, and personalized communication. Services are provided to sectors such as financial services, healthcare, telecommunications, media, travel, hospitality, retail, consumer goods, and technology. AI agents are built to be empathetic, always available, and aligned with brand identity. Integration with existing systems is ensured for seamless operation, while trust, security, and compliance are prioritized in all solutions.
- Total Equity Funding$1.59B (USD)
in 5 rounds
- Latest Funding Round$950M (USD), Series E
May 2026
- InvestorsKleiner Perkins
& 10 more
- Employee Count1,107
- Investments & Acquisitions
Products & Services of Sierra
Sierra offers a comprehensive portfolio of products and services, including AI Agent, Agent OS, and Voice.
AI agent is deployed for customer engagement and support.
Platform is used to build and manage AI agents.
Voice tool is provided for personalized customer phone calls.
Apps and channels of Sierra
its YouTube channel Sierra has 473 subscribers and 20 videos.
Videos from Sierra
The most watched videos on Sierra's YouTube channel, Sierra (473 subscribers). Click a video to play it here.
More on Sierra.
Funding Insights of Sierra
Sierra has successfully raised a total of $1.59B across 5 strategic funding rounds. The most recent funding activity was a Series E round of $950 million completed in May 2026. This substantial capital infusion reflects strong investor confidence in the company's business model, growth potential, and market opportunities. The funding enables strategic expansion, product development, market penetration, and operational scaling to drive long-term value creation and competitive advantage.
- Total Funding $1.59B
- Total Rounds 5
- Last Round Series E — $950M
- First Round $110M
(Feb 2024)
- Investors Count 11
All 5 funding rounds of Sierra with amounts and investors; the two latest post-money valuations are shown, the rest are part of the premium plan.
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| May 2026 | $950M | Series C | – | Tiger Global Management, Google Ventures | |
| May 2026 | $950M | Series E | – | Tiger Global Management, Google Ventures | |
| Sep 2025 | $350M | Series D | – | Greenoaks | – |
| Oct 2024 | $175M | Series D | – | Greenoaks | |
| Feb 2024 | $110M | Series D | – | Sequoia Capital, Benchmark | – |
| Date | Valuation | Stage |
|---|
Full valuation and stage history of Sierra
Every valuation point, the growth-stage changes (minicorn, soonicorn, unicorn) and the dates behind them require an active premium plan.
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Last known valuation $15.8B (May 2026). 11 investors in total: 11 institutional.
Investors in Sierra
Sierra has secured backing from 11 investors, including venture fund investors. Prominent investors backing the company include Kleiner Perkins, Lightspeed Venture Partners and SoftBank Vision Fund.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Tech-enabled businesses are funded by Greenoaks venture capital firm. | greenoaks.com | San Francisco, United States | ||
Provider of investment management and real asset services | iconiqcapital.com | San Francisco, United States | ||
Early-stage technology startups are invested in by Thrive Capital. | thrivecap.com | New York, United States | ||
Sequoia Capital is engaged in venture capital investments. | 1972 | sequoiacap.com | ||
Venture capital investments are offered to promising startups. | benchmark.com | San Francisco, United States | ||
| tigerglobal.com | ||||
Corporate backed venture capital fund investing in multiple sectors | gv.com | Mountain View, United States | ||
Venture capital investments in technology and startups. | 2016 | visionfund.com | London, United Kingdom | |
Venture capital investing in innovative companies across global sectors is undertaken by Lightspeed Venture Partners. | 1997 | lsvp.com | Menlo Park, United States | |
Early-stage investments are provided to transformative technology companies. | svangel.com | San Francisco, United States |
Investor details for Sierra
The complete investor list, round-by-round participation and investor portfolios require an active premium plan.
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People of Sierra
25 people are tracked at Sierra (4 in leadership, 21 in team); the tracked headcount is 1,107.
| Name | Role | Group |
|---|---|---|
Clay Bavor | Co-Founder | Leadership |
Bret Taylor | Co-Founder | Leadership |
Greg Marsh | Head Of Recruiting | Leadership |
Anna Rosenman | Head of Marketing | Leadership |
Colin Vanlang | Engineer | Team |
Shirley Ho | Recruiter | Team |
April Chang | Talent Acquisition | Team |
Greg Snyder | Recruiter | Team |
Sarah Altabet | University Recruiting | Team |
Junko Maegawa | Designer | Team |
Eve Galazin | Senior Business Recruiter | Team |
Emily Gebru | Integrated Marketing + Campaigns Lead | Team |
Crishia Davis | Recruiting Lead | Team |
Mark McBride | Engineer | Team |
Jake Donham | Engineer | Team |
Nicole Searl | Recruiter - UK | Team |
Michan Hardy | Recruiting Programs Manager | Team |
Rachel Morris | Recruiting Operations | Team |
Mihai Parparita | Founding Engineer | Team |
Bryan Liu | Recruiting | Team |
5 more people are available in the full profile.
Complete people profiles for Sierra
Full employee and board profiles, team structure, tenure and professional contact details require an active premium plan.
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Investments & Acquisitions by Sierra
Sierra has strategically engaged in corporate development activities, having acquired 1 company. Notable acquisitions include Fragment.
| Company Name | Description | Domain | Location | Founded | Acquired | Amount |
|---|---|---|---|---|---|---|
AI-interfaced workflow automation solutions are provided for enterprises. | checkfragment.com | San Francisco, United States | 2023 | Apr 2026 | •••• |
Complete acquisition details for Sierra
Acquired stakes, deal sources and the complete acquisition history require an active premium plan.
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Timeline of Sierra
5 dated milestones of Sierra across 3 years, from founding to its latest funding, stage changes and deals.
- Founded Sierra is founded.
- Funding First funding round of $110.0M.
- Milestone Reaches Unicorn status.
- Acquisition Acquires Fragment.
- Funding Latest funding round, Series E, of $950.0M.
Web traffic of Sierra
The website of Sierra (sierra.ai) receives about 233.5K visits a month and ranks #194,223 among all websites worldwide, #41 in AI Chatbots and Tools.
- Monthly visits233.5K
▲ 6.3% vs previous month
- Unique visitors94.1K
per month
- Global rank#194,223
among all websites
- Category rank#41
AI Chatbots and Tools
- Bounce rate47%
- Pages per visit2.7
- Average visit1 min 21 sec
- DevicesDesktop 53% · Mobile 47%
Websites whose visitors overlap most with Sierra. Affinity shows how closely the audiences match.
| Website | Domain | Audience affinity | Monthly visits | Global rank | Profile |
|---|---|---|---|---|---|
| anthropic.com | 100% | 9.5M | #7,416 | View details | |
| perplexity.ai | 92% | 170.1M | #242 | View details | |
| openai.com | 91% | 210.1M | #205 | View details | |
| cursor.com | 90% | 18M | #2,913 | View details | |
| glean.com | 88% | 2.6M | #27,072 | View details | |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
All 14 similar websites and full traffic analytics for Sierra
The complete similar-websites list, audience overlap and engagement analytics require an active premium plan.
- 14 similar websites
- Audience overlap
- Engagement analytics
- Traffic by brand
Verified entity values are shown only after access is granted.
Top companies in Chatbots
3 companies that operate in the same segment as Sierra (Chatbots) in United States, ranked by their profile score on The Company Check.
| Company | Description | Founded | Location | Total funding | Revenue | Employees |
|---|---|---|---|---|---|---|
Cloud-based omnichannel communication and customer engagement platform is utilized. | 2008 | San Francisco, California, United States | USD 239.77 M | USD 5.07 B | 5,540 | |
Cloud-based business process management suite solutions are delivered. | 2010 | San Mateo, California, United States | USD 400.05 M | USD 838.81 M | 4,500 | |
AI-based conversational solutions are provided for user interactions and learning. | 2021 | Menlo Park, California, United States | USD 193 M | 325 |
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Related news about Sierra
Complete news archive for Sierra
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Frequently Asked Questions about Sierra
Sierra was founded in 2023 and raised its 1st funding round 1 year after it was founded.
Sierra is headquartered in San Francisco, United States. It is registered at San Francisco, California, United States.
Sierra is a funded company, having raised a total of $1.59B across 5 funding rounds to date. The company's 1st funding round was a Series D of $110M, raised on Feb 2024.
Sierra has 1,107 employees.
Sierra is engaged in developing AI-driven solutions to improve customer experiences across various industries. The company is specialized in conversational AI agents that support real-time customer interactions, problem-solving, and personalized communication. Services are provided to sectors such as financial services, healthcare, telecommunications, media, travel, hospitality, retail, consumer goods, and technology. AI agents are built to be empathetic, always available, and aligned with brand identity. Integration with existing systems is ensured for seamless operation, while trust, security, and compliance are prioritized in all solutions.
Sierra offers AI Agent, Agent OS, and Voice.
Sierra has made 1 acquisition, including Fragment.
Sierra has 11 investors. Key investors include Kleiner Perkins, Lightspeed Venture Partners, SoftBank Vision Fund, Greenoaks, and Iconiq Capital.
The valuation of Sierra is $15.8B as of May 2026.
Sierra operates through Sierra Technologies, Inc..
The website of Sierra receives about 233 thousand visits a month and ranks #194,223 among all websites worldwide.