About Weights & Biases
Weights & Biases is a Technology company based in San Francisco (United States) founded in 2017 by Lukas Biewald, Chris Van Pelt, and Shawn Lewis, and was acquired by CoreWeave in March 2025. Machine learning model development and management solutions are provided. Weights & Biases has raised $250 million across 5 funding rounds from investors including CoreWeave, Qualcomm Ventures and Archerman Capital. The company has 291 employees. Weights & Biases was last valued at $1.25 billion in August 2023. Its chief executive, as recorded, is Lukas Biewald. Its website wandb.ai draws about 2.2 million monthly visits. Weights & Biases offers products and services including Weights & Biases AI Developer Platform, W&B Weave, and W&B Models. Its focus areas include High Tech, AI Infrastructure, Machine Intelligence Systems and Machine Learning Platforms. Its legal entity is WEIGHTS AND BIASES, INC. Its competitors include Veritone, Anyscale and Comet; 3 of its 3 listed competitors have raised funding.
Company details
Weights Biases was founded in 2017 in San Francisco, United States, as a provider of tools for machine learning workflows. Services encompass experiment tracking, hyperparameter management, system metrics monitoring, and prediction analysis. Dataset versioning, data visualization, and model optimization features are included. Operations focus on the machine learning sector, with tools offered through a subscription-based pricing model.
- Headquarters San Francisco, United States
- Employees 291
- Founders Lukas Biewald, Chris Van Pelt, Shawn Lewis
- Stage Acquired
- SectorsTechnology
- Website category Computers Electronics and Technology
- Email••••••••
- Phone•••• ••••
- Website wandb.ai
- Social LinkedIn X Facebook
- Acquired by CoreWeave (Mar 2025)
- Legal Name Weights And Biases, Inc
Products & Services of Weights & Biases
Weights & Biases offers a comprehensive portfolio of products and services, including Weights & Biases AI Developer Platform, W&B Weave, and W&B Models.
Platform for building, evaluating, monitoring and managing AI models and agentic applications.
Tools for evaluating, tracing and monitoring generative AI applications in production.
Tools for experiment tracking, model management, datasets and AI model governance.
Funding Insights of Weights & Biases
Weights & Biases has successfully raised a total of $250M across 5 strategic funding rounds. The most recent funding activity was a Series C round of $50 million completed in August 2023. 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 $250M
- Total Rounds 5
- Last Round Series C — $50M
- First Round $5M
(Jun 2018)
- Investors Count 26
All 5 funding rounds of Weights Biases 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 |
|---|---|---|---|---|---|
| Aug 2023 | $50M | Series C | $1.25B | Nat Friedman, Daniel Gross | |
| Oct 2021 | $135M | Series C | $1B | Felicis Ventures, Bond Capital | |
| Feb 2021 | $45M | Series B | – | Insight Partners | |
| May 2019 | $15M | Series B | – | Coatue | |
| Jun 2018 | $5M | Series A | – | Trinity Ventures, Bloomberg Beta | – |
| Date | Valuation | Stage |
|---|---|---|
| Aug 2023 | $1.25B | •••••••• |
| Oct 2021 | $1B | •••••••• |
Last known valuation $1.25B (Aug 2023). 26 investors in total: 18 institutional and 8 angel.
Investors in Weights & Biases
Weights & Biases has secured backing from 26 investors, including venture fund, angel, and institutional investors. Prominent investors backing the company include CoreWeave, Qualcomm Ventures and Archerman Capital.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Venture capital firm partnering with enterprise software companies and early-stage funds. | sapphireventures.com | |||
Provider of an investment platform for various stages | coatue.com | New York, United States | ||
Investment firm scaling software and technology companies from early to late stages. | insightpartners.com | |||
Investments in technology startups are made by Felicis Ventures. | felicis.com | Menlo Park, United States | ||
Investments in multiple sectors are made by Bond Capital. | bondcap.com | San Francisco, United States | ||
Corporate backed venture capital firm focused on multiple sectors | bloombergbeta.com | San Francisco, United States | ||
Venture capital firm investing in early-stage technology and real estate companies. | trinityventures.com | |||
| bondcapital.ca | ||||
Web3 venture capital firm partnering on blockchain projects. | hack.vc | |||
Venture capital investing in technology sectors such as AI and automotive. | 2000 | qualcommventures.com | San Diego, United States |
Investor details for Weights Biases
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People of Weights & Biases
296 people are tracked at Weights & Biases (75 in leadership, 1 in board & advisors, 220 in team); the tracked headcount is 291.
| Name | Role | Group |
|---|---|---|
Lukas Biewald | ex-Co-Founder & CEO | Leadership |
Chris Van Pelt | ex-Co-Founder & CISO | Leadership |
Shawn Lewis | ex-Co-Founder & CTO | Leadership |
Jeffrey Baker | Chief Accounting Officer (cao) | Leadership |
Shane Monson | Director Of Technical Accounting | Leadership |
Yoon Kyu Park | Director Corporate Development | Leadership |
Bernard Chen | Director, Treasury | Leadership |
Vi Nguyen | People Business Partner, G&a | Leadership |
Jon Jones | Chief Revenue Officer | Leadership |
Genevieve Silverio | Director, People Programs | Leadership |
Rebecca Escobar | Director, People Business Partners (hrbp) | Leadership |
Josh Higgins | Vp, Brand & Creative | Leadership |
Carey Head | Senior Director, Brand & Creative | Leadership |
Neriah Howard | Talent Acquisition Partner | Leadership |
Jim Higgins | Chief Information Security Officer | Leadership |
Swati Jain | Senior Director Internal Control/sox | Leadership |
Korey Finn | Vice President, Corporate Development (data Centers) | Leadership |
Jean English | Chief Marketing Officer | Leadership |
Sandy Venugopal | Chief Information Officer | Leadership |
Gavin Murray | Director Of Data Centre Operations - Europe | Leadership |
276 more people are available in the full profile.
Complete people profiles for Weights & Biases
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Timeline of Weights & Biases
5 dated milestones of Weights & Biases across 8 years, from founding to its latest funding, stage changes and deals.
- Founded Weights & Biases is founded.
- Funding First funding round of $5.0M.
- Milestone Reaches Unicorn status.
- Funding Latest funding round, Series C, of $50.0M.
- Exit Acquired by CoreWeave.
Competitors of Weights & Biases
Weights & Biases has 3 listed competitors in our database, 3 of them funded. They include Veritone, Anyscale and Comet.
| Company Name | Domain | Founded | HQ Location | Total funding | Employees | Description |
|---|---|---|---|---|---|---|
| veritone.com | 2014 | Irvine, United States | $15M | 487 | AI-driven analytics for audio and video content are provided. | |
| anyscale.com | 2019 | San Francisco, United States | $280.53M | 118 | Provider of an AI-based open source framework for building distributed applications | |
| comet.com | 2017 | New York, United States | $63.02M | AI and SaaS-based ML solutions |
Detailed competitors of Weights Biases
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Web traffic of Weights & Biases
The website of Weights & Biases (wandb.ai) receives about 2.2M visits a month and ranks #22,417 among all websites worldwide, #2,890 in Computers Electronics and Technology.
- Monthly visits2.2M
▲ 3.6% vs previous month
- Unique visitors281.9K
per month
- Global rank#22,417
among all websites
- Category rank#2,890
Computers Electronics and Technology · Computers Electronics and Technology
- Bounce rate26%
- Pages per visit8.2
- Average visit9 min 14 sec
- DevicesDesktop 79% · Mobile 21%
Websites whose visitors overlap most with Weights & Biases. Affinity shows how closely the audiences match.
| Website | Domain | Audience affinity | Monthly visits | Global rank | Profile |
|---|---|---|---|---|---|
| huggingface.co | 100% | 24.9M | #1,689 | View details | |
openreview.net | openreview.net | 95% | #13,558 | – | |
| notion.so | 77% | 178.3M | #160 | View details | |
| paperswithcode.com | 76% | 680.7K | #2,232,223 | View details | |
icml.cc | icml.cc | 76% | #64,068 | – | |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
All 40 similar websites and full traffic analytics for Weights & Biases
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Top companies in AI Core Platforms & Infrastructure
3 companies that operate in the same segment as Weights & Biases (AI Core Platforms & Infrastructure) in United States, ranked by their profile score on The Company Check.
| Company | Description | Founded | Location | Total funding | Revenue | Employees |
|---|---|---|---|---|---|---|
OpenAI is engaged in developing advanced artificial intelligence technologies. | 2015 | San Francisco, California, United States | USD 58.07 B | 11,115 | ||
AI-powered graphical processing units and SoCs | 1993 | Santa Clara, California, United States | USD 5 M | USD 130.5 B | 42,000 | |
AI models and chatbots are offered for industry applications. | 2021 | San Francisco, California, United States | USD 136.81 B | 6,146 |
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Related news about Weights & Biases
Complete news archive for Weights Biases
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Frequently Asked Questions about Weights & Biases
Weights & Biases was founded in 2017 and raised its 1st funding round 1 year after it was founded.
Weights & Biases is headquartered in San Francisco, United States. It is registered at San Francisco, California, United States.
Lukas Biewald is the CEO of Weights & Biases, as recorded in our data. They have also founded this company.
Weights & Biases is a funded company, having raised a total of $250M across 5 funding rounds to date. The company's 1st funding round was a Series A of $5M, raised on Jun 2018.
Weights & Biases has 291 employees.
Weights Biases was founded in 2017 in San Francisco, United States, as a provider of tools for machine learning workflows. Services encompass experiment tracking, hyperparameter management, system metrics monitoring, and prediction analysis. Dataset versioning, data visualization, and model optimization features are included. Operations focus on the machine learning sector, with tools offered through a subscription-based pricing model.
Weights & Biases offers Weights & Biases AI Developer Platform, W&B Weave, and W&B Models.
Weights & Biases has 26 investors. Key investors include CoreWeave, Qualcomm Ventures, Archerman Capital, Sapphire Ventures, and Coatue.
The valuation of Weights & Biases is $1.25B as of Aug 2023.
Weights & Biases operates through Weights And Biases, Inc.
Yes. Weights & Biases was acquired by CoreWeave in March 2025.