Weights & Biases Acquisition, Valuation, Funding & Investors
Weights & Biases was acquired by CoreWeave for $1.7B in March 2025.
Weights & Biases revenue
$20M
Undisclosed stage · Aug 2023
Cumulative funding Weights & Biases raised
$250M
across 5 funding rounds
Key investors in Weights & Biases
Coatue
Insight Partners
Bloomberg Beta
Nat Friedman
Felicis
Trinity Ventures
About Weights & Biases
Weights & Biases is a San Francisco-headquartered platform for machine learning experiment tracking and collaboration. Developers use it to log metrics, visualize training runs, and manage datasets across frameworks like PyTorch and TensorFlow. The tool supports teams at organizations such as OpenAI, Uber, and NVIDIA in deploying production models. Launched in 2017, Weights & Biases operates globally with enterprise features for versioning and alerting.
Founded
2017
HQ
San Francisco, CAWebsite
Status
Acquired
Customer focus
B2B
Revenue model
Subscription
Revenue
$20M (Aug 2023)
Valuation
$1.3B (Aug 2023)
Weights & Biases Acquisition
Weights & Biases was acquired by CoreWeave for $1.7B on 4 March 2025.
Before the acquisition Weights & Biases had raised $250M across 5 funding rounds.
Weights & Biases, a leading AI developer platform for model training, application evaluation, monitoring, and iteration, was acquired by CoreWeave, an Nvidia-backed AI hyperscaler providing high-performance cloud infrastructure and managed services optimized for accelerated computing. CoreWeave (Nasdaq: CRWV), headquartered in Livingston, N.J., completed the acquisition on May 5, 2025, following an agreement announced in early March 2025, reportedly for $1.7 billion according to The Information; Weights & Biases had been valued at $1.25 billion in 2023 and recently filed for an IPO. The deal builds on CoreWeave's recent IPO, expanding its customer base and providing insights into high-impact AI uses across industries. The strategic rationale centers on combining CoreWeave's compute infrastructure with Weights & Biases' software to deliver a unified AI Cloud Platform purpose-built to develop, deploy, and iterate AI models and agents faster, enhancing efficiency from training to monitoring while simplifying workflows and accelerating time-to-market. CoreWeave commits to maintaining Weights & Biases' platform interoperability, allowing customers flexibility in deployment options, infrastructure providers, foundation models, frameworks, and protocols. Post-acquisition announcements highlight new co-built products and capabilities for AI labs and engineers, with leaders like CoreWeave CEO Michael Intrator and Weights & Biases co-founder Lukas Biewald emphasizing accelerated innovation, shared values, and empowerment of AI builders in the inference era amid intense competition and rapid technological change.
| Acquirer | Date | Type | Price |
|---|---|---|---|
| 4 Mar 2025 | Strategic M&A | $1.7B |
Weights & Biases Valuation
Weights & Biases is currently valued at $1.3B, based on its undisclosed-stage round in August 2023.
The $50M round was led by Daniel Gross and Nat Friedman, with participation from Octave, Bloomberg Beta, Felicis, Sapphire Ventures, Coatue and 2 other investors.
Weights & Biases' valuation has grown 1.3x from $1B at its Series C in October 2021 to $1.3B in August 2023, across 2 priced rounds.
Weights & Biases valuation by funding round
Revenue multiple| Date | Stage | Valuation | Revenue Multiple |
|---|---|---|---|
| Aug 2023 | Undisclosed stage | $1.3B | 62.5x |
| Oct 2021 | Series C | $1B | 50.0x |
Weights & Biases Revenue
Weights & Biases' latest recorded revenue is $20M, as of its undisclosed-stage round in August 2023. At a $1.3B valuation, that implies a 62.5x revenue multiple.
Revenue moved from $20M in October 2021 to $20M in August 2023, while the revenue multiple moved from 50.0x to 62.5x.
Weights & Biases revenue by funding round
| Date | Revenue * | Valuation | Revenue Multiple | Stage |
|---|---|---|---|---|
| Aug 2023 | $20M | $1.3B | 62.5x | Undisclosed stage |
| Oct 2021 | $20M | $1B | 50.0x | Series C |
* Revenue (or ARR) figures are the values recorded alongside each funding round. Typically run-rate revenue at the time of the deal, or a reported LTM (last 12 months) revenue.
Weights & Biases Funding History
Weights & Biases has raised a total of $250M across 5 funding rounds.
Weights & Biases' first fundraising round was a $5M Series A in May 2018. The most recent completed round was a $50M undisclosed-stage round in August 2023.
Weights & Biases funding rounds
| Date | Stage | Investors | Raised | Valuation | Deal Summary |
|---|---|---|---|---|---|
| Aug 2023 | Undisclosed stage | Daniel Gross (lead); Nat Friedman (lead); Octave; Bloomberg Beta; Felicis; Sapphire Ventures; Coatue; Insight Partners; Bond | $50M | $1.3B | Weights & Biases is an end-to-end MLOps platform that provides a collaborative workspace for machine learning practitioners to track, visualize, analyze, and optimize AI models throughout the development cycle, including a new product W&B Prompts for monitoring large language models. Founded in 2017 by Lukas Biewald, Chris Van Pelt, and Shawn Lewis in San Francisco, the company serves major customers like OpenAI, Nvidia, Meta, Microsoft, Toyota, Volkswagen, Cohere, MosaicML, Aleph Alpha, and Hugging Face, with its tools used to track nearly 300 million hours of ML experiments. On August 9, 2023, Weights & Biases closed a $50 million strategic funding round at a $1.25 billion valuation, led by Daniel Gross and Nat Friedman, with participation from Sapphire Ventures and existing investors Coatue, Insight Partners, Felicis, BOND, and Bloomberg Beta. This up-round from its prior $1 billion valuation in late 2021 reflects strong growth, as user base expanded from 100,000 to over 700,000 ML practitioners. The funds will expand offerings to support organizations in managing AI projects amid rising generative AI adoption. Investors highlighted Weights & Biases' position as the go-to tool for model training and its expansion into prompting for safe, reliable LLM use in enterprises, noting terrific SaaS margins. The platform powers most prominent LLMs and is used by leading AI labs and hundreds of enterprises across industries, positioning it to capture share in the booming AI tooling market. |
| Oct 2021 | Series C | Bond (lead); Felicis (lead); Coatue; Insight Partners | $135M | $1B | Weights & Biases is a San Francisco-based MLOps platform founded in 2017 that provides developer-first tools for machine learning operations, helping practitioners track, iterate, and share model experiments while organizing and processing project data. The company closed its Series C funding round in October 2021, raising more than $135 million at a $1 billion post-money valuation from lead investors Felicis Ventures and BOND, along with existing investors Insight Partners and Coatue. By August 2023, the company had grown to over 700,000 users (up from 100,000 since the Series C) and was used by major AI builders including Meta, OpenAI, Mosaic ML, HuggingFace, and industry leaders like NVIDIA, Toyota Research Institute, and Volkswagen. The platform had tracked nearly 300 million hours of machine learning experiments across its customer base. The company raised an additional $50 million in August 2023 at a $1.25 billion valuation, led by Daniel Gross and Nat Friedman, to expand tools for large language model optimization and launch W&B Prompts. |
| Feb 2021 | Series B | Insight Partners (lead); Richard Socher; Pieter Abbeel; Jeff Hammerbacher; Bloomberg Beta; Nat Friedman; Tom Preston-Werner; Coatue; Trinity Ventures | $45M | - | Weights & Biases, founded by Lukas Biewald and others, is a developer-first MLOps platform that helps machine learning teams track their models, datasets, and experiments. The company's software enables ML practitioners to supervise model training and has become a popular choice among organizations including Meta, OpenAI, and Microsoft. In February 2021, Weights & Biases closed a $45 million Series B funding round led by Insight Partners, with continued participation from existing investors Coatue and Trinity Ventures, plus angel investors including Tom Preston-Werner (founder of GitHub), Pieter Abbeel, Nat Friedman, Jeff Hammerbacher, and Richard Socher. According to Insight Partners' statement at the time, the company's user base had grown 60x in the two years prior to the funding announcement. The platform was used and loved by over 70,000 practitioners. The company continued to raise significant capital in subsequent rounds, closing a $135 million Series C at a $1 billion valuation in October 2021, followed by a $50 million round in August 2023 at a $1.25 billion valuation led by Daniel Gross and Nat Friedman. |
| May 2019 | Series B | Coatue (lead); Richard Socher; Nat Friedman | $15M | - | Weights & Biases raised $15 million in its Series B funding round in May 2019, led by Coatue with participation from angels including Nat Friedman and Richard Socher. The company, founded in 2017 by Lukas Biewald, Chris van Pelt, and Shawn Lewis, develops an MLOps platform for machine learning experiment tracking and collaboration. Customers at the time included OpenAI, GitHub, Qualcomm, Toyota Research Institute, Stanford, and Columbia. This round brought total funding to $20 million following a prior $5 million Series A in May 2018 led by Trinity Ventures. The proceeds were intended to scale the platform and grow the team amid rising demand. |
| May 2018 | Series A | Trinity Ventures (lead); Bloomberg Beta; Gaingels; Hack VC | $5M | - | Weights & Biases raised $5 million in a Series A funding round in May 2018 led by Trinity Ventures, with participation from Bloomberg Beta. The round supported building the initial version of their MLOps platform and attracting early adopters. The company, founded in 2017 and based in San Francisco, develops tools for machine learning practitioners to track models, datasets, and experiments. Trinity Ventures' Dan Scholnick, who previously backed the founders' prior company Figure Eight, joined the board. The funding aimed to streamline the machine learning development process, making AI implementation accessible beyond highly specialized engineers. Weights & Biases positioned itself to transform MLOps workflows, starting with experiment tracking. |
Who has invested in Weights & Biases?
16 investors have backed Weights & Biases across its funding rounds, including Coatue, Insight Partners, Bloomberg Beta, Nat Friedman, Felicis and Trinity Ventures.
Lead investors include Daniel Gross, Nat Friedman, Bond, Felicis, Insight Partners and 2 other investors.
Weights & Biases Investors
| Investor | HQ | Rounds | Role | First check |
|---|---|---|---|---|
| New York City, NY | 4 | Lead | May 2019 | |
| San Francisco, CA | 3 | Participant | May 2018 | |
| United States | 3 | Lead | May 2019 | |
| New York City, NY | 3 | Lead | Feb 2021 | |
| San Francisco, CA | 2 | Participant | May 2019 | |
| San Francisco, CA | 2 | Lead | Oct 2021 | |
| San Francisco, CA | 2 | Lead | May 2018 | |
| San Francisco, CA | 2 | Lead | Oct 2021 | |
![](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><rect fill="%23e5e7eb" width="20" height="20" rx="4"/></svg>){kind=small} Pieter Abbeel | San Francisco, CA | 1 | Participant | Feb 2021 |
| Daniel Gross | San Francisco, CA | 1 | Lead | Aug 2023 |
| Jeff Hammerbacher | United States | 1 | Participant | Feb 2021 |
| United States | 1 | Participant | Aug 2023 | |
| Tom Preston-Werner | San Francisco, CA | 1 | Participant | Feb 2021 |
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Start Free TrialWeights & Biases Competitors
Weights & Biases competitors include listed companies like Presight AI, SenseTime Group, TRS Information Technology and C3.ai, and private ones like Coralogix and H2O.ai.
| Company | HQ | Status | Revenue | EBITDA | Valuation | Revenue Multiple |
|---|---|---|---|---|---|---|
 Ramat Gan | Private | $100M | - | $1.6B | 16.0x | |
 UAE | Publicly listed | $825M | $214M | $5.7B | 5.4x | |
 China | Publicly listed | $748M | ($70M) | $6.2B | 5.8x | |
| San Francisco, CA | Private | - | - | $1.7B | - | |
| China | Publicly listed | $76M | ($20M) | $1.7B | 19.7x | |
| United States | Publicly listed | $250M | ($484M) | $1.7B | 4.5x |
Weights & Biases Public Comps
Weights & Biases is no longer listed, but its public comps include Wenge AI, Amplitude, TRS Information Technology, C3.ai, Shenzhen Ysstech Info, Planisware, Innodata, PCITECH, Business-intelligence and BigBear.ai.
| Last FY | EV/Revenue | EV/EBITDA | ||||||
|---|---|---|---|---|---|---|---|---|
| Revenue | EBITDA | Last FY | LTM | 2027E | Last FY | LTM | 2027E | |
| $60M | ($20M) | 27.6x | - | (82.7x) | - | |||
| $343M | ($76M) | 4.6x | 4.1x | (21.1x) | 98.8x | |||
| $76M | ($20M) | 19.3x | 19.7x | (73.5x) | 478.8x | |||
| $250M | ($484M) | 4.3x | 4.5x | (2.2x) | (6.2x) | |||
| $205M | $4M | 7.2x | - | 378.8x | - | |||
| $228M | $78M | 7.3x | 6.7x | 21.5x | 18.4x | |||
| $252M | $47M | 6.8x | 5.2x | 36.6x | 22.7x | |||
| $1.5B | $53M | 0.8x | 0.9x | 24.1x | - | |||
This data is available for Pro users. Sign up to see all Weights & Biases competitors and their valuation data. Start Free Trial | ||||||||
Common questions about Weights & Biases
| When was Weights & Biases founded? | Weights & Biases was founded in 2017. |
| Where is Weights & Biases headquartered? | Weights & Biases is headquartered in San Francisco, CA, United States. |
| Is Weights & Biases publicly listed? | No, Weights & Biases was acquired by CoreWeave in March 2025. |
| Who acquired Weights & Biases? | Weights & Biases was acquired by CoreWeave in March 2025. |
| How much was Weights & Biases acquired for? | Weights & Biases was acquired for $1.7B in March 2025. |
| What is Weights & Biases' valuation? | Weights & Biases was last valued at $1.3B in its undisclosed-stage round in August 2023. |
| How much funding has Weights & Biases raised? | Weights & Biases has raised $250M across 5 funding rounds. |
| What was Weights & Biases' last funding round? | Weights & Biases' last funding round was a $50M undisclosed-stage round in August 2023, led by Daniel Gross and Nat Friedman. |
| Who are Weights & Biases' investors? | Weights & Biases' investors include Coatue, Bloomberg Beta, Nat Friedman, Insight Partners, Richard Socher, Felicis, Trinity Ventures, Bond, Pieter Abbeel, Daniel Gross and 6 others. |
| What is Weights & Biases' revenue? | Weights & Biases' latest recorded revenue is $20M (August 2023). |
| What is Weights & Biases' revenue multiple? | Weights & Biases' latest valuation implies a 62.5x revenue multiple ($1.3B valuation on $20M of revenue). |
| Which companies are comparable to Weights & Biases? | Companies comparable to Weights & Biases include Coralogix, Presight AI, SenseTime Group, H2O.ai, TRS Information Technology and C3.ai. |
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