Weights & Biases is an AI developer platform for building, tracking, and managing AI applications and machine learning models. It serves teams working on LLMOps and MLOps workflows and is used by companies such as OpenAI, NVIDIA, and Cohere.
Access to pre-IPO shares is available to accredited investors through UpMarket.
Latest Price
Previous Price
Undisclosed
How to Invest in Weights & Biases Through UpMarket
Weights & Biases shares are not on public exchanges. UpMarket provides accredited investors access through secondary market transactions.
Step 01
Verify accredited investor status
Confirm eligibility under SEC Rule 501 of Regulation D. Income or net worth threshold applies.
Step 02
Create an UpMarket account
Complete KYC/AML onboarding. Typically 1–2 business days. Licensed rep assigned on signup.
Step 03
Review available Weights & Biases offerings
Full offering memoranda and risk disclosures provided before any commitment is required.
Step 04
Complete subscription documents
Review and sign subscription agreement. All documents handled digitally through the platform.
Step 05
Fund your investment
Wire transfer or ACH. $50K minimum. Funds held in custodial account until close.
Pre-IPO investments are illiquid, speculative, and involve risk of total loss of capital.
$1.3B+
UpMarket has brokered over $1.3 billion in alternative investments*
*Includes principal invested and appreciation of investments originated via the UpMarket platform based on historical trade volume and valuation estimates through March 31, 2026. Of the total, approximately $301 million is managed by UpMarket Management, with the remaining originated investments managed by affiliates. Past performance is not predictive of future results.
Valuation Growth Over Time
Post-money valuation by round
Previous roundsMost recent
Date
Round
PPS (split-adj.)
Valuation
May 2025
Acquired by CoreWeave
Undisclosed
Weights & Biases Revenue and Growth
Annual revenue
Why Investors Are Watching Weights & Biases
Growth Signal
W&B said it reached 700K users before a $50M round
A report on W&B’s August 2023 financing said the company had reached 700,000 users and then raised $50 million at about a $1.25 billion valuation. The same report described W&B as an AI tooling and MLOps platform for managing machine-learning models.
Competitive Moat
W&B built a developer-first MLOps platform for ML teams
Weights & Biases described itself as the leading developer-first MLOps platform when it raised its Series C at a $1 billion valuation. Its earlier Series B announcement said the funding would expand the product beyond experiment tracking into dataset versioning and model management.
Product Milestone
W&B raised $135M to expand its ML workflow platform
W&B’s company blog said it raised $135 million in Series C funding and that the round valued the company at $1 billion. The post said the capital would continue building its developer-first MLOps platform.
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No. As of March 2026, Weights & Biases is a private company and does not trade on any public stock exchange. Accredited investors can access Weights & Biases shares through UpMarket, a FINRA-registered broker-dealer that specializes in pre-IPO investments.
Weights & Biases does not have a public stock price because it is privately held. The most recent known share price comes from its last funding round. Pre-IPO share prices on the secondary market may differ from the last round price depending on supply, demand, and market conditions.
Yes. Accredited investors can indicate interest in Weights & Biases shares through UpMarket by filling out the form on this page or creating an account at upmarket.co. All pre-IPO offerings are subject to availability and require a $50,000 minimum investment. UpMarket is a FINRA-registered broker-dealer and has brokered more than $500M in alternative investments since 2019.
Pre-IPO investments carry significant risks. Weights & Biases shares are illiquid, meaning there is no public market to sell them quickly. There is no guaranteed exit timeline or return. The investment is speculative in nature, and investors should be prepared for the possibility of total loss. Valuations of private companies can fluctuate substantially between funding rounds. Investors should consult their financial advisor and review all offering documents before investing.
In a pre-IPO transaction, accredited investors purchase shares from existing shareholders (such as employees, early investors, or other holders) through secondary market platforms. The company itself does not issue new shares in these transactions. UpMarket facilitates these trades as a FINRA-registered broker-dealer, handling compliance, documentation, and settlement on behalf of both parties.
There are two primary exit paths for pre-IPO holdings: selling your shares on the secondary market to another buyer, or holding until the company completes an IPO or is acquired. Both paths are subject to transfer restrictions, company approval (right of first refusal), and market conditions. The timing of any exit is unpredictable, and investors should plan for a multi-year holding period.
The minimum investment for most pre-IPO offerings on UpMarket is $50,000. This amount may vary depending on the specific offering and share availability. There are no fees to create an UpMarket account or browse available investments. Investors only pay transaction-related fees when they complete an investment.
UpMarket's valuation estimate of is derived from a proprietary model that incorporates multiple data sources: funding round data (Caplight), revenue estimates (Sacra), secondary market pricing, and public company comparables. The model applies a private company discount to the public comp multiple to account for illiquidity and information asymmetry. This estimate is not investment advice and may differ substantially from the price at which shares actually trade.
Weights & Biases provides an AI developer platform for building, tracking, and managing LLMOps and MLOps workflows, reached 700K users before a $50M round and generated $13.6M in 2024 revenue — accredited investors can access Weights & Biases stock through UpMarket.