Weights & Biases
Weights & Biases is a machine learning operations (MLOps) platform that provides tools for experiment tracking, model management, and collaborative AI development. The platform serves as a system of record for training and fine-tuning AI models, used by over 1,400 organizations including AstraZeneca, OpenAI, NVIDIA, Meta, and Toyota.
Acquired
Weights & Biases has been acquired
This company is no longer available on our private secondary market.
Overview
Company data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Founded
2017
Employees
250–350
Total Funding
$250M
5 rounds
Latest Valuation
$1.25B
August 9, 2023
Funding
Total raised $250M across 5 rounds
Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Last updated 06-25-2026
Latest Round
Type
Strategic / Series D
Date
August 9, 2023
Amount
$50M
Valuation
$1.25B
Lead Investors
| Date | Round | Amount Raised | Valuation | Lead Investors |
|---|---|---|---|---|
| August 9, 2023 | Strategic / Series D | $50M | $1.25B | Daniel Gross, Nat Friedman |
| October 13, 2021 | Series C | $135M | $1B | Felicis Ventures, BOND |
| February 23, 2021 | Series B | $45M | $0.28B | Insight Partners |
Funding by Round
Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Valuation Trajectory
Valuation indexed to 1.0× at the selected entry round. Valuation marks are estimates and may contain errors. Hover each dot to compare.
Entry · Series B
$0.3B
Feb 2021
Weights & Biases today
$1.3B
Aug 2023 · latest mark
Weights & Biases multiple
4.5x
valuation uplift since first round
Y-axis is logarithmic. Hollow dots = estimated valuations. Does not represent realized investor returns.
Prominent Investors
Leadership
Lukas Biewald
CEO & Co-Founder
Chris Van Pelt
Co-Founder & CISO
Shawn Lewis
Co-Founder & CTO
Competitors
Competitor list is illustrative and may be incomplete, stale, or erroneous.
MLflow
Open-source platform for managing ML workflows and experiment tracking
Neptune.ai
Enterprise-grade MLOps metadata database for experiment tracking and governance; being acquired by OpenAI
Comet.ml
Machine learning platform for experiment tracking and model management
ClearML
MLOps platform noted as a top Weights & Biases alternative
Pachyderm
Data versioning and pipeline orchestration tool for ML workflows
DVC (Data Version Control)
Open-source version control system for machine learning projects
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