Weights & Biases
The AI developer platform.
TL;DR
What: Developer-first MLOps platform for tracking, visualizing, and managing machine learning experiments and workflows
Founded: 2017 — Lukas Biewald, Chris Van Pelt, Shawn Lewis
Funding: Reported $250M total raised (notable rounds: $135M Series C, $45M Series B, $50M strategic)
Exit: Acquired by CoreWeave (announced Mar 4, 2025)
Notable customers: Used by organizations including OpenAI
Company Overview
Problem Domain
Machine learning development and operations (MLOps): experiment tracking, dataset/versioning, evaluation, and pipeline management.
Founded
2017
Industry
MLOps; AI developer platform
Funding Track Record
Acquired by CoreWeave; transaction price reported by press as $1.7B.
$50M
Round reported to value the company at about $1.25B and to bring total raised to $250M.
$135M
Supersized Series C announced Oct 13, 2021.
$45M
Series B announced Feb 1, 2021.
$15M
Round announced May 30, 2019.
$5M
Early funding round announced May 31, 2018.
Investor Signal
“Backed by venture firms (Coatue, Insight Partners, Felicis, Bond, Bloomberg Beta, Sapphire, Trinity Ventures) and strategic/angel investors (Nat Friedman, Daniel Gross)”