Weights & Biases

Acquired

AI developer platform providing tools for machine learning experiment tracking, model fine-tuning, dataset versioning, and LLM evaluation. Used by teams at OpenAI, NVIDIA, and other leading AI organizations. Acquired by CoreWeave in 2025 for $1.7B.

Founders Lukas Biewald, Chris Van Pelt

CEO Lukas Biewald

Company

Founded

2017

Headquarters

San Francisco, United States

Financials

Total Funding

$250M

Last Valuation

$1.3B

Sectors

Artificial Intelligence Developer Tools Cloud Computing Data & Analytics

wandb.ai Twitter Blog

Funding History

5 rounds

Acquired by CoreWeave May 5, 2025

$1.7B

Undisclosed Aug 9, 2023

$50M

Valuation: $1.3B

Daniel Gross (Lead) Nat Friedman Sapphire Ventures Coatue Management Insight Partners Felicis Ventures BOND Bloomberg Beta

Series C Oct 13, 2021

$135M

Valuation: $1.0B

BOND (Lead) Felicis Ventures Insight Partners Coatue Management

Series B Feb 1, 2021

$45M

Insight Partners (Lead) Coatue Management Trinity Ventures Bloomberg Beta

Series B May 30, 2019

$15M

Coatue Management (Lead)

Series A May 31, 2018

$5M

Trinity Ventures (Lead) Bloomberg Beta

Funding data is compiled from multiple independent sources including company announcements, press coverage, and regulatory filings. While we strive for accuracy, amounts and dates may reflect reported figures at time of announcement.