Sumble

Market position

Operates in the crowded sales/GTM intelligence market alongside ZoomInfo, Apollo.io, Cognism, Slintel, SalesLoft, Reply.io, HubSpot and Outreach, as well as workflow tools such as Clay and technographic vendors such as BuiltWith. Its stated claim to defensibility is the breadth and structure of its knowledge graph — described as covering about 2.6 million companies and designed to be queryable by large language models — though its underlying data is publicly available, which the company's own investors and press coverage note as a competitive risk.

Rather than selling contacts, firmographics or website-scraped tech detection, Sumble links people, teams, reporting lines, technologies, hiring activity and project signals into one structured account view — for example identifying that a named platform engineering team of 72 people at a bank uses a specific observability tool, who leads it, where they are based, and how usage has shifted over time. Data is structured for LLM querying, and the company emphasizes low setup effort compared with blank-canvas workflow tools.

Technology

A knowledge graph built from large-scale daily crawling of company-related web pages — job posts, company sites, social media and regulatory filings — with AI models layered on top to extract signals such as departmental tech usage, active projects, org structure and adoption intent. The graph is intentionally structured for querying by large language models, and is exposed through a web app, REST API with OpenAPI/client generation, an MCP server and a Slack agent.

Go-to-market

Product-led and bottom-up: a free 30-day trial with no credit card, individual Pro subscriptions, and expansion inside accounts spreading through Slack channels, teams and offices — the company describes growing from one to 500 monthly active users within a single customer over six months, with growth to date driven by word of mouth. API, MCP and CRM integrations support broader enterprise deployment, and the company also runs enterprise services and a founding account-executive-led motion.

Sales, growth, RevOps and GTM teams selling into technical or complex accounts. Named customers include Snowflake, Figma, Wiz, Vercel, Elastic, Atlan, Weights & Biases, Omni, Snyk and Dataiku.

Geography

Headquartered in San Francisco, California, with a knowledge graph covering companies worldwide (approximately 2.6 million companies).

History

Founded in 2022 in San Francisco by Anthony Goldbloom and Ben Hamner, who had previously founded Kaggle (a data science and machine learning community with more than 25 million users) and sold it to Google in 2017. Sumble operated in stealth for roughly three years, launching its account-intelligence product publicly in April 2024 and only announcing itself and its funding in October 2025, by which point it reported 19 enterprise customers.

Risks & controversies

Sumble competes against well-established incumbents and numerous AI sales-development point solutions, and because it relies on publicly available data there is limited structural barrier to competitors replicating its approach; the company argues its defensibility comes from the accumulated richness and structure of its knowledge graph. Investor relationships overlap with the founders' prior company, including a Canaan partner who was a Kaggle board observer and Goldbloom's role as co-founder and investment partner at AIX Ventures, an investor in Sumble, from which he said he recused himself.