ClickHouse raises $400M, acquires Langfuse, Postgres service app

ClickHouse, a leader in real-time analytics and AI-ready data stacks, has closed a $400 million Series D financing. The round was led by Dragoneer Investment Group, with participation from Bessemer Venture Partners, GIC, Index Ventures, Khosla Ventures, Lightspeed Venture Partners, and accounts advised by T. Rowe Price Associates, Inc. and WCM Investment Management.

In tandem with the financing, the company announced the acquisition of Langfuse, an open-source LLM observability platform, and the launch of a native Postgres service to unify transactional and analytical workloads within a single stack.

Market momentum underpins the deal: ClickHouse Cloud now serves more than 3,000 customers, with ARR growth >250% YoY. Notable adopters include Capital One, Lovable, Decagon, Polymarket, and Airwallex, while industry names such as Meta, Cursor, Sony, and Tesla remain within the ecosystem.

Langfuse brings a compelling layer of LLM evaluation and tracing—an area growing in importance as AI models scale. The project has gained strong open-source traction, boasting well over 20K GitHub stars and millions of SDK installs per month.

The Postgres service delivers a cohesive data stack by coupling high-performance analytics with a transactional database, backed by NVMe storage and native change data capture. The collaboration with Ubicloud delivers production-grade Postgres integrated with ClickHouse, reinforcing the unified data stack strategy for AI builders.

The expansion also carries a global tilt: a recent push into Japan via Japan Cloud and a collaboration with Microsoft Azure around OneLake. ClickHouse has hosted large-scale events in multiple cities and broadened data-lake compatibility with Iceberg and Delta Lake, reinforcing its price-performance advantage in real-time analytics.

Looking ahead, the combination of robust funding, Langfuse’s integration, and a unified data platform positions ClickHouse to accelerate growth and cement its role as a premier provider of AI-enabled analytics and observability.