Series A · Data & Analytics · London, United Kingdom · Founded 2019 · 11–50 employees
QuestDB is an open-source time series database that delivers ultra-low latency and high ingestion throughput for real-time analytics. Built from scratch by low-latency trading veterans, it offers SQL compatibility while achieving query performance in milliseconds. The company has raised $14.4M total funding including a $12M Series A in 2021, and serves major clients like Airbus, Yahoo, and Brazil's B3 stock exchange. QuestDB's unique approach eliminates vendor lock-in by supporting Parquet and open formats, making it attractive for financial services, IoT, and machine learning applications.