Temporal Technologies, based in Bellevue, Washington, develops an open source platform for building and operating long-running AI agents and other enterprise systems. The platform is designed for developers building complex, durable workflows at scale.
Led by Lightspeed, Wellington Management, Goldman Sachs Alternatives, and Tiger Global.
A $12.55 billion valuation for an AI infrastructure platform signals strong investor conviction that the tooling layer for agentic AI workloads is becoming a large, standalone market. The round is the largest U.S. startup deal reported for the week of September 12-18, 2026, reflecting continued appetite for infrastructure bets even as mega-rounds elsewhere pulled back. For data center operators, growing adoption of long-running AI agent frameworks points to sustained demand for persistent compute and low-latency storage.