Temporal's Valuation Jumps to $12.55 Billion in Seven Months

Temporal Technologies closed a $550 million Series E at a $12.55 billion valuation, the company said Sept. 14, up from the $5 billion valuation attached to its $300 million Series D just seven months earlier, in February. The 2.5-times increase came from a round Temporal announced on its own blog as already closed rather than merely committed.

Lightspeed co-led the round alongside Wellington Management, with new money from Goldman Sachs Alternatives' growth equity arm, Tiger Global, T. Rowe Price and SV Angel. Returning investors from earlier rounds, including a16z, Sequoia, Index Ventures, GIC, Sapphire Ventures and Amplify, also participated, Temporal said.

The usage numbers behind the multiple

Temporal said its annualized revenue run rate grew more than 200% year over year, with net dollar retention above 200% since February, meaning existing customers are now spending more than twice what they were seven months ago. The company said its cloud platform processed 1.9 trillion billable actions in August, up 350% from a year earlier, while its open-source software has been installed more than 43 million times, up 134% since December 2025.

Metric	Series D (Feb. 2026)	Series E (Sept. 14, 2026)
Valuation	$5 billion	$12.55 billion
Round size	$300 million	$550 million
Paying customers	—	4,300+ (up 139% year over year)
Team size	—	570 employees (doubled in a year)

Temporal named OpenAI, Snap, Nvidia and JPMorgan Chase as customers, saying Snap's use of the platform now processes 414 million Stories a day and that OpenAI's internal usage grew 60-fold in under a year. Venkat Venkataramani, OpenAI's vice president of infrastructure, said in the announcement that "Durable Execution is more than ever a core requirement for modern AI systems, and Temporal offers a compelling platform to help build it in from the start," adding that this was "one of the main reasons why we invested in building a durable orchestration framework powered by Temporal at OpenAI."

Why a workflow-reliability company is worth more now

Temporal Chief Executive Samar Abbas said "reliability has never been optional, but AI has quickly raised the cost of skipping it, and developers need a foundation for that built in from day one, not bolted on afterward." An investor in the round put a sharper point on the same idea to Pulse2: "the demo is easy, production is hard, because the systems around the models can't handle real-world execution."

That framing explains the multiple better than the growth numbers alone: Temporal is not selling a model or an agent, it is selling the retry-and-recovery layer underneath other companies' AI products, which means its revenue scales with how many AI systems reach production rather than with how many AI systems merely get demoed. Gimlet Labs made a similar bet on AI-inference infrastructure and saw its own valuation move 7.5 times in five months once a fixed number was attached to the business.

Temporal did not say what percentage of its 4,300-plus paying customers use the product specifically for AI workloads versus the non-AI distributed-systems use cases the company was originally built for in 2019, a distinction that would clarify how much of the new valuation is an AI premium versus growth in Temporal's older business. HiddenLayer's most recent Series B came with no disclosed valuation at all; Temporal's willingness to publish an exact number, twice in one year, is itself information about how confident the company is that the next round will only go up.