Temporal raises $550M Series E at a $12.55B valuation

Temporal said it raised $550 million in Series E funding — a late private fundraising round — at a $12.55 billion valuation, led by Lightspeed, to grow the open-source platform companies use to keep long-running software jobs, including AI agents, alive when something fails.

AI demos are cheap. Keeping an agent or a payment running for days is not. A $550 million late-stage check at a $12.55 billion company-stated price is a money-desk read on who pays for that reliability layer.

Temporal Technologies, an open-source software company, said on its newsroom that it raised $550 million in a Series E round at a $12.55 billion valuation. Series E is a late private fundraising round — after seed money and earlier lettered rounds. The $12.55 billion figure is Temporal’s stated price for the whole company at this round. It is not a public-market price. The company page is dated September 14, 2026, San Francisco. That newsroom post is the filing event.

Lightspeed led the round, the newsroom says. Named co-leads: Wellington Management; Growth Equity at Goldman Sachs Alternatives; and Tiger Global. The page also names strong participation from T. Rowe Price — Temporal’s footnote says accounts advised by T. Rowe Price Associates, Inc. — and SV Angel.

Returning investors, as the same page lists them: a16z, Sequoia, Index, GIC, Sapphire Ventures, and Amplify. This is not a claim that this desk saw the cap table.

What the product does, in plain words: Temporal is software that sits under other software. Developers write ordinary code. Temporal saves the job’s place so a payment, an onboarding flow, or an AI agent can crash, wait, or restart and still finish. The company calls that Durable Execution — durable meaning the work’s state is kept, so a failure does not wipe the job. Agentic AI, as used here, means software that takes a sequence of actions, not just answers a question.

Company-reported growth on the newsroom page: Temporal’s annualized revenue run rate — ARR, what yearly sales would look like if the current pace held — recently surpassed $250 million, growing more than 200% year over year. Net dollar retention (NDR) has exceeded 200% since February. NDR asks how much existing customers spend this year versus last, after expansions and cancellations; over 200% means that group, as Temporal tells it, more than doubled its spend. File $250 million, 200%, and NDR as Temporal’s figures. This desk has no audited income statement.

Usage counts, also Temporal’s: Temporal Cloud — the paid hosted service — processed more than 1.9 trillion actions in August, up more than 350% year over year. An action, as the company uses the word, is a unit of work the service processed. Open-source installs surpassed 43 million in August, up 134% since January 2026. Paying customers now exceed 4,300.

Named paying customers on the newsroom page include OpenAI, Snap, NVIDIA, Netflix, and JPMorgan Chase. A longer adoption list on the same page names Anysphere (Cursor), Lovable, Scale AI, Salesforce, Shopify, Booking.com, Block, DoorDash, and “thousands more,” plus the uses Temporal says they run: long-running agents, autonomous-vehicle simulations, payments, and customer operations.

Samar Abbas, co-founder and chief executive, quoted on the newsroom page: “As agents take on more critical work across more systems, every additional step creates another place to fail. In production, that work has to survive those failures and finish reliably.” And: “Durable Execution is becoming the standard for reliable applications at scale, and this investment reflects the conviction that much of the next generation of software will be built on Temporal.” They are not an independent product review.

Anoushka Vaswani, a partner at Lightspeed Venture Partners, quoted on the same page: “Every team building on AI hits the same wall: the demo is easy, production is hard, because the systems around the models can't handle real-world execution.” She said most of the market locks teams into a proprietary stack, and called Temporal “the open, pluggable foundation that runs their agents and the systems they already depend on.” This is not investment advice.

Headcount and use of funds, as Temporal tells it: the team has doubled to 570 employees over the past year. The company says it will expand global operations, deepen platform research and development, grow developer and enterprise go-to-market — sales and marketing to those buyers — and scale the teams and infrastructure behind the next phase. File 570 and the spend plan as company claims.

A same-day Temporal blog by Allanah Hughes repeats the $550 million / $12.55 billion raise and adds company-claimed color that is not on the newsroom lede: Snap moves 414 million Stories a day on Temporal; JPMorgan Chase runs it in regulated production; OpenAI’s use has grown 60-fold in under a year; and Venkat Venkataramani, OpenAI’s vice president of infrastructure, is quoted saying durable execution is “more than ever a core requirement for modern AI systems.” Those are Temporal’s blog figures and a customer quote Temporal published.

Same-day C press, not a second originating source for the raise amount: FinSMEs repeated the $550 million Series E at a $12.55 billion valuation and the investor list. FinSMEs flattens Lightspeed, Wellington, Goldman Sachs Alternatives, and Tiger Global as joint leads — the newsroom’s wording is Lightspeed lead, those three as co-leads.