---
title: "Temporal’s $550M Series E Is $12.55B — ARR Dollars Still Missing"
description: "Temporal announced a $550 million Series E at $12.55 billion on September 14, 2026, more than doubling the February $5 billion Series D in seven months. Lightspeed co-led with Wellington, Goldman Sachs Alternatives, and Tiger Global. The company printed usage and growth rates, not ARR dollars. Reuters $12.6 billion is rounding."
date: 2026-09-15T00:00:00.000Z
source: https://venturecapitaltracker.com/2026-temporal-550m-series-e-12-55b-lightspeed
---

# Temporal’s $550M Series E Is $12.55B — ARR Dollars Still Missing

> Temporal announced a $550 million Series E at $12.55 billion on September 14, 2026, more than doubling the February $5 billion Series D in seven months. Lightspeed co-led with Wellington, Goldman Sachs Alternatives, and Tiger Global. The company printed usage and growth rates, not ARR dollars. Reuters $12.6 billion is rounding.

**[Temporal](/startup/temporal)** announced a **$550 million** Series E at **$12.55 billion** on **September 14, 2026**. That is **2.5×** the February **$5 billion** Series D in **seven months**. [Lightspeed](/fund/lightspeed-venture-partners-nyc) co-led with Wellington Management, Growth Equity at Goldman Sachs Alternatives, and [Tiger Global](/fund/tiger-global-management). The [company blog](https://temporal.io/blog/temporal-raises-usd550m-series-e-at-usd12-55b-valuation-ai) is the primary. [Reuters](https://www.reuters.com/business/temporals-valuation-spikes-126-billion-lightspeed-led-funding-round-2026-09-14/) matches **$12.55 billion** and rounds the headline to **$12.6 billion**. Last verified **September 15, 2026**.

The number that will get copied wrong is treating **$12.55 billion** as a multiple of a printed ARR. There is **no ARR dollar** in the Series E post. Temporal printed **growth rates** and **usage**.

This is temporal.io (Seattle). It is the durable-execution company, not a time-series database.

## Five-minute decision

| If you need… | Verdict |
| --- | --- |
| What happened | **Funded.** $550M Series E, Sep 14. Company: Lightspeed **co-led** with Wellington, GS Alternatives, Tiger. |
| Valuation | **$12.55B.** Reuters headline **$12.6B** is rounding. Feb mark was **$5B**. |
| vs August talks | Bloomberg Aug 18: ~**$500M** at **≥$12B pre-money**, not closed. This is the company close. Pre/post **not labeled**. |
| ARR | **Not disclosed.** Run-rate **up >200%** YoY and NDR **>200%** since February are company growth claims. |
| Whether to diligence | **Yes**, if you underwrite workflow infra off usage + NDR. **No**, if you need a dollar ARR or the primary/secondary split. |

**Investigate further when:** a 2.5× mark-up in seven months on durable execution is the bet, and usage (1.9 trillion August billable actions; 4,300 paying customers) is enough to start.

**Wait or pass when:** you need ARR dollars, cheque sizes, or whether $12.55 billion is pre-money or post-money.

## What closed

| Field | Detail |
| --- | --- |
| Company | [Temporal](/startup/temporal) (temporal.io); Seattle; founded **2019**; CEO Samar Abbas; co-founder Maxim Fateev |
| Round | **$550M Series E** at **$12.55B** · **Sep 14, 2026** |
| Lead / co-leads | Company: [Lightspeed](/fund/lightspeed-venture-partners-nyc) **co-led**, with Wellington, GS Alternatives Growth Equity, and [Tiger Global](/fund/tiger-global-management). Reuters: Lightspeed **led**; the other three **joined as co-leads**. |
| Also in | T. Rowe Price, SV Angel. Returning: [a16z](/fund/andreessen-horowitz), [Sequoia](/fund/sequoia), [Index](/fund/index-ventures), GIC, Sapphire Ventures, Amplify |
| Prior priced stack | **$300M Series D at $5B post-money**, Feb 17, 2026, a16z led ([company](https://temporal.io/blog/temporal-raises-usd300m-series-d-at-a-usd5b-valuation); [Series D memo](/2026-temporal-300m-series-d-durable-execution)) |
| Customers | **>4,300** paying, **+139%** YoY (company). Named: [OpenAI](/startup/openai), Snap, NVIDIA, JPMorgan Chase. Snap: **414 million** Stories/day on Temporal. OpenAI usage **60-fold** in under a year — company, via OpenAI VP of Infrastructure quote |
| Usage | **1.9 trillion** billable actions in **August**, **+350%** YoY. Open-source installs **43 million**, **+134%** since Dec 2025 |
| Headcount | **570**, doubled over the prior year (company) |
| Missing | ARR **dollars**. Primary vs secondary. Cheque sizes. Pre vs post. Legal close date vs announcement date |

There is **no** Wellington, Goldman, GIC, Sapphire, Amplify, T. Rowe, or SV Angel `/fund/` page. Do not invent them.

August 18 talks are **superseded**. Use **$12.55 billion** until Temporal restates it.

## Growth rates are not a revenue stock

If you need a multiple, you do not have the denominator. **>200%** run-rate growth and **>200%** NDR since February can be true at many absolute sizes. Customer count **+139%** and August actions **+350%** are the usage spine. They are not ARR.

[Clay](/startup/clay)’s same-month [Series D](/2026-clay-115m-series-d-7-1b-wellington) has the same Wellington problem in reverse: a **$7.1 billion** mark with a **December 2025** ARR print. Temporal has the fresh mark and **no** ARR print. [Harvey](/startup/harvey)’s [Lightspeed-co-led $550 million](/2026-harvey-550m-15-5b-lightspeed-diffusion) is a different product (legal AI) on the same week’s $550 million tape — do not merge the two.

[Rillet](/2026-rillet-100m-series-c-1b-iconiq) named Temporal as a customer in August, when the $12 billion figure was still talks.

Related: [Temporal profile](/startup/temporal) · [Series D](/2026-temporal-300m-series-d-durable-execution) · [Sep 14–15 index](/2026-september-14-15-investment-news-temporal-cornelis-openai) · [Seattle map](/seattle-startups-we-cover-2026) · [September hub](/2026-september-vc-news).

**By:** [Venture Capital Tracker](https://venturecapitaltracker.com/editorial-policy)
**Last updated:** September 15, 2026

**Editorial note:** AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.