# Horizon3 raises $250M Series E led by New Enterprise Associates

> Horizon3, based in United States, has raised $250M in a Series E led by New Enterprise Associates and NightDragon, announced on 3 August 2026.

Source: https://millionrounds.com/news/rounds/horizon3-series-e-2026-08 (Millionrounds; every figure on the page links to its filing or article)

Raised **$250M** 4 sources reported it

Stage **Series E** first round on record

Investors **12** 2 named as lead

Where **US** United States

AI Cybersecurity

## How big is it?

Against every equity round we recorded in the twelve months to 3 August 2026. Ranks count companies, so the same raise reported twice is counted once.

**#191** equity round of the last twelve months

**#21** Series E of 35 in that time

**#134** round in United States, of 1,080

This round **$250M**

Median Series E **$314M**

Below the median Series E of the last twelve months.

## Who invested

- [**New Enterprise Associates** 82 rounds in the last twelve months *Led*](https://millionrounds.com/fund/new-enterprise-associates)
- [**NightDragon** 4 rounds in the last twelve months *Led*](https://millionrounds.com/fund/nightdragon)

Also in the round

- [Craft Ventures](https://millionrounds.com/fund/craft-ventures)
- [SignalFire](https://millionrounds.com/fund/signalfire)
- [Sapphire Ventures](https://millionrounds.com/fund/sapphire-ventures)
- [Acrew Capital](https://millionrounds.com/fund/acrew-capital)
- [Ridge Ventures](https://millionrounds.com/fund/ridge-ventures)
- [Qualcomm Ventures](https://millionrounds.com/fund/qualcomm-ventures)
- [Prosperity7 Ventures](https://millionrounds.com/fund/prosperity7-ventures)
- [PSG](https://millionrounds.com/fund/providence-equity-partners)
- [Blue Cloud Ventures](https://millionrounds.com/fund/blue-cloud-ventures)
- [Demeter Group](https://millionrounds.com/fund/demeter-group)

## Funding history

- August 2026 Series E **$250M**

This is the first round we hold for the company.

## Reported by

- TechCrunch 3 August
- TechStartups 3 August
- Ventureburn 3 August
- NightDragon 3 August

The round's figures come from these reports; each link opens the original.

## Other big rounds that week

[**Firmus Technologies** $2.0B Growth](https://millionrounds.com/news/rounds/firmus-technologies-growth-round-2026-08)[**Lumilens** $700M Series C](https://millionrounds.com/news/rounds/lumilens-series-c-2026-08)[**Hadrian** $1.4B Growth](https://millionrounds.com/news/rounds/hadrian-growth-round-2026-08)[**Moove** $250M Series C](https://millionrounds.com/news/rounds/moove-series-c-2026-08)[**ICEYE** $1.2B Series F](https://millionrounds.com/news/rounds/iceye-series-f-2026-08)[**HappyRobot** $150M Series C](https://millionrounds.com/news/rounds/happyrobot-series-c-2026-08)

[The company **Horizon3 on Millionrounds** *→*](https://millionrounds.com/company/horizon3)[Weekly roundup **Week of 3 August** *→*](https://millionrounds.com/news/weekly/2026-08-03)[Monthly roundup **August 2026** *→*](https://millionrounds.com/news/monthly/2026-08)

**How this article is made**

We write one for every equity round of $100M or more that at least two sources reported. It is put together from our record of rounds, not rewritten from the reports: the ranks and medians count every equity round we read in the twelve months to the round's date. [How we read rounds](https://millionrounds.com/methodology) · [Report a mistake](https://millionrounds.com/corrections)