# Hephaestus funding: rounds and investors

> Hephaestus has raised $17M across 1 round since 2026. Investors include CiRi Ventures, Climate Capital and Unruly Capital. Every round with its source.

Source: https://millionrounds.com/company/hephaestus (Millionrounds; every figure on the page links to its filing or article)

United Kingdom · [Series A startup](https://millionrounds.com/companies)

# Who invested in *Hephaestus*

One round we have observed, with the 5 investors named in it. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.

Chemicals & Materials Energy

Raised this month

Funding summary Updated 26 Oct 2026

**$17M** raised across 1 round since 2026, from 1 source

- **Latest round:** Series A, $17M Oct 2026
- **Led by:** CiRi Ventures
- **Investors:** 5 (1 led)

See who backed them

## The rounds

- **Oct 2026** Series A **$17M** [CiRi Ventures](https://millionrounds.com/fund/ciri-ventures) Lead [Climate Capital](https://millionrounds.com/fund/climate-capital) [Unruly Capital](https://millionrounds.com/fund/unruly-capital) [Teampact ventures](https://millionrounds.com/fund/teampact-ventures) [Prescience Ventures](https://millionrounds.com/fund/prescience-ventures) Reported by Pulse 2.0

## Everyone who backed them

[CiRi Ventures](https://millionrounds.com/fund/ciri-ventures) VC firm **1** round, led 1

[Climate Capital](https://millionrounds.com/fund/climate-capital) VC firm **1** round

[Unruly Capital](https://millionrounds.com/fund/unruly-capital) VC firm **1** round

[Teampact ventures](https://millionrounds.com/fund/teampact-ventures) Private equity **1** round

[Prescience Ventures](https://millionrounds.com/fund/prescience-ventures) VC firm **1** round

Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=hephaestus).

## Quick answers about Hephaestus

### Who invested in Hephaestus?

Hephaestus's investors include CiRi Ventures, Climate Capital, Unruly Capital, Teampact ventures and Prescience Ventures. CiRi Ventures led its latest round.

### How much has Hephaestus raised?

Hephaestus has raised $17M across 1 round since 2026.

### When did Hephaestus last raise?

Hephaestus's most recent round was a Series A of $17M in Oct 2026, led by CiRi Ventures.

### What was Hephaestus's biggest round?

Its most recent round, $17M in Oct 2026, is also its largest on record.

### Who backed Hephaestus first?

Hephaestus's first round on record, in Oct 2026, was backed by CiRi Ventures, Climate Capital and Unruly Capital and 2 others.

### What stage is Hephaestus at?

Hephaestus's latest named round is a Series A, in Oct 2026.

### Where is Hephaestus based?

Hephaestus is based in the United Kingdom.

### Who led Hephaestus's rounds?

CiRi Ventures led the Series A in 2026.

## Companies like Hephaestus

In the same sector, and raised in the last eighteen months.

[**Adaptavate** $15M · Oct 2026](https://millionrounds.com/company/adaptavate)[**novosound** $8.7M · Sept 2026](https://millionrounds.com/company/novosound)[**Dragonfly Advanced Materials** $2.0M · Sept 2026](https://millionrounds.com/company/dragonfly-advanced-materials)[**Metris Energy** $7.5M · Sept 2026](https://millionrounds.com/company/metris-energy)[**Eterna Regeneratives** $4.0M · Sept 2026](https://millionrounds.com/company/eterna-regeneratives)[**AcouBatt** $3.0M · Sept 2026](https://millionrounds.com/company/acoubatt)

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