# 51toCarbonZero funding: rounds and investors

> 51toCarbonZero has raised $4.3M across 2 rounds since 2021. Investors include Fuel Ventures. Every round with its source.

Source: https://millionrounds.com/company/51-to-carbon-zero (Millionrounds; every figure on the page links to its filing or article)

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

# Who invested in *51toCarbonZero*

2 rounds we have observed, with the one investor named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.

Climate Tech

Funding summary Updated 26 Oct 2026

**$4.3M** raised across 2 rounds since 2021, from 2 sources

**$346K** Round **$4.0M** Seed

- **Latest round:** Seed, $4.0M Apr 2025
- **Step-up i:** 11.6×
- **Investors:** 1

See who backed them

## The funding story

Each circle is a round, placed by date and sized by amount. The line above is the running total.

2022 2023 2024 2025

**$346K** Round

**$4.0M** Seed

- **First round:** Round, $346K
- **Biggest round:** $4.0M
- **Between rounds:** 3.8 years

## The rounds

- **Apr 2025** Seed **$4.0M** *1 new* [Fuel Ventures](https://millionrounds.com/fund/fuel-ventures) Source recorded
- **Jul 2021** Round **$346K** No investor was named in the report. Shares issued, filed with Companies House (SH01); no report of this raise yet

## Everyone who backed them

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

Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=51-to-carbon-zero).

## Quick answers about 51toCarbonZero

### Who invested in 51toCarbonZero?

51toCarbonZero's investors include Fuel Ventures.

### How much has 51toCarbonZero raised?

51toCarbonZero has raised $4.3M across 2 rounds since 2021.

### When did 51toCarbonZero last raise?

51toCarbonZero's most recent round was a Seed of $4.0M in Apr 2025.

### What was 51toCarbonZero's biggest round?

Its most recent round, $4.0M in Apr 2025, is also its largest on record.

### Who backed 51toCarbonZero first?

51toCarbonZero's first round on record, in Apr 2025, was backed by Fuel Ventures.

### What stage is 51toCarbonZero at?

51toCarbonZero's latest named round is a Seed, in Apr 2025.

### Where is 51toCarbonZero based?

51toCarbonZero is based in the United Kingdom.

## Companies like 51toCarbonZero

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

[**Adaptavate** $15M · Oct 2026](https://millionrounds.com/company/adaptavate)[**Metris Energy** $7.5M · Sept 2026](https://millionrounds.com/company/metris-energy)[**Isometric** $50M · Sept 2026](https://millionrounds.com/company/isometric)[**Breathe Battery Technologies** $132M · Aug 2026](https://millionrounds.com/company/breathe-battery-technologies)[**BE Design** Aug 2026](https://millionrounds.com/company/be-design)[**Oshen** $5.0M · Aug 2026](https://millionrounds.com/company/oshen)

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