# CleanFiber funding: rounds and investors

> CleanFiber has raised $4.5M across 1 round since 2026. Investors include National Science Foundation, Global Brain Corporation and Climate Capital.

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

United States · [Funded startup](https://millionrounds.com/companies)

# Who invested in *CleanFiber*

One round we have observed, with the 3 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.

Construction

Raised 4 months ago

Funding summary Updated 26 Oct 2026

**$4.5M** raised across 1 round since 2026, from 1 source

- **Latest round:** Round, $4.5M Jul 2026
- **Investors:** 3

See who backed them

## The rounds

- **Jul 2026** Round **$4.5M** [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) [Global Brain Corporation](https://millionrounds.com/fund/global-brain-corporation) [Climate Capital](https://millionrounds.com/fund/climate-capital) Source recorded SEC filing: $4.5M sold

## Founders and team

From CleanFiber's own website: 6 on the team.

- **Sami Rahman** CEO
- **Erik Gregory** Chief Financial Officer
- **Alexandre Martin-Min** Director
- **Nate Lowbeer-Lewis** Chairman
- **Noah Lerner** Director
- **Paul Atkinson** Director

## Everyone who backed them

[National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) Government **1** round

[Global Brain Corporation](https://millionrounds.com/fund/global-brain-corporation) VC firm **1** round

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

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

## Also claim to have backed them

These 4 firms list CleanFiber as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.

[Keiretsu Capital](https://millionrounds.com/fund/keiretsu-capital) VC firm Per its own site

[Boston Harbor Angels](https://millionrounds.com/fund/boston-harbor-angels) Angel network Per its own site

[Clean Energy Venture](https://millionrounds.com/fund/clean-energy-venture-group) Angel network Per its own site

[Trendwell Ventures Inc.](https://millionrounds.com/fund/trendwell-ventures-inc) Advisor Per its own site

## Quick answers about CleanFiber

### Who invested in CleanFiber?

CleanFiber's investors include National Science Foundation, Global Brain Corporation and Climate Capital.

### How much has CleanFiber raised?

CleanFiber has raised $4.5M across 1 round since 2026.

### When did CleanFiber last raise?

CleanFiber's most recent round was an Undisclosed round of $4.5M in Jul 2026.

### What was CleanFiber's biggest round?

Its most recent round, $4.5M in Jul 2026, is also its largest on record.

### Who backed CleanFiber first?

CleanFiber's first round on record, in Jul 2026, was backed by National Science Foundation, Global Brain Corporation and Climate Capital.

### What stage is CleanFiber at?

CleanFiber's latest named round is an Undisclosed round, in Jul 2026.

### Where is CleanFiber based?

CleanFiber is based in the United States.

## Companies like CleanFiber

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

[**xPay** $1.5M · Oct 2026](https://millionrounds.com/company/xpay)[**Pennsylvania American Water** $43M · Oct 2026](https://millionrounds.com/company/pennsylvania-american-water)[**Mach9** $46M · Oct 2026](https://millionrounds.com/company/mach9)[**Fireworks AI** $1.7B · Oct 2026](https://millionrounds.com/company/fireworks-ai)[**ASI** $325M · Oct 2026](https://millionrounds.com/company/asi)[**Fragment** $22M · Oct 2026](https://millionrounds.com/company/fragment)

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