# Cylinder funding: rounds and investors

> Cylinder has raised $31M across 1 round since 2023. Investors include Human Capital and FCA Venture Partners. Every round with its source.

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

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

# Who invested in *Cylinder*

One round we have observed, with the 2 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.

Healthcare

Funding summary Updated 26 Oct 2026

**$31M** raised across 1 round since 2023, from 1 source

- **Latest round:** Series B, $31M Sept 2023
- **Investors:** 2

See who backed them

## The rounds

- **Sept 2023** Series B **$31M** [Human Capital](https://millionrounds.com/fund/human-capital-2) [FCA Venture Partners](https://millionrounds.com/fund/fca-venture-partners) Source recorded

## Everyone who backed them

[Human Capital](https://millionrounds.com/fund/human-capital-2) Growth equity **1** round

[FCA Venture Partners](https://millionrounds.com/fund/fca-venture-partners) VC firm **1** round

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

## Also claim to have backed them

This firm lists Cylinder as a portfolio company on their own website, but no report of a round names it. They are the firms' own claims, kept apart from the rounds above.

[SemperVirens Venture Capital](https://millionrounds.com/fund/sempervirens-venture-capital) VC firm Per its own site

## Quick answers about Cylinder

### Who invested in Cylinder?

Cylinder's investors include Human Capital and FCA Venture Partners.

### How much has Cylinder raised?

Cylinder has raised $31M across 1 round since 2023.

### When did Cylinder last raise?

Cylinder's most recent round was a Series B of $31M in Sept 2023.

### What was Cylinder's biggest round?

Its most recent round, $31M in Sept 2023, is also its largest on record.

### Who backed Cylinder first?

Cylinder's first round on record, in Sept 2023, was backed by Human Capital and FCA Venture Partners.

### What stage is Cylinder at?

Cylinder's latest named round is a Series B, in Sept 2023.

### Where is Cylinder based?

Cylinder is based in the United States.

## Companies like Cylinder

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

[**Star Therapeutics** $325M · Oct 2026](https://millionrounds.com/company/star-therapeutics)[**Promaxo** $106M · Oct 2026](https://millionrounds.com/company/promaxo)[**AI** $18M · Oct 2026](https://millionrounds.com/company/ai)[**Baba** $40M · Oct 2026](https://millionrounds.com/company/baba)[**Rejuvenate Bio** $13M · Oct 2026](https://millionrounds.com/company/rejuvenate-bio)[**Clinical Ink** $24M · Oct 2026](https://millionrounds.com/company/clinical-ink)

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