# ROSI funding: rounds and investors

> ROSI has raised $23M across 2 rounds since 2024. Investors include Bpifrance, EIT InnoEnergy and EIC Accelerator. Every round with its source.

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

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

# Who invested in *ROSI*

2 rounds we have observed, with the 3 investors 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.

Energy

Raised 7 months ago

Funding summary Updated 26 Oct 2026

**$23M** raised across 2 rounds since 2024, from 2 sources

- **Latest round:** Series B, $23M Apr 2026
- **Investors:** 3

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.

2025 2026

**?** Venture

**$23M** Series B

- **First round:** Venture
- **Biggest round:** $23M
- **Between rounds:** 21 months

## The rounds

- **Apr 2026** Series B **$23M** *2 returning* [Bpifrance](https://millionrounds.com/fund/bpifrance) [EIT InnoEnergy](https://millionrounds.com/fund/innoenergy) Source recorded
- **Jul 2024** Venture **Amount undisclosed** *3 new* [Bpifrance](https://millionrounds.com/fund/bpifrance) [EIC Accelerator](https://millionrounds.com/fund/eic-accelerator) [EIT InnoEnergy](https://millionrounds.com/fund/innoenergy) Source recorded

## Founders and team

From ROSI's own website: 1 founder, 2 on the team.

**Yun Luo** CEO & Co-Founder

- **Antoine Chalaux** COO
- **Didier Bondil** Industrial Director

## Who was in which round

The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.

**Venture** 2024 **Series B** 2026 [Bpifrance](https://millionrounds.com/fund/bpifrance) [EIT InnoEnergy](https://millionrounds.com/fund/innoenergy) [EIC Accelerator](https://millionrounds.com/fund/eic-accelerator)

## Everyone who backed them

[Bpifrance](https://millionrounds.com/fund/bpifrance) Government **2** rounds

[EIT InnoEnergy](https://millionrounds.com/fund/innoenergy) VC firm **2** rounds

[EIC Accelerator](https://millionrounds.com/fund/eic-accelerator) Government **1** round

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

## Quick answers about ROSI

### Who invested in ROSI?

ROSI's investors include Bpifrance, EIT InnoEnergy and EIC Accelerator.

### How much has ROSI raised?

ROSI has raised $23M across 2 rounds since 2024. One round did not disclose an amount, so the total is a floor.

### When did ROSI last raise?

ROSI's most recent round was a Series B of $23M in Apr 2026.

### What was ROSI's biggest round?

Its most recent round, $23M in Apr 2026, is also its largest on record.

### Who backed ROSI first?

ROSI's first round on record, in Jul 2024, was backed by Bpifrance, EIC Accelerator and EIT InnoEnergy.

### What stage is ROSI at?

ROSI's latest named round is a Series B, in Apr 2026.

### Where is ROSI based?

ROSI is based in France.

## Companies like ROSI

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

[**Elax Energy** $34M · Oct 2026](https://millionrounds.com/company/elax-energy)[**EPYR** $20M · Oct 2026](https://millionrounds.com/company/epyr)[**HyLight** $18M · Oct 2026](https://millionrounds.com/company/hylight)[**Voltheia** $5.4M · Aug 2026](https://millionrounds.com/company/voltheia)[**Technip Energies** $1.4B · Jun 2026](https://millionrounds.com/company/technip-energies)[**Mantle8** $38M · May 2026](https://millionrounds.com/company/mantle8)

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