# Atonarp funding: rounds and investors

> Atonarp has raised $57M across 3 rounds since 2014. Investors include Walden Riverwood Ventures and Innovative Network Corporation of Japan.

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

Japan · [Series C startup](https://millionrounds.com/companies)

# Who invested in *Atonarp*

3 rounds we have observed, with the 2 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.

Biotech Healthcare

Funding summary Updated 26 Oct 2026

**$57M** raised across 3 rounds since 2014, from 3 sources

**$8.0M** Series A **$16M** Round **$33M** Series C

- **Latest round:** Series C, $33M Aug 2019
- **Step-up i:** 2.1×
- **Investors:** 2

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.

2015 2016 2017 2018 2019

**$8.0M** Series A

**$16M** Round

**$33M** Series C

- **First round:** Series A, $8.0M
- **Biggest round:** $33M
- **Usual gap between rounds:** 3.1 years

## The rounds

- **Aug 2019** Series C **$33M** No investor was named in the report. Reported by Markets
- **Jul 2016** Round **$16M** *1 new* Innovative Network Corporation of Japan Reported by FinSMEs
- **Aug 2014** Series A **$8.0M** *1 new* [Walden Riverwood Ventures](https://millionrounds.com/fund/walden-riverwood-ventures) From a historical funding record

## 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.

**Series A** 2014 **Round** 2016 **Series C** 2019 [Walden Riverwood Ventures](https://millionrounds.com/fund/walden-riverwood-ventures) Innovative Network Corporation of Japan

## Everyone who backed them

[Walden Riverwood Ventures](https://millionrounds.com/fund/walden-riverwood-ventures) VC firm **1** round

Innovative Network Corporation of Japan no record of our own yet **1** round

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

## Also claim to have backed them

This firm lists Atonarp 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.

[Open Field Capital](https://millionrounds.com/fund/open-field-capital) VC firm Per its own site

## Quick answers about Atonarp

### Who invested in Atonarp?

Atonarp's investors include Walden Riverwood Ventures and Innovative Network Corporation of Japan.

### How much has Atonarp raised?

Atonarp has raised $57M across 3 rounds since 2014.

### When did Atonarp last raise?

Atonarp's most recent round was a Series C of $33M in Aug 2019.

### What was Atonarp's biggest round?

Its most recent round, $33M in Aug 2019, is also its largest on record.

### Who backed Atonarp first?

Atonarp's first round on record, in Aug 2014, was backed by Walden Riverwood Ventures.

### What stage is Atonarp at?

Atonarp's latest named round is a Series C, in Aug 2019.

### Where is Atonarp based?

Atonarp is based in Japan.

## Companies like Atonarp

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

[**Kinish** $35M · Oct 2026](https://millionrounds.com/company/kinish)[**RadioNano Therapeutics** $955K · Oct 2026](https://millionrounds.com/company/radionano-therapeutics)[**AI Dock** $1.6M · Aug 2026](https://millionrounds.com/company/ai-dock)[**Dioseve** $12M · Jun 2026](https://millionrounds.com/company/dioseve)[**CareLink** $1.5M · Jun 2026](https://millionrounds.com/company/carelink)[**Neusignal Therapeutics** $40M · Jun 2026](https://millionrounds.com/company/neusignal-therapeutics)

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