# Sydnexis funding: rounds and investors

> Sydnexis has raised $45M across 1 round since 2021. Investors include RA Capital Management and Longitude Capital. Every round with its source.

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

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

# Who invested in *Sydnexis*

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.

Manufacturing

Funding summary Updated 26 Oct 2026

**$45M** raised across 1 round since 2021, from 1 source

- **Latest round:** Series B, $45M Aug 2021
- **Investors:** 2

See who backed them

## The rounds

- **Aug 2021** Series B **$45M** [RA Capital Management](https://millionrounds.com/fund/ra-capital-management) [Longitude Capital](https://millionrounds.com/fund/longitude-capital) Source recorded SEC filing: $46M sold, first sale Aug 2021

## Founders and team

From Sydnexis's own website: 5 on the team.

- **Perry J. Sternberg** Chief Executive Officer
- **Paul Chu** Vice President, Finance and Business Development
- **Nick Ruth** Chief Commercial Officer
- **Jeffry Weinhuff** Chairman of the Board of Sydnexis
- **Laura Scott** Executive Business Partner to Perry Sternberg

## Everyone who backed them

[RA Capital Management](https://millionrounds.com/fund/ra-capital-management) Private equity **1** round

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

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

## Also claim to have backed them

These 2 firms list Sydnexis 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.

[Bluestem Capital](https://millionrounds.com/fund/bluestem-capital-company-llc) Private equity Per its own site

[Visionary Ventures Fund](https://millionrounds.com/fund/visionary-ventures-fund) VC firm Per its own site

## Quick answers about Sydnexis

### Who invested in Sydnexis?

Sydnexis's investors include RA Capital Management and Longitude Capital.

### How much has Sydnexis raised?

Sydnexis has raised $45M across 1 round since 2021.

### When did Sydnexis last raise?

Sydnexis's most recent round was a Series B of $45M in Aug 2021.

### What was Sydnexis's biggest round?

Its most recent round, $45M in Aug 2021, is also its largest on record.

### Who backed Sydnexis first?

Sydnexis's first round on record, in Aug 2021, was backed by RA Capital Management and Longitude Capital.

### What stage is Sydnexis at?

Sydnexis's latest named round is a Series B, in Aug 2021.

### Where is Sydnexis based?

Sydnexis is based in the United States.

## Companies like Sydnexis

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

[**Apex** $1.1B · Oct 2026](https://millionrounds.com/company/apex)[**ZwitterCo** $58M · Oct 2026](https://millionrounds.com/company/zwitterco)[**Peak Energy** $163M · Oct 2026](https://millionrounds.com/company/peak-energy)[**Arda** $233M · Oct 2026](https://millionrounds.com/company/arda)[**Origin** $121M · Oct 2026](https://millionrounds.com/company/origin)[**Jeevy Fabrication** Oct 2026](https://millionrounds.com/company/jeevy-fabrication)

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