# FirstString funding: rounds and investors

> FirstString has raised $15M across 2 rounds since 2008. Investors include Park West and Sophos Capital. Every round with its source.

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

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

# Who invested in *FirstString*

2 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

**$15M** raised across 2 rounds since 2008, from 2 sources

**$200K** Seed **$15M** Round

- **Latest round:** Round, $15M Jan 2018
- **Step-up i:** 75×
- **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.

2008 2010 2012 2014 2016 2018

**$200K** Seed

**$15M** Round

- **First round:** Seed, $200K
- **Biggest round:** $15M
- **Between rounds:** 9.9 years

## The rounds

- **Jan 2018** Round **$15M** *2 new* Park West Sophos Capital Reported by Postandcourier
- **Mar 2008** Seed **$200K** No investor was named in the report. Reported by tradingmarkets.com

## 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.

**Seed** 2008 **Round** 2018 Park West Sophos Capital

## Everyone who backed them

Park West no record of our own yet **1** round

Sophos Capital 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=firststring).

## Quick answers about FirstString

### Who invested in FirstString?

FirstString's investors include Park West and Sophos Capital.

### How much has FirstString raised?

FirstString has raised $15M across 2 rounds since 2008.

### When did FirstString last raise?

FirstString's most recent round was an Undisclosed round of $15M in Jan 2018.

### What was FirstString's biggest round?

Its most recent round, $15M in Jan 2018, is also its largest on record.

### Who backed FirstString first?

FirstString's first round on record, in Jan 2018, was backed by Park West and Sophos Capital.

### What stage is FirstString at?

FirstString's latest named round is an Undisclosed round, in Jan 2018.

### Where is FirstString based?

FirstString is based in the United States.

## Companies like FirstString

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)[**Prolific Machines** $105M · Oct 2026](https://millionrounds.com/company/prolific-machines)[**AI** $18M · Oct 2026](https://millionrounds.com/company/ai)[**Baba** $40M · Oct 2026](https://millionrounds.com/company/baba)[**IMIO** $19M · Oct 2026](https://millionrounds.com/company/imio)

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