# First.io funding: rounds and investors

> First.io has raised $5.0M across 1 round since 2018. Investors include MATH Venture Partners, Nine Four Ventures and Mike Golden. Every round with its source.

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

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

# Who invested in *First.io*

One round we have observed, with the 4 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.

Enterprise

Funding summary Updated 26 Oct 2026

**$5.0M** raised across 1 round since 2018, from 1 source

- **Latest round:** Series A, $5.0M May 2018
- **Investors:** 4

See who backed them

## The rounds

- **May 2018** Series A **$5.0M** [MATH Venture Partners](https://millionrounds.com/fund/math-venture-partners) [Nine Four Ventures](https://millionrounds.com/fund/nine-four-ventures) Mike Golden Thad Wong Reported by FinSMEs

## Everyone who backed them

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

[Nine Four Ventures](https://millionrounds.com/fund/nine-four-ventures) VC firm **1** round

Mike Golden no record of our own yet **1** round

Thad Wong 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=first-io).

## Quick answers about First.io

### Who invested in First.io?

First.io's investors include MATH Venture Partners, Nine Four Ventures, Mike Golden and Thad Wong.

### How much has First.io raised?

First.io has raised $5.0M across 1 round since 2018.

### When did First.io last raise?

First.io's most recent round was a Series A of $5.0M in May 2018.

### What was First.io's biggest round?

Its most recent round, $5.0M in May 2018, is also its largest on record.

### Who backed First.io first?

First.io's first round on record, in May 2018, was backed by MATH Venture Partners, Nine Four Ventures and Mike Golden and 1 others.

### What stage is First.io at?

First.io's latest named round is a Series A, in May 2018.

### Where is First.io based?

First.io is based in the United States.

## Companies like First.io

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

[**MURAL** $67M · Oct 2026](https://millionrounds.com/company/mural)[**Fireworks AI** $1.7B · Oct 2026](https://millionrounds.com/company/fireworks-ai)[**Otter.ai** $360M · Oct 2026](https://millionrounds.com/company/otter-ai)[**Town** $241M · Oct 2026](https://millionrounds.com/company/town)[**Opsin** $21M · Oct 2026](https://millionrounds.com/company/opsin)[**Clueso** $11M · Oct 2026](https://millionrounds.com/company/clueso)

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