# Theseus funding: rounds and investors

> Theseus has raised $4.3M across 1 round since 2025. Investors include First Round Capital, Y Combinator and Pioneer Fund. Every round with its source.

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

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

# Who invested in *Theseus*

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.

Defence Tech Drones Hardware & Electronics Software

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Funding summary Updated 15 Nov 2026

**$4.3M** raised across 1 round since 2025, from 1 source

- **Latest round:** Seed, $4.3M Apr 2025
- **Led by:** First Round Capital
- **Investors:** 4 (1 led)

See who backed them

## The rounds

- **Apr 2025** Seed **$4.3M** [First Round Capital](https://millionrounds.com/fund/first-round-capital) Lead [Y Combinator](https://millionrounds.com/fund/y-combinator) [Pioneer Fund](https://millionrounds.com/fund/pioneer-fund-2) [Lux Capital](https://millionrounds.com/fund/lux-capital) Reported by TechCrunch

## Founders and team

From Theseus's own website: 2 on the team.

- **Ian Laffey** Chief Executive Officer
- **Sacha Lévy** Chief Technology Officer

## Everyone who backed them

[First Round Capital](https://millionrounds.com/fund/first-round-capital) VC firm **1** round, led 1

[Y Combinator](https://millionrounds.com/fund/y-combinator) Accelerator **1** round

[Pioneer Fund](https://millionrounds.com/fund/pioneer-fund-2) Private equity **1** round

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

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

## Quick answers about Theseus

### Who invested in Theseus?

Theseus's investors include First Round Capital, Y Combinator, Pioneer Fund and Lux Capital. First Round Capital led its latest round.

### How much has Theseus raised?

Theseus has raised $4.3M across 1 round since 2025.

### When did Theseus last raise?

Theseus's most recent round was a Seed of $4.3M in Apr 2025, led by First Round Capital.

### What was Theseus's biggest round?

Its most recent round, $4.3M in Apr 2025, is also its largest on record.

### Who backed Theseus first?

Theseus's first round on record, in Apr 2025, was backed by First Round Capital, Y Combinator and Pioneer Fund and 1 others.

### What stage is Theseus at?

Theseus's latest named round is a Seed, in Apr 2025.

### Where is Theseus based?

Theseus is based in the United States.

### Who led Theseus's rounds?

First Round Capital led the Seed in 2025.

## Companies like Theseus

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

[**VulcanForms** $720M · Nov 2026](https://millionrounds.com/company/vulcanforms)[**Axle** $12M · Nov 2026](https://millionrounds.com/company/axle)[**Luminal** $28M · Nov 2026](https://millionrounds.com/company/luminal)[**Mirendil** $1.4B · Nov 2026](https://millionrounds.com/company/mirendil)[**StitchStudio** $8.0M · Nov 2026](https://millionrounds.com/company/stitchstudio)[**Vinny** $2.5M · Nov 2026](https://millionrounds.com/company/vinny)

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