# Efference funding: rounds and investors

> Efference has raised $500K across 1 round since 2025. Investors include Y Combinator and 500 Global. Every round with its source.

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

United States · [Pre-seed startup](https://millionrounds.com/companies)

# Who invested in *Efference*

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.

AI

Raised 12 months ago

Funding summary Updated 26 Oct 2026

**$500K** raised across 1 round since 2025, from 1 source

- **Latest round:** Pre-seed, $500K Nov 2025
- **Investors:** 2

See who backed them

## The rounds

- **Nov 2025** Pre-seed **$500K** [Y Combinator](https://millionrounds.com/fund/y-combinator) [500 Global](https://millionrounds.com/fund/500-startups) Source recorded

## Everyone who backed them

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

[500 Global](https://millionrounds.com/fund/500-startups) Angel **1** round

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

## Also claim to have backed them

These 2 firms list Efference 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.

[ANTI FUND](https://millionrounds.com/fund/anti-fund) VC firm Per its own site

[Sugar Free Capital](https://millionrounds.com/fund/sugar-free-capital) VC firm Per its own site

## Quick answers about Efference

### Who invested in Efference?

Efference's investors include Y Combinator and 500 Global.

### How much has Efference raised?

Efference has raised $500K across 1 round since 2025.

### When did Efference last raise?

Efference's most recent round was a Pre-seed of $500K in Nov 2025.

### What was Efference's biggest round?

Its most recent round, $500K in Nov 2025, is also its largest on record.

### Who backed Efference first?

Efference's first round on record, in Nov 2025, was backed by Y Combinator and 500 Global.

### What stage is Efference at?

Efference's latest named round is a Pre-seed, in Nov 2025.

### Where is Efference based?

Efference is based in the United States.

## Companies like Efference

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

[**SpaceX** $42B · Oct 2026](https://millionrounds.com/company/spacex)[**xPay** $1.5M · Oct 2026](https://millionrounds.com/company/xpay)[**Albert Invent** $20M · Oct 2026](https://millionrounds.com/company/albert-invent)[**FORT Robotics** $39M · Oct 2026](https://millionrounds.com/company/fort-robotics)[**Pika** $216M · Oct 2026](https://millionrounds.com/company/pika)[**Vertical Semiconductor** $84M · Oct 2026](https://millionrounds.com/company/vertical-semiconductor)

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