# Sift Biosciences funding: rounds and investors

> Sift Biosciences has raised $3.8M across 1 round since 2025. Investors include Isai and Vision Ventures. Every round with its source.

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

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

# Who invested in *Sift Biosciences*

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.

Pharma

Raised 11 months ago

Funding summary Updated 26 Oct 2026

**$3.8M** raised across 1 round since 2025, from 1 source

- **Latest round:** Pre-seed, $3.8M Dec 2025
- **Investors:** 2

See who backed them

## The rounds

- **Dec 2025** Pre-seed **$3.8M** [Isai](https://millionrounds.com/fund/isai) [Vision Ventures](https://millionrounds.com/fund/vision-ventures) Source recorded SEC filing: $3.8M sold, first sale Nov 2025

## Founders and team

From Sift Biosciences's own website: 1 founder, 2 on the team.

**Maddie Williams** Founder & CTO

- **Andrew Conroy** Principal Scientist
- **MaryClare Rollins** Senior Scientist

## Everyone who backed them

[Isai](https://millionrounds.com/fund/isai) VC firm **1** round

[Vision Ventures](https://millionrounds.com/fund/vision-ventures) VC firm **1** round

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

## Also claim to have backed them

This firm lists Sift Biosciences as a portfolio company on their own website, but no report of a round names it. They are the firms' own claims, kept apart from the rounds above.

[Lifespan Vision Ventures](https://millionrounds.com/fund/lifespan-vision-ventures) VC firm Per its own site

## Quick answers about Sift Biosciences

### Who invested in Sift Biosciences?

Sift Biosciences's investors include Isai and Vision Ventures.

### How much has Sift Biosciences raised?

Sift Biosciences has raised $3.8M across 1 round since 2025.

### When did Sift Biosciences last raise?

Sift Biosciences's most recent round was a Pre-seed of $3.8M in Dec 2025.

### What was Sift Biosciences's biggest round?

Its most recent round, $3.8M in Dec 2025, is also its largest on record.

### Who backed Sift Biosciences first?

Sift Biosciences's first round on record, in Dec 2025, was backed by Isai and Vision Ventures.

### What stage is Sift Biosciences at?

Sift Biosciences's latest named round is a Pre-seed, in Dec 2025.

### Where is Sift Biosciences based?

Sift Biosciences is based in the United States.

## Companies like Sift Biosciences

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

[**Matchpoint Therapeutics** $220M · Oct 2026](https://millionrounds.com/company/matchpoint-therapeutics)[**Rx Bandz** Oct 2026](https://millionrounds.com/company/rx-bandz)[**Hera Biotech** $1.8M · Sept 2026](https://millionrounds.com/company/hera-biotech)[**GevRx Nutraceuticals** $300K · Sept 2026](https://millionrounds.com/company/gevrx-nutraceuticals)[**RegCell** $81M · Sept 2026](https://millionrounds.com/company/regcell)[**ClearSight Therapeutics** $307K · Sept 2026](https://millionrounds.com/company/clearsight-therapeutics)

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