# EcoR1: portfolio, investments and team

> EcoR1 is an investment firm. 1 investment on record, 1 in the last 12 months, latest Oct 2026. Portfolio, stages, co-investors and team.

Source: https://millionrounds.com/fund/ecor1 (Millionrounds; every figure on the page links to its filing or article)

[Investor](https://millionrounds.com/investors)

# EcoR1

Last cheque observed Oct 2026; 1 cheques on record.

Email

Deploying now Investment firm

Series A

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Deploying now

**100%** of best year **1** **cheques in 12 months**, 1 on record

Since the last cheque **1** days **00** hrs **00** min **00** sec

Median round **$90M** Rounds led **0 of 1**

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## EcoR1 highlights

- 01 1 cheques in the last 12 months
- 02 Mostly Series A: 100% of its rounds

## What they do

- **Type:** Investment firm (from a list, unverified)
- **Cheque size:** Not stated
- **Cold pitches:** Not stated

## The record

Every round we can evidence, newest first **1 appearances**

- **2026** 1 round
- **Oct** **[Setara Biosciences](https://millionrounds.com/company/setara-biosciences)** Series A · US · Pulse 2.0 **$90M** With 6 others

An announcement gives the size of the round, not the size of this investor's cheque: the only rounds that imply a cheque are those where they were the sole named investor.

## The cheque

Series A

Median round joined **$90M** the round, not its cheque

Led 0 of 1 rounds **0%**

- **Sole investor:** Never alone
- **Last cheque:** Oct 2026

Rounds by stage said on their site

- Series A *1*

Cheques by month Led Joined

Nov 2023 Oct 2026

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## Quick answers about EcoR1

### What does EcoR1 invest in?

EcoR1 invests most often at Series A (100% of the rounds on record).

### How active is EcoR1?

1 investments on record, 1 of them in the last 12 months. The most recent was in Oct 2026.

### What has EcoR1 invested in recently?

Its most recent investments on record: Setara Biosciences (Series A, Oct 2026).

### How big are EcoR1's cheques?

The median round it joins is $90M.

### Is EcoR1 investing now?

Yes: it is actively investing, with 1 investments in the last 12 months.

### What kind of investor is EcoR1?

EcoR1 is an investment firm.

### Where does this information on EcoR1 come from?

From 1 articles and filings naming it in a round, public registers and its own website, checked and rebuilt every night.

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Built from the rounds we watched, its filings and its own website, refreshed every night. [How we count](https://millionrounds.com/methodology) · [Report a correction](https://millionrounds.com/corrections?slug=ecor1) · [Is this your firm? Claim it](https://millionrounds.com/claim?org=ecor1)