Who invested in Diameter Health

2 rounds we have observed, with the 5 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.

BiotechHealthcare

Funding summaryUpdated 26 Oct 2026

$9.8Mraised across 2 rounds since 2015, from 2 sources

$227KDebt$9.6MSeries A

Latest round: Series A, $9.6MApr 2019
Led by: Optum Ventures
Step-upi: 42.3×
Investors: 5 (1 led)

See who backed them

The funding story

Each circle is a round, placed by date and sized by amount. The line above is the running total.

2016201720182019

$227KDebt$9.6MSeries A

First round: Debt, $227K
Biggest round: $9.6M
Between rounds: 3.9 years

The rounds

Apr 2019
Series A$9.6M5 new
Reported by FinSMEsSEC filing: $9.6M sold, first sale Jan 2019
May 2015
Debt$227K
No investor was named in the report.
From a historical funding recordSEC filing: $227K sold, first sale Apr 2015

Who was in which round

The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.

Debt2015Series A2019

Optum VenturesL

Connecticut Innovations

LRVHealth

Activate

Excelerate

Everyone who backed them

Optum VenturesVC firm1round, led 1

Connecticut InnovationsGovernment1round

LRVHealthVC firm1round

ActivateAccelerator1round

ExcelerateInvestment firm1round

Missing a round, or an investor who was in one? Tell us.

Also claim to have backed them

This firm lists Diameter Health 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.