# Diameter Health funding: rounds and investors > Diameter Health has raised $9.8M across 2 rounds since 2015. Investors include Optum Ventures, Connecticut Innovations and LRVHealth. Source: https://millionrounds.com/company/diameter-health (Millionrounds; every figure on the page links to its filing or article) United States · [Series A startup](https://millionrounds.com/companies) # 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. Biotech Healthcare Funding summary Updated 26 Oct 2026 **$9.8M** raised across 2 rounds since 2015, from 2 sources **$227K** Debt **$9.6M** Series A - **Latest round:** Series A, $9.6M Apr 2019 - **Led by:** Optum Ventures - **Step-up i:** 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. 2016 2017 2018 2019 **$227K** Debt **$9.6M** Series A - **First round:** Debt, $227K - **Biggest round:** $9.6M - **Between rounds:** 3.9 years ## The rounds - **Apr 2019** Series A **$9.6M** *5 new* [Optum Ventures](https://millionrounds.com/fund/optum-ventures) Lead [Connecticut Innovations](https://millionrounds.com/fund/connecticut-innovations) [LRVHealth](https://millionrounds.com/fund/lrvhealth) [Activate](https://millionrounds.com/fund/activate) [Excelerate](https://millionrounds.com/fund/excelerate) Reported by FinSMEs SEC filing: $9.6M sold, first sale Jan 2019 - **May 2015** Debt **$227K** No investor was named in the report. From a historical funding record SEC 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. **Debt** 2015 **Series A** 2019 [Optum Ventures](https://millionrounds.com/fund/optum-ventures) L [Connecticut Innovations](https://millionrounds.com/fund/connecticut-innovations) [LRVHealth](https://millionrounds.com/fund/lrvhealth) [Activate](https://millionrounds.com/fund/activate) [Excelerate](https://millionrounds.com/fund/excelerate) ## Everyone who backed them [Optum Ventures](https://millionrounds.com/fund/optum-ventures) VC firm **1** round, led 1 [Connecticut Innovations](https://millionrounds.com/fund/connecticut-innovations) Government **1** round [LRVHealth](https://millionrounds.com/fund/lrvhealth) VC firm **1** round [Activate](https://millionrounds.com/fund/activate) Accelerator **1** round [Excelerate](https://millionrounds.com/fund/excelerate) Investment firm **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=diameter-health). ## 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. [HLM Investment Partners](https://millionrounds.com/fund/hlm-investment-partners) VC firm Per its own site ## Quick answers about Diameter Health ### Who invested in Diameter Health? Diameter Health's investors include Optum Ventures, Connecticut Innovations, LRVHealth, Activate and Excelerate. Optum Ventures led its latest round. ### How much has Diameter Health raised? Diameter Health has raised $9.8M across 2 rounds since 2015. ### When did Diameter Health last raise? Diameter Health's most recent round was a Series A of $9.6M in Apr 2019, led by Optum Ventures. ### What was Diameter Health's biggest round? Its most recent round, $9.6M in Apr 2019, is also its largest on record. ### Who backed Diameter Health first? Diameter Health's first round on record, in Apr 2019, was backed by Optum Ventures, Connecticut Innovations and LRVHealth and 2 others. ### What stage is Diameter Health at? Diameter Health's latest named round is a Series A, in Apr 2019. ### Where is Diameter Health based? Diameter Health is based in the United States. ### Who led Diameter Health's rounds? Optum Ventures led the Series A in 2019. ## Companies like Diameter Health In the same sector, and raised in the last eighteen months. [**Star Therapeutics** $325M · Oct 2026](https://millionrounds.com/company/star-therapeutics)[**Promaxo** $106M · Oct 2026](https://millionrounds.com/company/promaxo)[**Prolific Machines** $105M · Oct 2026](https://millionrounds.com/company/prolific-machines)[**AI** $18M · Oct 2026](https://millionrounds.com/company/ai)[**Baba** $40M · Oct 2026](https://millionrounds.com/company/baba)[**IMIO** $19M · Oct 2026](https://millionrounds.com/company/imio) ## Find investors like these Search every investor by what they have actually funded, then narrow to your stage and market. Free. Open the investor searchOr these rounds in the app