# Mainstay Medical Holdings plc funding: rounds and investors

> Mainstay Medical Holdings plc has raised $108M across 1 round since 2021. Investors include Ally Bridge Group, Sofinnova Partners, through its Crossover...

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

Ireland · [Growth startup](https://millionrounds.com/companies)

# Who invested in *Mainstay Medical Holdings plc*

One round we have observed, with the 5 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.

Healthcare Medical Devices

Funding summary Updated 26 Oct 2026

**$108M** raised across 1 round since 2021, from 1 source

- **Latest round:** Growth, $108M Feb 2021
- **Led by:** Ally Bridge Group and Sofinnova Partners, through its Crossover Fund
- **Investors:** 5 (2 led)

See who backed them

## The rounds

- **Feb 2021** Growth **$108M** [Ally Bridge Group](https://millionrounds.com/fund/ally-bridge-group) Lead [Sofinnova Partners, through its Crossover Fund](https://millionrounds.com/fund/sofinnova-partners-through-its-crossover-fund) Lead [Sofinnova Partners](https://millionrounds.com/fund/sofinnova-partners) [Fountain Healthcare Partners](https://millionrounds.com/fund/fountain-healthcare-partners) [KCK Group - Financial Services Investments](https://millionrounds.com/fund/kck-group-financial-services-investments) Reported by Capricorn Partners SEC filing: $108M sold, first sale Feb 2021

## Everyone who backed them

[Ally Bridge Group](https://millionrounds.com/fund/ally-bridge-group) Private equity **1** round, led 1

[Sofinnova Partners, through its Crossover Fund](https://millionrounds.com/fund/sofinnova-partners-through-its-crossover-fund) Growth equity **1** round, led 1

[Sofinnova Partners](https://millionrounds.com/fund/sofinnova-partners) VC firm **1** round

[Fountain Healthcare Partners](https://millionrounds.com/fund/fountain-healthcare-partners) VC firm **1** round

[KCK Group - Financial Services Investments](https://millionrounds.com/fund/kck-group-financial-services-investments) Private equity **1** round

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

## Quick answers about Mainstay Medical Holdings plc

### Who invested in Mainstay Medical Holdings plc?

Mainstay Medical Holdings plc's investors include Ally Bridge Group, Sofinnova Partners, through its Crossover Fund, Sofinnova Partners, Fountain Healthcare Partners and KCK Group - Financial Services Investments. Ally Bridge Group led its latest round.

### How much has Mainstay Medical Holdings plc raised?

Mainstay Medical Holdings plc has raised $108M across 1 round since 2021.

### When did Mainstay Medical Holdings plc last raise?

Mainstay Medical Holdings plc's most recent round was a Growth of $108M in Feb 2021, led by Ally Bridge Group.

### What was Mainstay Medical Holdings plc's biggest round?

Its most recent round, $108M in Feb 2021, is also its largest on record.

### Who backed Mainstay Medical Holdings plc first?

Mainstay Medical Holdings plc's first round on record, in Feb 2021, was backed by Ally Bridge Group, Sofinnova Partners, through its Crossover Fund and Sofinnova Partners and 2 others.

### What stage is Mainstay Medical Holdings plc at?

Mainstay Medical Holdings plc's latest named round is a Growth, in Feb 2021.

### Where is Mainstay Medical Holdings plc based?

Mainstay Medical Holdings plc is based in Ireland.

### Who led Mainstay Medical Holdings plc's rounds?

Ally Bridge Group led the Growth in 2021.

## Companies like Mainstay Medical Holdings plc

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

[**Neurent Medical** $29M · Sept 2026](https://millionrounds.com/company/neurent-medical)[**Neurobell** $7.6M · Jun 2026](https://millionrounds.com/company/neurobell)[**CroíValve** $41M · Jun 2026](https://millionrounds.com/company/croivalve)[**Aerska** $49M · May 2026](https://millionrounds.com/company/aerska)[**Bluedrop Medical** $13M · Feb 2026](https://millionrounds.com/company/bluedrop-medical)[**Pumpinheart** $832K · Feb 2026](https://millionrounds.com/company/pumpinheart)

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