# Investors from the United States in Ireland (2026 list)

> 69 investors from the United States in Ireland, 97% active in the last 12 months. Led by Y Combinator, SOSV, MedTech Innovator. Ranked by what they funded.

Source: https://millionrounds.com/lists/investors-from-united-states-in-ireland (Millionrounds; every figure on the page links to its filing or article)

[Investor Lists](https://millionrounds.com/lists)

# Investors from the United States in Ireland

Updated 7 November 2026

Firms based in the United States that we have watched in a round raised by a company in Ireland in the last two years. The investors who already make this crossing, ranked by how many of those rounds they joined.

[See all 69 *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Finvestors-from-united-states-in-ireland)The top 25

**69** investors on the list *+1* this week

**3,544** cheques in 12 months *-19%* against the market

**$15M** median round they joined *+88%* against the market median

**97%** wrote a cheque in 12 months

**70%** have led a round

## The Top 25

Ordered by rounds in Ireland, never by anything anyone paid for

Deploying now (25)

- 1 [Y Combinator](https://millionrounds.com/fund/y-combinator) *Deploying now* Accelerator · United States **7 of 6,412** **$3M** median round **Oct 2026** last seen
- 2 [SOSV](https://millionrounds.com/fund/sosv) *Deploying now* VC firm · United States **6 of 951** **$2.5M** median round **Nov 2026** last seen
- 3 [MedTech Innovator](https://millionrounds.com/fund/medtech-innovator) *Deploying now* Accelerator · United States **6 of 160** **$2.8M** median round **Sept 2026** last seen
- 4 [Gaingels](https://millionrounds.com/fund/gaingels) *Deploying now* Private equity · United States **5 of 1,010** **$8M** median round **Oct 2026** last seen
- 5 [RA Capital Management](https://millionrounds.com/fund/ra-capital-management) *Deploying now* Private equity · United States **3 of 395** **$93M** median round **Nov 2026** last seen
- 6 [FJ Labs](https://millionrounds.com/fund/fj-labs) *Deploying now* VC firm · United States **2 of 849** **$11M** median round **Oct 2026** last seen
- 7 [First Round Capital](https://millionrounds.com/fund/first-round-capital) *Deploying now* VC firm · United States **2 of 807** **$18M** median round **Oct 2026** last seen
- 8 [Union Square Ventures](https://millionrounds.com/fund/union-square-ventures) *Deploying now* VC firm · United States **2 of 407** **$17M** median round **Nov 2026** last seen
- 9 [Endeavor Catalyst](https://millionrounds.com/fund/endeavor-catalyst) *Deploying now* Corporate VC · United States **2 of 318** **$30M** median round **Oct 2026** last seen
- 10 [Morgan Stanley Investment Management](https://millionrounds.com/fund/morgan-stanley-investment-management) *Deploying now* Private equity · United States **2 of 288** **$56M** median round **Oct 2026** last seen
- 11 [Unpopular Ventures](https://millionrounds.com/fund/unpopular-ventures) *Deploying now* VC firm · United States **2 of 264** **$3M** median round **Sept 2026** last seen
- 12 [Deerfield](https://millionrounds.com/fund/deerfield) *Deploying now* VC firm · United States **2 of 198** **$50M** median round **Oct 2026** last seen
- 13 [Cormorant Asset Management](https://millionrounds.com/fund/cormorant-asset-management) *Deploying now* Private equity · United States **2 of 176** **$102M** median round **Oct 2026** last seen
- 14 [Foresite Capital](https://millionrounds.com/fund/forsite-capital) *Deploying now* Private equity · United States **2 of 121** **$90M** median round **Sept 2026** last seen
- 15 [SVG Ventures](https://millionrounds.com/fund/svg-ventures) *Deploying now* Accelerator · United States **2 of 119** **$1.6M** median round **Sept 2026** last seen
- 16 [S2G Investments](https://millionrounds.com/fund/s2g-investments) *Deploying now* Growth equity · United States **2 of 102** **$16M** median round **Oct 2026** last seen
- 17 [RTW Investments LLC](https://millionrounds.com/fund/rtw-investments-lp) *Deploying now* Growth equity · United States **2 of 88** **$123M** median round **Nov 2026** last seen
- 18 [IAG Capital Partners](https://millionrounds.com/fund/iag-capital-partners) *Deploying now* Private equity · United States **2 of 46** **$15M** median round **Sept 2026** last seen
- 19 [Techstars](https://millionrounds.com/fund/techstars) *Deploying now* VC firm · United States **1 of 2,989** **$1.2M** median round **Nov 2026** last seen
- 20 [New Enterprise Associates](https://millionrounds.com/fund/new-enterprise-associates) *Deploying now* VC firm · United States **1 of 1,610** **$34M** median round **Oct 2026** last seen
- 21 [Plug and Play](https://millionrounds.com/fund/plug-and-play) *Deploying now* Accelerator · United States **1 of 1,561** **$5M** median round **Nov 2026** last seen
- 22 [Google for Startups](https://millionrounds.com/fund/google-for-startups) *Deploying now* Accelerator · United States **1 of 811** **$1.4M** median round **Sept 2026** last seen
- 23 [Greycroft](https://millionrounds.com/fund/greycroft) *Deploying now* VC firm · United States **1 of 655** **$13M** median round **Nov 2026** last seen
- 24 [Salesforce Ventures](https://millionrounds.com/fund/salesforce-ventures) *Deploying now* Corporate VC · United States **1 of 649** **$26M** median round **Nov 2026** last seen
- 25 [Felicis](https://millionrounds.com/fund/felicis-ventures) *Deploying now* VC firm · United States **1 of 640** **$20M** median round **Nov 2026** last seen

**44 more on this list**

All 69 are in the app, with filters for stage, sector and market. A free account shows 10 per search, Pro up to 1,000.

[See the whole list *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Finvestors-from-united-states-in-ireland)

## The Newest Cheques

Rounds this list's investors joined most recently

- **6** Nov **[Ocient](https://millionrounds.com/company/ocient)** Series C · $100M *With* [Greycroft](https://millionrounds.com/fund/greycroft)
- **6** Nov **[Harbinger](https://millionrounds.com/company/harbinger)** Series D+ · $240M *With* [Greycroft](https://millionrounds.com/fund/greycroft)
- **5** Nov **[ArrayPatch](https://millionrounds.com/company/arraypatch)** Seed · $1.8M *Led by* [Lakeside Capital](https://millionrounds.com/fund/lakeside-capital)
- **5** Nov **[Alethio Therapeutics](https://millionrounds.com/company/alethio-therapeutics)** Series A · $90M *Led by* [RA Capital Management](https://millionrounds.com/fund/ra-capital-management)
- **5** Nov **[Anaheim Bio](https://millionrounds.com/company/anaheim-bio)** Series A · $45M *With* [RTW Investments LLC](https://millionrounds.com/fund/rtw-investments-lp)
- **5** Nov **[RadianX](https://millionrounds.com/company/radianx)** Seed · $9M *Led by* [SOSV](https://millionrounds.com/fund/sosv)

## Stages This Year

2,903 rounds

- Venture **23%**
- Series A **16%**
- Seed **16%**
- Pre-seed **11%**
- Series B **8%**
- Other **27%**

## What They Backed

Sectors, last 12 months

- AI **1,190**
- Biotech **257**
- Fintech **207**
- Healthcare **172**
- Big Data & Analytics **155**
- Financial Services **121**

## Cheques by Quarter

Led Joined

1,158 Q1 25

1,130 Q2 25

1,200 Q3 25

1,261 Q4 25

1,140 Q1 26

1,005 Q2 26

749 Q3 26

169 Q4 26

The last bar is the quarter still running.

## Lists Like This

- [Investors from the United States in the United Kingdom 618](https://millionrounds.com/lists/investors-from-united-states-in-united-kingdom)
- [Investors from the United States in Canada 400](https://millionrounds.com/lists/investors-from-united-states-in-canada)
- [Investors from the United States in Germany 228](https://millionrounds.com/lists/investors-from-united-states-in-germany)
- [Investors from the United States in Australia 213](https://millionrounds.com/lists/investors-from-united-states-in-australia)
- [Investors from the United Kingdom in the United States 211](https://millionrounds.com/lists/investors-from-united-kingdom-in-united-states)
- [Investors from the United States in Brazil 206](https://millionrounds.com/lists/investors-from-united-states-in-brazil)
- [Investors from the United States in France 201](https://millionrounds.com/lists/investors-from-united-states-in-france)
- [Investors from the United States in Switzerland 186](https://millionrounds.com/lists/investors-from-united-states-in-switzerland)
- [Investors from the United States in Singapore 164](https://millionrounds.com/lists/investors-from-united-states-in-singapore)

[All investor lists *→*](https://millionrounds.com/lists)

## Quick answers about investors from the United States in Ireland

### Who are the most active investors from the United States in Ireland?

By rounds in Ireland, the most active are Y Combinator, SOSV, MedTech Innovator, Gaingels and RA Capital Management.

### How many investors from the United States in Ireland are there?

69 are on record. 97% made an investment in the last 12 months and 70% have led a round.

### Which stages do investors from the United States in Ireland back?

Of the rounds with a named stage in the last 12 months, mostly Series A (23%) and Seed (23%).

### How big are the rounds investors from the United States in Ireland join?

The typical (median) round among the leading investors here is $16M.

### Which sectors do investors from the United States in Ireland back most?

In the last 12 months, mostly AI, Biotech and Fintech.

### Which investors from the United States in Ireland lead the most rounds?

New Enterprise Associates (73 led), Union Square Ventures (17 led) and Felicis (17 led).

### Where are investors from the United States in Ireland based?

Most of the leading investors here are based in the United States (25 of the top 25).

### What have investors from the United States in Ireland invested in recently?

Recent rounds include Ocient (Series C, Nov 2026, with Greycroft), Harbinger (Series D+, Nov 2026, with Greycroft) and ArrayPatch (Seed, Nov 2026, with Lakeside Capital).

Built from the rounds we watched, refreshed every night. [How we count](https://millionrounds.com/methodology) · [Report a correction](https://millionrounds.com/corrections)