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ACT Venture Capital

Venture capital

Dublin · Seed–Growth · 10 people tracked

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Investment thesis

ACT Venture Capital is an independent Irish venture capital firm that invests €1 million to €15 million in growth-stage private companies, with capacity for larger commitments through syndicated rounds.

Source: firm website, verified Aug 7, 2026.

Stage
Seed–Growth
Check
$1.1M – $16.2M
HQ
Dublin, IE
Instruments
Equity
Founded
1994
AUM
$648M
Tracked investments
99

Team · 10 people

from the firm's website
John O'Sullivan· General Partner
Andrew O'Neill· Principal
Conor Mills· Principalin
Cathy McBride· Fund Accountant
Lorraine Paton· Financial Controllerin
Mairead Roche· Associatein
Sarah Matthews· Accountsin
Shanice Callinan· Office Manager

What they invest in

from 4 of 99 portfolio companies

AI & Machine Learning ×3Enterprise Software ×2Fintech ×2SaaS ×2B2B Marketplaces ×1Cybersecurity ×1Data & Infrastructure ×1Deep Tech ×1

HQs:Ireland×3

Investments · 99 tracked

founders shown can be your intro path
Akara
Akara
Akara Liveactventure.capitalin𝕏
Alpha Wireless
Alpha Wireless
AQMetricsaqmetrics.com

AQMetrics provides investment compliance software that automates ongoing monitoring of ownership structures, investment limits, and portfolio risk for financial institutions.

Data & InfrastructureEnterprise SoftwareFintechLegalTechSaaSDublin, IE

Cesanta
Cesanta
ChannelSight
ChannelSight
CitySwift
CitySwift
Corvil
Corvil
CR2
CR2
Cubic3
Cubic3
Decawave
Decawave
Deciphexdeciphex.comin𝕏
Eblana Photonics
Eblana Photonics
EdgeTier
EdgeTier
Ekco
Ekco
ESGwebsite-files.com
Everyangle
Everyangle
Fresco
Fresco
Gocontractor
Greyscout
Greyscout
GridBeyondgridbeyond.comin𝕏
Hubli
Hubli
ID Pal
ID Pal
iheed
iheed
Keelvarkeelvar.comin

Keelvar is an AI-native advanced sourcing optimization platform that helps enterprises automate and optimize procurement processes by matching buyers and suppliers fairly using intelligent algorithms.

AI & Machine LearningB2B MarketplacesEnterprise SoftwareSaaSCork, IE

Alan Holland(Founder & CEO)in

Keelvar
Lative
Lative
Lime Microsystems
Lime Microsystems
mAdme
mAdme
Mavarick
Mavarick
Micron Agritech
Micron Agritech
Oblivious
Ocrex
Ocrex
OralEye
OralEye
Plasmabound

Frequently asked questions

What stage does ACT Venture Capital invest at?
ACT Venture Capital invests at the Seed, Series A, Series B, Series C, Growth stages.
What is ACT Venture Capital's typical check size?
ACT Venture Capital typically writes checks of $1.1M – $16.2M.
What sectors does ACT Venture Capital focus on?
ACT Venture Capital focuses on AI & Machine Learning, Biotech, Climate Tech, Cloud Computing, Consumer, Cybersecurity, Data & Infrastructure, Deep Tech, Defense Tech, E-commerce, Energy, Enterprise Software, Fintech, Hardware, Healthtech, IoT, Media & Entertainment, Medical Devices, SaaS, Semiconductors, Space Tech.
Where is ACT Venture Capital located?
ACT Venture Capital is headquartered in Dublin, IE.

Media · Podcasts & interviews

featuring the team

John O'Sullivan, ACT Venture Capital - Capital Ideas, season 2, episode 3

KPMG Ireland · John O'Sullivan

KPMG Capital Ideas Podcast - John O'Sullivan ACT Venture Capital

KPMG Ireland · John O'Sullivan

Images

ACT Venture Capital photoACT Venture Capital photoACT Venture Capital photoACT Venture Capital photoACT Venture Capital photoACT Venture Capital photo

Co-investors · 10

Molten Ventures

Molten Ventures is a European venture capital firm that backs technology founders from Series A onward, providing capital along with operational expertise, networks, and partnership to help companies scale globally.

Both backed · 1
Deciphex
$2.5M – $63.5M
Seroba Life Sciences

Seroba is a Dublin-based life sciences venture capital firm investing in early-stage biotech and medtech companies developing new therapeutics and medical devices.

Both backed · 1
Deciphex
$540K – $7.6M
Accel

Accel is a venture capital firm that partners with exceptional founding teams, positioning itself as a first partner to startups globally.

$1.6M – $70M
Greylock Partners

Greylock Partners is a venture capital firm that backs founders at the earliest stages, often as their first investor before a product exists.

$100K – $200M
Wildcat Venture Partners

Wildcat Venture Partners is a venture capital firm that backs technology entrepreneurs aiming to create new market categories.

$500K – $6M
Rally Ventures Management, Llc

Rally Ventures is an early-stage venture capital firm focused exclusively on B2B/business technology companies, backing high-potential startups across sectors such as AI/ML, cybersecurity, fintech and SaaS.

$100K – $4M
WestWave Capital

WestWave Capital is an early-stage venture capital firm founded by former entrepreneurs and experienced investors, focused on backing founders building and scaling technology companies.

Atlantic Bridge Ventures

Atlantic Bridge is a growth equity firm investing in deep technology companies across Europe, the UK and the US, using a cross-border value-add strategy and a global platform to help portfolio companies scale internationally.

$1M – $5M
Verve Ventures

Verve Ventures (Verve Capital Partners AG) is a Swiss deep tech venture capital firm investing at the intersection of science and enterprise, focused exclusively on Europe. It is a FINMA-licensed securities firm based in Zurich.

$1.1M – $2.2M
Sure Valley Ventures

Sure Valley Ventures is a venture capital firm investing in early-stage artificial intelligence software companies operating in the UK and Ireland.

Firms observed investing alongside ACT Venture Capital, from public investor directories. Shared companies are the overlap with ACT Venture Capital's recorded portfolio.

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