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ACT Venture Capital

Venture capital

Dublin · Seed–Growth · 12 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
54

Team · 12 people

from the firm's website & curated
John O'Sullivan· General Partner
Andrew O'Neill· Principal

What they invest in

from 28 of 54 portfolio companies

AI & Machine Learning ×13Enterprise Software ×8SaaS ×8Deep Tech ×6Hardware ×6Data & Infrastructure ×4Healthtech ×4Cybersecurity ×3

HQs:Ireland×12

Investments · 54 tracked

founders shown can be your intro path
Akara

Co-investorsAct Venture Capital

Akara Liveactventure.capitalin𝕏
Alpha Wirelessalphawireless.comin

Alpha Wireless designs and manufactures antenna solutions and turnkey streetworks hardware for telecom operators, neutral host providers, and utilities deploying 5G, fixed wireless access (FWA), and private networks.

Enterprise SoftwareHardwareIoTPortlaoise, IE

Co-investorsAct Venture Capital

AQMetricsaqmetrics.comin𝕏

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

Data & InfrastructureEnterprise SoftwareFintechLegalTechSaaSDublin, IE

Geraldine Dautun(Founder)in

Co-investorsAct Venture CapitalFrontline Ventures

Cesantacesanta.comin𝕏

Cesanta develops embedded networking and connectivity software, including an embedded web server and IoT framework, for developers connecting applications and devices online.

Developer ToolsHardwareIoT

Anatoly (Toly) LebedevSergey Lyubka

Co-investors500 GlobalAct Venture Capital

ChannelSightchannelsight.comin

ChannelSight offers a commerce intelligence platform that connects brands' product pages and marketing campaigns to the retailers carrying their products, with Where To Buy, Add to Cart, digital shelf monitoring and shoppable media tools.

E-commerceMarketing TechRetail Tech

Co-investorsAct Venture CapitalLiquidity CapitalNauta Capital

CitySwiftcityswift.comin𝕏

CitySwift provides a data analytics platform for bus network operators and transit authorities, cleaning and enriching raw bus data to deliver insights, recommendations, and demand forecasting.

AI & Machine LearningData & InfrastructureMobility & Transportation

Co-investorsAct Venture CapitalGresham House VenturesWestern Development Commission

CR2

Co-investorsAct Venture Capital

Cubic3

Co-investorsAct Venture Capital

Decawavedecawave.com

Decawave developed Ultra-Wideband (UWB) technology, including UWB integrated circuits, modules, and evaluation kits, some compatible with Apple's U1 chip.

HardwareIoTSemiconductors

Co-investorsAct Venture CapitalKernel CapitalWestSummit Capital

Deciphexdeciphex.comin𝕏

Deciphex develops AI-based digital pathology platforms for clinical diagnostics and drug development, including Diagnexia for NHS clinical pathology and Patholytix for GLP-compliant preclinical pharma studies.

AI & Machine LearningDigital HealthHealthtech

Co-investorsAct Venture CapitalClaret Capital PartnersMolten VenturesSeroba Life Sciences

Eblana Photonicseblanaphotonics.com

Eblana Photonics designs and manufactures laser diodes, including single frequency DFB laser diodes, Quantum Cascade DFB lasers, VCSELs, and superluminescent diodes, for use in optical sensing, LIDAR, and telecoms applications.

Deep TechHardwareSemiconductorsDublin, IE

Co-investorsAct Venture Capital

EdgeTieredgetier.comin

EdgeTier provides AI-powered software that analyzes customer interactions in real time to identify issues and their root causes for contact centers and customer experience teams.

AI & Machine LearningEnterprise SoftwareSaaSDublin, IE

Shane(Chief Executive Officer / Co-Founder)inCiarán(Chief Technical Officer / Co-Founder)in

Co-investorsAct Venture CapitalEpisode1

Ekcoek.coin𝕏

Ekco is a security-first managed service provider offering managed IT and cloud services, cyber security, business continuity, and IT support to businesses and IT departments.

Cloud ComputingCybersecurityEnterprise Software

Co-investorsAct Venture Capital

Everyangle
Fresco
Gocontractor

Co-investorsAct Venture CapitalBuilding Ventures

Greyscoutgreyscout.comin𝕏

GreyScout offers brand protection software that detects, verifies, and enforces against unauthorized and grey-market sellers across global online marketplaces such as Amazon, eBay, and Walmart.

Co-investorsAct Venture CapitalFurthr VC

Gridbeyondgridbeyond.comin𝕏

GridBeyond operates a technology platform that manages distributed and flexible energy resources, using AI to dispatch flexibility from assets such as utility-scale renewables, battery storage and industrial load into energy markets.

AI & Machine LearningCleantechEnergy

Co-investorsAct Venture CapitalClaret Capital PartnersConstellation Technology VenturesEnergy Impact PartnersFurthr VCMirova+1 more

Hubli
ID Pal

Co-investorsAct Venture Capital

iheed

Co-investorsAct Venture Capital

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

Co-investors83NorthAct Venture CapitalEnterprise EquityMosaic VenturesSquareOne

Lativelative.ioin𝕏

Lative is an AI-native platform for go-to-market (GTM) planning and decision intelligence that unifies sales strategy with execution by connecting marketing intelligence to sales operations.

AI & Machine LearningSaaS

Co-investorsAct Venture CapitalSenovo

Lime Microsystemslimemicro.comin𝕏

Lime Microsystems develops field-programmable RF (software-defined radio) hardware and network solutions for wireless systems, supporting 4G and 5G deployments.

Deep TechHardwareSemiconductors

Co-investorsAct Venture Capital

Mad Memad-me.comin

Mad-Me provides on-device AI that gathers real-time mobile signals (app opens, unlock events, location, connectivity, roaming) to help telecom service providers trigger contextual, well-timed messages to subscribers.

AdTechAI & Machine LearningMarketing Tech

Co-investorsAct Venture CapitalDelta Partners

Mavarick

Co-investorsAct Venture Capital

Micron Agritechmicronagritech.comin𝕏

Micron Agritech makes the Micron Kit, an AI-powered platform for fast, lab-quality fecal egg count (FEC) testing to detect gastrointestinal worms and liver and rumen fluke in cattle, sheep, and horses.

AgTechAI & Machine LearningHealthtech

Co-investorsAct Venture CapitalThe Yield Lab EuropeThe Yield Lab

Oblivious Acquiredoblivious.comin𝕏

Oblivious builds privacy-enhancing software that enables organizations to perform secure data collaboration and deploy services while maintaining data sensitivity.

CybersecurityData & InfrastructureEnterprise SoftwareDublin, IE

Jack Fitzsimons(Co-founder)Robert Pisarczyk(Co-founder)

Co-investorsAct Venture CapitalAcurio VenturesExpeditionsFirestreak VenturesNAP

Ocrex

Co-investorsAct Venture Capital

OralEye

Co-investorsAct Venture Capital

Plasma Boundplasmabound.comin𝕏

Plasma Bound, a spin-out of University College Dublin, develops Controlled Polymer Ablation (CPA) surface-engineering technology for bonding lightweight structural assemblies.

Advanced ManufacturingDeep TechNew MaterialsDublin, IE

Alan Barry(CEO & Co-Founder)Xavier Montibert(Commercial Director & Co-Founder)Dr. Nick Barry(CTO & Co-Founder)

Co-investorsAct Venture CapitalBusiness Venture Partners

Playter
Provizioprovizio.ai

Provizio develops software-defined imaging radar and AI perception software that converts raw radar data into insight for safety, efficiency, and automation.

AI & Machine LearningDeep TechMobility & Transportation

Co-investorsAct Venture CapitalTechFounders

RecommenderX
S3 Connected Healths3connectedhealth.comin

S3 Connected Health provides services to develop, launch, and operate digital health solutions, helping clients meet regulatory requirements for medical products and devices.

Digital HealthHealthtechMedical Devices

Co-investorsAct Venture Capital

Scurri

Co-investorsAct Venture Capital

ServisBOTservisbot.comin𝕏

ServisBot provides agentic AI agents, assistants, and copilots with human-in-the-loop oversight, auditability, and compliance guardrails for enterprises in regulated industries.

AI & Machine LearningEnterprise SoftwareSaaS

Co-investorsAct Venture Capital

SilverCloud
SiriusXTsiriusxt.comin𝕏

SiriusXT builds the SXT-100, a laboratory-scale soft X-ray microscope that produces label-free 3D subcellular tomograms of whole cells and tissue for disease and drug research.

BiotechDeep TechHardwareDublin, IE

Co-investorsAct Venture CapitalDelta Partners

Spectrum Life
Spotted Zebra
Tandem HR

Co-investorsAct Venture Capital

Trustaptrustap.comin𝕏

Trustap provides an all-in-one payments platform for online marketplaces, ecommerce stores, motors platforms, and peer-to-peer transactions, combining payment processing, fraud prevention, chargeback management, and dispute resolution in a single integration.

E-commerceFintechMarketplaces

Co-investorsAct Venture CapitalFurthr VCPartners ResoluteTX Ventures

Ubotica

Builds the autonomous intelligence layer for satellites, with its CogniSat platform fusing multimodal sensor data (optical, radar, hyperspectral, transponder signals) and running AI inference on-board in orbit, orchestrated across a virtual constellation of third-party satellites.

Co-investorsAct Venture Capital

Umba
UrbanFoxurbanfox.ioin𝕏

UrbanFox is an AI-powered fraud detection platform that uses generative AI and behavioral intelligence to detect online payment fraud, bot traffic, and account takeover attempts without relying on static rules.

AI & Machine LearningCybersecurityFintechDublin, IE

Co-investorsAct Venture CapitalFurthr VCJetBlue VenturesSKY VCTechstarsIAG Capital Partners

Verodatverodat.comin𝕏

Verodat provides a governed data supply chain platform that validates, tracks provenance, and structures business data so it can be reliably used by AI, analytics, and automation tools.

AI & Machine LearningData & InfrastructureEnterprise SoftwareDublin, IE

Thomas Russell(Founder)

Co-investorsAct Venture Capital

VideoElephantvideoelephant.comin

VideoElephant operates a large premium video library of over 5 million rights-cleared videos, playlists, and channels, offering content licensing, distribution, syndication, monetization, and advertising solutions.

AdTechMedia & EntertainmentSaaS

Co-investorsAct Venture CapitalFurthr VC

Visuavisua.comin𝕏

VISUA develops a Visual-AI computer vision technology suite offered via API, covering capabilities such as image scanning for brand and trademark infringement and sports sponsorship monitoring.

AI & Machine LearningDeep TechSaaSDublin, IE

Co-investorsAct Venture Capital

Vitro Softwarevitrosoftware.comin𝕏

Vitro is a clinician-designed digital medical record system that digitises hospitals' existing paper forms, pathways and workflows, capturing clinical data at the bedside and integrating scanned historical records with lab, radiology and patient administration results.

Digital HealthHealthtechSaaS

Co-investorsAct Venture Capital

Worldnet Payments

Co-investorsAct Venture Capital

Portfolio news

latest coverage across their companies

Frequently asked questions

How many investments has ACT Venture Capital made?
ACT Venture Capital has 54 tracked investments.
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.
Who does ACT Venture Capital co-invest with?
ACT Venture Capital most often shares deals with Act Venture Capital, Furthr VC, Claret Capital Partners, among 36 tracked co-investors.

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

Rally Ventures Management, Llc

Rally Ventures is an investment firm focused on business technology companies, backing a select group of high-potential startups to help them grow market impact and value.

Both backed · 1
Corvil
$100K – $4M
Molten Ventures

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

Both backed · 1
$2.5M – $63M
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
$540K – $7.6M
Accel

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

$1.6M – $70M
Greylock Partners

Greylock Partners is an early-stage venture capital firm that partners with founders building companies from inception. Its partners make only one or two new investments per year to focus deeply on each partnership.

$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
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 operates a digital platform where qualified individuals and institutions can either commit to funds or cherry-pick single deals, blending a venture fund with a curated angel investing platform rather than using a traditional closed GP-LP structure. The fund focuses on deep tech investments in climate/energy, industrial tech, health & bio, and future computing, systematically tracking research teams in academia before they spin out into companies and conducting rigorous multi-month to multi-year diligence processes.

$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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