How do I contact John O'Sullivan?

John O'Sullivan, General Partner at Act Venture Capital, can be reached by email. The verified email address is listed on this page.

What is John O'Sullivan's email address?

John O'Sullivan's email address uses the actventure.capital domain (shown as *****@actventure.capital until revealed).

What does John O'Sullivan invest in?

John O'Sullivan backs Fintech and Health tech companies at Series A and Seed, typically writing €92k–€4.6M cheques.

How do I cold email John O'Sullivan?

John O'Sullivan backs Fintech and Health tech companies at Series A and Seed, writing €92k–€4.6M cheques. A concise cold email that leads with relevant traction and one specific ask, sent to the verified address on this page, is the most direct way to reach John.

Where is John O'Sullivan based?

John O'Sullivan is based in Ireland and works at Act Venture Capital.

John O'Sullivan Email & Contact Information

General Partner @ Act Venture Capital

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John O'Sullivan Location

Ireland

John O'Sullivan Investing

General Partner at Act Venture Capital

Stages: Series A, Seed
Sectors: Fintech, Health tech
Cheque size: €92k–€4.6M
Fund size: €487M
Freshness: Verified 1mo ago

John O'Sullivan Summary

John O'Sullivan, based in Ireland, is a General Partner at Act Venture Capital. John O'Sullivan invests in Fintech and Health tech at Series A and Seed, writing €92k–€4.6M cheques. John O'Sullivan's verified email and contact details are available on Mintround.

How to cold email John O'Sullivan

John O'Sullivan, Act Venture Capital in Ireland, backs Fintech and Health tech companies at Series A and Seed, writing €92k–€4.6M cheques. Here's how to get a reply when you cold email John:

Subject line: name your company and one metric that matters to Fintech and Health tech, not “quick chat”.
First line: your strongest traction, the real numbers, not adjectives.
One ask: a 20-minute call with a date range. Keep it under 150 words.
Send it to John's verified address below. No warm intro required.

Show John's email

Notable investments

DeciphexSeries C · $32M · 2025
Good Travel SoftwareSeries Unknown · 2023
PlasmaBoundSeries Unknown · $2M · 2022
Engage-EHSSeries A · $2M · 2019
Worldnet PaymentsSeries A · 2017
SilverCloud HealthSeries A · $8M · 2017
SiriusXTSeed · $3M · 2016
Frontier SiliconSeries Unknown · $31M · 2007

Frequently co-invests with

Eduardo Saverin (Binhai Venture Capital (Tianjin Binhai VC Investment Management Co., Ltd.))Inga DeakinMolten VenturesJennifer McMahonSeroba Life SciencesRaj GangulyB Capital Group

Similar investors

Hal WilsonInvestor, Techstart Ventures

Mike BrennanPartner, Finch Capital

Bradley KeywellInvestor, Lightbank

Josh MittlerAdvisor, Independent

Jake FuchsInvestor, BankTech Ventures, LP

Timothy EadesInvestor, Cyber Mentor Fund

In the press

Act Venture Capital unveils new €140m fund to back tech companies

Frequently asked questions

How do I contact John O'Sullivan?: John O'Sullivan, General Partner at Act Venture Capital, can be reached by email. The verified email address is listed on this page.
What is John O'Sullivan's email address?: John O'Sullivan's email address uses the actventure.capital domain (shown as *****@actventure.capital until revealed).
What does John O'Sullivan invest in?: John O'Sullivan backs Fintech and Health tech companies at Series A and Seed, typically writing €92k–€4.6M cheques.
How do I cold email John O'Sullivan?: John O'Sullivan backs Fintech and Health tech companies at Series A and Seed, writing €92k–€4.6M cheques. A concise cold email that leads with relevant traction and one specific ask, sent to the verified address on this page, is the most direct way to reach John.
Where is John O'Sullivan based?: John O'Sullivan is based in Ireland and works at Act Venture Capital.

Every contact is a verified, deliverable email. How Mintround verifies contacts.

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