Patrick O'Shaughnessy

Active Investor

Founder and CEO at Positive Sum

Greenwich, Connecticut

Patrick O'Shaughnessy, Founder and CEO at Positive Sum is an active investor based in Greenwich, Connecticut. This profile covers what Patrick O'Shaughnessy backs, at which stage, and how founders can reach out in 2026.

Investor type: AngelVCPEInvestment Partner
Stages: Early Stage Venture
Invests in: Healthcare & BiotechSaaS & EnterpriseIoT & Connected Devices
Location: Greenwich, Connecticut
Typical check: $500K
Past investments: 4

Notable investments

Eight SleepBottomlessPrefectHumanCo

How to reach Patrick O'Shaughnessy

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Frequently Asked Questions

What does Patrick O'Shaughnessy invest in?

Patrick O'Shaughnessy invests in Healthcare & Biotech, SaaS & Enterprise and IoT & Connected Devices, typically at Early Stage Venture. Match your sector and stage, then reach out with a personalized pitch.

How do I contact Patrick O'Shaughnessy?

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