Patrick O’Shaughnessy is the Founder and CEO of Positive Sum. He manages a portfolio of various technology companies.
What Patrick can write
Positive Sum writes $100K to $30M checks, larger than 5% of firms in the atlas.
Bars: how many firms report each check band. Highlighted: Positive Sum.Companies founded
Investments named in public bios
Also at Positive Sum
Partners like Patrick
At firms with a similar stage, sector and check size.
Alert me when Positive Sum is active
One email when Patrick's firm raises a fund, adds a partner or shows new activity.
Send Mode VC your deck
Raising a pre-seed or seed round? We write $1M to $5M first checks and help founders with distribution. A partner reads every deck.
Send your deckQuestions
Who is Patrick O’Shaughnessy?
Patrick O’Shaughnessy is the Founder and CEO of Positive Sum. He manages a portfolio of various technology companies.
How much does Patrick O’Shaughnessy invest?
Patrick O’Shaughnessy invests through Positive Sum, which writes checks of $100K to $30M at pre-seed, seed, series a, series b.
How do I pitch Patrick O’Shaughnessy?
Email [email protected], the firm's inbox for founders, and name Patrick in the subject. A warm intro from a founder Positive Sum backed works better.
Last updated 2026-10-15. Is this you? Ask for a correction.