Sean O'Brien is a Co-founder and Managing Partner at Overline. He has experience in investment banking, hedge fund management, and corporate strategy.
What Sean can write
Overline writes $250K to $3M checks, larger than 33% of firms in the atlas.
Bars: how many firms report each check band. Highlighted: Overline.Career
- PGi · President and Chief Strategy Officer
- Overline · Co-founder & Managing PartnerNow
Companies founded
Also at Overline
Partners like Sean
At firms with a similar stage, sector and check size.
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One email when Sean's firm raises a fund, adds a partner or shows new activity.
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Raising a pre-seed or seed round? We write $1M to $5M first checks and help founders with distribution. A partner reads every deck.
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Who is Sean O'Brien?
Sean O'Brien is a Co-founder and Managing Partner at Overline. He has experience in investment banking, hedge fund management, and corporate strategy.
How much does Sean O'Brien invest?
Sean O'Brien invests through Overline, which writes checks of $250K to $3M at pre-seed, seed.
How do I pitch Sean O'Brien?
Email [email protected], the firm's inbox for founders, and name Sean in the subject. A warm intro from a founder Overline backed works better.
What did Sean O'Brien do before Overline?
President and Chief Strategy Officer at PGi.
Last updated 2026-10-15. Is this you? Ask for a correction.