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Sean O'Brien

Solo GP · Alpharetta, GA

Sean O'Brien is a solo GP based in Alpharetta, GA focused on B2B Software, investing at pre-seed, seed stage. Sean O'Brien's most recent fund with a disclosed size, Overline Seed Fund II, LP, filed a $21M offering with the SEC in Mar 2024. Estimated typical check: $200K–$650K. Sean O'Brien's latest dated investing activity was in Jan 2025.

Why Sean O'Brien is listed

Named as the only individual (executive officer/promoter) on the Form D for Overline Seed Fund II, LP, a $21M venture fund (Mar 2024). Also a non-executive director at 1 startup that filed Form D.

Source: SEC Form D: Overline Seed Fund II, LP (Mar 13, 2024) · 1 more source

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Stages
Pre-seed, Seed
Typical check (est.)
$200K–$650K
Latest fund
$21M · Mar 2024
Latest dated activity
Jan 2025

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What does Sean O'Brien invest in?

B2B Software

What has Sean O'Brien invested in recently?

  • Dink Technologies

    Board seat on the company's SEC filing (not by itself proof of an investment) · GA

    Jan 2025

  • Overline Seed Fund II, LP

    Invested through a fund

    Mar 2024

Funds and deal vehicles Sean O'Brien filed with the SEC

  • Overline Seed Fund II, LP

    Fund · $21M offering

    Mar 2024

Sources

Data refreshed from public sources Oct 15, 2026. Is this you? Remove or correct this profile.