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Mark Longenecker

Solo GP · Chicago, IL

Verified active in the last 12 months

Mark Longenecker is a solo GP based in Chicago, IL, investing at pre-seed, seed stage. Mark Longenecker's most recent fund with a disclosed size, Tonic Ventures FUND II, LP, filed a $20M offering with the SEC in Feb 2026. Mark Longenecker has 5 funds and deal vehicles on SEC file, including 3 single-deal SPVs. Estimated typical check: $200K–$600K. Mark Longenecker has dated investing activity in the last 12 months (latest Feb 2026).

Why Mark Longenecker is listed

Named as the only individual (Manager of the General Partner of the Issuer) on the Form D for Tonic Ventures FUND II, LP, a $20M venture fund (Feb 2026) (5 vehicles on file: 2 funds, 3 SPVs).

Source: SEC Form D: Tonic Ventures FUND II, LP (Feb 23, 2026) · 4 more sources

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Stages
Pre-seed, Seed
Typical check (est.)
$200K–$600K
Latest fund
$20M · Feb 2026
Latest dated activity
Feb 2026

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What does Mark Longenecker invest in?

Sector focus not yet verified

What has Mark Longenecker invested in recently?

  • Tonic Ventures FUND II, LP

    Invested through a fund

    Feb 2026

  • Perfectly Dosed

    Deal vehicle; company not disclosed

    May 2025

  • Tonic Ventures Fund I, LP

    Invested through a fund

    Apr 2024

Funds and deal vehicles Mark Longenecker filed with the SEC

  • Tonic Ventures FUND II, LP

    Fund · $20M offering

    Feb 2026

  • GM Seed SPV, a series of Tonic-Barrel, LP

    Deal vehicle · $75.5K offering

    Aug 2025

  • Tonic Ventures Fund I, LP

    Fund · $10M offering

    Jul 2025

  • Perfectly Dosed Fund I, a Series of Tonic-Barrel, LP

    Deal vehicle · $283K offering

    May 2025

  • OL-1113 Fund I, a series of Tonic-Barrel, LP

    Deal vehicle · $607K offering

    Mar 2025

Sources

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