Heavybit

Quick read

Heavybit is a seed-stage venture capital firm founded in 2013 and headquartered in San Francisco, CA. It's the only fund focused exclusively on developer-first startups, writing $500K–$3M checks into pre-seed and seed companies building infrastructure, cybersecurity, and enterprise software. In July 2025, it closed two new funds totaling over $180 million.

Key facts

Founded

2013

Founders

James Lindenbaum, Tom Drummond

Employees

18

Sectors

devtools, enterprise, security, ai

Website

www.heavybit.com

Investment thesis

Heavybit invests at pre-seed and seed stage exclusively in developer-first companies — infrastructure, cybersecurity, and enterprise software — writing $500K–$3M checks into technical founders building category-defining products before the market catches up.

Recent activity

• Jul 2025fundraise
  Heavybit closed two new funds — Fund V (pre-seed and seed) and Opportunity Fund II (follow-on capital) — totaling over $180 million, its largest raise to date. everythingstartups.com
• Jul 2025press
  Alongside the fund close, Heavybit announced it would double down on hands-on support for founders building AI-native infrastructure, cybersecurity, and enterprise software. x.com
• 2025investment
  Joseph Ruscio co-led a $3M pre-seed round in Modiqo (product: Rote), an inference-optimization startup, alongside Seligman Ventures. linkedin.com
• 2025investment
  Heavybit backed exe.dev from inception — founded by David Crawshaw (Tailscale) and Josh Bleecher Snyder (Card.io, Canopy Climate) — a developer infrastructure company Ruscio described as something he uses almost daily. linkedin.com
• Sep 2022fundraise
  Heavybit closed Fund IV at $80 million, expanding check sizes to $500K–$3M and opening scope to early-stage devtool and enterprise software companies globally. x.com
• Jul 2025fundraise
  Heavybit closed its largest fund to date — over $180M — to back category-defining founders from Day 0, doubling down on hands-on support as AI accelerates software development. x.com
• Apr 22, 2026investment
  Heavybit welcomed exe.dev as a new portfolio member. heavybit.com
• Apr 1, 2026press
  Heavybit published its April 2026 update via LinkedIn. heavybit.com
• Mar 24, 2026press
  Portfolio company Streamfold announced it is joining Cursor. heavybit.com
• Mar 3, 2026press
  Heavybit published its March 2026 update via LinkedIn. heavybit.com
• Feb 12, 2026investment
  Portfolio company Blockdaemon was exited — Heavybit's most recent portfolio exit as of that date. cbinsights.com
• Jan 13, 2026investment
  Heavybit led a $4.5M round for Musical AI, which builds attribution technology to pay rightsholders when their work contributes to AI-generated tracks. cbinsights.com

Notable investments

• Modiqo (Rote)Pre-Seed ($3M)2025linkedin.com
• exe.devSeed2025linkedin.com
• ModiqoUndisclosedMay 28, 2026pitchbook.com
• exe.devUndisclosedApr 22, 2026heavybit.com
• Musical AISeedJan 13, 2026cbinsights.com
• MilestoneSeedNov 13, 2025cbinsights.com
• BrontoSeedOct 22, 2025cbinsights.com
• exe.devPre-seed2025linkedin.com
• LanceDBSeries A2025linkedin.com
• EventualSeed2025linkedin.com

Key people

Named individuals at the firm. We don't expose direct email or phone — use their LinkedIn for outreach.

• James Lindenbaum · Co-founder
  LinkedIn
• Tom Drummond · General Partner
  LinkedIn
• Joseph Ruscio · General Partner
  LinkedIn
• Susie S. · Chief Financial Officer
  LinkedIn
• Andrew Park · Partner
  LinkedIn
• Andrea Echstenkamper · Team Member
  LinkedIn

Sources

• Team | Heavybit
• Heavybit - Crunchbase Company Profile & Funding
• Everything Startup - New VC Funds - Heavybit
• Heavybit (@heavybit) / X
• Heavybit: Funding, Team & Investors | Startup Intros
• Heavybit - VC Fund Breakdown
• Heavybit | LinkedIn
• https://x.com/heavybit/highlights
• https://www.heavybit.com/press
• https://www.cbinsights.com/investor/heavybit
• https://www.linkedin.com/in/josephruscio/
• https://www.linkedin.com/in/aechstenkamper/
• https://x.com/heavybit

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