Fundraising Fox
Elaine Zelby
InvestorFounderVenture Partner at SignalFire · Founder at Tofu
Stanford, California
Writes $5M – $20M checks · typically $12.5M
FoundedTofu
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About
Elaine Zelby is co-founder and Chief Revenue Officer at Tofu, an agentic demand generation platform for B2B marketing teams. Previously, she worked as an early-stage investor at SignalFire and held go-to-market and marketing leadership roles at early and growth-stage startups. Zelby publishes a weekly newsletter called 3 Things and hosts the (un)sexy podcast.
Contact· self-published, not guessed
Founder at Tofu
Intro paths
In turn, Elaine can intro founders to Tofu's investors below.
Tofu's investors · 13
Co-founders at Tofu
Deals · 1
TestBoxBoard seat
via SignalFire · filed Oct 2025 · $11.4M raise
Attribution from SEC filings, press coverage, and firm rosters.
Other disclosed investments
Investor
Sources: SEC Form D filings · curated public sources.
Colleagues at SignalFire
Network6
Investors connected to Elaine in public investor directories — a warm-intro map.
Frequently asked questions
- Who is Elaine Zelby?
- Elaine Zelby is co-founder and Chief Revenue Officer at Tofu, an agentic demand generation platform for B2B marketing teams. Previously, she worked as an early-stage investor at SignalFire and held go-to-market and marketing leadership roles at early and growth-stage startups. Zelby publishes a weekly newsletter called 3 Things and hosts the (un)sexy podcast.
- Where does Elaine Zelby work?
- Elaine Zelby is Founder of Tofu and Venture Partner at SignalFire.
- What check size does Elaine Zelby write?
- Elaine Zelby typically writes checks of $5M – $20M.
- What companies did Elaine Zelby found?
- Elaine Zelby founded Tofu.
- What boards does Elaine Zelby sit on?
- Elaine Zelby holds tracked board seats at TestBox.
- What companies has Elaine Zelby invested in?
- Investments tracked here include Included AI, TestBox.
Founder mafias
Stanford University mafia2,297
Also came through, then founded or led a company.
ConsenSys mafia43
Also came through, then founded or led a company.
Slack mafia28
Also came through, then founded or led a company.
SignalFire mafia14
Also came through, then founded or led a company.
About this profile. Compiled from public sources — SignalFire's own website, regulatory filings and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights