Ian Sigalow
Co-Founder & Managing Partner·Greycroft
Bio
Professional summary
Ian Sigalow is Co-Founder and Managing Partner of Greycroft in New York. According to his official profile, he co-founded the firm in 2006 and helps guide its operations, investment strategy, and long-term vision. His current portfolio includes Fetch, Flutterwave, HealthVerity, Hidden Road, Hippocratic AI, Landing, Newton Research, Pie Insurance, Public.com, Reflexivity, and Sequen AI. His past investments include companies that reached acquisition or IPO outcomes such as Venmo, Braintree, Shipt, Buddy Media, Plated, Bright Health Group, WorkFusion, Extreme Reach, and Data Plus Math. Before Greycroft, he founded StrongData, a payment encryption startup, and began his VC career at Boston Millennia Partners.
Investment focus
Stage, sector, and overall fit
Stage
Sector
Thesis
Notable companies
Selected portfolio companies the partner has backed
How to approach
Framing and angles for outreach
Pitch framing
Lead with AI-enabled transformation of large digital markets, especially where payments, healthcare, insurance, or marketplaces are involved.
Partneralization hooks
- 1Reference his founder background in payment encryption and investments in Venmo and Braintree for fintech-adjacent opportunities.
- 2Tie AI positioning to practical high-growth digital economy use cases.
Recent signals
What the partner has said or done recently
Greycroft profile lists current AI-related portfolio companies including Hippocratic AI, Newton Research, Reflexivity, and Sequen AI.
Background
Career, education, and skills
Career history
- GreycroftCo-Founder & Managing Partner2006 - Present
- StrongData (payment encryption startup)FounderPrior
- Boston Millennia PartnersInvestorEarly career
Education
- Columbia Business SchoolMBA, Business Administration2006
- Massachusetts Institute of TechnologyBS
Skills
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