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Ian Sigalow

Ian Sigalow

Co-Founder & Managing Partner·Greycroft

New York, NY

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

Venture investments across early and growth stages

Sector

AIFintechDigital economyHealth technology

Thesis

AI frontierDigital economyFintech and paymentsHealthcare technology

Notable companies

Selected portfolio companies the partner has backed

VenmoBraintreeShiptBuddy MediaFlutterwaveHealthVerityHippocratic AIPublic.comPie Insurance

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.

Personalization hooks

  1. 1Reference his founder background in payment encryption and investments in Venmo and Braintree for fintech-adjacent opportunities.
  2. 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

Venture CapitalFintechEnterprise SoftwareAI InvestingConsumer Tech

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