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Startup Mavericks

sum.vc

We invest in visionary founders at the earliest stages who are working on ideas that create a better future, focusing on FinTech, PropTech, IoT, AI, MedTech, CleanTech, and ventures making significant impact.

Check Size

$100K - $1M

Focus Areas

Fintech, Proptech, Ai Ml

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Investment Thesis

SUM Ventures focuses on early-stage seed investing (Pre-Seed to Series A) with a philosophy of phased capital deployment rather than upfront over-capitalization. As stated in their FAQ: ‘seed-stage investing is not just our core focus—it’s where we believe we can create the most impact.’ They prioritize internal rate of return (IRR) over assets under management, taking a focused, thoughtful approach rather than a ‘spray and pray’ strategy. The firm emphasizes hands-on collaboration with founders from day one, helping them navigate challenges and identify key inflection points while scaling capital alongside their progress.

What Sets Them Apart

  • Phased investment approach that moves capital in tranches aligned with founder progress rather than one large upfront check
  • Hands-on value-added support beyond capital: strategic guidance, operational expertise, network introductions, and peer community
  • Extensive network including corporate partnerships with Siemens, Douglas Elliman, and other strategic players who provide invaluable expertise
  • All partners are investors in the fund, aligning interests with entrepreneurs and ensuring higher accountability
  • Very early stage focus with initial checks typically ranging from $100k-$1M, with reserved capital for follow-on investments
  • Founders describe SUM as 'often a founder's first call' for both celebrating wins and addressing challenges
  • Strong track record: 233% IRR over past 4 years, $18B+ total team exit value, 53 funds have followed them as first investors

Portfolio Highlights

LiveEasy

Proptech

DressX

Consumer Technology

Purlin

Proptech

UNest

Fintech

Ovation

Fintech

Irrigreen

Cleantech

Automotus

Iot

Brius

Medtech

+ 32 more companies in their portfolio

Investment Team

20 Partners at Startup Mavericks

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