Fundraising Fox
Sum Ventures
Venture capitalSeed · 36 people tracked
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Investment thesis
SUM Ventures is a generalist seed-stage fund operating on the thesis that small funds and emerging managers structurally outperform. It enters broadly with smaller initial checks at seed and earns the right to invest more as founders execute, ultimately deploying roughly 80% of capital into the top third of its portfolio. The firm keeps rounds disciplined to avoid overcapitalization and preserve product-market fit. Beyond capital, it positions itself as a platform, hosting monthly meetings that connect investors, operators, and angel groups to drive sourcing and co-investment. LPs can gain additional exposure to high-conviction companies through SPVs and direct allocations.
Source: firm website, verified Oct 1, 2026.
Team · 36 people
from the firm's website & public directories
What they invest in
from 7 of 8 portfolio companiesFintech ×2PropTech ×2SaaS ×2AgTech ×1AI & Machine Learning ×1B2B Marketplaces ×1Circular Economy ×1Climate Tech ×1
HQs:United States×7
Investments · 8 tracked
founders shown can be your intro pathBy year:2026 · 12025 · 12022 · 13 dated
Automotus uses computer vision and AI to help cities and airports manage commercial vehicle traffic and reduce CO2 emissions.
AI & Machine LearningClimate TechGovTechMobility & TransportationSaaSLos Angeles, US
Harris Lummus(Executive Officer, Director)Jordan JustusinHarris Lummisin
BoardOliver Libby(Director)Tom Spengler(Director)Gabe Klein(Director)in
Co-investorsBand of AngelsE8 AngelsEmerging VenturesIrishAngelsKeiki CapitalPartnership Fund for NYC+5 more
GoBuild provides payment and working capital solutions designed for small construction firms, addressing cash flow delays through deposit financing, project-based lending, and subcontractor payment management.
FintechPropTechSan Francisco, US
Chapman Snowden(Founder)inDrew Barrett(Founder)in
Co-investorsCapmontY CombinatorGlobal Founders CapitalGoodwater CapitalNorthwestern Mutual AcceleratorPrecursor Ventures+5 more
Grapefruit Health provides healthcare organizations with a workforce of trained clinical students—recruited from pre-med, nursing, pharmacy, social work, and similar programs—who are integrated into care team workflows to close care gaps and address staffing shortages.
Digital HealthFuture of WorkHealthtechSaaSChicago, US
Eric Alvarez(Executive Officer, Director)in
Co-investorsAntlerChicago Early Growth Ventures (CEGV)Everywhere VenturesGoAhead VenturesLongJump VenturesMairs & Power VC+1 more
Irrigreen manufactures smart in-ground sprinkler systems for residential lawns that use mapping technology to reduce water waste by up to 50% compared to traditional irrigation.
AgTechHardwareIoT
Co-investorsBerkeley Angel NetworkBURNT ISLAND VENTURESEcho River CapitalMFV PartnersSand Hill AngelsTamiami Angel+2 more
Rent a Backyard connects homeowners with prefab home builders and designers to add accessory dwelling units, mother-in-law suites, and other backyard structures to properties.
B2B MarketplacesConstruction TechMarketplacesPropTechSan Francisco, US
Brian Bakerman(Founder)inSpencer Burleigh(Founder)in
Co-investorsK2 GlobalY CombinatorZillionizeAsymmetry VenturesCleo CapitalGreat Wave Ventures+4 more
PlantSwitch manufactures home-compostable food packaging and cutlery products from agricultural waste, particularly rice hulls, using a proprietary CompostZero™ bio-resin that breaks down in backyard compost without leaving microplastics.
Circular EconomyFoodTechNew MaterialsSanford, US
MAXIME BLANDIN(Executive Officer, Director)DILLON BAXTER(Executive Officer, Director)in
BoardSamuel Phelps(Director)
Co-investorsFlow Capital
Transparency Analytics provides quantitatively driven credit ratings for corporate issuers and private credit transactions.
FintechNew York, US
Christopher Tolles(CFO)Michael Brawer(CEO)inRobert Boresta(Executive Officer)
BoardMichael Fedorochko(Director)Christopher Gottschalk(Director)in
Co-investorsCore Venture CapitalDeciensFJ LabsMouro CapitalAllianz Life VenturesCore Innovation Capital
Other
Tracked investments with no reachable website or further public details — typically companies that wound down, renamed, or were absorbed.
FantasyLife
Portfolio news
latest coverage across their companiesAutomotus · automotus.ai · Dec 19, 2025
Transparency Analytics · finsmes.com · Dec 18, 2025
Grapefruit Health · grapefruit.health · Aug 19, 2025
Irrigreen · prnewswire.com · Apr 22, 2025
Frequently asked questions
- How many investments has Sum Ventures made?
- Sum Ventures has 8 tracked investments, including 2 dated in the last 24 months.
- What stage does Sum Ventures invest at?
- Sum Ventures invests at the Seed stage.
- What sectors does Sum Ventures focus on?
- Sum Ventures focuses on AI & Machine Learning, Climate Tech, Fintech, Healthtech, PropTech, Sector Agnostic.
- Does Sum Ventures lead rounds?
- Sum Ventures typically participates in rounds rather than leading them.
- Who does Sum Ventures co-invest with?
- Sum Ventures most often shares deals with Flow Capital, IrishAngels, Rebellion Ventures, among 11 tracked co-investors.
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