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Worldbuild Fund I

United States
Pre-Seed
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About Worldbuild Fund I

Worldbuild Fund I is a $30M day-zero and seed fund from a16z alum Sumeet Singh, raised roughly a year after the firm's founding (reported May 2026). Singh publishes research theses on emerging technology intersections ahead of investing, targeting AI infrastructure, computing and physical/industrial software. Portfolio includes SF Compute, Aetherfux, Truffle, Browserbase, Built Technologies, and Toggl.

Investment Focus

Location / RegionUnited States
Funding StagePre-Seed
Industry Focus
AI/ML
Data Infrastructure
Developer Tools
Infrastructure Tech
Supply Chain

Investor Signals Profile

active

Sweet Spot

Day-zero and seed founders building AI infrastructure, compute, or physical/industrial software with a thesis-fit narrative

ai-infrastructure
compute
physical-supply-chain
industrial-software
day-zero

Bullish Signals

Raised $30M debut fund within about a year of launch — fast fundraising validates LP demandweb
Portfolio includes SF Compute and Browserbase, both fast-growing AI infrastructure namesweb
Thesis-publishing approach builds inbound deal flow and founder trust ahead of check-writingweb
Expanded portfolio to 10+ companies including Space Corp and Athanor — strong deployment velocityexternal

Contrarian Signals

Solo-GP structure (no confirmed additional partners) concentrates key-person riskweb
Debut fund with no realized track record yet — thesis is unproven at scaleweb

Founder Do's

Reference Worldbuild's published theses to show alignment before reaching out
Highlight day-zero or very early traction — this is a true pre-seed/seed fund
Show a physical-world or infrastructure angle, not just a pure SaaS wrapper

Founder Don'ts

Dont pitch late-seed or Series A rounds — check sizes are early-stage sized
Dont ignore the published thesis content — cold pitches outside stated focus areas are deprioritized

Key GPs & Partners

SS
Sumeet Singh
Founder / Managing Partner
thesis-drivena16z-alumtastemaker

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Fund Overview

Fund Size$30M
Saves0
Website

Key People

Sumeet Singh

Sumeet SinghFounder / Managing Partner

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