Fund profile / United States

Worldbuild Fund I

Geography: United States
Stage: Pre-Seed
Fund size: $30M
Focus: AI/ML, Data Infrastructure, Developer Tools and Infrastructure Tech
Signals: Published

N°01 / About

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.

N°02 / Thesis

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

15+ portfolio companies deployed: SF Compute, Browserbase, Cowboy, Space Corp, Truffle, Fractal Power, Spinor, Interfere, Flower, Computer, Armory, Medical, Actual, Athanorexternal

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

13 signals on Worldbuild Fund I

5 bullish · 2 contrarian · 3 pitch do's · 2 don'ts · 1 GP profile, each with its source. From €9/month, cancel anytime.

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Facts

Fund Overview

Fund Size$30M

Saves0

Website

People

Key People

Sumeet Singh

Sumeet SinghFounder / Managing Partner

N°04 / See also

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