Venture Builder · Barcelona ·2026
— Estudio nº 04
Costa Brava / ES
I / VI — Practice
Three ways we partner.
Operators before investors. We build investment-ready startups. Capital, craft and conviction — in equal measure.
001
VentureBuilding
Companies from first principles — teams, product, brand, capital.
002
Investment
Patient capital from pre-seed to Series A.
003
Investor Network
Matching investors Club Deals Opportunities Revision
II / VI — Thesis
We back founders building companies that shape tomorrow.
Sectors
Applied AI · Climate · Consumer · Fintech
Stage
Pre-seed & Seed. Selective Series A.
Geography
Iberia, Europe, select US.
III / VI — Portfolio
Selected work.
Climate · 2024
— 01
Marea
Ocean-grade carbon removal infrastructure.
Design tools · 2023
— 02
Forma studio
A canvas for the next generation of product teams.
Future of work · 2022
— 03
Estudio Nova
Workspaces designed for distributed craft.
Consumer · 2024
— 04
Inmo Project
Eco Hose building project
IV / VI — Studio
Operators.Designers.Believers.
Former founders and product leaders, shaped by the cities we love.
Mateo Riera
Founding Partner
Silvia Vidal
Partner, Investments
Andreu Sala
Partner, Studio
V / VI — Journal
Field notes.
Essay · 12 min
The next decade of European venture will be built quietly.
Memo
2026 focus areas.
Studio
Prototyping companies in 90 days.
Interview
In conversation with Marea.
V / VI — Contact
Let’s build somethingmeaningful.