Proprietary capital · Sector-agnostic · Early stage

We architect resilient companies — not just write checks.

Echo 3 is a partner firm investing proprietary capital and operational depth into early-stage founders. We build for endurance: governance, financial resilience, and disciplined execution toward the next strategic leap.

FoundedSão Paulo · 2025 Currently writingPre-seed → Series A
— 01 / Investment thesis

Enduring companies are forged at the convergence of capital, shared values, and disciplined execution.

Stage
Early
Pre-seed through Series A. We come in when product, model and team still need shaping.
Sectors
Agnostic
Fintech, deep-tech, industrial software, and platforms with structural moats.
Geography
LATAM-rooted
Brazil-based, globally minded. We back founders building beyond their home market.
Role
Hands-on
Board seat or advisory. We sit shoulder-to-shoulder with founders, not in a quarterly review.
— 02 / How we work

Three modes of engagement. One operating philosophy.

A · 01
Advisory
For founders we invest in. We sit on the board, architect the roadmap, refine the product, and structure go-to-market — translating vision into execution and execution into long-term value.
BoardRoadmapGTM
A · 02
Strategic Consulting
For companies seeking surgical support. We engage on specific business challenges — restructuring, capital strategy, operational reengineering — with hands-on execution at every stage.
RestructuringCapital strategyOps
A · 03
Investment Readiness
For startups preparing to raise. We strengthen what investors actually scrutinize: unit economics, governance, financial models, and the narrative arc of the round — before the first meeting.
Diligence prepModelsNarrative
— 03 / Portfolio

A small book of companies we partner with deeply — not a logo wall.

Oxus
Active · Board seat
Oxus Finance
Fintech · Cross-border
Global remittances, always through the smarter route. Oxus rebuilds the FX rails for emerging-market corridors — moving money where banks can't, at the price banks won't.
Stage at entryPre-seed
Year2025
Echo 3 roleLead · Board
Visit oxus.finance ↗
— 04 / Partners

The people who show up when it gets hard.

Mayra Koyama
Mayra Koyama
Co-Founder

An expert in financial engineering and strategic scaling, Mayra brings a wealth of experience in high-stakes corporate restructurings and value creation. As a former Partner at RCB Investimentos, she was instrumental in the firm’s strategic and financial evolution, overseeing its trajectory from a R$ 10 million valuation to a landmark R$ 2 billion strategic exit. She focuses on strengthening governance and preparing portfolio startups for their next strategic milestones.

Ex-RCB PartnerMackenzieInsperFDC
Marco Mattos
Marco Mattos
Co-Founder

A performance-driven investor with a deep background in operational turnaround and market innovation. During his tenure as a Partner at RCB Investimentos, Marco delivered exceptional realized annual return exceeding 200% on invested capital across strategic portfolios, while spearheading an operational overhaul that boosted productivity by 150%. A pioneer in the NPL market, he combines technical rigor with a hands-on approach to leadership. An alumnus of USP, Insper, and Singularity University, Marco leverages his role as a founder at Echo 3 to accelerate operational engineering and refine the business models across our portfolio.

USPInsperSingularity U.
Jeff Almeida
Jeff Almeida
Strategic Partner

A tech leader specializing in high-complexity, mission-critical systems. With a career spanning over three decades, he has led high-complexity, legacy-scale technological operations since 1994. As the lead architect of the integrated collection and legal ecosystem for RCB Investments Group, he prioritized peak performance and cost-efficiency at scale. At Echo 3, he serves as a strategic investor, leveraging a surgical technical perspective to validate business models and scale operations that seamlessly bridge financial robustness with technological innovation.

Since 1994Systems architectureScale ops

If you're building something that should outlast you — let's talk.

Founders contato@echo3.com.br

Send a brief deck or memo. We read everything proprietary capital allows us to read carefully — and reply within seven business days.

Office São Paulo · BR

By appointment only. We don't take meetings without context — please send materials first.