# Sandbrook Capital

Sandbrook Capital is an Asset Manager based in Stamford, United States.

## Overview

- **Organization type:** Asset Manager
- **Headquarters:** Stamford, United States
- **Region:** North America
- **Address:** Stamford, CT, United States
- **Founded:** 2022
- **Assets under management:** Undisclosed
- **Website:** sandbrooklp.com

## Regulatory record

- **CRD number:** 317009
- **SEC file number:** 801-122594
- **Registration status:** Registered
- **Reports private funds:** Yes
- **IAPD record:** https://adviserinfo.sec.gov/firm/summary/317009

## About

Sandbrook Capital is an SEC-registered investment adviser in Stamford, CT, registered since 2022. The firm manages approximately $4.6 billion in assets. It has 29 employees and 26 investment advisers.

## Sectors

- Energy Transition & Renewables
- Infrastructure
- ClimateTech

## People

- Alfredo Marti — Managing Partner & Co-Founder
- John A. Cavalier — Managing Partner & Co-Founder

## Questions

### Who runs investment decisions at Sandbrook Capital?

Alfredo Marti and John Cavalier serve as Managing Partners and co-founders, and they make investment decisions jointly. Both spent significant portions of their careers at Riverstone Holdings, where they developed the operational, control-oriented approach that Sandbrook now applies to climate infrastructure. The firm has not disclosed a separate CIO or independent investment committee.

### How does Sandbrook Capital source proprietary deal flow?

Sandbrook sources opportunities through deep developer relationships and its partners' decades of energy-sector networks. The firm targets construction-stage projects that require significant operational oversight — a profile that screens out many passive infrastructure funds. By offering to build and operate assets in-house rather than relying on third-party EPC contractors, Sandbrook positions itself as a differentiated partner for developers who want a hands-on, long-term capital provider.

### Is Sandbrook structured as a private equity firm or an infrastructure fund?

Sandbrook operates as a closed-end private equity fund but behaves more like a permanent-capital industrial holding company. The firm takes controlling stakes in renewable energy and grid assets, builds internal operating teams around those platforms, and intends to hold them long-term rather than exiting on a typical three-to-five-year cycle. This hybrid model distinguishes it from both conventional infrastructure funds and energy buyout shops.

### What investment stages does Sandbrook Capital target?

The firm targets construction-stage and late-development-stage energy projects and platforms. Sandbrook intentionally avoids early-stage technology risk, preferring assets with permitted sites, secured grid interconnection, and credible offtake contracts. Its focus on actual steel-in-the-ground construction risk rather than pre-revenue development risk is a defining feature of its investment mandate.

### How is Sandbrook related to Riverstone Holdings?

Sandbrook Capital was founded in 2022 by Alfredo Marti and John Cavalier, both former senior partners at Riverstone Holdings. The new firm applies a similarly operationally intensive, control-ownership model to climate infrastructure — a sector Riverstone historically approached through conventional energy private equity. Sandbrook is entirely independent, with no disclosed financial or governance ties to Riverstone.

### What is Sandbrook Capital's known posture on co-investments alongside external GPs?

Sandbrook has not offered co-investment rights to external limited partners. The firm's control-orientation and in-house operational model make passive co-investment alongside other GPs impractical. When Sandbrook bought rPlus Energies, it structured the deal to retain Gardner Group as a minority partner, but that reflected the specific asset's legacy ownership rather than a broader co-investment program.

## Related profiles

- [Sandalwood Capital Partners](https://altss.com/profile/sandalwood-capital-partners)
- [Sara Capital Partners](https://altss.com/profile/sara-capital-partners)

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Last updated: 2026-06-03T20:00:00.000Z

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