# Madrone Capital Partners

Madrone Capital Partners is a Single Family Office based in Menlo Park, United States.

## Overview

- **Organization type:** Single Family Office
- **Headquarters:** Menlo Park, United States
- **Region:** North America
- **Address:** Menlo Park, CA, United States
- **Founded:** 2005
- **Assets under management:** Undisclosed
- **Website:** madrone.capital
- **LinkedIn:** https://www.linkedin.com/company/madrone-capital/

## Regulatory record

- **Reports private funds:** No

## About

Madrone Capital Partners was established in 2005 by Greg Penner, son-in-law of Rob Walton. The office manages capital originating from the Walton family’s controlling interest in Walmart. Penner also serves as Chairman of Walmart and co-owner of the Denver Broncos. The firm allocates across early-stage venture through late-stage growth equity and private equity. Asset classes include direct co-investments, SPVs and fund-of-funds commitments. Confirmed positions span technology, consumer and sustainability sectors. Geographies include North America and Africa. Investment stages cover seed through series B and expansion rounds. Team size and total deployment remain undisclosed. The office maintains its headquarters in Menlo Park. Adjacent vehicles include the Penner Family Foundation and the Rob and Melani Walton Foundation. No operational events from the last 24 months appear in available records. Madrone operates as a single-family office with direct participation in the Denver Broncos ownership group alongside Rob Walton and Mellody Hobson. This structure ties investment decisions to both family governance and professional sports franchise operations.

## Sectors

- Energy Transition & Renewables
- ClimateTech
- FinTech
- Industrial Tech
- Sports & Wellness
- Media & Entertainment
- HRTech

## People

- Greg Penner — Founder
- Jamie McJunkin — Co-founder and General Partner
- Thomas Patterson — General Partner

## Questions

### Who runs investment decisions at Madrone Capital Partners?

Greg Penner founded the firm and leads alongside co-founder Jamie McJunkin and General Partner Thomas Patterson.

### How does Madrone Capital Partners source proprietary deal flow?

The office draws on family networks including Walmart board relationships and the Denver Broncos ownership group.

### Is Madrone Capital Partners structured as a single family office or does it operate more like a venture firm?

It functions as a single family office that also makes direct venture and growth investments.

### Does Madrone Capital Partners participate in fund commitments or only direct deals?

The firm uses both fund commitments and direct co-investments or SPVs.

### What investment stages does Madrone Capital Partners typically target?

Stages range from seed and series A through growth and late-stage rounds.

### Does Madrone Capital Partners maintain philanthropic structures, and how are they separated?

Separate vehicles include the Penner Family Foundation and the Rob and Melani Walton Foundation.

## Related profiles

- [Madison Family Office Services](https://altss.com/profile/madison-family-office-services)
- [Maelstrom](https://altss.com/profile/maelstrom-arthur-hayes-family-office)

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

Canonical page: https://altss.com/profile/madrone-capital-partners-rob-walton-family-office

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