# Horizon Advisors

Horizon Advisors is a Multi Family Office based in Westlake Village, United States.

## Overview

- **Organization type:** Multi Family Office
- **Headquarters:** Westlake Village, United States
- **Region:** North America
- **Address:** Houston, TX, United States
- **Founded:** 1999
- **Assets under management:** Undisclosed
- **Website:** horizonadvisorsla.com
- **LinkedIn:** https://www.linkedin.com/in/don-martin-cfp/

## Regulatory record

- **CRD number:** 341038
- **Registration status:** Registered
- **Latest Form ADV filing:** 2026-05-07T05:00:00.000Z
- **Reports private funds:** No
- **Private funds reported:** 0
- **IAPD record:** https://adviserinfo.sec.gov/firm/summary/341038

## About

Horizon Advisors was established in 1999 by Larry Maddox and Joe Thomson. Their prior CPA and tax advisory work supplied the initial client relationships that evolved into the current multi-family office platform. The firm allocates across private equity, real estate, hedge funds, private credit, infrastructure, and secondaries. It also executes direct co-investments and SPVs. Confirmed investment stages include buyout, growth equity, and venture capital. Geographic reach covers North America, Europe, Asia, and the Middle East & Central Asia. Technology emphases include AI/ML, biotech, and cybersecurity. No AUM figure or professional headcount appears in public materials. The firm lists an office in Westlake Village, California in addition to its Houston headquarters. No dated operational events from the past 24 months are recorded. Wealth origin traces directly to the founders' tax and accounting practice rather than a single operating company or industrial fortune.

## Sectors

- AgriTech & FoodTech
- ClimateTech
- Energy Transition & Renewables
- Digital Health
- Healthcare Services
- Industrial Tech
- Robotics & Automation
- SpaceTech
- AI/ML
- Biotech
- Cybersecurity

## Offices

- Westlake Village, CA, United States

## People

- Don Martin — CFP

## Questions

### Who runs investment decisions at Horizon Advisors?

Larry Maddox and Joe Thomson founded the firm. Don Martin is listed as a CFP on the firm's LinkedIn.

### How does Horizon Advisors source proprietary deal flow?

The firm draws on relationships developed through the founders' prior CPA and tax advisory practice.

### Does Horizon Advisors participate in fund commitments or only direct deals?

It uses both fund-of-funds commitments and direct co-investments or SPVs.

### What investment stages does Horizon Advisors typically target?

The firm targets buyout, growth, and venture capital stages.

## Related profiles

- [Horizon21 AG](https://altss.com/profile/horizon21-ag)
- [Horizon Point Capital](https://altss.com/profile/horizon-point-capital-llc-gordon-family-office)

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Last updated: 2026-07-08T20:25:17.185Z

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