Building environmental service platforms with a focus on creating long term value.

We are an investment firm focused on acquiring lower middle market companies in the environmental services industry. We help high performing management teams maximize their potential and become the succession plan for founder led owners that are looking to retire.

Our Approach

Buy good businesses and turn them into growth platforms. We help the company:

Build-out strong management teams.
Evolve into a high-performance culture that makes data driven decisions.
Focus on a small number of KPIs that can maximize operating leverage and expand margins.
Empower the management team with tools and capital to accelerate growth through organic initiatives and add-on acquisitions.

Founded in 2015, the Castle team has over 30 years of combined experience investing in and growing companies, cumulatively working on over 100 transactions in excess of $5 billion in enterprise value.

Core Values

Reputation

We value our reputation as one based on honesty, integrity, high performance, partnership – and ultimately being good partners. This translates to all of our stakeholders.

Employees

We are not a buy and cut private equity shop, we are buy and build. We value our employees and their contributions.

Customers

We strive to really understand our customers and to exceed their expectations by operating our companies to be best-in-class, focused on quality of service.

Investors

We aim to be good stewards of capital with an unwavering focus on creating value and driving returns.

Environment

We invest in businesses that are benefitting the environment and ensuring a better future.

Investment Criteria

We invest into healthy profitable companies that are generating $20 to $100 million revenue. We work with Sellers and management teams to understand their acquisition objectives, and then craft an ideal deal structure based on that criteria.

Target Company Size

$20 to $100 million revenue for Platform Acquisitions

$1 to $50 million revenue for Add-On Acquisitions

Industry

Environmental, Safety, Compliance

Business Type

Services, Software, Technology

Exit Reason

Retirement, 100% Exit, Take Chips of Table,

Management Team Buyout, Corporate Divestiture

Location

United States and Canada

Preferred Stake

Majority

Castle’s Investment Criteria

Waste Management, Recycling, & Resource Recovery

Environmental testing, monitoring, & analytics

Utility Management, Maintenance, & Metering

Safety, Compliance, & Inspections

Sustainable Agriculture

Remediation

Tire Disposal & Recycling

Acquired in 2017. Provided tire waste collection and processing in the Pacific Northwest. Rolled into Castle’s tire recycling platform.

Exited in February 2024.

Tri-C Recycling

Acquired in 2021. Provided tire waste collection and processing in Northern California. Rolled into Castle’s tire recycling platform.

Exited in February 2024.

Desert Services

Minority position in 2024. Provide environmental services for construction projects in the Phoenix area.

Waste Recovery West

Acquired in 2017. Provided tire waste collection and processing in California. Rolled into Castle’s tire recycling platform.

Exited in February 2024.

Superior Tire Disposal

Acquired in 2021. Provided tire waste hauling services in Northern California. Rolled into Castle’s tire recycling platform.

Exited in February 2024.

Acquired in 2017. Provided tire waste collection and processing, and 360 acre landfill in eastern Oregon. Rolled into Castle’s tire recycling platform.

Exited in February 2024.