# Sterling Investment Partners

Sterling Investment Partners is a Private Equity based in Greenwich, United States.

## Overview

- **Organization type:** Private Equity
- **Headquarters:** Greenwich, United States
- **Region:** North America
- **Address:** Westport, CT, United States
- **Founded:** 2004
- **Assets under management:** Undisclosed
- **Website:** sterlinglp.com
- **LinkedIn:** https://www.linkedin.com/company/sterling-investment-advisors-ltd

## About

Sterling Investment Partners is an SEC-registered investment adviser in Greenwich, CT, established in 2012. The firm manages $3.9 billion in assets. It employs 24 people, including 17 investment advisers.

## Sectors

- Business Services
- Industrial Tech
- Transportation & Logistics
- Consumer Services
- Healthcare Services

## People

- Charles W. Santoro — Co-Founder & Managing Partner
- Douglas L. Newhouse — Co-Founder & Managing Partner
- M. William Macey Jr. — Co-Founder & Senior Advisor

## Questions

### What is Sterling Investment Partners' core investment strategy?

Sterling executes control-oriented buyouts and growth recapitalizations in North American middle-market services and light manufacturing. The firm targets companies with enterprise values between $100 million and $500 million, writing equity checks of $50 million to $150 million. The strategy is sector-generalist but concentrated within business services, route-based logistics, essential infrastructure, and specialized outsourcing. Sterling acts as a majority or controlling investor and supplements organic growth with add-on acquisitions.

### How is Sterling Investment Partners structured and how large is its fund?

Sterling manages a single buyout strategy through a series of institutional commingled funds. The firm closed its third flagship vehicle, Sterling Investment Partners III, at $543 million in 2018. The partnership has not launched adjacent credit, venture, or real estate vehicles. Limited partners have historically included university endowments, foundations, pension funds, and family offices, though the firm does not publicly disclose its current LP composition.

### Who founded Sterling Investment Partners and what is their background?

Charles W. Santoro, Douglas L. Newhouse, and M. William Macey Jr. co-founded Sterling in 2004. The three principals previously worked together at Nassau Capital, the private equity firm that managed investments for Princeton University's endowment, and later at CVC Capital Partners. Macey transitioned to a Senior Advisor role, while Santoro and Newhouse continue as Managing Partners leading the firm's day-to-day operations and investment decisions.

### Where does Sterling Investment Partners invest geographically?

Sterling's investment mandate is exclusively North American, with a focus on the United States and, to a lesser extent, Canada. Within that geography, the firm is agnostic about location, seeking founder-owned or family-held businesses with durable revenue profiles regardless of region. The firm has historically sourced deals across the Midwest, Southeast, and Northeast United States.

### How does Sterling Investment Partners differ from larger middle-market private equity firms?

Sterling has deliberately avoided the path of scaling into a multi-strategy, multi-product asset manager. The firm has raised three funds of comparable size since 2004, maintained the same leadership structure, and avoided international expansion. This creates a distinctive alignment profile — the partnership does not face pressure to deploy capital across new strategies to justify a higher management-fee base. For allocators, this offers concentrated, strategy-pure exposure to US middle-market services buyouts.

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

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