Sterling Investment Partners

What Sterling Investment Partners does

Sterling Investment Partners is a middle-market private equity firm founded in 1991 and headquartered in Greenwich, Connecticut. The firm manages five institutional funds representing over $3.2 billion in committed capital and has executed more than 280 transactions totaling $34+ billion in gross transaction value. Sterling targets distribution and business services companies with $50-500 million in revenue, $15-50 million in EBITDA, and $150-500 million in enterprise value, investing $100-450 million of equity per transaction. Its investment thesis centers on recession-resistant segments characterized by secular growth tailwinds, significant fragmentation, recurring demand dynamics, and competitive advantages from scale — examples include aftermarket and MRO parts, building and facilities services, consumables, and essential/outsourced services.

Sterling's revenue model is a standard private equity structure: it charges limited partners management fees (typically 1.5-2% of committed capital) across fund vintages and earns 20% carried interest on profitable realizations from portfolio companies. The firm pursues a partnership model with management teams, supporting organic growth and add-on acquisitions within platform companies. Deal sourcing relies on proprietary origination, intermediary relationships, and repeat management-team relationships. The current Fund V closed at $1.6 billion in November 2025, surpassing its $1.25 billion target.

The firm's active portfolio spans more than ten platform companies including Cyber Advisors (cybersecurity and managed IT), PROtect (safety and risk management), Verdantas (environmental consulting), Banner Industries (semiconductor distribution), Mr. Greens (food distribution), Xylem Kendall (vegetation management), Camp (facility services), AIMS Companies (infrastructure inspection), Markon Solutions (federal government services), Aurora Parts and Accessories (aftermarket parts), and HeartLand (commercial landscape). Sterling has no disclosed core technology platform; its operational infrastructure consists of investor portals (Dynamo/Altareturn) and standard CRM/administrative systems.

Name

Sterling Investment Partners

Legal name

Sterling Investment Partners Advisers, LLC

Website

https://sterlinglp.com

Company type

Private

Founded year

1991

Operating status

Operating

Headcount range

11–50 employees

Short description

Sterling Investment Partners is a middle-market private equity firm founded in 1991 that manages $3.2+ billion across five funds, investing $100-450 million per transaction in distribution and business services companies with $50-500 million in revenue and recession-resistant end markets.

Ownership category

akta.pro rank

Product category

Private Equity Fund Management

NAICS

Portfolio Management and Investment Advice (52394)

SIC

Investment Advice (6282)

akta.pro primary industry

Large-Cap / Mega-Fund Buyout (FSANABAA)

Keywords

• Middle market private equity
• Private equity fund management
• Buyout investment services
• Distribution sector investing
• Business services investing

Headquarters

HQ city

Westport

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Fund Management: Sterling earns management fees on committed capital across its funds (Fund I through Fund V), typically 1.5-2% of committed capital. The firm also earns carried interest (20% of profits) upon successful realizations from portfolio companies.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Sterling Investment Partners is a middle-market private equity firm that raises and manages institutional investment funds (currently Fund V at $1.6 billion) to acquire controlling equity stakes in U.S. distribution and business services companies. The firm invests $100-450 million of equity per transaction in businesses with $50-500 million of revenue and $15-50 million of EBITDA, partnering with management teams to drive organic growth, add-on acquisitions, and operational improvements. Sterling earns revenue through management fees on committed capital and carried interest on profitable realizations.

Product overview

Sterling Investment Partners is a middle market private equity firm offering a single unified investment management service through its institutional funds (currently Fund V at $1.6 billion). The firm's investment strategy focuses on distribution and business services sectors, providing equity capital ranging from $100-450 million per transaction to companies with $50-500 million in revenue. The firm maintains an active portfolio of companies including cybersecurity providers (Cyber Advisors), environmental services firms (Verdantas), infrastructure services (AIMS Companies, Xylem Kendall, HeartLand), food distribution (Mr. Greens), facility services (Camp), federal government services (Markon Solutions), and various specialty distributors. Sterling partners with management teams to build businesses through organic growth, add-on acquisitions, and operational improvements.

Differentiator

Problem solved

Functional benefit

Products and services

• Sterling Investment Partners Fund V The fifth institutional private equity fund managed by Sterling, deploying $100-450 million of equity per transaction into U.S. middle market distribution and business services companies. Target companies have $50-500M revenue and $15-50M EBITDA.
• Private Equity Fund Management Services Ongoing investment management services covering equity capital deployment, strategic guidance, and operational support for portfolio companies in distribution and business services sectors. Includes sourcing, diligence, structuring, and portfolio oversight across five institutional fund vintages.

Quantifiable outcome

• $34+ billion in gross transaction value since inception
• +2 more outcomes

Named customers16 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Two partnerships are on record, tiered core.

• Markon SolutionscoreStrategic or Co-development Partner · 20 February 2026Markon, backed by Sterling Investment Partners, acquired Millennium Corporation to expand mission critical cyber capabilities. Combined entity serves defense, intelligence, and federal civilian agencies as a Full Spectrum Cyber Provider.
• PLEXcoreStrategic or Co-development Partner · 2 December 2025Markon, backed by Sterling, acquired PLEX to expand cybersecurity and AI capabilities. PLEX provides services to U.S. Cyber Command, Army Materiel Command, and the Air Force.

Scale indicators6 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Wynnchurch Capital: Middle-market private equity firm with comparable AUM scale and a similarly operationally intensive, lower-middle-market focus on distribution, business services, and industrial companies — directly comparable investment criteria and check size.
• Olympus Partners: Middle-market PE firm with multi-billion-dollar fund vehicles and a focus on business services, consumer products, and distribution — overlapping investment criteria with Sterling in check size, sector focus, and partnership-style investing.
• American Securities: Established middle-market private equity firm investing in distribution, business services, and industrial growth companies with comparable equity check sizes and a similar long-hold, partnership approach.
• Tailwind Capital: Middle-market PE firm focusing on business services, industrial services, and consumer-related distribution — directly overlapping with Sterling's stated sector focus and equity check range.
• New Mountain Capital: Middle-market PE firm with a focus on business services, federal services, and distribution-like recurring-revenue platforms — overlapping with Sterling's portfolio emphasis on federal services (Markon) and recurring-demand verticals.
• Stone Point Capital: Middle-market PE firm investing across business services, distribution, and financial services; comparable fund sizes and similar focus on services-oriented platforms with strong recurring revenue.
• The Jordan Company: Middle-market PE firm with comparable check sizes focused on business services, distribution, and industrial verticals — overlapping investment criteria with Sterling's middle-market buyout approach.
• Audax Group: Middle-market PE firm known for an aggressive add-on acquisition strategy in business services and industrials — directly comparable to Sterling's buy-and-build approach evidenced at Verdantas and Markon.
• Court Square Capital Partners: Middle-market PE firm investing in business services, distribution, and healthcare services with comparable fund sizes and a similar partnership-with-management orientation.
• AEA Investors: Middle-market PE firm with a long operating history investing in distribution, business services, and consumer companies — comparable scale, vintage history, and sector concentration to Sterling.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/sterling-investment-partners

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Subsidiaries14 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A29 records

Investments7 records

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sterling Investment Partners