M&A Deal Summary

Rainier Partners Acquires Kleen-Tech Services

On September 4, 2025, private equity firm Rainier Partners acquired business services company Kleen-Tech Services from Concierge Building Services

Acquisition Highlights
  • This is Rainier Partners’ 1st transaction in the Business Services sector.
  • This is Rainier Partners’ 8th transaction in the United States.
  • This is Rainier Partners’ 1st transaction in Colorado.

M&A Deal Summary

Date 2025-09-04
Target Kleen-Tech Services
Sector Business Services
Buyer(s) Rainier Partners
Sellers(s) Concierge Building Services
Deal Type Divestiture

Target

Kleen-Tech Services

Denver, Colorado, United States
Kleen-Tech Services is a janitorial service provider specializing in interior and exterior cleaning, disinfection, high-access cleaning, and floor care services. The company operates across the country under its nine brands: Kleen-Tech, Arnold’s, National Facility Services, ARC Maintenance, Sentinel Maintenance, Peterson Cleaning, Signature Facilities, Sonoran, and IFS Group. Kleen-Tech Services is based in Denver, Colorado.

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Buyer(S) 1

Buyer

Rainier Partners

Investor Investor Investor Investor Investor


Category Private Equity Firm
Founded 2020
PE ASSETS 400M USD
Size Middle-Market
Type Sector Agnostic
DESCRIPTION

Rainier Partners is a private equity firm focused on acquiring and investing in lower middle-market service-based companies. Areas of interest include business services, education, marketing, information services, financial services, consumer services, healthcare services, testing, industrial services, and engineering. Rainier Partners will consider businesses throughout North America with a preference for companies in the Western US and Canada. Prospective transaction situations include buyouts, divestitures, and turnarounds. Rainier Partners was formed in 2020 and is based in Seattle, Washington.


DEAL STATS #
Overall 8 of 8
Sector: Business Services M&A 1 of 1
Type: Divestiture M&A Deals 2 of 2
State: Colorado M&A 1 of 1
Country: United States M&A 8 of 8
Year: 2025 M&A 1 of 1
PREVIOUS DEAL
DATE TARGET DEAL TYPE VALUE
2024-12-19 WPAS

Mercer Island, Washington, United States

WPAS manages benefit plans as a third-party administrator (TPA) serving over 150,000 union members and their dependents on behalf of top Taft-Hartley trust funds, associations, and government entities in the region. WPAS was founded in 1953 and is based in Mercer Island, Washington.

Buy -

Seller(S) 1

SELLER

Concierge Building Services

United States

Category Company
Sector Business Services
DESCRIPTION

Concierge Building Services provides janitorial, security, concierge/front desk & building maintenance services.


DEAL STATS #
Overall 1 of 1
Sector: Business Services M&A 1 of 1
Type: Divestiture M&A Deals 1 of 1
State: Colorado M&A 1 of 1
Country: United States M&A 1 of 1
Year: 2025 M&A 1 of 1
PREVIOUS DEAL
DATE TARGET DEAL TYPE VALUE
2019-06-27 Kleen-Tech Services

Denver, Colorado, United States

Kleen-Tech Services is a janitorial service provider specializing in interior and exterior cleaning, disinfection, high-access cleaning, and floor care services. The company operates across the country under its nine brands: Kleen-Tech, Arnold’s, National Facility Services, ARC Maintenance, Sentinel Maintenance, Peterson Cleaning, Signature Facilities, Sonoran, and IFS Group. Kleen-Tech Services is based in Denver, Colorado.

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