Atar Capital Successfully Completes the Sale of RWS Facility Services

LOS ANGELES— December 8, 2021Atar Capital, a Los Angeles-based global private investment firm,
announced today that it has entered into a definitive agreement to sell RWS Facility Services (RWS)
to Quest Resource Holding Corporation (NASDAQ: QRHC) (Quest), a national leader in environmental
waste and recycling services.

RWS delivers innovative hands-on managed solutions for waste management, commodity recycling and
facilities services. Its base of blue-chip national and regional customers includes big-box retailers, quick
service restaurants (QSRs), industrial manufacturers, retail centers, enclosed and open-air malls and
mixed-used multi-tenant properties. RWS is dedicated to providing incremental commodity revenue
streams for its customers by utilizing its innovative asset-light service model. RWS is headquartered in
Chadds Ford, Pennsylvania with offices across the United States.

Atar Capital acquired RWS in September 2017. Under Atar Capital’s ownership, RWS achieved
significant revenue and profitability growth through a focus on diversifying the company’s range of
services and addressable end markets. The company improved its core business processes, relying on a
distributed workforce and significant investments in back-office technology. RWS further developed its
business through the acquisition of Sustainable Solutions Group (SSG) in 2019, providing expansion into
the real estate investment trust (REIT) industry. In addition, RWS expanded its service offerings to
provide a host of managed facility and building services to its portfolio of existing customers, including
HVAC, engineering maintenance and landscaping, among other services. All these impressive
accomplishments resulted in exceptional year-over-year financial performance.

Commenting on the sale of the company, Cyrus Nikou, founder of Atar Capital, said, “In just four years,
RWS showed an unprecedented momentum in diversifying its business, expanding its service lines and
increasing its customer base. We are extremely proud of these accomplishments in partnership with this
talented group of individuals.”

“Our partnership with Atar Capital has been invaluable. They played a crucial role in helping us shape
and grow the business into one that offers the highest quality of facility management services across the
nation,” said Anthony DiIenno, president and CEO of RWS. “We look forward to the opportunities the
new ownership will offer our talented teams and valued clients.”

Robert Lezec, senior managing director of Atar Capital, added, “We are pleased to have acquired and
owned this exceptional asset and are proud of the progress that RWS achieved over the past four years.
We were particularly impressed by the resilience and dedication of the RWS team through the COVID-19
pandemic to ensure the company remained an essential service provider to many large and small
corporate, retail and industrial businesses throughout the nation.”

Atar’s investment team for the transaction included Nikou, Lezec, Managing Directors Stanley Huang
and Vijay Mony and Vice President Roman Zelinsky. Dykema provided legal counsel to Atar Capital and
TM Capital served as the exclusive sell-side financial advisor in the transaction.

About Atar Capital

Atar Capital is a global private investment firm that acquires a wide range of lower middle market
businesses exhibiting opportunities for growth, revitalization and significant value creation. Atar Capital’s
principals have completed more than 75 private equity transactions across North America, Europe and
South America.

Atar Capital’s combination of operational expertise, industry knowledge and investment experience
provide a unique edge in creating value and working as a true partner with its portfolio companies. The
firm assists in activities ranging from growing the business to improving operations and financial
performance, leveraging all available resources and talent within Atar’s leadership team, as well as its
bench of seasoned senior advisors with deep sector and functional expertise. For more information, please

About Quest Resource Holding Corporation

Quest is a national provider of waste and recycling services that help businesses excel in achieving their
environmental and sustainability goals and responsibilities. Quest delivers focused expertise across
multiple industry sectors to build single-source, client-specific solutions that generate quantifiable
business and sustainability results. Addressing a wide variety of waste streams and recyclables, Quest
provides information and data that tracks and reports the environmental results of Quest’s services, gives
actionable data to improve business operations, and enables Quest’s clients to excel in their business and
sustainability responsibilities. For more information, visit

Media Contact:
Patricia Kilgore
Sterling Kilgore, Inc.

Atar Capital Contact:
T.J. McCaffrey
Atar Capital