Since our founding in 1982, The Sterling Group has owned a wide variety of companies. Each one has contributed to our depth of experience. (Date is year of investment.)

Stackpole International (2011)
A manufacturer and sole source supplier of highly-engineered oil pumps and powdered metal components to automotive original equipment manufacturers.

Velcon Filters, LLC (Velcon) (2009)
A niche manufacturer of fluid filtration systems for a variety of domestic and international end markets, including jet fuel.

Roofing Supply Group (RSG) (2006)
One of the largest wholesale distributors of roofing supplies and related materials in the United States.

BTEC Turbines (2006)
Provider of services and equipment to the power industry.

Hudson Products (2006)
Global manufacturer of air cooled heat exchangers and axial flow fans.

Panolam Industries (2005)
Manufacturer of decorative laminate panels for residential / commercial indoor surfacing applications.

Propex (2004)
Producer of carpet backing, geosynthetic, concrete, furnishing, and industrial fabrics and fibers.

North American Energy Partners (NAEP) (2003)
NAEP is the leading provider of site preparation, mining and other services in the Alberta Oil Sands and Western Canada.

HydroChem Industrial Services (2003)
Provider of industrial cleaning services to a variety of process industries

Exopack (2001)
Manufacturer of paper and plastic packaging

AXIA (1998)
Manufacturer and distributor of niche construction tools, formed wire products, and industrial equipment

Sterling Chemicals (1996/1986)
Producer of commodity petrochemicals and paper chemicals

Sterling Diagnostic Imaging (1996)
Global supplier of products and services for the capture, communication, display, and archiving of diagnostic images

Texas Petrochemical (1996)
Producer of petrochemicals including butadiene, butene-1, and MTBE

Mail-Well (1994)
Manufacturer of specialized conventional envelopes and related packaging products

Purina Mills (1993)
Manufacturer and marketer of animal nutrition products for cattle, hogs, horses, and zoo animals

Royster-Clark (1992)
Marketer of fertilizer materials, micronutrients, animal feeds, and other farm supplies to farmers and related entities

Arcadian Chemical (1989/1984)
Producer of nitrogen and phosphate agricultural fertilizers and industrial chemical products

Craftworld International (1989)
Wholesale distributor of craft supplies

CJC (1988)
Manufacturer and marketer of high-school rings and other personalized jewelry

Fiber Industries (1988)
Manufacturer and marketer of polyester textile fiber products and bottle resins

INDSPEC Chemical (1988)
Producer of resorcinol, a chemical used in the production of automotive tires, and other industrial chemicals

Kranco (1988)
Manufacturer of overhead cranes

Cain Chemical (1987)
Producer of ethylene and ethylene derivatives

Sirena (1987)
Manufacturer and distributor of branded swimwear and lightweight leisurewear

Airtron (1986)
Residential and light industrial heating and air-conditioning contractor

Knox Lumber (1986)
Distributor and retailer of lumber, hardware, and related building materials

A-1 Rental Car (1985)
Rental car franchise

Hawkeye Chemical (1985)
Producer of nitrogen fertilizer and other related products

Steffen Dairy (1985)

Processor of dairy foods

Pawnee Industries (1984)

Manufacturer of custom-extruded plastic sheet materials

Vista Chemical (1984)
Producer of commodity and specialty petrochemicals, including surfactants and PVC resins

Balco International (1983)

Manufacturer of specialty architectural products