What Stackpole International makes

Stackpole International is a powertrain-components supplier built around two core lines: automotive pumps and powder metal parts. On the pump side, the company describes itself as a leading black-box supplier of engine and transmission oil pumps in North America, producing precision gear and vane pumps, mechanical vacuum pumps, balance shaft modules, and electrically driven auxiliary pumps. It says it pioneered the variable displacement oil pump, a technology that trims parasitic losses to support lower-emission, higher-efficiency powertrains, and it has continued to lead that product's optimization and commercialization.

The powder metal side manufactures complex fabricated components: gears, sprockets, clutch components, and pump components, along with sub-assemblies such as synchronizer assemblies and assembled planetary gear carriers. The company points to a portfolio of patent-protected processes in raw-material formulation, net-shape complexity, and selective densification, drawing on metal forming, machining, powder metallurgy, and heat treatment. Its North American pump operations have reported shipping roughly four million pumps a year at a defect rate below 10 parts per million across product lines.

Stackpole serves the automotive market as a direct supplier to OEMs and their Tier 1 suppliers. Its engineering footprint spans a Europe Technical Center focused on variable displacement pump development and advanced product and process engineering across its plants.

Ownership and history

Stackpole International traces its roots to 1906, giving it more than a century as an automotive-components supplier. Before its current ownership it was privately held, most recently backed by private equity: a limited partnership majority owned by Crestview Partners.

In August 2015, Johnson Electric Holdings Limited agreed to acquire Stackpole in a transaction valued at about C$800 million (roughly US$605 to 608 million) on an enterprise-value basis, and the deal closed on October 27, 2015. Johnson Electric, a Hong Kong-listed global maker of electric motors and motion subsystems, folded Stackpole into its Automotive Products Group, where it remains a live brand for powder metal components and pumps. As of Johnson Electric's fiscal 2024 to 2025 reporting, the Automotive Products Group's product line still lists Stackpole among its offerings. The standalone stackpole.com website now redirects to johnsonelectric.com, reflecting that integration.

Locations

Stackpole operates a global footprint that the company and acquisition coverage describe as roughly nine to twelve manufacturing facilities and technical centers across North America, Europe, and Asia, plus Turkey. Its global headquarters is at 1325 Cormorant Road in Ancaster, Ontario, which also houses a Powder Metal Division, with an Engineered Products Division next door at 1310 Cormorant Road. Additional Canadian plants sit in Mississauga and Stratford, Ontario, with a US sales office in Auburn Hills, Michigan.

In Europe, the company centers its operations on a technical center in Aachen, Germany, home to its variable displacement pump research, alongside an Engineered Products site in Izmir, Turkey. In Asia, it runs an Engineered Products operation in Changzhou, China, and holds the Halla Stackpole joint venture with powder metal facilities in Beijing, China, and Ochang, Korea.

Financial performance

Stackpole does not publish standalone financials today; its results are consolidated into Johnson Electric's Automotive Products Group. At the time of the 2015 acquisition, the company's investor materials reported 2014 consolidated revenue of C$487 million, excluding its Korean-Chinese joint venture, and normalized EBITDA of C$82 million, with about 80 percent of consolidated sales made to North American customers. Those figures are historical and predate the acquisition.

At the parent level, Johnson Electric reported group revenue of roughly US$3.7 billion for the year ended March 2025, with quarterly Automotive Products Group revenue near US$765 million, the segment that carries the Stackpole brand.

Certifications and quality

Stackpole's Ancaster operation, under Johnson Electric Canada Ltd, holds IATF 16949 certification, the automotive-industry quality management standard, with a certificate hosted on the parent company's site referencing a 2024 cycle. IATF 16949 across multiple sites is the norm for direct automotive suppliers, and the company presents advanced product and process engineering as a standing function. As with most powertrain suppliers, treat multi-site certification as claimed until confirmed for a specific plant a program requires.

Known customers

Stackpole describes its customer base as blue-chip, comprised mainly of the world's leading automotive OEMs and their Tier 1 suppliers. The company has not published individually named OEM programs at a level of detail that meets our documentation bar, so this profile does not list specific customer names. Buyers evaluating Stackpole for a tooling or component program should request current program references and plant-level certification scope directly.

Frequently asked questions

What does Stackpole International make?

Stackpole International makes automotive powertrain components in two families: pumps and powder metal parts. Pumps include engine and transmission oil pumps, variable displacement oil pumps, mechanical vacuum pumps, balance shaft modules, and electric auxiliary pumps. Powder metal parts include gears, sprockets, clutch and pump components, and assemblies such as synchronizers and planetary gear carriers.

Who owns Stackpole International?

Stackpole International has been owned by Johnson Electric Holdings Limited, a Hong Kong-listed global motor and motion-systems maker, since October 27, 2015. Johnson Electric acquired it for about C$800 million (roughly US$605 to 608 million) from a private-equity owner and operates it as a brand within its Automotive Products Group.

Where is Stackpole International headquartered?

Stackpole International's global headquarters is at 1325 Cormorant Road in Ancaster, Ontario, Canada. It operates additional plants in Mississauga and Stratford, Ontario, a US sales office in Auburn Hills, Michigan, a technical center in Aachen, Germany, and operations in Izmir, Turkey, and Changzhou, China, plus the Halla Stackpole joint venture in Beijing, China, and Ochang, Korea.

How old is Stackpole International?

Stackpole International traces its history to 1906, making it more than 110 years old as an automotive-components supplier. At the 2015 acquisition it was described as having a 109-year history.

What certifications does Stackpole International hold?

Stackpole's Ancaster operation, under Johnson Electric Canada Ltd, holds IATF 16949 certification, the automotive quality management standard, with a certificate referencing a 2024 cycle posted on the parent company's site. IATF 16949 across multiple plants is standard for direct automotive suppliers.

Who are Stackpole International's customers?

Stackpole describes its customers as blue-chip automotive OEMs and their Tier 1 suppliers. The company does not publish individually named customer programs in enough detail to list here, so specific OEM names are omitted from this profile.

Last verified September 28, 2026. Is this your company? Request a correction.