Overview

Trostel is a manufacturer of custom seals, precision molded rubber products, and custom mixed rubber compounds, headquartered in Lake Geneva, Wisconsin, United States. The company was founded in 1858 and reports an employee band of 200 to 500 and an estimated revenue band of $100 to $250 million. It is privately held and serves the automotive, electric-vehicle, appliance, plumbing-hardware, and industrial equipment industries. Trostel is a member of the ParkOhio family, according to a December 2025 post from ParkOhio Holding Corp.

At a glance

What Trostel makes

Trostel holds IATF 16949, ISO 14001, ISO 9001, and ISO/TS 16949 certifications and produces custom rubber compounds, shaft seals, and precision molded seals.

Certifications

Trostel is associated with the following certifications in public sources. Confirm the certified scope for the specific plant producing your part:

• IATF 16949 — mfg.com

• ISO 14001 — processregister.com

• ISO 9001 — pr.com

• ISO/TS 16949 — processregister.com

Trade and customs footprint

No customs or trade shipment data is available for Trostel in the record. US customs bill-of-lading records list 18 inbound shipments across 9 foreign suppliers, with top origins including Israel · South Korea · China · Taiwan.

Latest developments

• 2026-10-06 — Trostel’s Greenbriar Has Fed West Des Moines for 40 Years – Hyperlocal Loop (hyperlocalloop.com)

• 2026-09-24 — Forrest Bush (linkedin.com)

• 2026-08-31 — Trostel Number of Employees 2026 | Employee Count & Headcount Data | Revelio Labs (reveliolabs.com)

• 2025-12-16 — 🔩 Trostel, a proud member of the ParkOhio family, is dedicated to producing high-performance rubber products that enhance the reliability and efficiency of our customers' applications. With a legacy of quality and … | ParkOhio Holding Corp. (linkedin.com)

• 2025-11-03 — 🌟 Welcome to the Team! 🌟 | Sears Trostel Lumber & Millwork (linkedin.com)

Facilities

Trostel is headquartered in Lake Geneva, Wisconsin. Public sources also reference these locations:

• Lake Geneva, Wisconsin — pr.com

Company details

The company is privately held, carries an estimated revenue band of $100 to $250 million, and employs between 200 and 500 people. Trostel was founded in 1858, has an estimated 200-500 employees, and is headquartered in Lake Geneva, Wisconsin. On the LightSource stability read it is rated "Established & active": 168 years in operation (founded 1858). Holds IATF 16949, ISO 14001, ISO 9001, ISO/TS 16949 certification(s) per public sources.

Frequently asked questions

What does Trostel make?

Trostel is a manufacturer of custom seals, precision molded rubber products, and custom mixed rubber compounds, headquartered in Lake Geneva, Wisconsin, United States. The company was founded in 1858 and reports an employee band of 200 to 500 and an estimated revenue band of $100 to $250 million. It is privately held and serves the automotive, electric-vehicle, appliance, plumbing-hardware, and industrial equipment industries. Trostel is a member of the ParkOhio family, according to a December 2025 post from ParkOhio Holding Corp.

Where is Trostel headquartered?

Trostel is headquartered in Lake Geneva, Wisconsin (901 Maxwell St, Lake Geneva, Wisconsin, 53147).

When was Trostel founded?

Trostel was founded in 1858.

How big is Trostel?

Trostel has an estimated 200-500 employees, with revenue in the $100-250M range (estimated).

What certifications does Trostel hold?

Trostel lists IATF 16949 · ISO 14001 · ISO 9001 · ISO/TS 16949 on its website. Confirm the certified scope for the specific plant producing your part.

Does Trostel import from overseas suppliers?

US customs bill-of-lading records show 18 inbound shipments for Trostel, with top origins including Israel · South Korea · China · Taiwan.

Related suppliers

Explore other suppliers in the LightSource directory:

• 20/20 Custom Molded Plastics, LLC

• 3C Metal

• 80/20

• A.J. Rose Manufacturing Co.

• A.L.P. Lighting Components

Last verified Nov 2026. Is this your company? Request a correction.