| Continental AG |
★★★★ |
| Robert Bosch Automotive Steering GmbH |
★★★★ |
| ZF Friedrichshafen AG |
★★★★ |
| Brose Fahrzeugteile GmbH & Co. KG |
★★★ |
| Elektrobit Automotive GmbH ★★★ |
★★★ |
| HELLA KGaA Hueck & Co. |
★★★ |
| Magna International (Germany) GmbH |
★★★ |
| MAHLE GmbH |
★★★ |
| Schaeffler Technologies AG & Co. KG |
★★★ |
| Faurecia Automotive GmbH |
★★ |
| Johnson Controls Systems & Service GmbH |
★★ |
| AVL Deutschland GmbH |
★ |
| BorgWarner Turbo Systems Worldwide Headquarters GmbH |
★ |
| ElringKlinger AG |
★ |
| IAV GmbH Ingenieurgesellschaft Auto und Verkehr |
★ |
| MANN+HUMMEL GMBH |
★ |
| Valeo Holding Deutschland GmbH |
★ |