| Allison Engine Company | business | 1915 |
| ATA Airlines | airline | 1973 |
| Chautauqua Airlines | airline | 1973 |
| Indiana University – Purdue University Indianapolis | public educational institution of the United States, university, open-access publisher | 1969 |
| Marmon Motor Car Company | business, automobile manufacturer | 1902 |
| Steak 'n Shake | restaurant chain, business, enterprise | 1934 |