| Business | Phone |
| Tom Vaughn Trustee 200 S Michigan Ave 1300, Chicago 60604 | (312) 294-5900 |
| Illinois Stock Transfer 209 W Jackson Blvd 903, Chicago 60606 | (312) 427-2953 |
| Regenstein Foundation 8600 W Bryn Mawr Ave 705n, Chicago 60631 | (312) 693-6464 |
| Spyglass Options Inc 2042 N Whipple St, Chicago 60647 | (773) 276-9788 |