| Employee plan annual report | 11-K | 2001-10-26 | 2001-10-25 |
| Prospectus supplement | 424B5 | 2001-09-27 | - |
| Quarterly report | 10-Q | 2001-08-10 | 2001-06-30 |
| Activist ownership stake (update) | SC 13D/A | 2001-08-09 | - |
| Activist ownership stake (update) | SC 13D/A | 2001-07-03 | - |
| Employee stock plan | S-8 | 2001-06-08 | - |
| Activist ownership stake | SC 13D | 2001-05-17 | - |
| Quarterly report | 10-Q | 2001-05-10 | 2001-03-31 |
| Securities registration | S-3 | 2001-05-01 | - |
| Proxy statement | DEF 14A | 2001-04-05 | 2001-05-15 |
| Annual report | 10-K | 2001-03-16 | 2000-12-31 |
| Activist ownership stake | SC 13D | 2000-12-21 | - |
| S-3/A | - | 2000-12-13 | - |
| Quarterly report | 10-Q | 2000-11-13 | 2000-09-30 |
| Employee plan annual report | 11-K | 2000-10-27 | 2000-04-30 |
| 424B3 | - | 2000-10-26 | - |
| 424B3 | - | 2000-10-24 | - |
| Activist ownership stake | SC 13D | 2000-09-22 | - |
| Activist ownership stake (update) | SC 13D/A | 2000-08-23 | - |
| Activist ownership stake (update) | SC 13D/A | 2000-08-16 | - |
| Quarterly report | 10-Q | 2000-08-10 | 2000-06-30 |
| Major company event | 8-K | 2000-08-08 | 2000-08-01 |
| Prospectus supplement | 424B5 | 2000-08-03 | - |
| 424B3 | - | 2000-07-31 | - |
| Quarterly report | 10-Q | 2000-05-12 | 2000-03-31 |
| DEFR14A | - | 2000-04-12 | - |
| Proxy statement | DEF 14A | 2000-04-11 | 2000-05-18 |
| 10-K405 | - | 2000-03-28 | 1999-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2000-02-10 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-09 | - |
| 424B3 | - | 1999-12-07 | - |
| Quarterly report | 10-Q | 1999-11-15 | 1999-09-30 |
| Employee plan annual report | 11-K | 1999-10-27 | 1999-04-30 |
| 424B3 | - | 1999-10-20 | - |
| Activist ownership stake (update) | SC 13D/A | 1999-09-24 | - |
| Employee stock plan | S-8 | 1999-08-20 | - |
| Quarterly report | 10-Q | 1999-08-16 | 1999-06-30 |
| S-3/A | - | 1999-05-19 | - |
| Quarterly report | 10-Q | 1999-05-17 | 1991-03-31 |
| Major company event | 8-K | 1999-05-13 | 1999-04-28 |
| Passive ownership stake | SC 13G | 1999-05-05 | - |
| S-3/A | - | 1999-04-30 | - |
| Securities registration | S-3 | 1999-04-29 | - |
| Proxy statement | DEF 14A | 1999-04-12 | 1999-05-20 |
| PRE 14A | - | 1999-04-02 | 1999-05-20 |
| 10-K405 | - | 1999-03-30 | 1998-12-31 |
| Major company event | 8-K | 1999-03-26 | 1998-11-12 |
| S-3DPOS | - | 1999-03-09 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-11 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-10 | - |
