| Passive ownership stake (update) | SC 13G/A | 2001-09-21 | - |
| Quarterly report | 10-Q | 2001-08-10 | 2001-06-30 |
| Proxy statement | DEF 14A | 2001-07-09 | 2001-08-17 |
| Major company event | 8-K | 2001-06-07 | 2001-06-06 |
| Major company event | 8-K | 2001-05-22 | 2001-05-16 |
| 10-K405 | - | 2001-05-15 | 2001-03-31 |
| Quarterly report | 10-Q | 2001-02-14 | 2000-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2001-02-14 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-02-12 | - |
| Passive ownership stake | SC 13G | 2001-02-09 | - |
| POS AM | - | 2001-02-01 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-02-01 | - |
| Employee stock plan | S-8 | 2001-01-18 | - |
| Major company event | 8-K | 2001-01-17 | 2001-01-16 |
| Passive ownership stake (update) | SC 13G/A | 2001-01-10 | - |
| S-4/A | - | 2000-12-06 | - |
| Employee stock plan | S-8 | 2000-12-06 | - |
| S-4 | - | 2000-11-20 | - |
| Quarterly report | 10-Q | 2000-11-14 | 2000-09-30 |
| Passive ownership stake (update) | SC 13G/A | 2000-11-13 | - |
| Activist ownership stake | SC 13D | 2000-11-03 | - |
| 425 | - | 2000-10-31 | - |
| Major company event | 8-K | 2000-10-30 | 2000-10-26 |
| 425 | - | 2000-10-27 | - |
| Quarterly report | 10-Q | 2000-08-07 | 2000-06-30 |
| Major company event | 8-K | 2000-07-26 | 2000-07-26 |
| Proxy statement | DEF 14A | 2000-07-07 | 2000-08-18 |
| Passive ownership stake (update) | SC 13G/A | 2000-06-09 | - |
| Annual report | 10-K | 2000-06-07 | 2000-03-31 |
| PRE 14A | - | 2000-05-26 | 2000-08-18 |
| 424B4 | - | 2000-03-24 | - |
| S-3/A | - | 2000-03-22 | - |
| Passive ownership stake | SC 13G | 2000-02-14 | - |
| Quarterly report | 10-Q | 2000-02-11 | 1999-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2000-02-10 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-04 | - |
| Major company event | 8-K | 2000-01-14 | 2000-01-14 |
| Passive ownership stake (update) | SC 13G/A | 2000-01-10 | - |
| Employee stock plan | S-8 | 1999-12-23 | - |
| Securities registration | S-3 | 1999-12-08 | - |
| Quarterly report | 10-Q | 1999-11-09 | 1999-09-30 |
| 8-A12G/A | - | 1999-10-12 | - |
| Major company event | 8-K | 1999-10-12 | 1999-10-11 |
| Quarterly report | 10-Q | 1999-08-03 | 1999-06-30 |
| Proxy statement | DEF 14A | 1999-07-06 | 1999-08-20 |
| Passive ownership stake (update) | SC 13G/A | 1999-06-11 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-06-10 | - |
| 10-K405 | - | 1999-05-18 | 1999-03-31 |
| Passive ownership stake (update) | SC 13G/A | 1999-03-10 | - |
| Quarterly report | 10-Q | 1999-02-12 | 1998-12-31 |
