FILINGS
| AMPH 0001297184 | |||
|---|---|---|---|
| Filing Date | Form Type | Description | Document |
| 2023-03-17 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2023-03-10 | 8-K | 8-K | View Document |
| 2023-03-08 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2023-03-08 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2023-03-08 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2023-03-08 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2023-03-03 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2023-03-02 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2023-03-01 | S-8 | S-8 | View Document |
| 2023-03-01 | 10-K | 10-K | View Document |
| 2023-02-28 | 8-K | 8-K | View Document |
| 2023-02-24 | 8-K | 8-K | View Document |
| 2023-02-09 | SC 13G/A | SCHEDULE 13G/A | View Document |
| 2023-02-02 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2023-02-01 | SC 13G/A | View Document | |
| 2023-01-27 | SC 13G/A | SC 13G/A | View Document |
| 2023-01-26 | SC 13G/A | View Document | |
| 2023-01-20 | SC 13G/A | View Document | |
| 2023-01-04 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-12-02 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-11-18 | 8-K | 8-K | View Document |
| 2022-11-08 | 10-Q | 10-Q | View Document |
| 2022-11-07 | 8-K | 8-K | View Document |
| 2022-11-02 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-10-04 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-09-02 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-08-10 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-08-10 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-08-09 | 8-K | 8-K | View Document |
| 2022-08-09 | 10-Q | 10-Q | View Document |
| 2022-08-08 | 8-K | 8-K | View Document |
| 2022-08-02 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-07-19 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-07-18 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-07-12 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-07-08 | 8-K | 8-K | View Document |
| 2022-07-06 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-07-05 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-07-05 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-07-01 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-06-22 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-06-15 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-06-14 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-06-14 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-06-14 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-06-14 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-06-14 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-06-14 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-06-13 | 8-K | 8-K | View Document |
| 2022-06-07 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-06-06 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-06-02 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-05-25 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-05-23 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-05-20 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-05-20 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-05-19 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-05-18 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-05-17 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-05-10 | 10-Q | 10-Q | View Document |
| 2022-05-09 | 8-K | 8-K | View Document |
| 2022-05-03 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-04-22 | 8-K | 8-K | View Document |
| 2022-04-14 | DEFA14A | DEFA14A | View Document |
| 2022-04-14 | DEF 14A | DEF 14A | View Document |
| 2022-04-04 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-18 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-18 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-18 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-18 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-17 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-17 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-17 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-17 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-17 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-17 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-11 | S-8 | S-8 | View Document |
| 2022-03-11 | 10-K | 10-K | View Document |
| 2022-03-10 | 8-K | 8-K | View Document |
| 2022-03-09 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-01 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-01 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-03-01 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-02-14 | SC 13G/A | View Document | |
| 2022-02-11 | SC 13G/A | SC 13G/A | View Document |
| 2022-02-09 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-02-09 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-02-09 | SC 13G/A | SCHEDULE 13G/A | View Document |
| 2022-02-02 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-01-28 | SC 13G/A | View Document | |
| 2022-01-11 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-01-11 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-01-04 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2022-01-04 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2021-12-23 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2021-12-22 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2021-12-17 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2021-12-13 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2021-11-23 | 4 | OWNERSHIP DOCUMENT | View Document |
| 2021-11-19 | EFFECT | View Document | |
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