NASDAQ : AMPH
$0.06 (0.3%)
2.84%
54
change: -162.0 | last: 21621
change: -79.0 | last: 10018
change: -74.0 | last: 9210
change: -20.0 | last: 30170
change: 118.0 | last: 52-
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0.00
change: 0.0 | last: 025.97M
| Filing Date | Reporting Person | Amount Beneficially Owned | % of Class |
|---|---|---|---|
| 2026-07-14 | Dimensional Fund Advisors LP | 2.31M | 5.20% |
| 2026-03-26 | The Vanguard Group | - | 0.00% |
| 2025-10-17 | BlackRock, Inc. | 5.33M | 11.50% |
| 2025-02-07 | Jack Y. Zhang | 12.52M | 24.80% |
| 2022-02-14 | Consonance Capman GP LLC | - | 0.00% |
| 2022-02-14 | Rhodora J. Donahue | 3.46M | 7.24% |
| 2022-02-14 | Thomas R. Donahue | 3.46M | 7.24% |
| 2022-02-14 | Mitchell Blutt | - | 0.00% |
| 2022-02-14 | Federated Hermes, Inc. | 3.46M | 7.24% |
| 2022-02-14 | Voting Shares Irrevocable Trust | 3.46M | 7.24% |
| 2022-02-14 | Consonance Capital Management LP | - | 0.00% |
| 2022-02-14 | J. Christopher Donahue | 3.46M | 7.24% |
| 2022-02-11 | Applied Physics & Chemistry Laboratories, Inc. | 6.83M | 14.30% |
| 2022-02-11 | Jack Yongfeng Zhang | 12.83M | 25.50% |
| 2022-02-11 | Mary Ziping Luo | 12.83M | 25.50% |
| 2022-02-09 | The Vanguard Group - 23-1945930 | 2.47M | 5.16% |
| 2022-01-28 | (1) BlackRock, Inc. | 7.16M | 15.00% |
| 2021-02-17 | Mitchell Blutt | 7.58M | 6.11% |
| 2021-02-17 | Consonance Capital Management LP | 5.4M | 4.36% |
| 2021-02-17 | Consonance Capital Opportunity Fund Management LP | 2.18M | 1.75% |
| 2021-02-17 | Consonance Capman GP LLC | 7.58M | 6.11% |
| 2021-02-16 | Consonance Capital Management LP | 5.4M | 4.36% |
| 2021-02-16 | Consonance Capital Opportunity Fund Management LP | 1.19M | 2.04% |
| 2021-02-16 | Mitchell Blutt | 6.06M | 9.99% |
| 2021-02-16 | Consonance Capman GP LLC | 6.06M | 9.99% |
| 2021-02-12 | Applied Physics & Chemistry Laboratories, Inc. | 7.03M | 14.80% |
| 2021-02-12 | Voting Shares Irrevocable Trust | 3.23M | 6.79% |
| 2021-02-12 | J. Christopher Donahue | 3.23M | 6.79% |
| 2021-02-12 | Jack Yongfeng Zhang | 12.49M | 25.20% |
| 2021-02-12 | Mary Ziping Luo | 12.49M | 25.20% |
| 2021-02-12 | Thomas R. Donahue | 3.23M | 6.79% |
| 2021-02-12 | Rhodora J. Donahue | 3.23M | 6.79% |
| 2021-02-12 | Federated Hermes, Inc. | 3.23M | 6.79% |
| 2021-02-10 | The Vanguard Group - 23-1945930 | 2.48M | 5.22% |
| 2021-01-26 | (1) BlackRock, Inc. | 7.14M | 15.00% |
| 2020-02-14 | 33-4234397 | 7.03M | 15.00% |
| 2020-02-14 | Mary Ziping Luo | 13M | 26.20% |
| 2020-02-14 | Jack Yongfeng Zhang | 13M | 26.20% |
| 2020-02-11 | The Vanguard Group - 23-1945930 | 2.36M | 5.03% |
| 2020-02-04 | (1) BlackRock, Inc. | 6.13M | 13.10% |
| 2019-02-13 | Jack Yongfeng Zhang | 13.35M | 27.30% |
| 2019-02-13 | 33-4234397 | 7.33M | 15.90% |
| 2019-02-13 | Mary Ziping Luo | 13.35M | 27.30% |
| 2019-01-24 | (1) BlackRock, Inc. | 5.93M | 12.90% |
| 2018-02-09 | Jack Yongfeng Zhang | 12.87M | 26.70% |
| 2018-02-09 | Mary Ziping Luo | 12.87M | 26.70% |
| 2018-02-09 | Applied Physics & Chemistry Laboratories, Inc. | 7.46M | 16.20% |
| 2018-01-19 | (1) BlackRock, Inc. | 5.51M | 12.00% |
| 2017-02-13 | Mary Ziping Luo | 12.89M | 25.90% |
| 2017-02-13 | Jack Yongfeng Zhang | 12.89M | 25.90% |
| 2017-01-09 | (1) BlackRock, Inc. | 5.09M | 11.00% |
| 2015-02-17 | Broadfin Capital, LLC | 2.13M | 4.80% |
| 2015-02-17 | Kevin Kotler | 2.13M | 4.80% |
| 2015-02-17 | Broadfin Healthcare Master Fund, Ltd. | 2.13M | 4.80% |
| 2015-02-12 | Jack Yongfeng Zhang | 11.12M | 24.91% |
| 2014-07-03 | Broadfin Healthcare Master Fund, Ltd. | 2.18M | 5.01% |
| 2014-07-03 | Broadfin Capital, LLC | 2.18M | 5.01% |
| 2014-07-03 | Kevin Kotler | 2.18M | 5.01% |
| 2014-06-30 | Deerfield Management Company, L.P. | 1.83M | 4.22% |
| 2014-06-30 | Deerfield Mgmt, L.P. | 1.83M | 4.22% |
| 2014-06-30 | Deerfield Special Situations International Master Fund, L.P. | 813.31K | 1.87% |
| 2014-06-30 | James E. Flynn | 1.83M | 4.22% |
| 2014-06-30 | Deerfield Special Situations Fund, L.P. | 1.02M | 2.35% |
| 2013-03-06 | Sabby Healthcare Volatility Master Fund, Ltd. | 1.67M | 6.17% |
| Date | Stock Price | Shares Outstanding | Market Cap | Cash & Equivalents | Total Debt | Enterprise Value |
|---|---|---|---|---|---|---|
| 2025-12-31 | $26.78 | 46.74M | $1.25B | $170.18M | $656M | $1.74B |
| 2024-12-31 | $37.13 | 48.43M | $1.8B | $151.61M | $650.55M | $2.3B |
| 2023-12-31 | $61.85 | 48.26M | $2.99B | $144.3M | $623.64M | $3.46B |
| 2022-12-31 | $28.02 | 48.55M | $1.36B | $156.1M | $102.58M | $1.31B |
| 2021-12-31 | $23.29 | 47.78M | $1.11B | $126.35M | $104.66M | $1.09B |
| 2020-12-31 | $20.11 | 47.04M | $945.93M | $92.64M | $67.27M | $920.56M |
| 2019-12-31 | $19.29 | 46.98M | $906.28M | $75.55M | $66.62M | $897.36M |
| 2018-12-31 | $19.90 | 46.4M | $923.26M | $86.34M | $50.21M | $887.14M |
| 2017-12-31 | $19.24 | 46.11M | $887.1M | $65.59M | $47.16M | $868.66M |
| 2016-12-31 | $18.42 | 45.38M | $835.81M | $72.35M | $37.72M | $801.18M |
| Date | Stock Price | Shares Outstanding | Market Cap | Cash & Equivalents | Total Debt | Enterprise Value |
|---|---|---|---|---|---|---|
| 2026-03-31 | $19.59 | 45.32M | $887.86M | $171.17M | $686.38M | $1.4B |
| 2025-12-31 | $26.78 | 45.91M | $1.23B | $170.18M | $656M | $1.72B |
| 2025-09-30 | $26.65 | 46.47M | $1.24B | $216.5M | $656.77M | $1.68B |
| 2025-06-30 | $22.96 | 46.95M | $1.08B | $187.69M | $655.5M | $1.55B |
| 2025-03-31 | $28.99 | 47.64M | $1.38B | $182.78M | $652.53M | $1.85B |
| 2024-12-31 | $37.13 | 48.43M | $1.8B | $151.61M | $650.55M | $2.3B |
| 2024-09-30 | $48.53 | 48.62M | $2.36B | $192.12M | $629.85M | $2.8B |
| 2024-06-30 | $38.51 | 48.91M | $1.88B | $189.62M | $620.58M | $2.31B |
| 2024-03-31 | $43.44 | 48.21M | $2.09B | $201.15M | $627.12M | $2.52B |
| 2023-12-31 | $61.85 | 47.96M | $2.97B | $144.3M | $623.64M | $3.45B |
| 2023-09-30 | $45.99 | 48.7M | $2.24B | $266.78M | $672.56M | $2.65B |
| 2023-06-30 | $57.47 | 48.4M | $2.78B | $151.28M | $528.74M | $3.16B |