AMPHASTAR PHARMACEUTICALS IN (AMPH) Stock Ownership

NASDAQ:AMPH • US03209R1032

Current stock price

19.53 USD
+0.12 (+0.62%)
Last:

AMPH Ownership information

AMPH Ownership Chart.AMPH Ownership Chart: showing Insider, Institutional ownership and shares available to the public.AMPH Ownership.InsiderInstitutionalPublic



Shares Outstanding45.37M
Float34.12M
Float Short Interest Percentage10.72%
Owners (insider)9.5%
Owners (institutional)76.52%
Owners (insider) change4.03%
Owners (institutional) change-0.32%
AMPH Institutional Ownership HistoryAMPH Institutional Ownership HistoryAMPH Institutional Ownership History Sep 2021 Mar 2022 Sep 2022 Mar 2023 Sep 2023 Mar 2024 Sep 2024 Mar 2025 Sep 2025 10M 20M 30M
AMPH Historical Insider Transactions ChartAMPH Historical Insider Buy and Sell Transactions ChartAMPH Historical Insider Transactions Apr 2025 May 2025 Jun 2025 Jul 2025 Aug 2025 Sep 2025 Oct 2025 Nov 2025 Dec 2025 Jan 2026 Feb 2026 Mar 2026 0 100K 200K 300K 400K 500K
Date Name Type Shares Price Amount
Mar 10, 2026 Zhang Jack Y. Option Excercise 19180 18.91 $ 362,693.80
Mar 10, 2026 Luo Mary Z. Option Excercise 19180 18.91 $ 362,693.80
Mar 10, 2026 Liawatidewi Yakob Option Excercise 1870 18.91 $ 35,361.70
Mar 10, 2026 Zhou Rong Option Excercise 2215 18.91 $ 41,885.65
Mar 10, 2026 PETERS WILLIAM J Option Excercise 3297 18.91 $ 62,346.27
Mar 9, 2026 Liawatidewi Yakob Grant 35450 0.00 $ 0.00
Mar 9, 2026 Zhou Rong Grant 39432 0.00 $ 0.00
Mar 9, 2026 PETERS WILLIAM J Grant 58693 0.00 $ 0.00
Mar 9, 2026 Zhang Jack Y. Grant 252966 0.00 $ 0.00
Mar 9, 2026 Luo Mary Z. Grant 252966 0.00 $ 0.00
Mar 6, 2026 Liawatidewi Yakob Option Excercise 1144 19.34 $ 22,124.96
Mar 6, 2026 Zhou Rong Option Excercise 1357 19.34 $ 26,244.38
Mar 6, 2026 Zhang Jack Y. Option Excercise 10850 19.34 $ 209,839.00
Mar 6, 2026 Luo Mary Z. Option Excercise 10850 19.34 $ 209,839.00
Mar 6, 2026 PETERS WILLIAM J Option Excercise 2146 19.34 $ 41,503.64
Mar 4, 2026 Zhou Rong Option Excercise 1124 19.96 $ 22,435.04
Mar 4, 2026 Liawatidewi Yakob Option Excercise 965 19.96 $ 19,261.40
Mar 4, 2026 PETERS WILLIAM J Option Excercise 1744 19.96 $ 34,810.24
Mar 4, 2026 Zhang Jack Y. Option Excercise 8201 19.96 $ 163,691.96
Mar 4, 2026 Luo Mary Z. Option Excercise 8201 19.96 $ 163,691.96
Dec 17, 2025 Zhou Rong Option Excercise 9787 11.33 $ 110,886.71
Dec 17, 2025 Zhou Rong Open Market Sale 9787 26.20 $ 256,379.27
Dec 11, 2025 Petersen Floyd F. Open Market Sale 4163 25.82 $ 107,508.28
Nov 25, 2025 PRINS RICHARD K Option Excercise 4179 16.69 $ 69,747.51
Nov 25, 2025 PRINS RICHARD K Open Market Sale 4179 27.10 $ 113,253.41
Nov 13, 2025 Petersen Floyd F. Option Excercise 16679 16.69 $ 278,372.51
Nov 13, 2025 Petersen Floyd F. Open Market Sale 16679 26.49 $ 441,836.72
Nov 3, 2025 Petersen Floyd F. Open Market Sale 500 25.27 $ 12,633.10
Oct 1, 2025 Petersen Floyd F. Open Market Sale 500 27.20 $ 13,602.40
Sep 2, 2025 Petersen Floyd F. Open Market Sale 500 30.98 $ 15,491.65
Aug 1, 2025 Petersen Floyd F. Open Market Sale 500 20.83 $ 10,415.75
Jul 18, 2025 Gaugh David Russell Grant 6304 0.00 $ 0.00
Jul 2, 2025 Petersen Floyd F. Open Market Sale 500 23.47 $ 11,733.95
Jun 13, 2025 Zhang Jack Y. Option Excercise 200000 13.03 $ 2,606,000.00
Jun 13, 2025 Luo Mary Z. Option Excercise 200000 13.03 $ 2,606,000.00
Jun 3, 2025 Lee Howard Option Excercise 923 26.01 $ 24,007.23
Jun 2, 2025 Gerst Diane G. Grant 5122 0.00 $ 0.00
Jun 2, 2025 Deflin Gayle Grant 5122 0.00 $ 0.00
Jun 2, 2025 Lee Howard Grant 5122 0.00 $ 0.00
May 19, 2025 PETERS WILLIAM J Option Excercise 273 24.79 $ 6,767.67
May 1, 2025 Petersen Floyd F. Open Market Sale 500 24.08 $ 12,041.45