Amphastar Pharmaceuticals, Inc. (AMPH)

Latest Insider Confidence Score

2026Q1

46.5
Bearish

Company insider confidence (by quarter)

2014Q2 2026Q1

Largest shareholders

Insider Role (last 12 mo) Shares held Filed at
Applied Physics & Chemistry Laboratories, Inc. 10% Owner 7,327,679 Dec 13, 2018
Zhang Jack Y. CEO 936,955 Feb 3, 2016
Luo Mary Z. COO 936,955 Feb 3, 2016
Koo Richard Director 219,822 Jun 24, 2014
Shandell Jason B. President 150,958 Mar 18, 2020

Recent buy/sell transactions

Exec date Filing date Insider Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Mar 4, 2026 Mar 6, 2026 Zhang Jack Y. CEO Sell 40.0 -8,201 -0.20% ✗ $163.7K
Mar 4, 2026 Mar 6, 2026 Zhou Rong SENIOR EVP, PRODUCTION CENTER Sell 43.8 -1,124 -0.46% ✗ $22.4K
Mar 4, 2026 Mar 6, 2026 Liawatidewi Yakob EVP CORP ADMIN CENTER Sell 26.3 -965 -1.03% ✗ $19.3K
Mar 4, 2026 Mar 6, 2026 PETERS WILLIAM J CFO Sell 26.3 -1,744 -1.39% ✗ $34.8K
Dec 17, 2025 Dec 18, 2025 Zhou Rong SENIOR EVP, PRODUCTION CENTER Sell 20.0 -9,787 -3.88% ✗ $256.4K
Dec 11, 2025 Dec 15, 2025 Petersen Floyd F. Director Sell 22.5 -4,163 -5.51% ✗ $107.5K
Nov 25, 2025 Nov 25, 2025 PRINS RICHARD K Director Sell 22.5 -4,179 -10.62% ✗ $113.3K
Nov 13, 2025 Nov 17, 2025 Petersen Floyd F. Director Sell 20.0 -16,679 -18.09% ✗ $441.8K
Nov 3, 2025 Nov 5, 2025 Petersen Floyd F. Director Sell 51.3 -500 -0.66% ✓ $12.6K
Oct 1, 2025 Oct 2, 2025 Petersen Floyd F. Director Sell 51.3 -500 -0.65% ✓ $13.6K
Sep 2, 2025 Sep 3, 2025 Petersen Floyd F. Director Sell 51.3 -500 -0.65% ✓ $15.5K
Aug 1, 2025 Aug 4, 2025 Petersen Floyd F. Director Sell 51.3 -500 -0.64% ✓ $10.4K
Jul 18, 2025 Jul 22, 2025 Gaugh David Russell Director Neutral 90.0 +6,304 100.00% ✗ -
Jul 22, 2025 Gaugh David Russell Director Neutral 52.5 - 0.00% ✗ -
Jul 2, 2025 Jul 3, 2025 Petersen Floyd F. Director Sell 51.3 -500 -0.64% ✓ $11.7K
Jun 13, 2025 Jun 16, 2025 Zhang Jack Y. CEO Neutral 52.5 - 0.00% ✗ -
Jun 2, 2025 Jun 4, 2025 Lee Howard Director Sell 83.8 +4,199 2.84% ✗ $24K
Jun 2, 2025 Jun 4, 2025 Deflin Gayle Director Neutral 90.0 +5,122 88.43% ✗ -
Jun 2, 2025 Jun 4, 2025 Gerst Diane G. Director Neutral 90.0 +5,122 27.49% ✗ -
Jun 2, 2025 Jun 4, 2025 PRINS RICHARD K Director Neutral 90.0 +5,122 17.04% ✗ -
Jun 2, 2025 Jun 4, 2025 Petersen Floyd F. Director Sell 86.3 +4,622 6.30% ✓ $12.8K
Jun 2, 2025 Jun 4, 2025 ZASLOFF MICHAEL A Director Neutral 90.0 +5,122 20.99% ✗ -
May 19, 2025 May 20, 2025 PETERS WILLIAM J CFO Sell 45.0 -273 -0.22% ✗ $6.8K
May 1, 2025 May 2, 2025 Petersen Floyd F. Director Sell 51.3 -500 -0.68% ✓ $12K
Apr 1, 2025 Apr 2, 2025 Petersen Floyd F. Director Sell 51.3 -500 -0.67% ✓ $14.2K
Mar 15, 2025 Mar 18, 2025 Zhou Rong SENIOR EVP, PRODUCTION CENTER Sell 32.5 -3,189 -0.83% ✗ $87K
Mar 14, 2025 Mar 18, 2025 Zhang Jack Y. CEO Sell 35.0 -426,195 -10.01% ✗ $11.4M
Mar 15, 2025 Mar 18, 2025 Liawatidewi Yakob EVP CORP ADMIN CENTER Sell 22.5 -2,762 -2.87% ✗ $75.4K
Mar 15, 2025 Mar 18, 2025 PETERS WILLIAM J CFO Sell 22.5 -4,972 -3.82% ✗ $135.6K
Mar 10, 2025 Mar 12, 2025 Zhou Rong SENIOR EVP, PRODUCTION CENTER Neutral 90.0 +24,692 11.19% ✗ -
Mar 10, 2025 Mar 12, 2025 Liawatidewi Yakob EVP CORP ADMIN CENTER Neutral 90.0 +20,837 27.67% ✗ -
Mar 10, 2025 Mar 12, 2025 PETERS WILLIAM J CFO Neutral 90.0 +36,747 39.31% ✗ -
Mar 10, 2025 Mar 12, 2025 Zhang Jack Y. CEO Neutral 82.5 +165,222 4.60% ✗ -
Mar 6, 2025 Mar 10, 2025 Zhou Rong SENIOR EVP, PRODUCTION CENTER Sell 36.3 -1,354 -0.61% ✗ $38.3K
Mar 6, 2025 Mar 10, 2025 PETERS WILLIAM J CFO Sell 22.5 -2,141 -2.24% ✗ $60.6K
Mar 6, 2025 Mar 10, 2025 Liawatidewi Yakob EVP CORP ADMIN CENTER Sell 26.3 -1,141 -1.49% ✗ $32.3K
Mar 6, 2025 Mar 10, 2025 Zhang Jack Y. CEO Sell 37.5 -12,714 -0.35% ✗ $360.1K
Mar 6, 2025 Mar 7, 2025 Petersen Floyd F. Director Sell 48.8 -1,000 -1.33% ✓ $28K
Mar 4, 2025 Mar 6, 2025 PETERS WILLIAM J CFO Sell 32.5 -5,970 -5.88% ✓ $164.5K
Mar 4, 2025 Mar 6, 2025 Zhou Rong SENIOR EVP, PRODUCTION CENTER Sell 36.3 -1,121 -0.50% ✗ $31K
Mar 4, 2025 Mar 6, 2025 Liawatidewi Yakob EVP CORP ADMIN CENTER Sell 26.3 -963 -1.24% ✗ $26.6K
Mar 4, 2025 Mar 6, 2025 Zhang Jack Y. CEO Sell 40.0 -8,179 -0.23% ✗ $225.9K
Dec 12, 2024 Dec 16, 2024 Zhou Rong SENIOR EVP, PRODUCTION CENTER Sell 20.0 -15,000 -4.21% ✗ $672.8K
Dec 9, 2024 Dec 11, 2024 PRINS RICHARD K Director Sell 20.0 -10,410 -25.72% ✗ $437.7K
Nov 12, 2024 Nov 13, 2024 Zhou Rong SENIOR EVP, PRODUCTION CENTER Sell 20.0 -6,893 -3.00% ✗ $336.9K
Nov 12, 2024 Nov 13, 2024 PRINS RICHARD K Director Sell 22.5 -6,000 -16.45% ✗ $244K
Nov 11, 2024 Nov 12, 2024 Zhang Jack Y. CEO Neutral 27.5 -250,000 -6.47% ✗ -
Nov 6, 2024 Nov 8, 2024 Liawatidewi Yakob EVP CORP ADMIN CENTER Sell 30.0 -5,214 -6.31% ✓ $271.4K
Nov 6, 2024 Nov 8, 2024 PETERS WILLIAM J CFO Sell 30.0 -7,426 -7.31% ✓ $386.5K
Sep 13, 2024 Sep 17, 2024 Zhou Rong SENIOR EVP, PRODUCTION CENTER Sell 22.5 -3,000 -1.33% ✗ $144.8K
Sep 13, 2024 Sep 16, 2024 Zhang Jack Y. CEO Neutral 52.5 - 0.00% ✗ -
Sep 5, 2024 Sep 6, 2024 Petersen Floyd F. Director Sell 22.5 -3,000 -3.83% ✗ $139.4K
Aug 26, 2024 Aug 27, 2024 Zhou Rong SENIOR EVP, PRODUCTION CENTER Sell 22.5 -4,000 -1.76% ✗ $193.4K
Aug 12, 2024 Aug 13, 2024 PRINS RICHARD K Director Sell 20.0 -17,101 -33.48% ✗ $736.6K
Jul 31, 2024 Aug 2, 2024 PETERS WILLIAM J CFO Sell 26.3 -10,282 -9.85% ✓ $454.8K
Jun 27, 2024 Jun 28, 2024 PETERS WILLIAM J CFO Sell 37.5 -3,596 -3.68% ✓ $147.2K
Jun 10, 2024 Jun 11, 2024 Zhang Jack Y. CEO Neutral 52.5 - 0.00% ✗ -
Jun 10, 2024 Jun 11, 2024 Petersen Floyd F. Director Sell 22.5 -3,000 -3.69% ✗ $124.2K
Jun 3, 2024 Jun 5, 2024 Lee Howard Director Sell 78.8 +2,497 1.72% ✗ $24.3K
Jun 3, 2024 Jun 5, 2024 Gerst Diane G. Director Neutral 90.0 +3,076 19.77% ✗ -
Jun 3, 2024 Jun 5, 2024 Deflin Gayle Director Neutral 90.0 +3,076 113.25% ✗ -
Jun 3, 2024 Jun 5, 2024 Petersen Floyd F. Director Sell 83.8 +2,576 3.27% ✓ $21.3K
Jun 4, 2024 Jun 5, 2024 Liawatidewi Yakob EVP CORP ADMIN CENTER Sell 43.8 -272 -0.35% ✗ $11.5K
Jun 3, 2024 Jun 5, 2024 PRINS RICHARD K Director Neutral 85.0 +3,076 9.96% ✗ -
Jun 3, 2024 Jun 5, 2024 ZASLOFF MICHAEL A Director Neutral 90.0 +3,076 14.42% ✗ -
May 19, 2024 May 21, 2024 PETERS WILLIAM J CFO Sell 43.8 -387 -0.40% ✗ $16.8K
May 1, 2024 May 2, 2024 Petersen Floyd F. Director Sell 51.3 -500 -0.63% ✓ $20.8K
Apr 1, 2024 Apr 2, 2024 Petersen Floyd F. Director Sell 51.3 -500 -0.63% ✓ $21.7K
Mar 15, 2024 Mar 19, 2024 Zhang Jack Y. CEO Sell 35.0 -634,199 -14.76% ✗ $27.3M
Mar 15, 2024 Mar 19, 2024 Liawatidewi Yakob EVP CORP ADMIN CENTER Sell 22.5 -4,424 -5.42% ✗ $190.5K
Mar 15, 2024 Mar 19, 2024 Zhou Rong SENIOR EVP, PRODUCTION CENTER Sell 22.5 -5,535 -1.59% ✗ $238.3K
Mar 15, 2024 Mar 19, 2024 PETERS WILLIAM J CFO Sell 20.0 -11,645 -10.65% ✗ $501.3K
Mar 6, 2024 Mar 8, 2024 PETERS WILLIAM J CFO Sell 17.5 -20,326 -15.68% ✓ $944.3K
Mar 6, 2024 Mar 8, 2024 Liawatidewi Yakob EVP CORP ADMIN CENTER Sell 22.5 -1,221 -1.47% ✗ $56.5K
Mar 6, 2024 Mar 8, 2024 Zhou Rong SENIOR EVP, PRODUCTION CENTER Sell 32.5 -1,390 -0.61% ✗ $64.4K
Mar 6, 2024 Mar 8, 2024 Zhang Jack Y. CEO Sell 37.5 -10,021 -0.31% ✗ $464.1K
Mar 4, 2024 Mar 6, 2024 Zhang Jack Y. CEO Neutral 82.5 +91,420 2.87% ✗ -
Mar 5, 2024 Mar 6, 2024 ZASLOFF MICHAEL A Director Sell 20.0 -12,500 -36.95% ✗ $589.7K
Mar 4, 2024 Mar 6, 2024 Liawatidewi Yakob EVP CORP ADMIN CENTER Neutral 90.0 +10,754 14.91% ✗ -
Mar 4, 2024 Mar 6, 2024 Zhou Rong SENIOR EVP, PRODUCTION CENTER Neutral 85.0 +12,521 5.77% ✗ -
Mar 4, 2024 Mar 6, 2024 PETERS WILLIAM J CFO Neutral 90.0 +19,440 19.18% ✗ -
Mar 1, 2024 Mar 4, 2024 Petersen Floyd F. Director Sell 51.3 -500 -0.62% ✓ $22.8K
Feb 1, 2024 Feb 2, 2024 Petersen Floyd F. Director Sell 51.3 -500 -0.62% ✓ $26.5K
Jan 10, 2024 Jan 11, 2024 Luo Mary Z. COO Sell 38.8 -131,386 -1.29% ✓ $7.2M
Jan 8, 2024 Jan 10, 2024 Luo Mary Z. COO Sell 33.8 -219,800 -2.12% ✓ $12.8M
Jan 2, 2024 Jan 3, 2024 Petersen Floyd F. Director Sell 51.3 -500 -0.61% ✓ $30.7K
Dec 1, 2023 Dec 5, 2023 Zhou Rong Senior EVP, Production Center Sell 20.0 -7,830 -2.32% ✗ $462.2K
Dec 1, 2023 Dec 4, 2023 Petersen Floyd F. Director Sell 51.3 -500 -0.61% ✓ $29K
Nov 17, 2023 Nov 20, 2023 PRINS RICHARD K Director Sell 22.5 -5,000 -13.93% ✗ $223.4K
Nov 14, 2023 Nov 16, 2023 PETERS WILLIAM J CFO Sell 5.0 -59,250 -36.89% ✓ $3.3M
Nov 13, 2023 Nov 15, 2023 PRINS RICHARD K Director Sell 20.0 -5,000 -12.23% ✗ $262.5K
Nov 14, 2023 Nov 15, 2023 Deflin Gayle Director Sell 22.5 -4,163 -60.52% ✗ $230.8K
Nov 1, 2023 Nov 2, 2023 Petersen Floyd F. Director Sell 51.3 -500 -0.61% ✓ $22.7K
Oct 2, 2023 Oct 3, 2023 Petersen Floyd F. Director Sell 51.3 -500 -0.60% ✓ $22.9K
Sep 6, 2023 Sep 8, 2023 PETERS WILLIAM J CFO Sell 5.0 -60,743 -37.47% ✓ $3.1M
Aug 28, 2023 Aug 29, 2023 Liawatidewi Yakob EVP Corp Admin Center Sell 5.0 -28,816 -28.55% ✓ $1.5M
Aug 18, 2023 Aug 21, 2023 PRINS RICHARD K Director Sell 22.5 -2,000 -4.66% ✗ $105K
Aug 15, 2023 Aug 16, 2023 ZASLOFF MICHAEL A Director Sell 20.0 -12,759 -27.39% ✗ $730K
Aug 15, 2023 Aug 16, 2023 PRINS RICHARD K Director Sell 22.5 -4,163 -8.85% ✗ $238.9K
Jun 20, 2023 Jun 21, 2023 Zhou Rong EVP, Production Center Neutral 52.5 - 0.00% ✗ -