There have been 50 recent insider transactions recorded for Amphastar Pharmaceuticals, Inc. (AMPH), including 11 buys and 38 sells. Total insider buying was valued at $9.61M and total insider selling at $4.5M.
Notable insiders with recent activity include Peters William J, Zhang Jack Y., Zhou Rong. Insider transactions can provide insights into how company leadership views the stock's valuation and future prospects.
Insider Transactions — AMPH
| Date |
Name |
Role |
Transaction |
Shares |
Avg. Price |
Value |
Shares Owned |
| 2026-03-15 |
Peters William J |
CFO, EVP & Treasurer |
Tax Withholding of RSU |
1,973 |
$18.18 |
$35.87K |
175,063 |
| 2026-03-15 |
Zhang Jack Y. |
10 Percent Owner, Officer: CEO & Chief Scientific Officer |
Tax Withholding of RSU |
2,908 |
$18.18 |
$52.87K |
1,245,125 |
| 2026-03-15 |
Zhou Rong |
Senior EVP, Production Center |
Tax Withholding of RSU |
1,225 |
$18.18 |
$22.27K |
171,554 |
| 2026-03-15 |
Liawatidewi Yakob |
EVP Corp Admin Center |
Tax Withholding of RSU |
1,033 |
$18.18 |
$18.78K |
121,892 |
| 2026-03-10 |
Peters William J |
CFO, EVP & Treasurer |
Tax Withholding of RSU |
3,297 |
$18.91 |
$62.35K |
177,036 |
| 2026-03-10 |
Zhang Jack Y. |
10 Percent Owner, Officer: CEO & Chief Scientific Officer |
Tax Withholding of RSU |
4,395 |
$18.91 |
$83.11K |
1,248,033 |
| 2026-03-10 |
Zhou Rong |
Senior EVP, Production Center |
Tax Withholding of RSU |
2,215 |
$18.91 |
$41.89K |
172,779 |
| 2026-03-10 |
Liawatidewi Yakob |
EVP Corp Admin Center |
Tax Withholding of RSU |
1,870 |
$18.91 |
$35.36K |
122,925 |
| 2026-03-09 |
Peters William J |
CFO, EVP & Treasurer |
RSU Award |
121,071 |
$19.21 |
$2.33M |
121,071 |
| 2026-03-09 |
Zhang Jack Y. |
10 Percent Owner, Officer: CEO & Chief Scientific Officer |
RSU Award |
149,472 |
$19.21 |
$2.87M |
149,472 |
| 2026-03-09 |
Zhou Rong |
Senior EVP, Production Center |
RSU Award |
81,341 |
$19.21 |
$1.56M |
81,341 |
| 2026-03-09 |
Liawatidewi Yakob |
EVP Corp Admin Center |
RSU Award |
73,126 |
$19.21 |
$1.4M |
73,126 |
| 2026-03-06 |
Peters William J |
CFO, EVP & Treasurer |
Tax Withholding of RSU |
2,146 |
$19.34 |
$41.5K |
121,640 |
| 2026-03-06 |
Zhang Jack Y. |
10 Percent Owner, Officer: CEO & Chief Scientific Officer |
Tax Withholding of RSU |
3,077 |
$19.34 |
$59.51K |
1,179,966 |
| 2026-03-06 |
Zhou Rong |
Senior EVP, Production Center |
Tax Withholding of RSU |
1,357 |
$19.34 |
$26.24K |
135,562 |
| 2026-03-06 |
Liawatidewi Yakob |
EVP Corp Admin Center |
Tax Withholding of RSU |
1,144 |
$19.34 |
$22.12K |
89,345 |
| 2026-03-04 |
Peters William J |
CFO, EVP & Treasurer |
Tax Withholding of RSU |
1,744 |
$19.96 |
$34.81K |
123,786 |
| 2026-03-04 |
Zhang Jack Y. |
10 Percent Owner, Officer: CEO & Chief Scientific Officer |
Tax Withholding of RSU |
2,432 |
$19.96 |
$48.54K |
1,183,043 |
| 2026-03-04 |
Zhou Rong |
Senior EVP, Production Center |
Tax Withholding of RSU |
1,124 |
$19.96 |
$22.44K |
136,919 |
| 2026-03-04 |
Liawatidewi Yakob |
EVP Corp Admin Center |
Tax Withholding of RSU |
965 |
$19.96 |
$19.26K |
90,489 |
| 2025-12-17 |
Zhou Rong |
Senior EVP, Production Center |
Option Exercise (Sell) |
9,787 |
$11.33 |
$110.89K |
- |
| 2025-12-12 |
Petersen Floyd F. |
Director |
Informative Sell |
2,426 |
$25.92 |
$62.89K |
71,368 |
| 2025-12-11 |
Petersen Floyd F. |
Director |
Informative Sell |
1,737 |
$25.69 |
$44.62K |
73,794 |
| 2025-11-25 |
Prins Richard K |
Director |
Option Exercise (Sell) |
4,179 |
$16.69 |
$69.75K |
- |
| 2025-11-13 |
Petersen Floyd F. |
Director |
Option Exercise (Sell) |
16,679 |
$16.69 |
$278.37K |
- |
| 2025-11-03 |
Petersen Floyd F. |
Director |
Informative Sell |
500 |
$25.27 |
$12.63K |
75,531 |
| 2025-10-01 |
Petersen Floyd F. |
Director |
Informative Sell |
500 |
$27.20 |
$13.6K |
76,031 |
| 2025-09-02 |
Petersen Floyd F. |
Director |
Informative Sell |
500 |
$30.98 |
$15.49K |
76,531 |
| 2025-08-01 |
Petersen Floyd F. |
Director |
Informative Sell |
500 |
$20.83 |
$10.42K |
77,031 |
| 2025-07-18 |
Gaugh David Russell |
Officer |
Unknown |
- |
- |
- |
- |
| 2025-07-18 |
Gaugh David Russell |
Director |
RSU Award |
6,304 |
- |
- |
6,304 |
| 2025-07-02 |
Petersen Floyd F. |
Director |
Informative Sell |
500 |
$23.47 |
$11.73K |
77,531 |
| 2025-06-13 |
Zhang Jack Y. |
10 Percent Owner, Officer: CEO & Chief Scientific Officer |
Option Exercise (Sell) |
200,000 |
$13.03 |
$2.61M |
205,003 |
| 2025-06-03 |
Lee Howard |
Director |
Tax Withholding of RSU |
923 |
$26.01 |
$24.01K |
151,976 |
| 2025-06-02 |
Zasloff Michael A |
Director |
RSU Award |
11,402 |
$25.38 |
$289.38K |
11,402 |
| 2025-06-02 |
Prins Richard K |
Director |
RSU Award |
11,402 |
$25.38 |
$289.38K |
11,402 |
| 2025-06-02 |
Lee Howard |
Director |
RSU Award |
11,402 |
$25.38 |
$289.38K |
11,402 |
| 2025-06-02 |
Gerst Diane G. |
Director |
RSU Award |
11,402 |
$25.38 |
$289.38K |
11,402 |
| 2025-06-02 |
Petersen Floyd F. |
Director |
RSU Award |
11,402 |
$25.38 |
$289.38K |
11,402 |
| 2025-06-02 |
Deflin Gayle |
Director |
RSU Award |
5,122 |
- |
- |
10,914 |
| 2025-05-19 |
Peters William J |
CFO, EVP & Treasurer |
Tax Withholding of RSU |
273 |
$24.79 |
$6.77K |
124,985 |
| 2025-05-01 |
Petersen Floyd F. |
Director |
Informative Sell |
500 |
$24.08 |
$12.04K |
73,409 |
| 2025-04-01 |
Petersen Floyd F. |
Director |
Informative Sell |
500 |
$28.38 |
$14.19K |
73,909 |
| 2025-03-17 |
Peters William J |
CFO, EVP & Treasurer |
Tax Withholding of RSU |
3,004 |
$27.69 |
$83.18K |
125,258 |
| 2025-03-17 |
Zhang Jack Y. |
10 Percent Owner, Officer: CEO & Chief Scientific Officer |
Tax Withholding of RSU |
7,223 |
$27.69 |
$200K |
1,185,475 |
| 2025-03-17 |
Zhou Rong |
Senior EVP, Production Center |
Tax Withholding of RSU |
1,967 |
$27.69 |
$54.47K |
137,497 |
| 2025-03-17 |
Liawatidewi Yakob |
EVP Corp Admin Center |
Tax Withholding of RSU |
1,731 |
$27.69 |
$47.93K |
90,909 |
| 2025-03-15 |
Peters William J |
CFO, EVP & Treasurer |
Tax Withholding of RSU |
1,968 |
$26.66 |
$52.47K |
128,262 |
| 2025-03-15 |
Zhang Jack Y. |
10 Percent Owner, Officer: CEO & Chief Scientific Officer |
Tax Withholding of RSU |
4,115 |
$26.66 |
$109.71K |
1,192,698 |
| 2025-03-15 |
Zhou Rong |
Senior EVP, Production Center |
Tax Withholding of RSU |
1,222 |
$26.66 |
$32.58K |
139,464 |
■ Informative Buy/Sell — open market transaction (most significant)
■ Uninformative Buy — award, option exercise, conversion
■ Uninformative Sell — tax withholding, award vest sale
■ Neutral — gift, trust, expiry
