Sign In
Buy AMPH
Amphastar Pharmaceuticals Stock Insider Power
Based on the 100 latest insides trades, we have calculated the insider power to be positive at 62.05. In total, the insiders bought 2.42M and sold 115.44K AMPH shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.
Insider Power
|
62.05 |
| ● Buy | 2.42M shares |
| ● Sell | 115.44K shares |
|
60% Buy Activity
Moderate Negative Correlation
|
|
Historical Insider Trades
| Date | Type | Person | Role | Amount |
|---|---|---|---|---|
|
Jun 02, 2026 Sell |
Lee Howard Director |
769 Value: $14.2K |
||
|
Jun 01, 2026 Buy |
Deflin Gayle Director |
17 365 Value: $319.9K |
||
|
Jun 01, 2026 Buy |
Gaugh David Russell Director |
8 143 Value: $150.0K |
||
|
Jun 01, 2026 Buy |
Gerst Diane G. Director |
17 365 Value: $319.9K |
||
|
Jun 01, 2026 Buy |
Zasloff Michael A Director |
17 365 Value: $319.9K |
||
|
Jun 01, 2026 Buy |
Prins Richard K Director |
8 143 Value: $150.0K |
||
|
Jun 01, 2026 Buy |
Prins Richard K Director |
17 365 Value: $319.9K |
||
|
Jun 01, 2026 Buy |
Lee Howard Director |
8 143 Value: $150.0K |
||
|
Jun 01, 2026 Buy |
Lee Howard Director |
17 365 Value: $319.9K |
||
|
Jun 01, 2026 Buy |
Zasloff Michael A Director |
8 143 Value: $150.0K |
||
|
Jun 01, 2026 Buy |
Gerst Diane G. Director |
8 143 Value: $150.0K |
||
|
Jun 01, 2026 Buy |
Gaugh David Russell Director |
17 365 Value: $319.9K |
||
|
Jun 01, 2026 Buy |
Deflin Gayle Director |
8 143 Value: $150.0K |
||
|
Mar 15, 2026 Sell |
Zhang Jack Y. CEO & Chief Scientific Officer |
2 908 Value: $52.9K |
||
|
Mar 15, 2026 Sell |
Zhang Jack Y. CEO & Chief Scientific Officer |
9 784 Value: $177.9K |
||
|
Mar 15, 2026 Sell |
Zhou Rong Senior EVP, Production Center |
1 225 Value: $22.3K |
||
|
Mar 15, 2026 Sell |
Liawatidewi Yakob EVP Corp Admin Center |
1 033 Value: $18.8K |
||
|
Mar 15, 2026 Sell |
Peters William J CFO, EVP & Treasurer |
1 973 Value: $35.9K |
||
|
Mar 10, 2026 Sell |
Zhang Jack Y. CEO & Chief Scientific Officer |
14 785 Value: $279.6K |
||
|
Mar 10, 2026 Sell |
Zhou Rong Senior EVP, Production Center |
2 215 Value: $41.9K |
||
|
Mar 10, 2026 Sell |
Peters William J CFO, EVP & Treasurer |
3 297 Value: $62.3K |
||
|
Mar 10, 2026 Sell |
Liawatidewi Yakob EVP Corp Admin Center |
1 870 Value: $35.4K |
||
|
Mar 10, 2026 Sell |
Zhang Jack Y. CEO & Chief Scientific Officer |
4 395 Value: $83.1K |
||
|
Mar 09, 2026 Buy |
Zhang Jack Y. CEO & Chief Scientific Officer |
149 472 Value: $2.87M |
||
|
Mar 09, 2026 Buy |
Zhang Jack Y. CEO & Chief Scientific Officer |
372 338 Value: $7.15M |
About Insider Power
Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.
It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.
While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.
* October 6th, 2025 - Tested on 5562 stocks
