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Buy AMPH
Amphastar Pharmaceuticals Stock Insider Power
Based on the 100 latest insides trades, we have calculated the insider power to be positive at 62.48. In total, the insiders bought 2.43M and sold 114.94K 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
|
62.48 |
| ● Buy | 2.43M shares |
| ● Sell | 114.94K shares |
|
61% Buy Activity
Strong Negative Correlation
|
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Historical Insider Trades
| Date | Type | Person | Role | Amount |
|---|---|---|---|---|
|
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 |
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|
Mar 09, 2026 Buy |
Zhang Jack Y. CEO & Chief Scientific Officer |
372 338 Value: $7.15M |
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|
Mar 09, 2026 Buy |
Zhang Jack Y. CEO & Chief Scientific Officer |
72 462 Value: $1.39M |
||
|
Mar 09, 2026 Buy |
Zhang Jack Y. CEO & Chief Scientific Officer |
180 504 Value: $3.47M |
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|
Mar 09, 2026 Buy |
Liawatidewi Yakob EVP Corp Admin Center |
73 126 Value: $1.40M |
||
|
Mar 09, 2026 Buy |
Liawatidewi Yakob EVP Corp Admin Center |
35 450 Value: $681.0K |
||
|
Mar 09, 2026 Buy |
Zhou Rong Senior EVP, Production Center |
81 341 Value: $1.56M |
||
|
Mar 09, 2026 Buy |
Zhou Rong Senior EVP, Production Center |
39 432 Value: $757.5K |
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|
Mar 09, 2026 Buy |
Peters William J CFO, EVP & Treasurer |
58 693 Value: $1.13M |
||
|
Mar 09, 2026 Buy |
Peters William J CFO, EVP & Treasurer |
121 071 Value: $2.33M |
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|
Mar 06, 2026 Sell |
Zhou Rong Senior EVP, Production Center |
1 357 Value: $26.2K |
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|
Mar 06, 2026 Sell |
Peters William J CFO, EVP & Treasurer |
2 146 Value: $41.5K |
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|
Mar 06, 2026 Sell |
Liawatidewi Yakob EVP Corp Admin Center |
1 144 Value: $22.1K |
||
|
Mar 06, 2026 Sell |
Zhang Jack Y. CEO & Chief Scientific Officer |
7 773 Value: $150.3K |
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|
Mar 06, 2026 Sell |
Zhang Jack Y. CEO & Chief Scientific Officer |
3 077 Value: $59.5K |
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|
Mar 04, 2026 Sell |
Peters William J CFO, EVP & Treasurer |
1 744 Value: $34.8K |
||
|
Mar 04, 2026 Sell |
Liawatidewi Yakob EVP Corp Admin Center |
965 Value: $19.3K |
||
|
Mar 04, 2026 Sell |
Zhou Rong Senior EVP, Production Center |
1 124 Value: $22.4K |
||
|
Mar 04, 2026 Sell |
Zhang Jack Y. CEO & Chief Scientific Officer |
2 432 Value: $48.5K |
||
|
Mar 04, 2026 Sell |
Zhang Jack Y. CEO & Chief Scientific Officer |
5 769 Value: $115.1K |
||
|
Dec 17, 2025 Buy |
Zhou Rong Senior EVP, Production Center |
9 787 Value: $110.9K |
||
|
Dec 17, 2025 Sell |
Zhou Rong Senior EVP, Production Center |
9 787 Value: $256.4K |
||
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Dec 17, 2025 Buy |
Zhou Rong Senior EVP, Production Center |
9 787 Value: $110.9K |
||
|
Dec 12, 2025 Sell |
Petersen Floyd F. Director |
2 426 Value: $62.9K |
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
