Stocks · Health care · Pharmaceutical Preparations

Amphastar Pharmaceuticals, Inc.

AMPH Clue Score63
United States Fiscal year ends December CIK 0001297184 Results filed 5 Nov 2026

What the insiders did Net selling

By person

12 insiders · 10 transactions
111×

Jack Yongfeng Zhang holds 111 times base salary in stock. $105.88M of shares against $950.91K in salary for 2025.

Salary from the company's own proxy. The shares are what Jack Yongfeng Zhang last reported holding, valued at $25.00, the price Common Stock was last bought or sold at on the open market here, on 21 Sep 2026.

Insider
Role
Bought
Sold
Net
Holding
Worth
Change
Rong Zhou
Senior EVP, Production Center
—
$571.09K (3) scheduled
−$571.09K
349,197
$8.73M
+16.5%
Floyd F. Petersen
Director
—
$549.35K (3) scheduled
−$549.35K
71,368
$1.78M
−5.4%
William J Peters
CFO, EVP & Treasurer
—
$287.36K (2) scheduled
−$287.36K
168,707
$4.22M
+76.5%
Richard K Prins
Director
—
$275.11K (2)
−$275.11K
29,625
$740.63K
+4.9%
Jack Y. Zhang
CEO & Chief Scientific Officer
—
—
—
4,235,177
$105.88M
+9.6%
Howard Lee
Director
—
—
—
159,350
$3.98M
+7.8%
Yakob Liawatidewi
EVP Corp Admin Center
—
—
—
121,892
$3.05M
+61.5%
Michael A Zasloff
Director
—
—
—
37,667
$941.68K
+54.4%
Diane G. Gerst
Director
—
—
—
31,899
$797.48K
+71.2%
Gayle Deflin
Director
—
—
—
19,057
$476.43K
+229.0%
David Russell Gaugh
Director
—
—
—
14,447
$361.18K
—
Anthony T Pierce
Director
—
—
—
7,886
$197.15K
—

No percentages here. These insiders hold more than one class of share between them, and the share count on file covers one of them rather than all. Dividing the two would compare different things.