Zhang Jack Y.

CEO &Chief Scientific Officer | CEO &Chief Scientific Officer | CEO &Chief Science Officer

1 company

Average

Trades Analyzed

12M Win Rate

0.0%

Avg 3M Return

+2.2%

Avg 12M Return

-32.9%

Zhang Jack Y. is a CEO &Chief Scientific Officer at Amphastar Pharmaceuticals, Inc.. Recent SEC Form 4 filings include 2 buys and 31 sells.

Estimated insider holdings value: $25.3M based on current market prices.

Holdings by Company

AMPHMar 10, 2026

Current Shares1.25M

Value$25.26M

Net Activity-1,889,197

Bought: 40.0KSold: 1.93M

Showing 9 filings (page 2)

Date	Ticker	Role	Type	Shares	Price	Value	Chg%
Dec 13, 2018	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Sell	133,915	$21.29	$2,851,052.30	-0.5%
May 16, 2018	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Buy	40,000	$16.07	$642,823.50	+1.0%
Sep 21, 2016	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Science Officer	Sale+OE	444,199	$21.03	$9,342,803.66	-6.8%
Dec 11, 2015	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Science Officer	Sell	63,300	$14.25	$901,752.94	-0.3%
Dec 8, 2015	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Science Officer	Sell	68,117	$14.71	$1,001,909.18	-0.3%
Dec 3, 2015	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Science Officer	Sell	38,583	$15.45	$596,240.66	-0.3%
Jun 15, 2015	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Science Officer	Sale+OE	45,382	$16.29	$739,445.23	-4.7%
Jun 12, 2015	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Science Officer	Sale+OE	160,495	$16.23	$2,605,207.03	-3.3%
Jun 9, 2015	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Science Officer	Sale+OE	193,758	$16.43	$3,183,419.43	-3.9%