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 0 buys and 25 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 10 filings

Date	Ticker	Role	Type	Shares	Price	Value	Chg%
May 20, 2022	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Sell	10,650	$34.21	$364,365.26	-0.5%
May 19, 2022	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Sell	108,776	$34.00	$3,697,861.29	-1.0%
May 17, 2022	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Sell	118,445	$35.75	$4,234,897.09	-1.3%
Feb 18, 2021	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Sell	30,467	$18.59	$566,315.49	-0.1%
Feb 12, 2021	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Sell	48,847	$18.93	$924,750.44	-0.2%
Feb 9, 2021	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Sell	40,886	$18.92	$773,546.00	-0.2%
Feb 4, 2021	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Sell	41,869	$18.69	$782,342.84	-0.3%
Feb 2, 2021	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Sell	37,931	$18.43	$698,940.89	-0.3%
Sep 11, 2019	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Sell	300,000	$20.82	$6,246,000.00	-4.1%
Dec 14, 2018	AMPH Amphastar Pharmaceuticals, Inc.	CEO &Chief Scientific Officer	Sell	43,577	$20.48	$892,308.80	-2.1%