← All stocks

Amphastar Pharmaceuticals, Inc.

AMPH Net selling

CIK 0001297184 #2610 in the set updated 17 Sep 2026

Bought (1 mo)

$0.00

out of their own pocket, the only kind of buying there is

Sold (1 mo)

$75.31K

$0.00 on a plan · $0.00 straight out of an exercise

Sold at will

$75.31K

1 of 1 sales

Net

−$75.31K

−$75.31K against sales at will

By person

12 insiders · 1 transaction

105×

Jack Yongfeng Zhang holds 105 times base salary in stock. $100.07M 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 $23.63, the price Common Stock was last bought or sold at on the open market here, on 2 Sep 2026.

Insider

Role

Bought

Sold

Net

Holding

Of company

Worth

Change

Zhou Rong

SENIOR EVP, PRODUCTION CENTER

—

$75.31K (1)

−$75.31K

349,197

0.8209%

$8.25M

+16.5%

Zhang Jack Y.

CEO & CHIEF SCIENTIFIC OFFICER

—

4,235,177

9.96%

$100.07M

+9.6%

PETERS WILLIAM J

CFO, EVP & TREASURER

—

172,846

0.4063%

$4.08M

+80.9%

Lee Howard

Director

—

159,350

0.3746%

$3.77M

+7.8%

Liawatidewi Yakob

EVP CORP ADMIN CENTER

—

121,892

0.2865%

$2.88M

+61.5%

Petersen Floyd F.

Director

—

71,368

0.1678%

$1.69M

−5.4%

ZASLOFF MICHAEL A

Director

—

37,667

0.0885%

$890.04K

+54.4%

Gerst Diane G.

Director

—

31,899

0.0750%

$753.74K

+71.2%

PRINS RICHARD K

Director

—

29,625

0.0696%

$700.01K

+4.9%

Deflin Gayle

Director

—

19,057

0.0448%

$450.30K

+229.0%

Gaugh David Russell

Director

—

14,447

0.0340%

$341.37K

—

Pierce Anthony T

Director

—

7,886

0.0185%

$186.34K

—

Individual transactions

Nothing of that kind in this period.

What was left out

Form 4 filings counted 1

Amendments (4/A) skipped 0

Filings about a different issuer 0

Unreadable filings 0

Joint filings 0

Sales on a Rule 10b5-1 plan 0

Sales straight out of an exercise 0

Sales at will 1

Transactions with no price 0

Shares from compensation/vesting 0

History held since 2 Sep 2016