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Amphastar Pharmaceuticals, Inc.

AMPH Net selling

CIK 0001297184 #2610 in the set updated 22 Sep 2026

Bought (1 mo)

$0.00

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

Sold (1 mo)

$314.71K

$0.00 on a plan · $239.40K straight out of an exercise

Sold at will

$75.31K

1 of 2 sales

Net

−$314.71K

−$75.31K against sales at will

By person

12 insiders · 2 transactions

106×

Jack Yongfeng Zhang holds 106 times base salary in stock. $101.39M 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 $23.94, the price Common Stock was last bought or sold at on the open market here, on 16 Sep 2026.

Insider

Role

Bought

Sold

Net

Holding

Of company

Worth

Change

Zhou Rong

SENIOR EVP, PRODUCTION CENTER

—

$314.71K (2) scheduled

−$314.71K

349,197

0.8209%

$8.36M

+16.5%

Zhang Jack Y.

CEO & CHIEF SCIENTIFIC OFFICER

—

4,235,177

9.96%

$101.39M

+9.6%

PETERS WILLIAM J

CFO, EVP & TREASURER

—

172,846

0.4063%

$4.14M

+80.9%

Lee Howard

Director

—

159,350

0.3746%

$3.81M

+7.8%

Liawatidewi Yakob

EVP CORP ADMIN CENTER

—

121,892

0.2865%

$2.92M

+61.5%

Petersen Floyd F.

Director

—

71,368

0.1678%

$1.71M

−5.4%

ZASLOFF MICHAEL A

Director

—

37,667

0.0885%

$901.76K

+54.4%

Gerst Diane G.

Director

—

31,899

0.0750%

$763.67K

+71.2%

PRINS RICHARD K

Director

—

29,625

0.0696%

$709.23K

+4.9%

Deflin Gayle

Director

—

19,057

0.0448%

$456.23K

+229.0%

Gaugh David Russell

Director

—

14,447

0.0340%

$345.87K

—

Pierce Anthony T

Director

—

7,886

0.0185%

$188.79K

—

Individual transactions

Insider

Date

Role

Action

Price

Amount

Zhou Rong

16 Sep 2026

SENIOR EVP, PRODUCTION CENTER

Sold after exercise

10,000

$23.94

$239.40K

Show all 2 transactions →

What was left out

Form 4 filings counted 2

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 1

Sales at will 1

Transactions with no price 0

Shares from compensation/vesting 10,000

History held since 2 Sep 2016