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Amphastar Pharmaceuticals, Inc.

AMPH Net selling
CIK 0001297184 #2610 in the set updated 17 Sep 2026
Bought (12 mo)
$0.00
out of their own pocket, the only kind of buying there is
Sold (12 mo)
$1.37M
$26.24K on a plan · $995.36K straight out of an exercise
Sold at will
$344.67K
4 of 10 sales
Net
−$1.37M
−$344.67K against sales at will

By person

12 insiders · 10 transactions
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
Worth
Change
Petersen Floyd F.
Director
$575.58K (5) scheduled
−$575.58K
71,368
$1.69M
−5.4%
Zhou Rong
SENIOR EVP, PRODUCTION CENTER
$331.69K (2) scheduled
−$331.69K
349,197
$8.25M
+16.5%
PRINS RICHARD K
Director
$275.11K (2)
−$275.11K
29,625
$700.01K
+4.9%
PETERS WILLIAM J
CFO, EVP & TREASURER
$183.89K (1) scheduled
−$183.89K
172,846
$4.08M
+80.9%
Zhang Jack Y.
CEO & CHIEF SCIENTIFIC OFFICER
4,235,177
$100.07M
+9.6%
Lee Howard
Director
159,350
$3.77M
+7.8%
Liawatidewi Yakob
EVP CORP ADMIN CENTER
121,892
$2.88M
+61.5%
ZASLOFF MICHAEL A
Director
37,667
$890.04K
+54.4%
Gerst Diane G.
Director
31,899
$753.74K
+71.2%
Deflin Gayle
Director
19,057
$450.30K
+229.0%
Gaugh David Russell
Director
14,447
$341.37K
Pierce Anthony T
Director
7,886
$186.34K

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.

Insider
Date
Role
Action
Shares
Price
Amount
Zhou Rong
2 Sep 2026
SENIOR EVP, PRODUCTION CENTER
Sell
3,187
$23.63
$75.31K
PRINS RICHARD K
11 Aug 2026
Director
Sell
7,973
$20.30
$161.85K
PETERS WILLIAM J
7 Aug 2026
CFO, EVP & TREASURER
Sold after exercise
8,180
$22.48
$183.89K
Zhou Rong
17 Dec 2025
SENIOR EVP, PRODUCTION CENTER
Sold after exercise
9,787
$26.20
$256.38K
Petersen Floyd F.
12 Dec 2025
Director
Sell
2,426
$25.92
$62.89K
Petersen Floyd F.
11 Dec 2025
Director
Sell
1,737
$25.69
$44.62K
PRINS RICHARD K
25 Nov 2025
Director
Sold after exercise
4,179
$27.10
$113.25K
Petersen Floyd F.
13 Nov 2025
Director
Sold after exercise
16,679
$26.49
$441.84K
Petersen Floyd F.
3 Nov 2025
Director
Sold on a plan
500
$25.27
$12.63K
Petersen Floyd F.
1 Oct 2025
Director
Sold on a plan
500
$27.20
$13.60K

What was left out

Form 4 filings counted 32
Amendments (4/A) skipped 0
Filings about a different issuer 0
Unreadable filings 0
Joint filings 4
Sales on a Rule 10b5-1 plan 2
Sales straight out of an exercise 4
Sales at will 4
Transactions with no price 0
Shares from compensation/vesting 550,768
History held since 2 Sep 2016