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 S  AS  JS*  OS  OS*  3
 JB
 JS
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Detailed Insider History for:
AMPHASTAR PHARMACEUTICALS INC: AMPH
Price: 3/13/26 52-Wk
High		 52-Wk
Low		 Mkt Cap (mm) Shrs Out (mm) 3-Mth Ave
Vol (m)		 Ind. Yield Short Int
% Float		 Inst. Owned Insider Owned
$18.18 $31.26 $17.03 $835 45 448 0.0% 16.6% 76.65% 25.20%
Exch Sector Industry Sub-Industry
NasdaqGS Manufacturing Chemicals And Allied Products Pharmaceutical Preparations
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Insider Statistics
T N H M S
Filer Name
Insider Title
Trans Type
Dollar Value
Shares Traded
Trans Date From
Trans Date To
Trans Price From
Trans Price To
Total Holdings
Delta % Owned
Owned
Other Info
Input Date
1
    
 
PETERS WILLIAM J
CFO,VP,TR,DIR
JS
$62,346
3,297
---
3/10/26
---
$18.91
177,036
-1.8
D
R
3/11/26 - 9:29:26 pm
2
    
 
ZHOU RONG
VP
JS
$41,886
2,215
---
3/10/26
---
$18.91
172,779
-1.3
D
R
3/11/26 - 8:15:55 pm
3
    
 
LIAWATIDEWI YAKOB
VP,DIR
JS
$35,362
1,870
---
3/10/26
---
$18.91
122,925
-1.5
D
R
3/11/26 - 6:26:27 pm
4
    
 
ZHANG JACK Y
CEO,DIR,BO
JS
$279,584
14,785
---
3/10/26
---
$18.91
2,999,836
-0.5
D
R
3/11/26 - 5:58:21 pm
5
    
 
ZHANG JACK Y
CEO,DIR,BO
JS
$83,109
4,395
---
3/10/26
---
$18.91
1,248,033
-0.4
I
R
3/11/26 - 5:58:21 pm
6
    
 
PETERS WILLIAM J
CFO,VP,TR,DIR
JB
---
58,693
---
3/9/26
---
---
180,333
48.3
D
R
3/11/26 - 9:29:26 pm
7
    
 
ZHOU RONG
VP
JB
---
39,432
---
3/9/26
---
---
174,994
29.1
D
R
3/11/26 - 8:15:55 pm
8
    
 
LIAWATIDEWI YAKOB
VP,DIR
JB
---
35,450
---
3/9/26
---
---
124,795
39.7
D
R
3/11/26 - 6:26:27 pm
9
    
 
ZHANG JACK Y
CEO,DIR,BO
JB
---
180,504
---
3/9/26
---
---
3,014,621
6.4
D
R
3/11/26 - 5:58:21 pm
10
    
 
ZHANG JACK Y
CEO,DIR,BO
JB
---
72,462
---
3/9/26
---
---
1,252,428
6.1
I
R
3/11/26 - 5:58:21 pm
11
    
 
PETERS WILLIAM J
CFO,VP,TR,DIR
JS
$41,504
2,146
---
3/6/26
---
$19.34
121,640
-1.7
D
R
3/10/26 - 9:03:09 pm
12
    
 
ZHOU RONG
VP
JS
$26,244
1,357
---
3/6/26
---
$19.34
135,562
-1.0
D
R
3/10/26 - 5:44:10 pm
13
    
 
LIAWATIDEWI YAKOB
VP,DIR
JS
$22,125
1,144
---
3/6/26
---
$19.34
89,345
-1.3
D
R
3/10/26 - 5:42:54 pm
14
    
 
ZHANG JACK Y
CEO,DIR,BO
JS
$59,509
3,077
---
3/6/26
---
$19.34
1,179,966
-0.3
I
R
3/10/26 - 5:41:43 pm
15
    
 
ZHANG JACK Y
CEO,DIR,BO
JS
$150,330
7,773
---
3/6/26
---
$19.34
2,834,117
-0.3
D
R
3/10/26 - 5:41:43 pm
16
    
 
ZHANG JACK Y
CEO,DIR,BO
JS
$48,543
2,432
---
3/4/26
---
$19.96
1,183,043
-0.2
I
R
3/6/26 - 9:58:54 pm
17
    
 
ZHANG JACK Y
CEO,DIR,BO
JS
$115,149
5,769
---
3/4/26
---
$19.96
2,841,890
-0.2
D
R
3/6/26 - 9:58:54 pm
18
    
 
ZHOU RONG
VP
JS
$22,435
1,124
---
3/4/26
---
$19.96
136,919
-0.8
D
R
3/6/26 - 9:06:34 pm
19
    
 
LIAWATIDEWI YAKOB
VP,DIR
JS
$19,261
965
---
3/4/26
---
$19.96
90,489
-1.1
D
R
3/6/26 - 9:04:17 pm
20
    
 
PETERS WILLIAM J
CFO,VP,TR,DIR
JS
$34,810
1,744
---
3/4/26
---
$19.96
123,786
-1.4
D
R
3/6/26 - 9:02:52 pm
21
1y
24
63%
4%
1
ZHOU RONG
VP
OS
$256,379
9,787
---
12/17/25
---
$26.20
138,043
-6.6
D
---
12/18/25 - 5:23:24 pm
22
    
 
ZHOU RONG
VP
OE
$110,887
9,787
---
12/17/25
---
$11.33
147,830
7.1
D
---
12/18/25 - 5:23:24 pm
23
1y
60
43%
11%
1
PETERSEN FLOYD F
DIR
S
$107,508
4,163
12/11/25
12/12/25
$25.69
$25.92
71,368
-5.5
D
---
12/15/25 - 5:17:42 pm
24
1y
35
51%
4%
3
PRINS RICHARD K
DIR
OS
$113,253
4,179
---
11/25/25
---
$27.10
35,183
-10.6
D
---
11/25/25 - 7:38:45 pm
25
    
 
PRINS RICHARD K
DIR
OE
$69,748
4,179
---
11/25/25
---
$16.69
39,362
11.9
D
---
11/25/25 - 7:38:45 pm
26
1y
60
43%
11%
1
PETERSEN FLOYD F
DIR
OS
$441,837
16,679
---
11/13/25
---
$26.49
75,531
-18.1
D
---
11/17/25 - 4:16:33 pm
27
    
 
PETERSEN FLOYD F
DIR
OE
$278,373
16,679
---
11/13/25
---
$16.69
92,210
22.1
D
---
11/17/25 - 4:16:33 pm
28
1y
60
43%
11%
1
PETERSEN FLOYD F
DIR
AS
$12,633
500
---
11/3/25
---
$25.27
75,531
-0.7
D
10b
11/5/25 - 4:20:12 pm
29
1y
60
43%
11%
1
PETERSEN FLOYD F
DIR
AS
$13,602
500
---
10/1/25
---
$27.20
76,031
-0.7
D
10b
10/2/25 - 5:04:26 pm
30
1y
60
43%
11%
1
PETERSEN FLOYD F
DIR
AS
$15,492
500
---
9/2/25
---
$30.98
76,531
-0.6
D
10b
9/3/25 - 4:20:45 pm
31
1y
60
43%
11%
1
PETERSEN FLOYD F
DIR
AS
$10,416
500
---
8/1/25
---
$20.83
77,031
-0.6
D
10b
8/4/25 - 7:17:46 pm
32
    
 
GAUGH DAVID RUSSELL
DIR
JB
---
6,304
---
7/18/25
---
---
6,304
New
D
R
7/22/25 - 4:23:29 pm
33
    
 
GAUGH DAVID RUSSELL
DIR
3
---
---
---
7/18/25
---
---
---
---
---
---
7/22/25 - 4:20:31 pm
34
1y
60
43%
11%
1
PETERSEN FLOYD F
DIR
AS
$11,734
500
---
7/2/25
---
$23.47
77,531
-0.6
D
10b
7/3/25 - 5:30:47 pm
35
1y
12
67%
4%
1
ZHANG JACK Y
CEO,DIR,BO
OB
$2,606,000
200,000
---
6/13/25
---
$13.03
2,847,659
7.6
D
---
6/16/25 - 5:19:35 pm
36
    
 
LEE HOWARD
DIR
JS
$24,007
923
---
6/3/25
---
$26.01
151,976
-0.6
D
R
6/4/25 - 8:04:41 pm
37
    
 
LEE HOWARD
DIR
JB
---
5,122
---
6/2/25
---
---
152,899
3.5
D
R
6/4/25 - 8:04:41 pm
38
    
 
DEFLIN GAYLE
DIR
JB
---
5,122
---
6/2/25
---
---
10,914
88.4
D
R
6/4/25 - 7:45:15 pm
39
    
 
GERST DIANE G
DIR
JB
---
5,122
---
6/2/25
---
---
23,756
27.5
D
R
6/4/25 - 7:02:01 pm
40
    
 
PRINS RICHARD K
DIR
JB
---
5,122
---
6/2/25
---
---
35,183
17.0
D
R
6/4/25 - 6:40:49 pm
41
1y
60
43%
11%
1
PETERSEN FLOYD F
DIR
AS
$12,835
500
---
6/2/25
---
$25.67
72,909
-0.7
D
R,10b
6/4/25 - 6:39:36 pm
42
    
 
PETERSEN FLOYD F
DIR
JB
---
5,122
---
6/2/25
---
---
78,031
7.0
D
R,10b
6/4/25 - 6:39:36 pm
43
    
 
ZASLOFF MICHAEL A
DIR
JB
---
5,122
---
6/2/25
---
---
29,524
21.0
D
R
6/4/25 - 6:30:35 pm
44
    
 
PETERS WILLIAM J
CFO,VP,TR,DIR
JS
$6,768
273
---
5/19/25
---
$24.79
124,985
-0.2
D
R
5/20/25 - 5:02:46 pm
45
1y
60
43%
11%
1
PETERSEN FLOYD F
DIR
AS
$12,041
500
---
5/1/25
---
$24.08
73,409
-0.7
D
10b
5/2/25 - 8:27:05 pm
46
1y
60
43%
11%
1
PETERSEN FLOYD F
DIR
AS
$14,190
500
---
4/1/25
---
$28.38
73,909
-0.7
D
10b
4/2/25 - 6:45:10 pm
47
    
 
ZHOU RONG
VP
JS
$87,045
3,189
3/15/25
3/17/25
$26.66
$27.69
137,497
-2.3
D
R
3/18/25 - 7:43:26 pm
48
1y
34
38%
12%
1
ZHANG JACK Y
CEO,DIR,BO
OS
$4,646,147
173,995
3/14/25
3/17/25
$26.66
$27.69
1,185,475
-12.8
I
R
3/18/25 - 7:13:17 pm
49
1y
34
38%
12%
1
ZHANG JACK Y
CEO,DIR,BO
OS
$6,740,287
252,200
3/14/25
3/17/25
$26.66
$27.69
2,647,659
-8.7
D
R
3/18/25 - 7:13:17 pm
50
    
 
LIAWATIDEWI YAKOB
VP,DIR
JS
$75,418
2,762
3/15/25
3/17/25
$26.66
$27.69
90,909
-2.9
D
R
3/18/25 - 6:41:24 pm
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