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Transaction Types Key To InsiderInsights' Infobase
 B  AB  JB*  OB  OE*  OE
 S  AS  JS*  OS  OS*  3
 JB
 JS
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Detailed Insider History for:
AMPHASTAR PHARMACEUTICALS INC: AMPH
Price: 4/4/25 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
$26.61 $53.96 $25.89 $1,268 48 598 0.0% 12.5% 76.08% 22.92%
Exch Sector Industry Sub-Industry
NasdaqGS Services Engineering, Accounting, Research, Management, And Related Services Services- Management Services
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#
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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
1y
10
80%
12%
1
ZHANG JACK Y
CEO,DIR,BO
OB
$1,469,000
100,000
---
6/10/24
---
$14.69
2,533,554
4.1
D
---
6/11/24 - 6:35:15 pm
2
1y
55
38%
16%
1
PETERSEN FLOYD F
DIR
S
$124,200
3,000
---
6/10/24
---
$41.40
78,409
-3.7
D
---
6/11/24 - 6:32:36 pm
3
    
 
LIAWATIDEWI YAKOB
VP,DIR
JS
$11,484
272
---
6/4/24
---
$42.22
74,938
-0.4
D
R
6/5/24 - 6:00:54 pm
4
    
 
GERST DIANE G
DIR
JB
---
3,076
---
6/3/24
---
---
18,634
19.8
D
R
6/5/24 - 7:03:10 pm
5
    
 
DEFLIN GAYLE
DIR
JB
---
3,076
---
6/3/24
---
---
5,792
113.3
D
R
6/5/24 - 6:56:31 pm
6
1y
55
38%
16%
1
PETERSEN FLOYD F
DIR
AS
$21,326
500
---
6/3/24
---
$42.65
78,333
-0.6
D
R,10b
6/5/24 - 6:54:30 pm
7
    
 
PETERSEN FLOYD F
DIR
JB
---
3,076
---
6/3/24
---
---
81,409
3.9
D
R,10b
6/5/24 - 6:54:30 pm
8
    
 
PRINS RICHARD K
DIR
JB
---
3,076
---
6/3/24
---
---
33,971
10.0
D
R
6/5/24 - 5:58:49 pm
9
    
 
ZASLOFF MICHAEL A
DIR
JB
---
3,076
---
6/3/24
---
---
24,402
14.4
D
R
6/5/24 - 5:56:54 pm
10
    
 
PETERS WILLIAM J
CFO,VP,TR,DIR
JS
$16,827
387
---
5/19/24
---
$43.48
97,268
-0.4
D
R
5/21/24 - 6:26:44 pm
11
1y
55
38%
16%
1
PETERSEN FLOYD F
DIR
AS
$20,837
500
---
5/1/24
---
$41.67
78,833
-0.6
D
10b
5/2/24 - 4:56:42 pm
12
1y
55
38%
16%
1
PETERSEN FLOYD F
DIR
AS
$21,714
500
---
4/1/24
---
$43.43
79,333
-0.6
D
10b
4/2/24 - 9:31:21 pm
13
1y
34
38%
12%
1
ZHANG JACK Y
CEO,DIR,BO
OS
$18,274,252
424,489
3/15/24
3/17/24
---
$43.05
2,433,554
-14.9
D
R
3/19/24 - 6:55:31 pm
14
1y
34
38%
12%
1
ZHANG JACK Y
CEO,DIR,BO
OS
$9,028,016
209,710
3/15/24
3/17/24
---
$43.05
1,229,756
-14.6
I
R
3/19/24 - 6:55:31 pm
15
    
 
LIAWATIDEWI YAKOB
VP,DIR
JS
$190,453
4,424
3/15/24
3/17/24
---
$43.05
74,778
-5.6
D
R
3/19/24 - 5:17:54 pm
16
    
 
ZHOU RONG
VP
JS
$238,282
5,535
3/15/24
3/17/24
---
$43.05
118,016
-4.5
D
R
3/19/24 - 5:15:22 pm
17
    
 
PETERS WILLIAM J
CFO,VP,TR,DIR
JS
$501,317
11,645
3/15/24
3/17/24
---
$43.05
97,655
-10.7
D
R
3/19/24 - 5:10:25 pm
18
1y
10
80%
12%
1
ZHANG JACK Y
CEO,DIR,BO
OB
$8,996,693
722,046
---
3/15/24
---
$12.46
2,858,043
33.8
D
R
3/19/24 - 6:55:31 pm
19
    
 
ZHANG JACK Y
CEO,DIR,BO
OE
$3,874,188
310,930
---
3/15/24
---
$12.46
1,439,466
27.6
I
R
3/19/24 - 6:55:31 pm
20
1y
54
48%
8%
2
PETERS WILLIAM J
CFO,VP,TR,DIR
OS
$842,883
18,136
---
3/6/24
$46.30
$48.00
111,490
-14.0
D
R,10b
3/8/24 - 4:52:41 pm
21
1y
54
48%
8%
2
PETERS WILLIAM J
CFO,VP,TR,DIR
OS
$101,419
2,190
---
3/6/24
---
$46.31
109,300
-2.0
D
R,10b
3/8/24 - 4:52:41 pm
22
    
 
PETERS WILLIAM J
CFO,VP,TR,DIR
OE
$99,999
8,826
---
3/6/24
---
$11.33
129,626
7.3
D
R,10b
3/8/24 - 4:52:41 pm
23
    
 
LIAWATIDEWI YAKOB
VP,DIR
JS
$56,545
1,221
---
3/6/24
---
$46.31
79,202
-1.5
D
R
3/8/24 - 4:49:30 pm
24
    
 
ZHOU RONG
VP
JS
$64,371
1,390
---
3/6/24
---
$46.31
123,551
-1.1
D
R
3/8/24 - 4:47:17 pm
25
    
 
ZHANG JACK Y
CEO,DIR,BO
JS
$325,606
7,031
---
3/6/24
---
$46.31
2,135,997
-0.3
D
R
3/8/24 - 4:32:00 pm
26
    
 
ZHANG JACK Y
CEO,DIR,BO
JS
$138,467
2,990
---
3/6/24
---
$46.31
1,128,536
-0.3
I
R
3/8/24 - 4:32:00 pm
27
1y
15
40%
6%
1
ZASLOFF MICHAEL A
DIR
S
$589,724
12,500
---
3/5/24
$47.06
$47.53
21,326
-37.0
D
---
3/6/24 - 5:57:25 pm
28
    
 
ZHANG JACK Y
CEO,DIR,BO
JB
---
64,310
---
3/4/24
---
---
2,143,028
3.1
D
R
3/6/24 - 6:29:28 pm
29
    
 
ZHANG JACK Y
CEO,DIR,BO
JB
---
27,110
---
3/4/24
---
---
1,131,526
2.5
I
R
3/6/24 - 6:29:28 pm
30
    
 
LIAWATIDEWI YAKOB
VP,DIR
JB
---
10,754
---
3/4/24
---
---
80,423
15.4
D
R
3/6/24 - 5:54:00 pm
31
    
 
ZHOU RONG
VP
JB
---
12,521
---
3/4/24
---
---
124,941
11.1
D
R
3/6/24 - 5:51:48 pm
32
    
 
PETERS WILLIAM J
CFO,VP,TR,DIR
JB
---
19,440
---
3/4/24
---
---
120,800
19.2
D
R
3/6/24 - 5:49:35 pm
33
1y
55
38%
16%
1
PETERSEN FLOYD F
DIR
AS
$22,847
500
---
3/1/24
$45.60
$46.53
79,833
-0.6
D
10b
3/4/24 - 8:35:23 pm
34
1y
55
38%
16%
1
PETERSEN FLOYD F
DIR
AS
$26,548
500
---
2/1/24
$53.07
$53.64
80,333
-0.6
D
10b
2/2/24 - 7:37:11 pm
35
    
 
LUO MARY Z
COO,DIR,BO
AS
$7,171,768
131,386
---
1/10/24
$54.32
$57.00
1,104,416
-10.6
D
10b
1/11/24 - 4:37:53 pm
36
    
 
LUO MARY Z
COO,DIR,BO
AS
$12,798,708
219,800
1/8/24
1/9/24
$56.70
$58.35
1,235,802
-15.1
D
10b
1/10/24 - 6:27:18 pm
37
1y
55
38%
16%
1
PETERSEN FLOYD F
DIR
AS
$8,902
147
---
1/2/24
---
$60.56
81,186
-0.2
D
10b
1/3/24 - 7:25:01 pm
38
1y
55
38%
16%
1
PETERSEN FLOYD F
DIR
AS
$21,781
353
---
1/2/24
---
$61.70
80,833
-0.4
D
10b
1/3/24 - 7:25:01 pm
39
1y
20
55%
13%
1
ZHOU RONG
VP
OS
$462,195
7,830
12/1/23
12/4/23
$58.58
$59.58
112,420
-6.5
D
---
12/5/23 - 6:25:04 pm
40
    
 
ZHOU RONG
VP
OE
$119,042
7,830
12/1/23
12/4/23
$14.40
$16.19
116,736
7.2
D
---
12/5/23 - 6:25:04 pm
41
1y
55
38%
16%
1
PETERSEN FLOYD F
DIR
AS
$28,952
500
---
12/1/23
$57.24
$58.15
81,333
-0.6
D
10b
12/4/23 - 8:49:41 pm
42
1y
32
47%
8%
3
PRINS RICHARD K
DIR
S
$223,446
4,000
---
11/17/23
---
$55.86
31,895
-11.1
D
---
11/20/23 - 5:23:35 pm
43
    
 
PRINS RICHARD K
DIR
JS
---
1,000
---
11/17/23
---
---
30,895
-3.1
D
---
11/20/23 - 5:23:35 pm
44
1y
54
48%
8%
2
PETERS WILLIAM J
CFO,VP,TR,DIR
OS
$3,298,475
59,250
---
11/14/23
$54.76
$56.53
101,360
-36.9
D
10b
11/16/23 - 4:05:15 pm
45
    
 
PETERS WILLIAM J
CFO,VP,TR,DIR
OE
$925,028
59,250
---
11/14/23
---
$13.03
160,610
58.5
D
10b
11/16/23 - 4:05:15 pm
46
    
 
DEFLIN GAYLE
DIR
S
$230,838
4,163
---
11/14/23
---
$55.45
2,716
-60.5
D
---
11/15/23 - 4:30:11 pm
47
1y
32
47%
8%
3
PRINS RICHARD K
DIR
S
$262,500
5,000
---
11/13/23
---
$52.50
35,895
-12.2
D
---
11/15/23 - 4:31:26 pm
48
1y
55
38%
16%
1
PETERSEN FLOYD F
DIR
AS
$22,651
500
---
11/1/23
---
$45.30
81,833
-0.6
D
10b
11/2/23 - 8:37:19 pm
49
1y
55
38%
16%
1
PETERSEN FLOYD F
DIR
AS
$22,890
500
---
10/2/23
---
$45.78
82,333
-0.6
D
10b
10/3/23 - 6:38:33 pm
50
1y
54
48%
8%
2
PETERS WILLIAM J
CFO,VP,TR,DIR
OS
$3,143,195
60,743
---
9/6/23
$51.75
$52.26
101,360
-37.5
D
10b
9/8/23 - 4:08:31 pm
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