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Detailed Insider History for:
MONOLITHIC POWER SYSTEMS INC: MPWR
Price: 10/31/25 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
$1,005.00 $1,123.38 $438.86 $48,145 48 570 0.6% 4.6% 102.09% 4.69%
Exch Sector Industry Sub-Industry
NasdaqGS Manufacturing Electronic And Other Electrical Equipment And Components, Except Computer Equipment Semiconductors & Related Devices
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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
    
 
HSING MICHAEL
CEO,DIR
JS
$133,698,936
121,918
---
10/30/25
---
$1,096.63
995,669
-10.9
D
R
10/31/25 - 4:52:23 pm
2
    
 
BLEGEN THEODORE
VP,CFO
JS
$52,965,036
48,298
---
10/30/25
---
$1,096.63
77,332
-38.4
D
R
10/31/25 - 4:45:55 pm
3
    
 
TSENG SARIA
VP,GC
JS
$59,813,492
54,543
---
10/30/25
---
$1,096.63
207,331
-20.8
D
R
10/31/25 - 4:44:52 pm
4
    
 
SCIAMMAS MAURICE
VP,SO
JS
$59,813,492
54,543
---
10/30/25
---
$1,096.63
183,306
-22.9
D
R
10/31/25 - 4:43:59 pm
5
    
 
XIAO DEMING
VP,OO
JS
$59,813,492
54,543
---
10/30/25
---
$1,096.63
201,637
-21.3
D
R
10/31/25 - 4:39:57 pm
6
    
 
TSENG SARIA
VP,GC
JB
---
135,520
---
10/25/25
---
---
261,874
107.3
D
R
10/28/25 - 9:38:53 pm
7
    
 
BLEGEN THEODORE
VP,CFO
JB
---
87,690
---
10/25/25
---
---
125,630
231.1
D
R
10/28/25 - 9:38:17 pm
8
    
 
HSING MICHAEL
CEO,DIR
JB
---
302,920
---
10/25/25
---
---
1,117,587
37.2
D
R
10/28/25 - 9:37:20 pm
9
    
 
XIAO DEMING
VP,OO
JB
---
135,520
---
10/25/25
---
---
256,180
112.3
D
R
10/28/25 - 9:36:16 pm
10
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
135,520
---
10/25/25
---
---
237,849
132.4
D
R
10/28/25 - 9:35:34 pm
11
1y
195
13%
38%
1
TSENG SARIA
VP,GC
AS
$1,413,906
1,300
---
10/24/25
---
$1,087.62
126,354
-1.0
D
10b
10/24/25 - 5:22:19 pm
12
1y
195
13%
38%
1
TSENG SARIA
VP,GC
AS
$17,139,296
16,840
10/15/25
10/16/25
$1,016.18
$1,030.81
127,654
-11.7
D
10b
10/17/25 - 12:11:43 pm
13
1y
138
20%
35%
1
BLEGEN THEODORE
VP,CFO
AS
$2,739,648
3,000
---
10/1/25
$902.61
$917.17
37,940
-7.3
D
10b
10/1/25 - 8:51:22 pm
14
    
 
MARTINEZ CARINTIA
DIR
AS
$1,260,000
1,400
---
9/18/25
---
$900.00
878
-61.5
D
10b
9/23/25 - 2:56:53 pm
15
1y
195
13%
38%
1
TSENG SARIA
VP,GC
AS
$13,268,670
14,510
---
9/18/25
---
$914.45
144,494
-9.1
D
10b
9/23/25 - 2:35:12 pm
16
1y
138
20%
35%
1
BLEGEN THEODORE
VP,CFO
AS
$2,443,032
3,000
---
9/2/25
$803.43
$822.59
40,939
-6.8
D
10b
9/3/25 - 6:39:25 pm
17
    
 
ELMIGER EUGEN J
DIR
S
$3,386,841
4,000
---
8/29/25
$844.25
$849.41
17,213
-18.9
D
---
9/2/25 - 4:04:56 pm
18
1y
28
14%
36%
1
ZHOU JEFF
DIR
S
$167,910
193
---
8/27/25
---
$870.00
5,611
-3.3
D
---
8/28/25 - 2:23:21 pm
19
    
 
SCIAMMAS MAURICE
VP,SO
JS
---
2,499
---
8/19/25
---
---
1,000
-71.4
I
---
8/21/25 - 5:09:58 pm
20
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
1,499
---
8/19/25
---
---
1,499
New
I
---
8/21/25 - 5:09:58 pm
21
1y
290
32%
18%
1
HSING MICHAEL
CEO,DIR
JS*
$16,773,550
20,231
---
8/15/25
$825.69
$836.40
814,667
-2.4
D
---
8/18/25 - 5:36:32 pm
22
1y
28
14%
36%
1
ZHOU JEFF
DIR
S
$340,000
400
---
8/13/25
---
$850.00
5,804
-6.4
D
---
8/15/25 - 2:54:31 pm
23
1y
28
14%
36%
1
ZHOU JEFF
DIR
S
$166,000
200
---
8/12/25
---
$830.00
6,204
-3.1
D
---
8/13/25 - 5:47:38 pm
24
    
 
XIAO DEMING
VP,OO
JS
---
945
---
8/11/25
---
---
120,660
-0.8
D
---
8/12/25 - 5:45:36 pm
25
    
 
XIAO DEMING
VP,OO
JB
---
945
---
8/11/25
---
---
4,336
27.9
I
---
8/12/25 - 5:45:36 pm
26
    
 
SCIAMMAS MAURICE
VP,SO
JS
---
4,836
---
8/6/25
---
---
9,481
-33.8
I
---
8/8/25 - 12:40:45 pm
27
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
4,836
---
8/6/25
---
---
44,930
12.1
I
---
8/8/25 - 12:40:45 pm
28
1y
311
14%
33%
1
XIAO DEMING
VP,OO
AS
$31,199,220
39,999
---
8/1/25
---
$780.00
121,605
-24.8
D
10b
8/4/25 - 7:58:34 pm
29
1y
138
20%
35%
1
BLEGEN THEODORE
VP,CFO
AS
$2,250,000
3,000
---
8/1/25
---
$750.00
43,939
-6.4
D
10b
8/4/25 - 7:31:55 pm
30
1y
138
20%
35%
1
BLEGEN THEODORE
VP,CFO
AS
$4,500,000
6,000
---
7/1/25
---
$750.00
46,939
-11.3
D
10b
7/2/25 - 11:46:44 am
31
    
 
SCIAMMAS MAURICE
VP,SO
JS
---
1,499
---
5/28/25
---
---
15,727
-8.7
I
---
5/30/25 - 4:32:48 pm
32
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
1,499
---
5/28/25
---
---
1,499
New
I
---
5/30/25 - 4:32:48 pm
33
1y
88
30%
24%
2
CHANG KUO WEI HERBERT
DIR
S
$36,900
50
---
5/13/25
---
$738.00
626
-7.4
D
---
5/13/25 - 6:09:12 pm
34
1y
88
30%
24%
2
CHANG KUO WEI HERBERT
DIR
S
$69,800
100
---
5/12/25
---
$698.00
676
-12.9
D
---
5/12/25 - 8:24:13 pm
35
1y
250
18%
29%
1
SCIAMMAS MAURICE
VP,SO
AS
$8,412,000
12,000
---
5/12/25
---
$701.00
4,015
-74.9
I
10b
5/12/25 - 6:02:36 pm
36
    
 
SCIAMMAS MAURICE
VP,SO
JS
---
1,878
---
5/9/25
---
---
17,226
-9.8
I
---
5/9/25 - 7:55:15 pm
37
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
1,878
---
5/9/25
---
---
40,094
4.9
I
---
5/9/25 - 7:55:15 pm
38
1y
88
30%
24%
2
CHANG KUO WEI HERBERT
DIR
S
$65,000
100
---
5/8/25
---
$650.00
776
-11.4
D
---
5/9/25 - 6:53:33 pm
39
    
 
SCIAMMAS MAURICE
VP,SO
JS
---
1,102
---
2/18/25
---
---
19,104
-5.5
I
---
2/20/25 - 7:02:07 pm
40
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
1,102
---
2/18/25
---
---
38,216
3.0
I
---
2/20/25 - 7:02:07 pm
41
1y
290
32%
18%
1
HSING MICHAEL
CEO,DIR
S
$3,640,000
5,200
---
2/18/25
---
$700.00
834,898
-0.6
D
---
2/20/25 - 7:01:31 pm
42
    
 
SCIAMMAS MAURICE
VP,SO
JS
---
5,050
---
2/11/25
---
---
10,899
-31.7
I
---
2/13/25 - 6:00:59 pm
43
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
5,050
---
2/11/25
---
---
37,114
15.7
I
---
2/13/25 - 6:00:59 pm
44
1y
311
14%
33%
1
XIAO DEMING
VP,OO
S
$474,721
662
---
2/10/25
---
$717.10
161,577
-0.4
D
R
2/12/25 - 3:45:56 pm
45
1y
195
13%
38%
1
TSENG SARIA
VP,GC
S
$475,438
663
---
2/10/25
---
$717.10
158,977
-0.4
D
R
2/12/25 - 3:45:28 pm
46
1y
250
18%
29%
1
SCIAMMAS MAURICE
VP,SO
S
$474,721
662
---
2/10/25
---
$717.10
102,301
-0.6
D
R
2/12/25 - 3:44:48 pm
47
1y
290
32%
18%
1
HSING MICHAEL
CEO,DIR
S
$1,860,157
2,594
---
2/10/25
---
$717.10
840,071
-0.3
D
R
2/12/25 - 3:44:10 pm
48
1y
138
20%
35%
1
BLEGEN THEODORE
VP,CFO
S
$381,498
532
---
2/10/25
---
$717.10
52,912
-1.0
D
R
2/12/25 - 3:43:39 pm
49
1y
290
32%
18%
1
HSING MICHAEL
CEO,DIR
S
$8,374,800
11,964
---
2/7/25
---
$700.00
842,665
-1.4
D
---
2/11/25 - 5:33:48 pm
50
1y
250
18%
29%
1
SCIAMMAS MAURICE
VP,SO
S
$4,913,852
7,000
---
2/7/25
$701.03
$704.91
16,015
-30.4
I
---
2/11/25 - 5:33:28 pm
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