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Detailed Insider History for:
MONOLITHIC POWER SYSTEMS INC: MPWR
Price: 2/6/26 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
$1,229.82 $1,250.00 $438.86 $59,903 49 694 0.7% 5.7% 102.13% 3.68%
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
1y
15
7%
33%
1
LEE VICTOR K
DIR
AS
$484,864
400
---
2/9/26
---
$1,212.16
27,756
-1.4
D
10b
2/11/26 - 6:44:43 pm
2
1y
313
14%
33%
1
XIAO DEMING
VP,OO
S
$26,790,370
22,875
---
2/6/26
---
$1,171.16
235,932
-8.8
D
R
2/10/26 - 6:59:14 pm
3
1y
197
13%
38%
1
TSENG SARIA
VP,GC
S
$26,790,370
22,875
---
2/6/26
---
$1,171.16
200,626
-10.2
D
R
2/10/26 - 6:58:30 pm
4
1y
253
18%
29%
1
SCIAMMAS MAURICE
VP,SO
S
$26,790,370
22,875
---
2/6/26
---
$1,171.16
178,625
-11.4
D
R
2/10/26 - 6:57:53 pm
5
1y
142
20%
35%
1
BLEGEN THEODORE
VP,CFO
S
$25,443,532
21,725
---
2/6/26
---
$1,171.16
82,353
-20.9
D
R
2/10/26 - 6:57:08 pm
6
1y
294
32%
19%
1
HSING MICHAEL
CEO,DIR
S
$64,323,824
54,923
---
2/6/26
---
$1,171.16
988,234
-5.3
D
R
2/10/26 - 6:56:26 pm
7
    
 
WYNNE EILEEN
DIR
JB
---
189
---
2/3/26
---
---
1,342
16.4
D
R
2/5/26 - 8:04:59 pm
8
    
 
ZHOU JEFF
DIR
JB
---
189
---
2/3/26
---
---
5,800
3.4
D
R
2/5/26 - 8:03:28 pm
9
    
 
CHANG KUO WEI HERBERT
DIR
JB
---
189
---
2/3/26
---
---
615
44.4
D
R
2/5/26 - 8:01:11 pm
10
    
 
ELMIGER EUGEN J
DIR
JB
---
189
---
2/3/26
---
---
17,402
1.1
D
R
2/5/26 - 8:00:07 pm
11
    
 
LEE VICTOR K
DIR
JB
---
189
---
2/3/26
---
---
28,156
0.7
D
R
2/5/26 - 7:56:34 pm
12
    
 
MARTINEZ CARINTIA
DIR
JB
---
189
---
2/3/26
---
---
1,067
21.5
D
R
2/5/26 - 7:39:04 pm
13
    
 
XIAO DEMING
VP,OO
JB
---
57,170
---
2/3/26
---
---
258,807
28.4
D
R
2/5/26 - 7:36:09 pm
14
    
 
BLEGEN THEODORE
VP,CFO
JB
---
38,745
---
2/3/26
---
---
104,078
59.3
D
R
2/5/26 - 7:35:27 pm
15
    
 
TSENG SARIA
VP,GC
JB
---
57,170
---
2/3/26
---
---
223,501
34.4
D
R
2/5/26 - 7:29:56 pm
16
    
 
HSING MICHAEL
CEO,DIR
JB
---
136,825
---
2/3/26
---
---
1,043,157
15.1
D
R
2/5/26 - 7:07:34 pm
17
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
57,170
---
2/3/26
---
---
201,500
39.6
D
R
2/5/26 - 6:56:35 pm
18
1y
142
20%
35%
1
BLEGEN THEODORE
VP,CFO
AS
$3,389,266
3,000
---
2/2/26
$1,110.58
$1,139.49
65,333
-4.4
D
10b
2/4/26 - 10:10:11 am
19
1y
15
7%
33%
1
LEE VICTOR K
DIR
AS
$558,516
600
---
1/2/26
---
$930.86
27,967
-2.1
D
10b
1/6/26 - 6:25:24 pm
20
1y
142
20%
35%
1
BLEGEN THEODORE
VP,CFO
AS
$2,821,400
3,000
---
1/2/26
$927.61
$946.62
68,332
-4.2
D
10b
1/6/26 - 4:33:18 pm
21
    
 
TSENG SARIA
VP,GC
JS
---
1,000
---
12/24/25
---
---
166,331
-0.6
D
---
12/30/25 - 6:08:47 pm
22
    
 
TSENG SARIA
VP,GC
JB
---
1,000
---
12/24/25
---
---
1,000
New
I
---
12/30/25 - 6:08:47 pm
23
1y
15
7%
33%
1
LEE VICTOR K
DIR
AS
$951,719
1,000
---
12/24/25
$949.70
$955.08
28,567
-3.4
D
10b
12/29/25 - 10:31:28 am
24
    
 
HSING MICHAEL
CEO,DIR
JS
---
12,337
---
12/9/25
---
---
906,332
-1.3
D
---
12/11/25 - 4:03:37 pm
25
1y
142
20%
35%
1
BLEGEN THEODORE
VP,CFO
AS
$2,724,624
3,000
---
12/1/25
$899.73
$911.59
71,332
-4.0
D
10b
12/2/25 - 7:52:27 pm
26
1y
197
13%
38%
1
TSENG SARIA
VP,GC
S
$18,529,316
20,000
---
11/26/25
$922.78
$930.48
167,331
-10.7
D
---
11/28/25 - 10:19:51 am
27
1y
197
13%
38%
1
TSENG SARIA
VP,GC
S
$18,083,638
20,000
---
11/25/25
$894.54
$912.30
187,331
-9.6
D
---
11/28/25 - 10:15:00 am
28
1y
88
30%
24%
2
CHANG KUO WEI HERBERT
DIR
S
$89,697
100
---
11/25/25
---
$896.97
426
-19.0
D
---
11/25/25 - 4:54:15 pm
29
1y
253
18%
29%
1
SCIAMMAS MAURICE
VP,SO
S
$3,559,435
3,976
---
11/24/25
---
$895.23
144,330
-2.7
D
---
11/25/25 - 4:31:18 pm
30
1y
88
30%
24%
2
CHANG KUO WEI HERBERT
DIR
S
$87,397
100
---
11/21/25
---
$873.97
526
-16.0
D
---
11/24/25 - 11:25:40 am
31
1y
253
18%
29%
1
SCIAMMAS MAURICE
VP,SO
S
$24,656,386
27,966
---
11/19/25
$875.26
$886.01
148,306
-15.9
D
---
11/20/25 - 4:48:00 pm
32
1y
253
18%
29%
1
SCIAMMAS MAURICE
VP,SO
S
$6,121,059
7,034
---
11/19/25
$862.58
$874.50
176,272
-3.8
D
---
11/20/25 - 4:47:14 pm
33
    
 
SCIAMMAS MAURICE
VP,SO
JS
---
4,530
---
11/13/25
---
---
26,660
-14.5
I
---
11/14/25 - 6:31:09 pm
34
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
4,530
---
11/13/25
---
---
49,460
10.1
I
---
11/14/25 - 6:31:09 pm
35
1y
294
32%
19%
1
HSING MICHAEL
CEO,DIR
S
$35,724,380
37,000
---
11/12/25
$957.58
$980.06
918,669
-3.9
D
---
11/13/25 - 4:15:33 pm
36
1y
294
32%
19%
1
HSING MICHAEL
CEO,DIR
S
$38,335,720
40,000
---
11/11/25
$951.69
$967.15
955,669
-4.0
D
---
11/13/25 - 4:14:51 pm
37
1y
253
18%
29%
1
SCIAMMAS MAURICE
VP,SO
S
$197,362
200
---
11/5/25
---
$986.81
1,299
-13.3
I
---
11/6/25 - 6:53:27 pm
38
1y
142
20%
35%
1
BLEGEN THEODORE
VP,CFO
AS
$3,073,278
3,000
---
11/3/25
$1,013.62
$1,038.41
74,332
-3.9
D
10b
11/4/25 - 7:31:34 pm
39
    
 
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
40
    
 
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
41
    
 
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
42
    
 
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
43
    
 
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
44
    
 
TSENG SARIA
VP,GC
JB
---
135,520
---
10/25/25
---
---
261,874
107.3
D
R
10/28/25 - 9:38:53 pm
45
    
 
BLEGEN THEODORE
VP,CFO
JB
---
87,690
---
10/25/25
---
---
125,630
231.1
D
R
10/28/25 - 9:38:17 pm
46
    
 
HSING MICHAEL
CEO,DIR
JB
---
302,920
---
10/25/25
---
---
1,117,587
37.2
D
R
10/28/25 - 9:37:20 pm
47
    
 
XIAO DEMING
VP,OO
JB
---
135,520
---
10/25/25
---
---
256,180
112.3
D
R
10/28/25 - 9:36:16 pm
48
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
135,520
---
10/25/25
---
---
237,849
132.4
D
R
10/28/25 - 9:35:34 pm
49
1y
197
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
50
1y
197
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
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