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 JS
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Detailed Insider History for:
MONOLITHIC POWER SYSTEMS INC: MPWR
Price: 7/31/26 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
$1,426.03 $1,714.09 $774.14 $70,061 49 932 0.6% 6.7% 100.80% 3.64%
Exch Sector Industry Sub-Industry
NasdaqGS Manufacturing Electronic And Other Electrical Equipment And Components, Except Computer Equipment Semiconductors & Related Devices
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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
144
19%
36%
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
2
1y
144
19%
36%
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
3
    
 
SCIAMMAS MAURICE
VP,SO
JS
---
1,499
---
5/28/25
---
---
15,727
-8.7
I
---
5/30/25 - 4:32:48 pm
4
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
1,499
---
5/28/25
---
---
1,499
New
I
---
5/30/25 - 4:32:48 pm
5
1y
91
29%
27%
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
6
1y
91
29%
27%
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
7
1y
254
18%
30%
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
8
    
 
SCIAMMAS MAURICE
VP,SO
JS
---
1,878
---
5/9/25
---
---
17,226
-9.8
I
---
5/9/25 - 7:55:15 pm
9
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
1,878
---
5/9/25
---
---
40,094
4.9
I
---
5/9/25 - 7:55:15 pm
10
1y
91
29%
27%
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
11
    
 
SCIAMMAS MAURICE
VP,SO
JS
---
1,102
---
2/18/25
---
---
19,104
-5.5
I
---
2/20/25 - 7:02:07 pm
12
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
1,102
---
2/18/25
---
---
38,216
3.0
I
---
2/20/25 - 7:02:07 pm
13
1y
295
32%
19%
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
14
    
 
SCIAMMAS MAURICE
VP,SO
JS
---
5,050
---
2/11/25
---
---
10,899
-31.7
I
---
2/13/25 - 6:00:59 pm
15
    
 
SCIAMMAS MAURICE
VP,SO
JB
---
5,050
---
2/11/25
---
---
37,114
15.7
I
---
2/13/25 - 6:00:59 pm
16
1y
314
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
17
1y
197
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
18
1y
254
18%
30%
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
19
1y
295
32%
19%
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
20
1y
144
19%
36%
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
21
1y
295
32%
19%
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
22
1y
254
18%
30%
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
23
    
 
LEE VICTOR K
DIR
JB
---
335
---
2/4/25
---
---
29,567
1.1
D
R
2/6/25 - 3:58:49 pm
24
    
 
ELMIGER EUGEN J
DIR
JB
---
335
---
2/4/25
---
---
21,213
1.6
D
R
2/6/25 - 3:58:21 pm
25
    
 
CHANG KUO WEI HERBERT
DIR
JB
---
335
---
2/4/25
---
---
876
61.9
D
R
2/6/25 - 3:57:52 pm
26
    
 
MARTINEZ CARINTIA
DIR
JB
---
335
---
2/4/25
---
---
2,278
17.2
D
R
2/6/25 - 3:57:31 pm
27
    
 
ZHOU JEFF
DIR
JB
---
335
---
2/4/25
---
---
6,404
5.5
D
R
2/6/25 - 3:57:08 pm
28
    
 
WYNNE EILEEN
DIR
JB
---
335
---
2/4/25
---
---
1,153
41.0
D
R
2/6/25 - 3:56:39 pm
29
1y
295
32%
19%
1
HSING MICHAEL
CEO,DIR
S
$2,545,200
3,636
---
1/24/25
---
$700.00
854,629
-0.4
D
---
1/28/25 - 5:52:21 pm
30
1y
144
19%
36%
1
BLEGEN THEODORE
VP,CFO
S
$1,500,000
2,500
---
12/9/24
---
$600.00
53,444
-4.5
D
---
12/11/24 - 7:21:40 pm
31
1y
314
14%
33%
1
XIAO DEMING
VP,OO
S
$662,611
866
---
11/8/24
---
$765.14
162,239
-0.5
D
R
11/13/24 - 5:16:26 pm
32
1y
197
13%
38%
1
TSENG SARIA
VP,GC
S
$662,611
866
---
11/8/24
---
$765.14
159,640
-0.5
D
R
11/13/24 - 5:15:28 pm
33
1y
254
18%
30%
1
SCIAMMAS MAURICE
VP,SO
S
$662,611
866
---
11/8/24
---
$765.14
102,963
-0.8
D
R
11/13/24 - 5:14:30 pm
34
1y
144
19%
36%
1
BLEGEN THEODORE
VP,CFO
S
$561,620
734
---
11/8/24
---
$765.15
55,944
-1.3
D
R
11/13/24 - 5:13:31 pm
35
1y
295
32%
19%
1
HSING MICHAEL
CEO,DIR
S
$2,151,602
2,812
---
11/8/24
---
$765.15
858,265
-0.3
D
R
11/13/24 - 5:12:25 pm
36
1y
144
19%
36%
1
BLEGEN THEODORE
VP,CFO
S
$1,932,405
2,500
---
11/1/24
$764.54
$779.79
56,678
-4.2
D
---
11/5/24 - 5:31:31 pm
37
1y
254
18%
30%
1
SCIAMMAS MAURICE
VP,SO
S
$10,225,485
11,000
---
10/7/24
$922.72
$935.00
103,829
-9.6
D
---
10/8/24 - 1:14:04 pm
38
1y
144
19%
36%
1
BLEGEN THEODORE
VP,CFO
S
$2,270,901
2,500
---
10/1/24
$892.66
$925.12
59,178
-4.1
D
---
10/2/24 - 11:08:20 am
39
1y
144
19%
36%
1
BLEGEN THEODORE
VP,CFO
S
$2,260,506
2,500
---
9/3/24
$893.29
$919.73
61,678
-3.9
D
---
9/3/24 - 7:40:49 pm
40
    
 
MOYER JAMES C
DIR
JS
---
11,731
---
8/29/24
---
---
---
All
I
---
8/29/24 - 5:38:24 pm
41
1y
314
14%
33%
1
XIAO DEMING
VP,OO
S
$8,796,050
9,259
---
8/27/24
---
$950.00
20,455
-31.2
I
---
8/29/24 - 5:05:09 pm
42
1y
314
14%
33%
1
XIAO DEMING
VP,OO
S
$9,500,000
10,000
---
8/22/24
---
$950.00
29,714
-25.2
I
---
8/22/24 - 7:48:19 pm
43
    
 
XIAO DEMING
VP,OO
JS
---
8,968
---
8/22/24
---
---
163,105
-5.2
D
---
8/22/24 - 7:48:19 pm
44
    
 
XIAO DEMING
VP,OO
JB
---
8,968
---
8/22/24
---
---
39,714
29.2
I
---
8/22/24 - 7:48:19 pm
45
    
 
XIAO DEMING
VP,OO
JS
---
30,291
---
8/19/24
---
---
172,073
-15.0
D
---
8/21/24 - 4:28:49 pm
46
    
 
XIAO DEMING
VP,OO
JB
---
30,291
---
8/19/24
---
---
30,746
6,657.4
I
---
8/21/24 - 4:28:49 pm
47
1y
91
29%
27%
2
CHANG KUO WEI HERBERT
DIR
S
$178,688
200
---
8/15/24
$888.88
$898.00
541
-27.0
D
---
8/15/24 - 4:10:10 pm
48
    
 
MOYER JAMES C
DIR
JS
---
22,000
---
8/8/24
---
---
11,731
-65.2
I
---
8/12/24 - 6:09:18 pm
49
1y
314
14%
33%
1
XIAO DEMING
VP,OO
S
$668,637
859
---
8/8/24
---
$778.39
202,354
-0.4
D
R
8/12/24 - 2:41:11 pm
50
1y
197
13%
38%
1
TSENG SARIA
VP,GC
S
$668,637
859
---
8/8/24
---
$778.39
160,506
-0.5
D
R
8/12/24 - 2:40:07 pm
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