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Detailed Insider History for:
MONOLITHIC POWER SYSTEMS INC: MPWR
Price: 2/25/21 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
$362.59 $406.75 $130.12 $16,352 45 658 0.7% 2.0% 95.81% 5.51%
Exch Sector Industry Sub-Industry
NASD 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
239
11%
34%
1
XIAO DEMING
PR,OO
S
$1,122,000
3,000
---
2/26/21
---
$374.00
328,847
-0.9
D
---
2/26/21 - 5:55:55 pm
2
1y
70
30%
21%
2
CHANG KUO WEI HERBERT
DIR
S
$111,000
300
---
2/26/21
---
$370.00
1,281
-19.0
D
---
2/26/21 - 5:55:42 pm
3
1y
239
11%
34%
1
XIAO DEMING
PR,OO
S
$383,470
1,000
---
2/24/21
---
$383.47
331,847
-0.3
D
---
2/25/21 - 4:10:38 pm
4
1y
188
18%
28%
1
SCIAMMAS MAURICE
VP,SO
AS
$65,348
172
---
2/19/21
---
$379.93
1,203
-12.5
I
10b
2/23/21 - 6:08:39 pm
5
1y
51
8%
50%
1
BLEGEN THEODORE
CFO
AS
$1,663,659
4,299
---
2/19/21
$379.93
$393.44
158,899
-2.6
D
10b
2/23/21 - 6:08:09 pm
6
1y
132
8%
40%
1
TSENG SARIA
VP,GC
S
$8,321,778
22,026
---
2/17/21
$372.78
$384.23
271,517
-7.5
D
---
2/19/21 - 4:38:44 pm
7
    
 
BLEGEN THEODORE
CFO
JB
$21,286
89
---
2/16/21
---
$239.17
163,198
0.1
D
10b
2/23/21 - 6:08:09 pm
8
1y
188
18%
28%
1
SCIAMMAS MAURICE
VP,SO
S
$4,281,591
11,000
---
2/16/21
$387.34
$393.99
333,126
-3.2
D
---
2/17/21 - 5:45:21 pm
9
    
 
SCIAMMAS MAURICE
VP,SO
JB
$21,286
89
---
2/16/21
---
$239.17
333,215
0.0
D
---
2/17/21 - 5:45:21 pm
10
1y
239
11%
34%
1
XIAO DEMING
PR,OO
S
$1,990,000
5,000
---
2/16/21
---
$398.00
332,847
-1.5
D
---
2/17/21 - 5:40:10 pm
11
1y
10
0%
56%
1
ZHOU JEFF
DIR
S
$77,600
200
---
2/12/21
---
$388.00
11,509
-1.7
D
---
2/16/21 - 8:25:34 pm
12
1y
188
18%
28%
1
SCIAMMAS MAURICE
VP,SO
S
$1,900,321
5,000
---
2/11/21
$376.40
$383.81
344,126
-1.4
D
---
2/12/21 - 6:53:27 pm
13
1y
216
33%
17%
1
HSING MICHAEL
CEO,DIR
AS
$7,156,466
19,067
---
2/10/21
$371.92
$381.68
1,091,903
-1.7
D
10b
2/12/21 - 6:10:10 pm
14
1y
188
18%
28%
1
SCIAMMAS MAURICE
VP,SO
AS
$7,699,468
20,535
---
2/9/21
$366.81
$382.46
1,375
-93.7
I
10b
2/11/21 - 6:22:04 pm
15
1y
233
38%
15%
1
MOYER JAMES C
DIR
AS
$5,613,387
15,000
---
2/9/21
$367.50
$381.79
233,841
-6.0
D
10b
2/11/21 - 5:46:13 pm
16
1y
239
11%
34%
1
XIAO DEMING
PR,OO
S
$1,525,874
4,092
---
2/9/21
---
$372.89
337,847
-1.2
D
R
2/9/21 - 7:07:15 pm
17
1y
132
8%
40%
1
TSENG SARIA
VP,GC
S
$1,525,874
4,092
---
2/9/21
---
$372.89
293,543
-1.4
D
R
2/9/21 - 7:06:58 pm
18
1y
188
18%
28%
1
SCIAMMAS MAURICE
VP,SO
S
$1,848,053
4,956
---
2/9/21
---
$372.89
349,126
-1.4
D
R
2/9/21 - 7:06:50 pm
19
1y
216
33%
17%
1
HSING MICHAEL
CEO,DIR
S
$5,555,718
14,899
---
2/9/21
---
$372.89
1,110,970
-1.3
D
R
2/9/21 - 7:06:31 pm
20
1y
51
8%
50%
1
BLEGEN THEODORE
CFO
S
$1,089,590
2,922
---
2/9/21
---
$372.89
163,109
-1.8
D
R
2/9/21 - 7:06:08 pm
21
1y
239
11%
34%
1
XIAO DEMING
PR,OO
S
$4,893,915
13,359
---
2/5/21
---
$366.34
341,939
-3.8
D
R
2/9/21 - 7:07:15 pm
22
1y
132
8%
40%
1
TSENG SARIA
VP,GC
S
$4,893,549
13,358
---
2/5/21
---
$366.34
297,635
-4.3
D
R
2/9/21 - 7:06:58 pm
23
1y
188
18%
28%
1
SCIAMMAS MAURICE
VP,SO
S
$5,815,622
15,875
---
2/5/21
---
$366.34
354,082
-4.3
D
R
2/9/21 - 7:06:50 pm
24
1y
216
33%
17%
1
HSING MICHAEL
CEO,DIR
S
$19,316,658
52,729
---
2/5/21
---
$366.34
1,125,869
-4.5
D
R
2/9/21 - 7:06:31 pm
25
1y
51
8%
50%
1
BLEGEN THEODORE
CFO
S
$4,033,386
11,010
---
2/5/21
---
$366.34
166,031
-6.2
D
R
2/9/21 - 7:06:08 pm
26
    
 
ZHOU JEFF
DIR
JB
---
533
---
2/2/21
---
---
11,709
4.8
D
R
2/4/21 - 7:53:50 pm
27
    
 
XIAO DEMING
PR,OO
JB
$1,805,580
92,351
---
2/2/21
---
$30.00
355,298
35.1
D
R
2/4/21 - 7:53:35 pm
28
    
 
TSENG SARIA
VP,GC
JB
$1,805,580
92,351
---
2/2/21
---
$30.00
310,993
42.2
D
R
2/4/21 - 7:53:24 pm
29
    
 
SCIAMMAS MAURICE
VP,SO
JB
$1,805,580
92,351
---
2/2/21
---
$30.00
369,957
33.3
D
R
2/4/21 - 7:53:08 pm
30
    
 
MOYER JAMES C
DIR
JB
---
533
---
2/2/21
---
---
248,841
0.2
D
R
2/4/21 - 7:52:50 pm
31
    
 
LEE VICTOR K
DIR
JB
---
533
---
2/2/21
---
---
28,872
1.9
D
R
2/4/21 - 7:52:32 pm
32
    
 
HSING MICHAEL
CEO,DIR
JB
$6,973,290
328,943
---
2/2/21
---
$30.00
1,178,598
38.7
D
R
2/4/21 - 7:52:23 pm
33
    
 
ELMIGER EUGEN J
DIR
JB
---
533
---
2/2/21
---
---
19,518
2.8
D
R
2/4/21 - 7:52:06 pm
34
    
 
CHANG KUO WEI HERBERT
DIR
JB
---
533
---
2/2/21
---
---
1,581
50.9
D
R
2/4/21 - 7:51:46 pm
35
    
 
BLEGEN THEODORE
CFO
JB
$1,235,880
61,301
---
2/2/21
---
$30.00
177,041
53.0
D
R
2/4/21 - 7:51:36 pm
36
1y
51
8%
50%
1
BLEGEN THEODORE
CFO
AS
$761,871
1,919
---
1/20/21
$395.05
$400.16
115,740
-1.6
D
10b
1/22/21 - 4:13:12 pm
37
1y
132
8%
40%
1
TSENG SARIA
VP,GC
AS
$8,461,107
21,730
---
1/14/21
$385.69
$392.63
218,642
-9.0
D
10b
1/19/21 - 6:36:27 pm
38
1y
188
18%
28%
1
SCIAMMAS MAURICE
VP,SO
AS
$8,461,977
23,090
---
1/6/21
$358.02
$376.49
21,910
-51.3
I
10b
1/7/21 - 4:27:41 pm
39
1y
216
33%
17%
1
HSING MICHAEL
CEO,DIR
AS
$16,448,819
44,784
---
1/5/21
$361.87
$370.51
849,655
-5.0
D
10b
1/6/21 - 4:52:21 pm
40
1y
216
33%
17%
1
HSING MICHAEL
CEO,DIR
AS
$16,448,819
44,784
---
1/5/21
$361.87
$370.51
849,655
-5.0
D
10b
1/6/21 - 4:52:21 pm
41
1y
51
8%
50%
1
BLEGEN THEODORE
CFO
S
$333,276
905
---
1/4/21
---
$368.26
117,659
-0.8
D
R
1/5/21 - 5:50:45 pm
42
1y
188
18%
28%
1
SCIAMMAS MAURICE
VP,SO
S
$1,960,990
5,325
---
1/4/21
---
$368.26
277,606
-1.9
D
R
1/5/21 - 5:49:51 pm
43
1y
216
33%
17%
1
HSING MICHAEL
CEO,DIR
S
$4,036,142
10,960
---
1/4/21
---
$368.26
894,439
-1.2
D
R
1/5/21 - 5:49:39 pm
44
1y
132
8%
40%
1
TSENG SARIA
VP,GC
S
$1,585,364
4,305
---
1/4/21
---
$368.26
240,372
-1.8
D
R
1/5/21 - 5:49:25 pm
45
1y
239
11%
34%
1
XIAO DEMING
PR,OO
S
$1,585,364
4,305
---
1/4/21
---
$368.26
262,947
-1.6
D
R
1/5/21 - 5:48:54 pm
46
    
 
HSING MICHAEL
CEO,DIR
JS
---
12,825
---
12/29/20
---
---
905,399
-1.4
D
---
12/31/20 - 4:17:53 pm
47
    
 
HSING MICHAEL
CEO,DIR
JB
---
12,825
---
12/29/20
---
---
12,825
New
I
---
12/31/20 - 4:17:53 pm
48
1y
51
8%
50%
1
BLEGEN THEODORE
CFO
AS
$491,362
1,418
---
12/21/20
$343.96
$348.76
118,564
-1.2
D
10b
12/22/20 - 5:52:46 pm
49
1y
233
38%
15%
1
MOYER JAMES C
DIR
AS
$4,810,467
15,000
---
12/8/20
$318.53
$324.72
248,308
-5.7
D
10b
12/10/20 - 4:23:35 pm
50
1y
51
8%
50%
1
BLEGEN THEODORE
CFO
AS
$439,585
1,420
---
11/19/20
---
$309.57
119,982
-1.2
D
10b
11/23/20 - 4:01:57 pm
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