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 B  AB  JB*  OB  OE*  OE
 S  AS  JS*  OS  OS*  3
 JB
 JS
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Detailed Insider History for:
MONOLITHIC POWER SYSTEMS INC: MPWR
Price: 5/17/13 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
$24.13 $25.66 $17.07 $887 37 292 0.0% 11.3% 98.04% 6.08%
Exch Sector Industry Sub-Industry
NASD Manufacturing Electronic And Other Electrical Equipment And Components, Except Computer Equipment Semiconductors & Related Devices
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#:
View Form:
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
MOYER JAMES C
DIR
AS
$78,222
3,200
5/14/13
5/15/13
$24.43
$24.46
427,683
-0.7
I
10b
5/16/13 - 7:55:41 pm
2
SCIAMMAS MAURICE
VP,SO
S
$59,723
2,474
5/7/13
5/8/13
---
$24.10
111,364
-2.2
D
R
5/8/13 - 8:28:23 pm
3
SCIAMMAS MAURICE
VP,SO
JB
---
151
---
5/8/13
---
---
111,515
0.1
D
R
5/8/13 - 8:28:23 pm
4
XIAO DEMING
PR,OO
OS
$73,739
3,055
5/7/13
5/8/13
---
$24.10
114,139
-2.6
D
R
5/8/13 - 8:24:36 pm
5
XIAO DEMING
PR,OO
JB
---
192
---
5/8/13
---
---
114,331
0.2
D
R
5/8/13 - 8:24:36 pm
6
TSENG SARIA
VP,GC
OS
$294,593
12,114
5/6/13
5/8/13
---
$24.10
80,907
-13.0
D
R
5/8/13 - 8:22:40 pm
7
TSENG SARIA
VP,GC
JB
---
151
---
5/8/13
---
---
81,058
0.2
D
R
5/8/13 - 8:22:40 pm
8
RAO MEERA
CFO
S
$36,715
1,521
5/7/13
5/8/13
---
$24.10
92,240
-1.6
D
R
5/8/13 - 8:20:10 pm
9
RAO MEERA
CFO
JB
---
131
---
5/8/13
---
---
92,371
0.1
D
R
5/8/13 - 8:20:10 pm
10
HSING MICHAEL
CEO,DIR
S
$177,309
7,345
5/7/13
5/8/13
---
$24.10
584,912
-1.2
D
R
5/8/13 - 8:18:51 pm
11
HSING MICHAEL
CEO,DIR
JB
---
449
---
5/8/13
---
---
585,361
0.1
D
R
5/8/13 - 8:18:51 pm
12
XIAO DEMING
PR,OO
OS
$6,036
249
---
5/7/13
---
$24.24
12,338
-2.0
I
R
5/8/13 - 8:24:36 pm
13
TSENG SARIA
VP,GC
OE
$78,929
10,331
---
5/6/13
---
$7.64
91,292
12.8
D
R
5/8/13 - 8:22:40 pm
14
XIAO DEMING
PR,OO
OS
$1,748,530
72,309
5/2/13
5/3/13
$23.17
$24.21
117,082
-38.2
D
R
5/6/13 - 8:51:26 pm
15
XIAO DEMING
PR,OO
JB
---
196
5/2/13
5/3/13
---
---
117,438
0.2
D
R
5/6/13 - 8:51:26 pm
16
XIAO DEMING
PR,OO
OE
$791,700
70,000
---
5/3/13
---
$11.31
187,092
59.8
D
R
5/6/13 - 8:51:26 pm
17
TSENG SARIA
VP,GC
S
$30,891
1,318
5/2/13
5/3/13
$23.17
$24.18
82,608
-1.6
D
R
5/6/13 - 8:51:13 pm
18
TSENG SARIA
VP,GC
JB
---
156
5/2/13
5/3/13
---
---
82,985
0.2
D
R
5/6/13 - 8:51:13 pm
19
SCIAMMAS MAURICE
VP,SO
OS
$41,964
1,796
5/2/13
5/3/13
$23.17
$24.18
113,745
-1.6
D
R
5/6/13 - 8:51:02 pm
20
SCIAMMAS MAURICE
VP,SO
JB
---
173
5/2/13
5/3/13
---
---
114,151
0.2
D
R
5/6/13 - 8:51:02 pm
21
RAO MEERA
CFO
S
$35,687
1,537
5/2/13
5/3/13
$23.17
$24.18
93,667
-1.6
D
R
5/6/13 - 8:50:50 pm
22
RAO MEERA
CFO
JB
---
182
5/2/13
5/3/13
---
---
93,840
0.2
D
R
5/6/13 - 8:50:50 pm
23
HSING MICHAEL
CEO,DIR
S
$20,795
860
---
5/3/13
---
$24.18
591,985
-0.1
D
R
5/6/13 - 8:50:39 pm
24
HSING MICHAEL
CEO,DIR
JB
---
74
---
5/3/13
---
---
592,059
0.0
D
R
5/6/13 - 8:50:39 pm
25
MOYER JAMES C
DIR
AS
$76,782
3,200
5/2/13
5/3/13
$23.76
$24.23
430,883
-0.7
I
10b
5/6/13 - 8:50:28 pm
26
MOYER JAMES C
DIR
AS
$70,908
3,200
4/15/13
4/16/13
$22.15
$22.17
434,083
-0.7
I
10b
4/17/13 - 6:50:38 pm
27
XIAO DEMING
PR,OO
OS
$2,251
101
---
4/5/13
---
$22.29
12,587
-0.8
I
R
4/8/13 - 9:10:07 pm
28
SCIAMMAS MAURICE
VP,SO
OS
$810,520
35,895
---
4/4/13
---
$22.58
150,148
-19.3
D
10b
4/8/13 - 9:09:54 pm
29
SCIAMMAS MAURICE
VP,SO
OE
$319,466
35,895
---
4/4/13
---
$8.90
186,043
23.9
D
10b
4/8/13 - 9:09:54 pm
30
MOYER JAMES C
DIR
AS
$74,284
3,200
---
4/3/13
---
$22.94
437,283
-0.7
I
10b
4/3/13 - 8:37:38 pm
31
TSENG SARIA
VP,GC
AS
$27,003
1,161
---
4/2/13
---
$23.26
118,562
-1.0
D
10b
4/3/13 - 8:37:28 pm
32
MOYER JAMES C
DIR
AS
$76,988
3,200
3/20/13
3/21/13
---
$23.88
440,483
-0.7
I
10b
3/21/13 - 6:35:11 pm
33
XIAO DEMING
PR,OO
OS*
$3,709
151
---
3/14/13
---
$24.56
12,679
-1.2
I
R
3/18/13 - 9:20:55 pm
34
XIAO DEMING
PR,OO
JB
---
17
---
3/14/13
---
---
12,696
0.1
I
R
3/18/13 - 9:20:55 pm
35
MOYER JAMES C
DIR
AS
$78,117
3,200
3/4/13
3/5/13
---
$24.39
443,683
-0.7
I
10b
3/5/13 - 6:16:13 pm
36
TSENG SARIA
VP,GC
OS*
$890
36
---
2/28/13
---
$24.72
119,723
-0.0
D
---
3/4/13 - 9:12:24 pm
37
LEE VICTOR K
DIR
OS
$123,750
5,000
---
2/28/13
---
$24.75
14,589
-25.5
D
---
3/4/13 - 9:10:37 pm
38
LEE VICTOR K
DIR
OE
$46,200
5,000
---
2/28/13
---
$9.24
19,589
34.3
D
---
3/4/13 - 9:10:37 pm
39
CHANG KUO WEI HERBERT
DIR
OS
$255,665
10,299
2/27/13
2/28/13
---
$24.80
91,262
-10.1
D
---
3/1/13 - 7:52:33 pm
40
CHANG KUO WEI HERBERT
DIR
OE
$221,241
10,299
2/27/13
2/28/13
$19.29
$22.01
96,262
12.0
D
---
3/1/13 - 7:52:33 pm
41
MCBURNIE DOUGLAS M
DIR
OS
$742,275
30,062
---
2/22/13
$24.67
$24.70
4,027
-88.2
D
---
2/25/13 - 6:11:44 pm
42
MCBURNIE DOUGLAS M
DIR
OE
$321,500
25,000
---
2/22/13
---
$12.86
29,027
620.8
D
---
2/25/13 - 6:11:44 pm
43
MOYER JAMES C
DIR
AS
$79,223
3,200
2/21/13
2/22/13
---
$24.70
446,883
-0.7
I
10b
2/22/13 - 8:18:00 pm
44
XIAO DEMING
PR,OO
OS
$81,909
3,207
---
2/20/13
$25.52
$25.54
155,392
-2.0
D
R
2/22/13 - 8:18:20 pm
45
XIAO DEMING
PR,OO
OE
$1,091
100
---
2/20/13
---
$10.91
158,599
0.1
D
R
2/22/13 - 8:18:20 pm
46
XIAO DEMING
PR,OO
JB
$21,246
1,188
---
2/15/13
---
$17.88
158,499
0.8
D
R
2/22/13 - 8:18:20 pm
47
XIAO DEMING
PR,OO
JB
$5,455
305
---
2/15/13
---
$17.88
12,822
2.4
I
R
2/22/13 - 8:18:20 pm
48
TSENG SARIA
VP,GC
JB
$21,407
1,197
---
2/15/13
---
$17.88
119,759
1.0
D
---
2/20/13 - 7:52:28 pm
49
HSING MICHAEL
CEO,DIR
JB
$14,468
809
---
2/15/13
---
$17.88
687,031
0.1
D
---
2/20/13 - 7:52:14 pm
50
ZHOU JEFF
DIR
S
$37,497
1,500
---
2/12/13
---
$25.00
11,289
-11.7
D
R
2/13/13 - 9:59:06 pm
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