Monolithic Power Systems, Inc. (MPWR) has 13 known insider and institutional holders on record. The largest holder is Hsing Michael with 888,234 shares. Other notable holders include Xiao Deming and Tseng Saria.
Over the last 12 months, insiders have made 36 transactions in MPWR stock — 12 buys (valued at RSU Award) and 21 sells (valued at $183.52M). Insider selling has exceeded buying during this period.
MPWR Insider Ownership
Top Holder
Hsing Michael
888,234 shares
Buys (12 mo)
12
$0.00 value
Sells (12 mo)
21
$183.52M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Hsing Michael |
CEO |
888,234 |
2026-02-17 |
|
| 2 |
Xiao Deming |
EVP, Global Operations |
235,932 |
2026-02-10 |
|
| 3 |
Tseng Saria |
EVP & General Counsel |
173,582 |
2026-04-03 |
|
| 4 |
Blegen Theodore |
EVP and CFO |
82,353 |
2026-02-10 |
|
| 5 |
Lee Victor K |
Director |
27,756 |
2026-02-11 |
|
| 6 |
Elmiger Eugen J |
Director |
17,402 |
2026-02-05 |
|
| 7 |
Moyer James C |
Director |
11,731 |
2024-08-12 |
|
| 8 |
Zhou Jeff |
Director |
5,800 |
2026-02-05 |
|
| 9 |
Wynne Eileen |
Director |
1,342 |
2026-02-05 |
|
| 10 |
Sciammas Maurice |
EVP, Ww Sales & Marketing |
1,239 |
2026-04-03 |
|
| 11 |
Martinez Carintia |
Director |
1,067 |
2026-02-05 |
|
| 12 |
Chang Kuo Wei Herbert |
Director |
615 |
2026-02-05 |
|
| 13 |
Dean Robert W Ii |
Interim CFO |
65 |
2026-03-09 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-01 |
Sciammas Maurice |
EVP, Ww Sales & Marketing |
Informative Sell |
30 |
$1,116.44 |
$33.49K |
| 2026-04-01 |
Tseng Saria |
EVP & General Counsel |
Informative Sell |
292 |
$1,136.99 |
$332K |
| 2026-03-30 |
Tseng Saria |
EVP & General Counsel |
Informative Sell |
80 |
$1,041.12 |
$83.29K |
| 2026-03-20 |
Sciammas Maurice |
EVP, Ww Sales & Marketing |
Informative Sell |
30 |
$1,095.07 |
$32.85K |
| 2026-02-27 |
Dean Robert W Ii |
Interim CFO |
Unknown |
- |
- |
- |
| 2026-02-12 |
Hsing Michael |
CEO |
Informative Sell |
1,440 |
$1,217.12 |
$1.75M |
| 2026-02-11 |
Hsing Michael |
CEO |
Informative Sell |
649 |
$1,202.28 |
$780.28K |
| 2026-02-11 |
Sciammas Maurice |
EVP, Ww Sales & Marketing |
Informative Sell |
200 |
$1,179.97 |
$235.99K |
| 2026-02-10 |
Hsing Michael |
CEO |
Informative Sell |
280 |
$1,197.26 |
$335.23K |
| 2026-02-09 |
Lee Victor K |
Director |
Informative Sell |
400 |
$1,212.16 |
$484.86K |
| 2026-02-06 |
Blegen Theodore |
EVP and CFO |
Informative Sell |
21,725 |
$1,171.16 |
$25.44M |
| 2026-02-06 |
Sciammas Maurice |
EVP, Ww Sales & Marketing |
Informative Sell |
22,875 |
$1,171.16 |
$26.79M |
| 2026-02-06 |
Tseng Saria |
EVP & General Counsel |
Informative Sell |
22,875 |
$1,171.16 |
$26.79M |
| 2026-02-06 |
Hsing Michael |
CEO |
Informative Sell |
54,923 |
$1,171.16 |
$64.32M |
| 2026-02-06 |
Xiao Deming |
EVP, Global Operations |
Informative Sell |
22,875 |
$1,171.16 |
$26.79M |
| 2026-02-03 |
Martinez Carintia |
Director |
RSU Award |
189 |
- |
- |
| 2026-02-03 |
Wynne Eileen |
Director |
RSU Award |
189 |
- |
- |
| 2026-02-03 |
Elmiger Eugen J |
Director |
RSU Award |
189 |
- |
- |
| 2026-02-03 |
Zhou Jeff |
Director |
RSU Award |
189 |
- |
- |
| 2026-02-03 |
Blegen Theodore |
EVP and CFO |
RSU Award |
38,745 |
- |
- |
| 2026-02-03 |
Sciammas Maurice |
EVP, Ww Sales & Marketing |
RSU Award |
57,170 |
- |
- |
| 2026-02-03 |
Tseng Saria |
EVP & General Counsel |
RSU Award |
57,170 |
- |
- |
| 2026-02-03 |
Hsing Michael |
CEO |
RSU Award |
136,825 |
- |
- |
| 2026-02-03 |
Xiao Deming |
EVP, Global Operations |
RSU Award |
57,170 |
- |
- |
| 2026-02-03 |
Lee Victor K |
Director |
RSU Award |
189 |
- |
- |
