Monolithic Power Systems, Inc.
MPWR- Exchange
- Nasdaq
- Industry
- Semiconductors & Related Devices
- SEC CIK
- 0001280452
In the last 90 days, Monolithic Power Systems, Inc. insiders filed 0 open-market purchases and 8 sales; 1,250 institutions reported holding it in 13F filings for Q2 2026, worth $65.6B in total; superinvestors D1 Capital Partners and Maverick Capital hold it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Monolithic Power Systems, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 0 filings
- Open-market sells
- 8 filings
- 3 insiders, $20.7M in total
- Insiders trading
- 3
- Net value
- −$20.7M
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Monolithic Power Systems, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Tseng Saria | EVP & General Counsel | 2,000Indirect | Sep 2, 2026 | 16 |
| Dean Robert W II | Interim CFO | 7,089 | Aug 26, 2026 | 7 |
| Chang Kuo Wei Herbert | Director | 515 | Aug 25, 2026 | 5 |
| Sciammas Maurice | EVP, WW Sales & Marketing | 36,062Indirect | Aug 6, 2026 | 22 |
| Zhou Jeff | Director | 3,800 | May 27, 2026 | 3 |
| Hsing Michael | CEO | 848,263 | May 20, 2026 | 11 |
| Xiao Deming | EVP, Global Operations | 205,959 | May 8, 2026 | 5 |
| Elmiger Eugen J | Director | 5,402 | May 8, 2026 | 2 |
| Wynne Eileen | Director | 1,007 | May 8, 2026 | 2 |
| Lee Victor K | Director | 27,756 | Feb 11, 2026 | 4 |
| Blegen Theodore | EVP and CFO | 82,353 | Feb 10, 2026 | 9 |
| Martinez Carintia | Director | 1,067 | Feb 5, 2026 | 1 |
| Moyer James C | Director | 0Indirect | Aug 29, 2024 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 10, 2021 (view filing) | Aug 6 | 4 days | Moyer James CDirector | SSale | −7.00K | $460.87 | −$3.23M | −9.5%66.8K after | 3 lots |
| Aug 5, 2021 (view filing) | Aug 4 | 1 day | Zhou JeffDirector | SSale | −400 | $465.22 | −$186.1K | −6.1%6.11K after | |
| Aug 4, 2021 (view filing) | Aug 2 | 2 days | Xiao DemingPres. of MPS Asia Operations | SSale | −6.50K | $455.09 | −$2.96M | −2.1%307.4K after | 4 lots |
| Jul 26, 2021 (view filing) | Jul 23 | 3 days | Zhou JeffDirector | SSale | −500 | $410.00 | −$205.0K | −7.1%6.51K after | |
| Jul 21, 2021 (view filing) | Jul 21 | Same day | Zhou JeffDirector | SSale | −1.00K | $402.51 | −$402.5K | −12.5%7.01K after | 2 lots |
| Jul 21, 2021 (view filing) | Jul 20 | 1 day | Blegen TheodoreCFO | SSale | −1.90K | $382.77 | −$726.1K | −1.3%145.9K after | |
| Jul 16, 2021 (view filing) | Jul 16 | Same day | Moyer James CDirector | SSale | −12.0K | $381.41 | −$4.58M | −4.9%233.8K after | 5 lots |
| Jul 16, 2021 (view filing) | Jul 14 | 2 days | Zhou JeffDirector | SSale | −1.00K | $392.66 | −$392.7K | −11.1%8.01K after | 2 lots |
| Jul 8, 2021 (view filing) | Jul 7 | 1 day | Zhou JeffDirector | SSale | −500 | $387.27 | −$193.6K | −5.3%9.01K after | |
| Jul 6, 2021 (view filing) | Jul 6 | Same day | Zhou JeffDirector | SSale | −500 | $380.00 | −$190.0K | −5.0%9.51K after | |
| Jul 6, 2021 (view filing) | Jul 6 | Same day | Xiao DemingPres. of MPS Asia Operations | SSale | −7.73K | $380.00 | −$2.94M | −2.4%309.0K after | |
| Jul 6, 2021 (view filing) | Jul 1 | 5 days | Sciammas MauriceSr. V.P.of Sales and Marketing | SSale | −4.30K | $370.45 | −$1.59M | −1.5%284.0K after | |
| Jul 6, 2021 (view filing) | Jul 1 | 5 days | Blegen TheodoreCFO | SSale | −905 | $370.45 | −$335.3K | −0.6%147.8K after | |
| Jul 6, 2021 (view filing) | Jul 1 | 5 days | Hsing MichaelCEO | SSale | −11.0K | $370.45 | −$4.06M | −1.1%1.00M after | |
| Jul 6, 2021 (view filing) | Jul 1 | 5 days | Xiao DemingPres. of MPS Asia Operations | SSale | −4.30K | $370.45 | −$1.59M | −1.3%316.8K after | |
| Jul 6, 2021 (view filing) | Jul 1 | 5 days | Tseng SariaVP & General Counsel | SSale | −4.30K | $370.45 | −$1.59M | −1.6%262.6K after |