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 |
|---|---|---|---|---|---|---|---|---|---|
| May 19, 2026 (view filing) | May 15 | 4 days | Sciammas MauriceEVP, WW Sales & Marketing | SSale | −12.0K | $1,561.40 | −$18.7M | −6.7%166.6K after | 8 lots10b5-1 |
| May 20, 2026 (view filing) | May 18 | 2 days | Dean Robert W IIInterim CFO | SSale | −4 | $1,563.28 | −$6.25K | −0.1%5.90K after | |
| May 20, 2026 (view filing) | May 18 | 2 days | Hsing MichaelCEO | SSale | −40.0K | $1,482.75 | −$59.3M | −4.5%848.3K after | 13 lots |
| May 27, 2026 (view filing) | May 22 | 5 days | Tseng SariaEVP & General Counsel | SSale | −5.00K | $1,586.43 | −$7.93M | −3.2%151.8K after | |
| May 27, 2026 (view filing) | May 26 | 1 day | Zhou JeffDirector | SSale | −486 | $1,680.00 | −$816.5K | −11.3%3.80K after | |
| May 28, 2026 (view filing) | May 26 | 2 days | Dean Robert W IIInterim CFO | SSale | −22 | $1,649.56 | −$36.3K | −0.4%5.88K after | |
| May 29, 2026 (view filing) | May 27 | 2 days | Tseng SariaEVP & General Counsel | SSale | −7.57K | $1,700.00 | −$12.9M | −5.0%144.2K after | |
| Jun 3, 2026 (view filing) | Jun 1 | 2 days | Sciammas MauriceEVP, WW Sales & Marketing | SSale | −30 | $1,533.95 | −$46.0K | −2.5%1.18K after | 10b5-1 |
| Jul 6, 2026 (view filing)5:51 PM ET | Jul 1 | 5 days | Sciammas MauriceEVP, WW Sales & Marketing | SSale | −30 | $1,351.61 | −$40.5K | −2.5%1.15K after | 10b5-1 |
| Jul 17, 2026 (view filing)5:43 PM ET | Jul 15 | 2 days | Sciammas MauriceEVP, WW Sales & Marketing | SSale | −15.0K | $1,349.73 | −$20.2M | −9.0%151.6K after | 18 lots10b5-1 |
| Aug 5, 2026 (view filing)5:33 PM ET | Aug 3 | 2 days | Sciammas MauriceEVP, WW Sales & Marketing | SSale | −30 | $1,343.94 | −$40.3K | −2.6%1.12K after | 10b5-1 |
| Aug 6, 2026 (view filing)6:20 PM ET | Aug 5 | 1 day | Dean Robert W IIInterim CFO | SSale | −105 | $1,344.27 | −$141.1K | −1.5%7.13K after | |
| Aug 13, 2026 (view filing)5:23 PM ET | Aug 11 | 2 days | Chang Kuo Wei HerbertDirector | SSale | −50 | $1,420.00 | −$71.0K | −8.1%565 after | |
| Aug 19, 2026 (view filing)8:44 PM ET | Aug 17 | 2 days | Dean Robert W IIInterim CFO | SSale | −6 | $1,413.64 | −$8.48K | −0.1%7.13K after | |
| Aug 25, 2026 (view filing)7:13 PM ET | Aug 24 | 1 day | Chang Kuo Wei HerbertDirector | SSale | −50 | $1,281.57 | −$64.1K | −8.8%515 after | |
| Aug 26, 2026 (view filing)7:22 PM ET | Aug 24 | 2 days | Dean Robert W IIInterim CFO | SSale | −32 | $1,297.72 | −$41.5K | −0.4%7.09K after |