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 4 sales; 1,258 institutions reported holding it in 13F filings for Q2 2026, worth $65.6B in total; superinvestors D1 Capital Partners and Maverick Capital hold it.
Holders of 5% or more of MPWR
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Monolithic Power Systems, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 10.20%4.90M shares | +0.40 ppfrom 9.80% | Apr 17, 20252 filings | Jan 8, 2026 | SEC |
| FMR LLC | 13G/A | 9.10%4.45M shares | −1.40 ppfrom 10.50% | Feb 9, 20245 filings | Nov 5, 2026 | SEC |
| Vanguard Capital Management LLC | 13G | 7.25%3.56M shares | New | Apr 30, 20261 filing | Apr 30, 2026 | SEC |
| Vanguard Portfolio Management LLC | 13G | 5.14%2.53M shares | New | Apr 29, 20261 filing | Apr 29, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
25 Schedule 13D and 13G filings on Monolithic Power Systems, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Nov 10, 20264:47 PM ET | Invesco Ltd. | 13G/A | 4.80%2.35M shares | −0.40 ppfrom 5.20%Below 5% | Sep 30, 2026 | SEC |
| Nov 5, 20261:22 PM ET | FMR LLCand 1 other | 13G/A | 9.10%4.45M shares | −1.40 ppfrom 10.50% | Sep 30, 2026 | SEC |
| Jul 15, 20263:52 PM ET | Invesco Ltd. | 13G | 5.20%2.51M shares | New | Dec 31, 2025 | SEC |
| Jul 8, 202610:11 AM ET | FMR LLCand 1 other | 13G/A | 10.50%5.18M shares | +2.20 ppfrom 8.30% | Jun 30, 2026 | SEC |
| Apr 30, 202611:45 AM ET | Vanguard Capital Management LLC | 13G | 7.25%3.56M shares | New | Mar 31, 2026 | SEC |
| Apr 29, 20262:11 PM ET | Vanguard Portfolio Management LLC | 13G | 5.14%2.53M shares | New | Mar 31, 2026 | SEC |
| Mar 27, 202610:49 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −12.40 ppfrom 12.40%Below 5% | Mar 13, 2026 | SEC |
| Feb 5, 20261:31 PM ET | FMR LLCand 1 other | 13G/A | 8.30%3.98M shares | – | Dec 31, 2025 | SEC |
| Jan 8, 20261:28 PM ET | BlackRock, Inc. | 13G/A | 10.20%4.90M shares | +0.40 ppfrom 9.80% | Dec 31, 2025 | SEC |
| Jul 29, 20251:54 PM ET | Vanguard Group Inc | 13G/A | 12.40%5.94M shares | – | Jun 30, 2025 | SEC |
| Apr 17, 20256:50 PM ET | BlackRock, Inc. | 13G/A | 9.80%4.67M shares | – | Mar 31, 2025 | SEC |
| Nov 12, 2024 | FMR LLC | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2024 | Price T Rowe Associates Inc | 13GOld format | – | – | – | SEC |
| Feb 13, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2024 | FMR LLC | 13GOld format | – | New | – | SEC |
| Jan 24, 20249:46 AM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2023 | Price T Rowe Associates Inc | 13GOld format | – | New | – | SEC |
| Feb 9, 2023 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jan 26, 20238:43 AM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jan 20, 20235:17 PM ET | BlackRock Inc. | 13GOld format | – | – | – | SEC |
| Feb 10, 2022 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jan 28, 20221:54 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Mar 10, 2021 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2021 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jan 26, 20212:20 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
223 notices from officers, directors and other affiliates planning to sell Monolithic Power Systems, Inc. shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Sep 28, 20265:50 PM ET | Michael HsingOfficer · Director | 30.0K | $40.3M | Sep 28, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 24, 20268:17 PM ET | Dean Robert W IIOfficer | 32 | $41.5K | Aug 24, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 17, 20266:34 PM ET | Dean Robert W IIOfficer | 6 | $8.13K | Aug 17, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 11, 202612:28 PM ET | Kuo Wei ChangDirector | 100 | $142.0K | Aug 11, 2026 | UBS Financial Services Inc | SEC |
| Aug 5, 20264:16 PM ET | Robert DeanOfficer | 105 | $141.1K | Aug 5, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Jul 15, 20265:03 PM ET | Maurice SciammasOfficer | 15.0K | $20.2M | Jul 15, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Jun 1, 20264:11 PM ET | Theodore Bernhard BlegenOfficer | 3.00K | $4.63M | Jun 1, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 28, 20261:16 PM ET | Saria TsengOfficer | 7.57K | $12.9M | May 27, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 26, 20266:50 PM ET | Dean Robert W IIOfficer | 22 | $35.9K | May 26, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 26, 20264:06 PM ET | Jeff ZhouDirector | 486 | $816.5K | May 26, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 22, 20266:26 PM ET | Saria TsengOfficer | 5.00K | $7.93M | May 22, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 18, 20268:18 PM ET | Dean Robert W IIOfficer | 4 | $6.25K | May 18, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 18, 20265:57 PM ET | Michael HsingOfficer · Director | 40.0K | $59.3M | May 18, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 15, 20264:42 PM ET | Maurice SciammasOfficer | 12.0K | $18.7M | May 15, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 6, 20268:32 PM ET | Elmiger Eugen JDirector | 12.0K | $19.8M | May 7, 2026 | Luzerner Kantonalbank AG | SEC |
| May 6, 20265:10 PM ET | Deming XiaoOfficer | 30.0K | $49.6M | May 6, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 6, 20264:47 PM ET | Jeff ZhouDirector | 500 | $825.0K | May 6, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 6, 20264:26 PM ET | Eileen WynneDirector | 335 | $530.2K | May 6, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 5, 20265:03 PM ET | Jeff ZhouDirector | 1.01K | $1.61M | May 5, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 5, 202610:50 AM ET | Rosalind SciammasFamily member of an insider | 400 | $600.0K | May 5, 2026 | UBS Financial Services Inc | SEC |
| May 1, 20264:07 PM ET | Theodore Bernhard BlegenOfficer | 3.00K | $4.64M | May 1, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Apr 8, 20265:14 PM ET | Saria TsengOfficer | 8.96K | $11.7M | Apr 8, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Apr 6, 20265:04 PM ET | Saria TsengOfficer | 7.64K | $8.92M | Apr 6, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Apr 1, 20264:58 PM ET | Saria TsengOfficer | 1.40K | $1.59M | Apr 1, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Apr 1, 20264:08 PM ET | Theodore Bernhard BlegenOfficer | 3.00K | $3.34M | Apr 1, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
Showing the latest 25. See the MPWR notices from the last 12 months