Monolithic Power · ownership
Who owns Monolithic Power?
BlackRock, Inc. is the largest 13F holder: 11.8% of 13F-reported shares calc.
1,238 institutions report 47.4M Monolithic Power shares in Form 13F, as of quarter end Jun 30, 2026; +163K shares vs Mar 31, 2026.
- BlackRock, Inc.11.8%5.6M shares · −483K vs prior quarter (down) · 13F filed Aug 7, 2026
- FMR LLC10.9%5.2M shares · +776K vs prior quarter (up) · 13F filed Aug 13, 2026
- VANGUARD CAPITAL MANAGEMENT LLC6.6%3.1M shares · +43K vs prior quarter (up) · 13F filed Aug 13, 2026
- VANGUARD PORTFOLIO MANAGEMENT LLC5.3%2.5M shares · −12K vs prior quarter (down) · 13F filed Aug 13, 2026
- Invesco Ltd.4.9%2.3M shares · −172K vs prior quarter (down) · 13F filed Aug 14, 2026
- STATE STREET CORP4.8%2.3M shares · +94K vs prior quarter (up) · 13F filed Aug 7, 2026
- GEODE CAPITAL MANAGEMENT, LLC2.5%1.2M shares · −237K vs prior quarter (down) · 13F filed Aug 12, 2026
- PRICE T ROWE ASSOCIATES INC /MD/2.1%977K shares · −286K vs prior quarter (down) · 13F filed Aug 14, 2026
- FRANKLIN RESOURCES INC1.7%812K shares · −117K vs prior quarter (down) · 13F filed Aug 13, 2026
- GOLDMAN SACHS GROUP INC1.6%781K shares · +213K vs prior quarter (up) · 13F filed Aug 14, 2026
- NORGES BANK1.6%751K shares · +751K vs prior quarter (new position) · 13F filed Aug 12, 2026
- VAN ECK ASSOCIATES CORP1.6%746K shares · +222K vs prior quarter (up) · 13F filed Aug 14, 2026
- MORGAN STANLEY1.5%728K shares · +72K vs prior quarter (up) · 13F filed Aug 13, 2026
- BANK OF AMERICA CORP /DE/1.1%536K shares · +154K vs prior quarter (up) · 13F filed Aug 14, 2026
- ROYAL BANK OF CANADA1.0%487K shares · +14K vs prior quarter (up) · 13F filed Aug 14, 2026
- FIRST TRUST ADVISORS LP1.0%483K shares · −109K vs prior quarter (down) · 13F filed Aug 11, 2026
- NORTHERN TRUST CORP1.0%479K shares · −10K vs prior quarter (down) · 13F filed Aug 13, 2026
- BARCLAYS PLC1.0%474K shares · −82K vs prior quarter (down) · 13F filed Aug 14, 2026
- Rafferty Asset Management, LLC1.0%459K shares · +142K vs prior quarter (up) · 13F filed Aug 14, 2026
- UBS Group AG0.9%449K shares · −91K vs prior quarter (down) · 13F filed Aug 13, 2026
Share of 13F-reported shares, not of shares outstanding. 13F covers managers with over $100M in US equities; it is not a full shareholder list.
Method and sources
Source: SEC Form 13F data sets (bulk). Each row links to the holder’s own 13F-HR filing. Holder names exactly as filed; one group can file under several names and CIKs (for example two Vanguard entities), and they are listed separately, as filed.
% = the holder’s shares ÷ all shares reported in 13F filings for this company and quarter (calculated by Hollsteen). This is not a share of shares outstanding. Change = shares vs the same filer’s 13F for the prior quarter (Mar 31, 2026).
Erroneous filings and rows are handled by a fixed rule set (restatements replace originals; non-equity rows and implausible rows excluded): 16 erroneous filings excluded or replaced this quarter. No market values are shown.
SEC filings only. No price or market data.
Who holds more than 5%?
5 current Schedule 13D/13G holders
Schedule 13D/13G filings (8) ›
- FMR LLC 10.5%
13G/A filed Jul 8, 2026 · event date Jun 30, 2026 · 5 earlier filings
- BlackRock, Inc. 10.2%
13G/A filed Jan 8, 2026 · event date Dec 31, 2025 · 10 earlier filings
- VANGUARD CAPITAL MANAGEMENT LLC 7.25%
13G filed Apr 30, 2026 · event date Mar 31, 2026
- Invesco Ltd. 5.2%
13G filed Jul 15, 2026 · event date Dec 31, 2025
- VANGUARD PORTFOLIO MANAGEMENT LLC 5.14%
13G filed Apr 29, 2026 · event date Mar 31, 2026
- VANGUARD GROUP INC 0%
below 5% latest filing reports under 5% · 13G/A filed Mar 27, 2026 · event date Mar 13, 2026 · 9 earlier filings
- PRICE T ROWE ASSOCIATES INC /MD/ 4.6%
stale filed Feb 14, 2024: older than 18 months, not a current holding · 13G filed Feb 14, 2024 · 1 earlier filing
- FRANKLIN RESOURCES INC 4.9%
stale filed Feb 5, 2020, as of Dec 31, 2019: older than 18 months, not a current holding · 13G/A filed Feb 5, 2020 · 1 earlier filing
Method and sources
Schedule 13D (active) and 13G (passive) are filed by holders of more than 5% of a class. The percentage is the holder’s own cover-page “percent of class”. A filing older than 18 months (filed before 2025-04-17) is marked stale and is never shown as a current holding. Data as of Oct 14, 2026.
SEC filings only.
Are insiders buying or selling?
0 open-market purchases, 317 sales in 12 months
Form 4, Oct 14, 2025 – Oct 14, 2026 · 0 shares bought, 632,391 shares sold (net −632K) · as of Oct 14, 2026
Latest 25 of 465 Form 4 transactions ›
| Date | Insider (as filed) | Transaction | Shares | Held after |
|---|---|---|---|---|
| Sep 28, 2026 | Hsing Michael · Director; CEO | Open-market sale · 10b5-1 | 596 disposed | 847,668 |
| Sep 28, 2026 | Hsing Michael · Director; CEO | Open-market sale · 10b5-1 | 2,121 disposed | 845,547 |
| Sep 28, 2026 | Hsing Michael · Director; CEO | Open-market sale · 10b5-1 | 1,111 disposed | 844,436 |
| Sep 28, 2026 | Hsing Michael · Director; CEO | Open-market sale · 10b5-1 | 2,949 disposed | 841,487 |
| Sep 28, 2026 | Hsing Michael · Director; CEO | Open-market sale · 10b5-1 | 5,783 disposed | 835,704 |
| Sep 28, 2026 | Hsing Michael · Director; CEO | Open-market sale · 10b5-1 | 6,343 disposed | 829,361 |
| Sep 28, 2026 | Hsing Michael · Director; CEO | Open-market sale · 10b5-1 | 10,967 disposed | 818,394 |
| Sep 28, 2026 | Hsing Michael · Director; CEO | Open-market sale · 10b5-1 | 130 disposed | 818,264 |
| Aug 31, 2026 | Tseng Saria · EVP & General Counsel | Gift | 2,000 disposed | 142,218 |
| Aug 31, 2026 | Tseng Saria · EVP & General Counsel | Gift | 2,000 acquired | 2,000 |
| Aug 24, 2026 | DEAN ROBERT W II · Interim CFO | Open-market sale | 32 disposed | 7,094 |
| Aug 24, 2026 | DEAN ROBERT W II · Interim CFO | Other | 5 disposed | 7,089 |
| Aug 24, 2026 | CHANG KUO WEI HERBERT · Director | Open-market sale | 50 disposed | 515 |
| Aug 17, 2026 | DEAN ROBERT W II · Interim CFO | Open-market sale | 6 disposed | 7,126 |
| Aug 11, 2026 | CHANG KUO WEI HERBERT · Director | Open-market sale | 50 disposed | 565 |
| Aug 5, 2026 | DEAN ROBERT W II · Interim CFO | Open-market sale | 105 disposed | 7,132 |
| Aug 4, 2026 | Sciammas Maurice · EVP, WW Sales & Marketing | Gift | 25,000 disposed | 126,644 |
| Aug 4, 2026 | Sciammas Maurice · EVP, WW Sales & Marketing | Gift | 25,000 acquired | 36,062 |
| Aug 3, 2026 | Sciammas Maurice · EVP, WW Sales & Marketing | Open-market sale · 10b5-1 | 30 disposed | 1,119 |
| Jul 25, 2026 | DEAN ROBERT W II · Interim CFO | Grant or award | 1,359 acquired | 7,237 |
| Jul 15, 2026 | Sciammas Maurice · EVP, WW Sales & Marketing | Open-market sale · 10b5-1 | 527 disposed | 166,117 |
| Jul 15, 2026 | Sciammas Maurice · EVP, WW Sales & Marketing | Open-market sale · 10b5-1 | 274 disposed | 165,843 |
| Jul 15, 2026 | Sciammas Maurice · EVP, WW Sales & Marketing | Open-market sale · 10b5-1 | 409 disposed | 165,434 |
| Jul 15, 2026 | Sciammas Maurice · EVP, WW Sales & Marketing | Open-market sale · 10b5-1 | 464 disposed | 164,970 |
| Jul 15, 2026 | Sciammas Maurice · EVP, WW Sales & Marketing | Open-market sale · 10b5-1 | 776 disposed | 164,194 |
Method and sources
Form 4 filings (not 4/A), table I. Open market = transaction codes P (purchase) and S (sale); grants, option exercises, tax withholding and gifts are listed but not counted as buys or sells. Shares and share counts only, as filed; Hollsteen shows no per-share prices. Data is an export, as of Oct 14, 2026, not live.
SEC filings only.