BLACKROCK
Rank #1
12.3%
- Shares
- 6.07M
- Change
- +110.08K
- Change %
- +1.85%
- Filing
- Mar 31, 2026
Increased
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
NASDAQ · TECHNOLOGY · Holders
Monolithic Power Systems Inc (MPWR) Institutional Ownership & Insider Trading History
Top MPWR institutional shareholders, filing changes, and Form 4 insider activity with filters for buys, sales, option exercises, gifts, and tax withholding.
Section freshness
Price Jun 15, 9:53 AM EDT · Statements Mar 30, 8:00 PM EDT
Source timingDetailsHide
Data freshness
Prices update fastest. Fundamentals, analyst data, and news update on their own schedules, so check these timestamps before comparing signals.
Price time means the latest available trade or regular-market close. Other times show when that section was checked or published.
PriceLive
Last traded •
Source: Market data provider
Fundamentalsevery 1 day
Provider checked •
Source: Market data provider
Analystevery 1 day
Provider checked •
Source: Market data provider
Newsevery 4 hr
Latest item •
Source: Market data provider
Ownership read
MPWR insider sentiment: Net selling.
BLACKROCK is the largest loaded institutional holder. 119 sale rows and 0 purchase rows are visible in the loaded Form 4 history. Use the filters below to separate real buying and selling from option exercises, gifts, awards, and tax withholding.
Insider flow
MPWR
Purchases—
Sales370.76K
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
6.07M
BLACKROCK
Insider stance
Net selling
$455.6M sold / — bought
Latest filing
Jun 1, 2026
Most recent holder or insider filing date
Rows loaded
240
120 holder / 120 insider
- Holder rows
- 120
- Market data source
- Latest filing
- Jun 1, 2026
- Most recent holder or insider filing date
- Increased / initiated
- 47
- 72 decreased in loaded rows
- Insider rows
- 120
- Market data source
Top 120 institutional holders
Monolithic Power Systems Inc (MPWR) institutional ownership
Ranked by reported share count, with position changes and latest filing dates where ownership data supplies them.
VANGUARD GROUP INC
Rank #2
12.2%
- Shares
- 6.03M
- Change
- -39.64K
- Change %
- -65.00%
- Filing
- Dec 31, 2025
Decreased
FMR LLC
Rank #3
8.93%
- Shares
- 4.40M
- Change
- +423.82K
- Change %
- +10.66%
- Filing
- Mar 31, 2026
Increased
VANGUARD CAPITAL MANAGEMENT LLC
Rank #4
6.26%
- Shares
- 3.08M
- Change
- +3.08M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
VANGUARD PORTFOLIO MANAGEMENT LLC
Rank #5
5.11%
- Shares
- 2.52M
- Change
- +2.52M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
STATE STREET CORP
Rank #6
4.44%
- Shares
- 2.19M
- Change
- +8.04K
- Change %
- +37.00%
- Filing
- Mar 31, 2026
Increased
INVESCO LTD.
Rank #7
3.01%
- Shares
- 1.49M
- Change
- +50.40K
- Change %
- +3.51%
- Filing
- Mar 31, 2026
Increased
GEODE CAPITAL MANAGEMENT
Rank #8
2.91%
- Shares
- 1.43M
- Change
- +49.79K
- Change %
- +3.60%
- Filing
- Mar 31, 2026
Increased
PRICE T ROWE ASSOCIATES INC
Rank #9
2.56%
- Shares
- 1.26M
- Change
- -428.44K
- Change %
- -25.33%
- Filing
- Mar 31, 2026
Decreased
FRANKLIN RESOURCES INC
Rank #10
1.88%
- Shares
- 928.67K
- Change
- -120.74K
- Change %
- -11.51%
- Filing
- Mar 31, 2026
Decreased
NORGES BANK
Rank #11
1.47%
- Shares
- 726.71K
- Change
- +127.82K
- Change %
- +21.34%
- Filing
- Dec 31, 2025
Increased
T. ROWE PRICE INVESTMENT MANAGEMENT
Rank #12
1.46%
- Shares
- 721.62K
- Change
- -2.87K
- Change %
- -40.00%
- Filing
- Mar 31, 2026
Decreased
MORGAN STANLEY
Rank #13
1.33%
- Shares
- 656.37K
- Change
- +7.30K
- Change %
- +1.12%
- Filing
- Mar 31, 2026
Increased
FIRST TRUST ADVISORS LP
Rank #14
1.20%
- Shares
- 591.35K
- Change
- -110.10K
- Change %
- -15.70%
- Filing
- Mar 31, 2026
Decreased
GOLDMAN SACHS GROUP INC
Rank #15
1.15%
- Shares
- 568.06K
- Change
- -25.68K
- Change %
- -4.33%
- Filing
- Mar 31, 2026
Decreased
MASSACHUSETTS FINANCIAL SERVICES CO
Rank #16
1.15%
- Shares
- 567.77K
- Change
- -2.95K
- Change %
- -52.00%
- Filing
- Mar 31, 2026
Decreased
BARCLAYS PLC
Rank #17
1.13%
- Shares
- 555.81K
- Change
- -48.99K
- Change %
- -8.10%
- Filing
- Mar 31, 2026
Decreased
JPMORGAN CHASE & CO
Rank #18
1.13%
- Shares
- 554.92K
- Change
- +42.65K
- Change %
- +8.32%
- Filing
- Mar 31, 2026
Increased
UBS GROUP AG
Rank #19
1.10%
- Shares
- 540.41K
- Change
- +101.43K
- Change %
- +23.11%
- Filing
- Mar 31, 2026
Increased
VAN ECK ASSOCIATES CORP
Rank #20
1.06%
- Shares
- 524.57K
- Change
- +22.26K
- Change %
- +4.43%
- Filing
- Mar 31, 2026
Increased
| # | Institution | % held | Shares | Change | Change % | Filing date |
|---|---|---|---|---|---|---|
| 1 | 12.3% | 6.07M | +110.08K Increased | +1.85% | Mar 31, 2026 | |
| 2 | 12.2% | 6.03M | -39.64K Decreased | -65.00% | Dec 31, 2025 | |
| 3 | 8.93% | 4.40M | +423.82K Increased | +10.66% | Mar 31, 2026 | |
| 4 | 6.26% | 3.08M | +3.08M Initiated | — | Mar 31, 2026 | |
| 5 | 5.11% | 2.52M | +2.52M Initiated | — | Mar 31, 2026 | |
| 6 | 4.44% | 2.19M | +8.04K Increased | +37.00% | Mar 31, 2026 | |
| 7 | 3.01% | 1.49M | +50.40K Increased | +3.51% | Mar 31, 2026 | |
| 8 | 2.91% | 1.43M | +49.79K Increased | +3.60% | Mar 31, 2026 | |
| 9 | 2.56% | 1.26M | -428.44K Decreased | -25.33% | Mar 31, 2026 | |
| 10 | 1.88% | 928.67K | -120.74K Decreased | -11.51% | Mar 31, 2026 | |
| 11 | 1.47% | 726.71K | +127.82K Increased | +21.34% | Dec 31, 2025 | |
| 12 | 1.46% | 721.62K | -2.87K Decreased | -40.00% | Mar 31, 2026 | |
| 13 | 1.33% | 656.37K | +7.30K Increased | +1.12% | Mar 31, 2026 | |
| 14 | FIRST TRUST ADVISORS LP | 1.20% | 591.35K | -110.10K Decreased | -15.70% | Mar 31, 2026 |
| 15 | 1.15% | 568.06K | -25.68K Decreased | -4.33% | Mar 31, 2026 | |
| 16 | MASSACHUSETTS FINANCIAL SERVICES CO | 1.15% | 567.77K | -2.95K Decreased | -52.00% | Mar 31, 2026 |
| 17 | BARCLAYS PLC | 1.13% | 555.81K | -48.99K Decreased | -8.10% | Mar 31, 2026 |
| 18 | 1.13% | 554.92K | +42.65K Increased | +8.32% | Mar 31, 2026 | |
| 19 | 1.10% | 540.41K | +101.43K Increased | +23.11% | Mar 31, 2026 | |
| 20 | VAN ECK ASSOCIATES CORP | 1.06% | 524.57K | +22.26K Increased | +4.43% | Mar 31, 2026 |
Showing 20 of 120 matching institutional rows.Load more institutions
Recent insider transactions
Monolithic Power Systems Inc (MPWR) Form 4 filings
Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding.
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 30
- % company
- <0.01%
- Price
- $1,534
- Value
- $46,019
Filed Jun 1, 2026
SCIAMMAS, MAURICE
EVP, WW Sales & Marketing
- Shares
- 12.47K
- % company
- 0.03%
- Price
- Not reported
- Value
- Not reported
Filed May 29, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 7.57K
- % company
- 0.02%
- Price
- $1,700
- Value
- $12,860,500
Filed May 27, 2026
DEAN, ROBERT W II
Interim CFO
- Shares
- 22
- % company
- <0.01%
- Price
- $1,650
- Value
- $36,290
Filed May 26, 2026
ZHOU, JEFF
Director
- Shares
- 486
- % company
- <0.01%
- Price
- $1,680
- Value
- $816,480
Filed May 26, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 200
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 22, 2026
TSENG, SARIA
EVP & General Counsel
- Shares
- 5.00K
- % company
- 0.01%
- Price
- $1,586
- Value
- $7,932,150
Filed May 22, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 352
- % company
- <0.01%
- Price
- $1,518
- Value
- $534,389
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 130
- % company
- <0.01%
- Price
- $1,521
- Value
- $197,786
Filed May 18, 2026
DEAN, ROBERT W II
Interim CFO
- Shares
- 4
- % company
- <0.01%
- Price
- $1,563
- Value
- $6,253
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 5.74K
- % company
- 0.01%
- Price
- $1,483
- Value
- $8,505,160
Filed May 18, 2026
HSING, MICHAEL
Director, CEO
- Shares
- 4.08K
- % company
- <0.01%
- Price
- $1,477
- Value
- $6,028,951
Filed May 18, 2026
| # | Insider | % company | Action | Shares | Price | Value | Filing date |
|---|---|---|---|---|---|---|---|
| 1 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | <0.01% | Sale to issuer | 30 | $1,534 | $46,019 | Jun 1, 2026 |
| 2 | SCIAMMAS, MAURICE EVP, WW Sales & Marketing | 0.03% | Sale to issuer | 12.47K | Not reported | Not reported | May 29, 2026 |
| 3 | TSENG, SARIA EVP & General Counsel | 0.02% | Sale to issuer | 7.57K | $1,700 | $12,860,500 | May 27, 2026 |
| 4 | DEAN, ROBERT W II Interim CFO | <0.01% | Sale to issuer | 22 | $1,650 | $36,290 | May 26, 2026 |
| 5 | ZHOU, JEFF Director | <0.01% | Sale to issuer | 486 | $1,680 | $816,480 | May 26, 2026 |
| 6 | TSENG, SARIA EVP & General Counsel | <0.01% | Sale to issuer | 200 | Not reported | Not reported | May 22, 2026 |
| 7 | TSENG, SARIA EVP & General Counsel | 0.01% | Sale to issuer | 5.00K | $1,586 | $7,932,150 | May 22, 2026 |
| 8 | HSING, MICHAEL Director, CEO | <0.01% | Sale to issuer | 352 | $1,518 | $534,389 | May 18, 2026 |
| 9 | HSING, MICHAEL Director, CEO | <0.01% | Sale to issuer | 130 | $1,521 | $197,786 | May 18, 2026 |
| 10 | DEAN, ROBERT W II Interim CFO | <0.01% | Sale to issuer | 4 | $1,563 | $6,253 | May 18, 2026 |
| 11 | HSING, MICHAEL Director, CEO | 0.01% | Sale to issuer | 5.74K | $1,483 | $8,505,160 | May 18, 2026 |
| 12 | HSING, MICHAEL Director, CEO | <0.01% | Sale to issuer | 4.08K | $1,477 | $6,028,951 | May 18, 2026 |
Showing 12 of 120 matching Form 4 rows. Percent of company uses current shares outstanding when available.Load more insiders
Frequently asked
Common questions.
Who are the largest MPWR shareholders?
BLACKROCK is the largest institutional holder in the loaded MPWR ownership dataset, with 6.07 million shares, or about 12.33% of shares outstanding. The table ranks additional institutions by reported share count.
What is institutional ownership of MPWR?
The current TECHi snapshot has 120 loaded institutional rows for Monolithic Power Systems Inc. 47 rows are marked increased or initiated, while 72 rows are marked decreased, with the latest holder filing dated Mar 31, 2026.
Where can I see Monolithic Power Systems Inc insider transactions?
The insider transaction table currently shows 120 loaded Form 4 rows for MPWR, with the latest insider filing dated Jun 1, 2026. It separates purchases, sales, option exercises, awards, gifts, and tax withholding so administrative transactions are not confused with open-market trades.
Are MPWR insiders buying or selling?
The loaded MPWR Form 4 rows currently read Net selling: 119 sale rows and 0 purchase rows. Awards, gifts, conversions, and tax withholding are shown separately because they do not carry the same signal as open-market buying or selling.
Who is the most active MPWR insider in the loaded filings?
HSING, MICHAEL is the most active insider by absolute share movement in the loaded MPWR rows, with 194,923 shares moving across the visible filing history. Review the action labels before treating that activity as buying or selling.