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MPWR · Monolithic Power Systems, Inc. · Shareholders & Ownership

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$1,283.32 +34.58 (+2.77%) At close · Oct 21
Market Cap
$61.37B
Shares
49.14M
Volume · Oct 21 611.33K Avg daily vol (3M) 733.92K

Every disclosed holder of MPWR in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns MPWR

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions
Holder group Shares % Out
Institutional (13F) 47,551,200 96.76%
Insiders (Forms 3, 4, 5) 1,450,631 2.95%
13D/G-only blocks 0 0.00%
Remaining 141,169 0.29%
Registered funds (N-PORT, not summed) 23,601,598 48.03%

Shares outstanding: 49,143,000, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of MPWR

# Holder Shares
1
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
5,589,925
1.1
iShares Semiconductor ETF
Fund S000004354 · Registered fund · Jun 30, 2026
iShares Trust, not summed
1,013,044
1.2
iShares Core S&P 500 ETF
Fund S000004310 · Registered fund · Jun 30, 2026
iShares Trust, not summed
676,390
1.3
iShares Russell 1000 Growth ETF
Fund S000004346 · Registered fund · Jun 30, 2026
iShares Trust, not summed
180,568
1.4
BlackRock Mid-Cap Growth Equity Portfolio
Fund S000001505 · Registered fund · May 29, 2026
BlackRock Funds, not summed
136,673
1.5
BlackRock Technology Opportunities Fund
Fund S000001510 · Registered fund · May 29, 2026
BlackRock Funds, not summed
127,635
2
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
5,177,258
2.1
FMR LLC
13G CIK 315066 · Holding company · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
5,175,258
2.2
Select Semiconductors Portfolio
Fund S000007458 · Registered fund · May 31, 2026
Fidelity Select Portfolios, not summed
1,700,486
2.3
Fidelity Blue Chip Growth Fund
Fund S000007195 · Registered fund · Jul 31, 2026
Fidelity Securities Fund, not summed
629,056
2.4
Fidelity 500 Index Fund
Fund S000006027 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
623,330
2.5
Fidelity Advisor Semiconductors Fund
Fund S000005327 · Registered fund · Jul 31, 2026
Fidelity Advisor Series VII, not summed
269,822
3
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
3,126,756
4
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,504,858
5
Invesco Ltd.
13F CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,343,930
5.1
Invesco NASDAQ 100 ETF
Fund S000069448 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
208,947
5.2
Invesco American Franchise Fund
Fund S000027822 · Registered fund · May 31, 2026
AIM Counselor Series Trust (Invesco Counselor Series Trust), not summed
173,636
5.3
Invesco Discovery Mid Cap Growth Fund
Fund S000064710 · Registered fund · Jul 31, 2026
AIM Investment Funds (Invesco Investment Funds), not summed
137,139
5.4
Invesco S&P 500 Equal Weight ETF
Fund S000060812 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
126,757
5.5
Invesco Discovery Large Cap Fund
Fund S000064617 · Registered fund · May 31, 2026
AIM Counselor Series Trust (Invesco Counselor Series Trust), not summed
63,336
6
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
2,282,186
6.1
State Street(R) Technology Select Sector SPDR(R) ETF
Fund S000006415 · Registered fund · Jun 30, 2026
SELECT SECTOR SPDR TRUST, not summed
339,173
6.2
State Street(R) SPDR(R) Portfolio S&P 500(R) ETF
Fund S000006983 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
116,931
6.3
State Street(R) SPDR(R) Portfolio S&P 500(R) Growth ETF
Fund S000006984 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
73,331
6.4
State Street(R) SPDR(R) S&P(R) Semiconductor ETF
Fund S000010020 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
49,555
6.5
State Street Equity 500 Index II Portfolio
Fund S000046029 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
18,660
7
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,481,838
8
VANGUARD 500 INDEX FUND
Fund S000002839 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,273,706
9
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,195,281
10
Invesco QQQ Trust, Series 1
Fund S000101292 · Registered fund · Jun 30, 2026
Invesco QQQ Trust, Series 1, not summed
1,042,894
11
VANGUARD MID-CAP INDEX FUND
Fund S000002844 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,011,166
12
PRICE T ROWE ASSOCIATES INC /MD/
13F CIK 80255 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
976,798
12.1
T. Rowe Price Blue Chip Growth Fund, Inc.
Fund S000002069 · Registered fund · Jun 30, 2026
T. ROWE PRICE BLUE CHIP GROWTH FUND, INC., not summed
329,941
12.2
T. Rowe Price Equity Index 500 Fund
Fund S000002089 · Registered fund · Jun 30, 2026
T. ROWE PRICE INDEX TRUST, INC., not summed
29,980
12.3
T. Rowe Price New Horizons Fund, Inc.
Fund S000002106 · Registered fund · Jun 30, 2026
T. ROWE PRICE NEW HORIZONS FUND, INC., not summed
21,482
12.4
T. Rowe Price U.S. Equity Research Fund
Fund S000002071 · Registered fund · Jun 30, 2026
T. Rowe Price U.S. Equity Research Fund, Inc., not summed
19,181
12.5
T. Rowe Price Institutional Large-Cap Core Growth Fund
Fund S000002096 · Registered fund · Jun 30, 2026
T. Rowe Price Equity Funds, Inc., not summed
13,375
13
Hsing Michael
Insider CIK 1308676 · Sep 28, 2026
Director, CEO, issuer-wide
831,089
14
FRANKLIN RESOURCES INC
13F CIK 38777 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
811,974
14.1
Franklin Dynatech Fund
Fund S000006754 · Registered fund · Jun 30, 2026
Franklin Custodian Funds, not summed
250,000
14.2
Franklin Growth Fund
Fund S000006755 · Registered fund · Jun 30, 2026
Franklin Custodian Funds, not summed
186,831
14.3
Franklin Growth Opportunities Fund
Fund S000006878 · Registered fund · Jul 31, 2026
Franklin Strategic Series, not summed
49,836
14.4
Franklin Small-Mid Cap Growth Fund
Fund S000006888 · Registered fund · Jul 31, 2026
Franklin Strategic Series, not summed
27,214
14.5
Franklin U.S. Large Cap Multifactor Index ETF
Fund S000057200 · Registered fund · Jun 30, 2026
Franklin Templeton ETF Trust, not summed
5,797
15
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
780,650
15.1
Goldman Sachs Nasdaq-100 Premium Income ETF
Fund S000081510 · Registered fund · Jun 30, 2026
Goldman Sachs ETF Trust, not summed
13,128
15.2
Goldman Sachs Mid Cap Growth Fund
Fund S000009321 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
11,204
15.3
Goldman Sachs Rising Dividend Growth Fund
Fund S000036119 · Registered fund · Jul 31, 2026
GOLDMAN SACHS TRUST, not summed
4,800
15.4
Goldman Sachs ActiveBeta(R) U.S. Large Cap Equity ETF
Fund S000048295 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
4,313
15.5
Goldman Sachs S&P 500 Premium Income ETF
Fund S000081511 · Registered fund · Jun 30, 2026
Goldman Sachs ETF Trust, not summed
2,814
16
NORGES BANK
13F CIK 1374170 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
751,399
17
VAN ECK ASSOCIATES CORP
13F CIK 869178 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
746,237
17.1
VanEck Semiconductor ETF
Fund S000034411 · Registered fund · Jun 30, 2026
VanEck ETF Trust, not summed
680,921
17.2
VanEck Fabless Semiconductor ETF
Fund S000086573 · Registered fund · Jun 30, 2026
VanEck ETF Trust, not summed
8,437
17.3
VanEck Morningstar SMID Moat ETF
Fund S000077508 · Registered fund · Jun 30, 2026
VanEck ETF Trust, not summed
1,885
18
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
727,885
18.1
Global Strategist Portfolio
Fund S000004124 · Registered fund · Jun 30, 2026
MORGAN STANLEY INSTITUTIONAL FUND TRUST, not summed
150
18.2
E*TRADE No Fee Large Cap Index Fund
Fund S000090720 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
93
18.3
E*TRADE No Fee Total Market Index Fund
Fund S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
74
18.4
Global Strategist Portfolio
Fund S000004181 · Registered fund · Jun 30, 2026
MORGAN STANLEY VARIABLE INSURANCE FUND INC., not summed
20
19
BANK OF AMERICA CORP /DE/
13F CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
536,236
20
VANGUARD GROWTH INDEX FUND
Fund S000002842 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
531,364
21
ROYAL BANK OF CANADA
13F CIK 1000275 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
487,212
22
FIRST TRUST ADVISORS LP
13F CIK 1125816 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
482,781
22.1
First Trust NASDAQ-100-Technology Sector Index Fund
Fund S000011048 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund, not summed
66,762
22.2
First Trust NASDAQ Clean Edge Green Energy Index Fund
Fund S000015169 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund, not summed
46,448
22.3
FT Vest Rising Dividend Achievers Target Income ETF
Fund S000077479 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded Fund IV, not summed
33,903
22.4
First Trust Nasdaq Semiconductor ETF
Fund S000053947 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund VI, not summed
25,439
22.5
First Trust Technology AlphaDEX Fund
Fund S000017703 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded AlphaDEX Fund, not summed
24,610
23
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
479,492
23.1
Stock Index Fund
Fund S000001247 · Registered fund · Jun 30, 2026
Northern Funds, not summed
14,583
23.2
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
1,023
24
BARCLAYS PLC
13F CIK 312069 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
474,132
25
Rafferty Asset Management, LLC
13F CIK 1389426 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
459,278
25.1
Direxion Daily Semiconductor Bull 3X Shares
Fund S000027920 · Registered fund · Jul 31, 2026
Direxion Shares ETF Trust, not summed
361,069
25.2
Direxion Daily Technology Bull 3X Shares
Fund S000023809 · Registered fund · Jul 31, 2026
Direxion Shares ETF Trust, not summed
12,001
25.3
Direxion NASDAQ-100 Equal Weighted Index Shares
Fund S000033634 · Registered fund · Jul 31, 2026
Direxion Shares ETF Trust, not summed
8,679
25.4
Direxion Daily S&P 500 Bull 3X Shares
Fund S000022767 · Registered fund · Jul 31, 2026
Direxion Shares ETF Trust, not summed
3,840
25.5
Direxion Daily S&P 500 High Beta Bull 3X Shares
Fund S000066279 · Registered fund · Jul 31, 2026
Direxion Shares ETF Trust, not summed
393
26
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
449,479
27
MASSACHUSETTS FINANCIAL SERVICES CO /MA/
13F CIK 912938 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
442,176
27.1
MFS Mid Cap Growth Fund
Fund S000002434 · Registered fund · May 31, 2026
MFS Series Trust IV, not summed
374,986
27.2
MFS Blended Research Mid Cap Equity Fund
Fund S000054892 · Registered fund · May 31, 2026
MFS Series Trust X, not summed
9,743
27.3
MFS Mid Cap Growth Series
Fund S000002678 · Registered fund · Jun 30, 2026
MFS VARIABLE INSURANCE TRUST, not summed
9,042
27.4
MFS Global Alternative Strategy Fund
Fund S000019515 · Registered fund · Jul 31, 2026
MFS Series Trust XV, not summed
292
28
JPMORGAN CHASE & CO
13F CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
434,949
29
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
388,951
29.1
Schwab S&P 500 Index Fund
Fund S000005911 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
109,714
29.2
Schwab U.S. Large-Cap Growth ETF
Fund S000026633 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
104,394
29.3
Schwab U.S. Large-Cap ETF
Fund S000026632 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
51,660
29.4
Schwab Total Stock Market Index Fund
Fund S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
29,865
29.5
Schwab U.S. Broad Market ETF
Fund S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
28,820
30
VANGUARD INFORMATION TECHNOLOGY INDEX FUND
Fund S000004452 · Registered fund · May 31, 2026
VANGUARD WORLD FUND, not summed
369,952
31
Legal & General Group Plc
13F CIK 764068 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
359,936
32
VANGUARD MID-CAP GROWTH INDEX FUND
Fund S000012756 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
357,562
33
VOYA INVESTMENT MANAGEMENT LLC
13F CIK 1068837 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
340,269
34
CITIGROUP INC
13F CIK 831001 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
325,281
35
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
13F CIK 861177 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
292,368
35.1
UBS U.S. Allocation Fund
Fund S000002487 · Registered fund · May 31, 2026
UBS INVESTMENT TRUST, not summed
36
35.2
UBS GLOBAL ALLOCATION FUND
Fund S000002979 · Registered fund · Jun 30, 2026
UBS FUNDS, not summed
15
36
Bank of New York Mellon Corp
13F CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
291,107
36.1
BNY Mellon US Large Cap Core Equity ETF
Fund S000067260 · Registered fund · Jul 31, 2026
BNY Mellon ETF Trust, not summed
3,946
37
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
279,965
38
VANGUARD INSTITUTIONAL INDEX FUND
Fund S000002853 · Registered fund · Jun 30, 2026
VANGUARD INSTITUTIONAL INDEX FUNDS, not summed
266,724
39
First Trust Rising Dividend Achievers ETF
Fund S000043486 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund VI, not summed
230,674
40
FIL Ltd
13F CIK 318989 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
224,582
41
California Public Employees Retirement System
13F CIK 919079 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
223,899
42
Xiao Deming
Insider CIK 1308647 · May 6, 2026
EVP, Global Operations, issuer-wide
210,295
43
BNP PARIBAS ARBITRAGE, SA
13F CIK 1166588 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
207,881
44
KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC
13F CIK 1021223 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
206,130
45
HSBC HOLDINGS PLC
13F CIK 873630 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
190,811
46
TWO SIGMA INVESTMENTS, LP
13F CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
190,505
47
DekaBank Deutsche Girozentrale
13F CIK 1456228 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
190,443
48
JENNISON ASSOCIATES LLC
13F CIK 53417 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
185,502
49
BROWN ADVISORY INC
13F CIK 1345929 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
180,434
49.1
Brown Advisory Sustainable Growth Fund
Fund S000037789 · Registered fund · Jun 30, 2026
Brown Advisory Funds, not summed
59,110
49.2
Brown Advisory Sustainable Growth ETF
Fund S000092068 · Registered fund · Jun 30, 2026
ADVISORS' INNER CIRCLE III, not summed
7,258
49.3
Brown Advisory Mid-Cap Growth Fund
Fund S000058723 · Registered fund · Mar 31, 2026
Brown Advisory Funds, not summed
177
50
PRINCIPAL FINANCIAL GROUP INC
13F CIK 1126328 · Insurance company · Jun 30, 2026
carried, not yet filed for the newest quarter
180,241
50.1
Equity Income Fund
Fund S000014240 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
108,721
50.2
LargeCap S&P 500 Index Fund
Fund S000007016 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
10,126
50.3
Equity Income Account
Fund S000014083 · Registered fund · Jun 30, 2026
Principal Variable Contract Funds, Inc, not summed
9,861
50.4
LargeCap S&P 500 Index Account
Fund S000007660 · Registered fund · Jun 30, 2026
Principal Variable Contract Funds, Inc, not summed
1,851
50.5
LargeCap Growth Fund I
Fund S000007077 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
1,014

229 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

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Key facts CIK 1280452 CUSIP 609839105 13F (30d) 209 filings 203 filers Visit website Investor relations