Who owns Monolithic Power Systems (MPWR)
Which tracked institutional funds hold MPWR, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MPWR company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on MPWR is one-sided between 2026-Q1 and 2026-Q2: 500 added or opened and 132 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
MPWR’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.1% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.0pp gap the other way — the median holder sizes MPWR more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in MPWR divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 1182 tracked filers holding MPWR, 608 increased or opened the position and 575 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in MPWR between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 70
- D1 Capital Partners L.P.$118M
- Qube Research & Technologies Ltd$89M
- RENAISSANCE TECHNOLOGIES LLC$87M
- WORLDQUANT MILLENNIUM ADVISORS LLC$65M
- Quadrature Capital Ltd$62M
- LMR Partners LLP$49M
Full exits 44
- Anther Capital Ltd$255M
- Amundi$174M
- SORA INVESTORS LLC$27M
- ARCADIA INVESTMENT MANAGEMENT CORP/MI$22M
- Ceredex Value Advisors LLC$19M
- Night Squared LP$16M
Largest adds
- FMR LLC$2.3B
- Invesco Ltd.$2.1B
- BlackRock, Inc.$1.6B
- VAN ECK ASSOCIATES CORP$1.0B
- VANGUARD CAPITAL MANAGEMENT LLC$951M
- STATE STREET CORP$762M
Largest trims
- WELLINGTON MANAGEMENT GROUP LLP$174M
- BROWN ADVISORY INC$166M
- NOMURA ASSET MANAGEMENT CO LTD$117M
- Grandeur Peak Global Advisors, LLC$48M
- TD Asset Management Inc$44M
- HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND$43M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 5,589,925 | $7.7B | 13.5% | 2026-Q2 |
| FMR LLC added | 5,177,258 | $7.2B | 12.5% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 3,126,756 | $4.3B | 7.5% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 2,504,858 | $3.5B | 6.0% | 2026-Q2 |
| Invesco Ltd. added | 2,343,930 | $3.2B | 5.7% | 2026-Q2 |
| STATE STREET CORP added | 2,282,186 | $3.2B | 5.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 1,195,281 | $1.6B | 2.9% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 976,798 | $1.4B | 2.4% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 811,974 | $1.1B | 2.0% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 780,650 | $1.1B | 1.9% | 2026-Q2 |
| NORGES BANK added | 751,399 | $1.0B | 1.8% | 2026-Q2 |
| VAN ECK ASSOCIATES CORP added | 746,237 | $1.0B | 1.8% | 2026-Q2 |
| MORGAN STANLEY added | 727,885 | $1.0B | 1.8% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 536,236 | $741M | 1.3% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 487,212 | $674M | 1.2% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 482,781 | $667M | 1.2% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 479,492 | $663M | 1.2% | 2026-Q2 |
| BARCLAYS PLC trimmed | 474,132 | $655M | 1.1% | 2026-Q2 |
| Rafferty Asset Management, LLC added | 459,278 | $635M | 1.1% | 2026-Q2 |
| UBS Group AG trimmed | 449,479 | $621M | 1.1% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 442,176 | $611M | 1.1% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 434,949 | $571M | 1.0% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 388,951 | $538M | 0.9% | 2026-Q2 |
| Legal & General Group Plc trimmed | 359,936 | $498M | 0.9% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC trimmed | 340,269 | $470M | 0.8% | 2026-Q2 |
| CITIGROUP INC trimmed | 325,281 | $450M | 0.8% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 292,368 | $404M | 0.7% | 2026-Q2 |
| Bank of New York Mellon Corp added | 291,107 | $402M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 279,965 | $387M | 0.7% | 2026-Q2 |
| FIL Ltd added | 224,582 | $310M | 0.5% | 2026-Q2 |
| California Public Employees Retirement System added | 223,899 | $310M | 0.5% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 207,881 | $287M | 0.5% | 2026-Q2 |
| KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC trimmed | 206,130 | $285M | 0.5% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 190,811 | $262M | 0.5% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 190,505 | $263M | 0.5% | 2026-Q2 |
| JENNISON ASSOCIATES LLC added | 185,502 | $256M | 0.4% | 2026-Q2 |
| BROWN ADVISORY INC trimmed | 180,434 | $249M | 0.4% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 180,241 | $249M | 0.4% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 179,293 | $248M | 0.4% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 177,107 | $194M | 0.3% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 167,290 | $231M | 0.4% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 156,360 | $216M | 0.4% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 154,447 | $213M | 0.4% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 148,792 | $206M | 0.4% | 2026-Q2 |
| EARNEST PARTNERS LLC trimmed | 148,707 | $206M | 0.4% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 147,966 | $205M | 0.4% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC trimmed | 147,212 | $204M | 0.4% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 145,618 | $201M | 0.4% | 2026-Q2 |
| VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. added | 144,974 | $200M | 0.3% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 144,949 | $200M | 0.3% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 136,835 | $189M | 0.3% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 132,064 | $183M | 0.3% | 2026-Q2 |
| Swiss National Bank trimmed | 131,610 | $182M | 0.3% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 131,302 | $182M | 0.3% | 2026-Q2 |
| Artisan Partners Limited Partnership trimmed | 130,154 | $180M | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 129,720 | $179M | 0.3% | 2026-Q2 |
| Nuveen, LLC trimmed | 129,292 | $179M | 0.3% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 123,776 | $171M | 0.3% | 2026-Q2 |
| TimesSquare Capital Management, LLC trimmed | 110,824 | $153M | 0.3% | 2026-Q2 |
| Sumitomo Mitsui Trust Group, Inc. trimmed | 110,819 | $153M | 0.3% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 108,573 | $150M | 0.3% | 2026-Q2 |
| Vanguard Global Advisers, LLC trimmed | 106,109 | $147M | 0.3% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 103,548 | $143M | 0.2% | 2026-Q2 |
| Pictet Asset Management Holding SA trimmed | 100,736 | $139M | 0.2% | 2026-Q2 |
| Mirae Asset Global Investments Co., Ltd. added | 97,618 | $135M | 0.2% | 2026-Q2 |
| Allianz Asset Management GmbH added | 96,512 | $106M | 0.2% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 96,352 | $133M | 0.2% | 2026-Q2 |
| Robeco Schweiz AG added | 96,033 | $133M | 0.2% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 95,039 | $131M | 0.2% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 94,482 | $131M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 94,367 | $130M | 0.2% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 92,594 | $128M | 0.2% | 2026-Q2 |
| D1 Capital Partners L.P. new | 85,103 | $118M | 0.2% | 2026-Q2 |
| Allspring Global Investments Holdings, LLC trimmed | 84,341 | $112M | 0.2% | 2026-Q2 |
| Baird Financial Group, Inc. added | 81,895 | $113M | 0.2% | 2026-Q2 |
| CONGRESS ASSET MANAGEMENT CO trimmed | 80,425 | $111M | 0.2% | 2026-Q2 |
| ZEVENBERGEN CAPITAL INVESTMENTS LLC trimmed | 78,604 | $109M | 0.2% | 2026-Q2 |
| CAPITOLIS LIQUID GLOBAL MARKETS LLC added | 78,432 | $108M | 0.2% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND trimmed | 76,360 | $106M | 0.2% | 2026-Q2 |
| Liontrust Investment Partners LLP added | 75,786 | $105M | 0.2% | 2026-Q2 |
| Quantinno Capital Management LP added | 75,694 | $105M | 0.2% | 2026-Q2 |
| DF DENT & CO INC trimmed | 72,954 | $101M | 0.2% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 72,001 | $100M | 0.2% | 2026-Q2 |
| Ensign Peak Advisors, Inc trimmed | 71,154 | $98M | 0.2% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 69,420 | $96M | 0.2% | 2026-Q2 |
| STIFEL FINANCIAL CORP trimmed | 67,103 | $93M | 0.2% | 2026-Q2 |
| LPL Financial LLC trimmed | 65,267 | $90M | 0.2% | 2026-Q2 |
| ProShare Advisors LLC trimmed | 64,600 | $89M | 0.2% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 64,548 | $89M | 0.2% | 2026-Q2 |
| National Pension Service trimmed | 63,529 | $88M | 0.2% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 63,487 | $88M | 0.2% | 2026-Q2 |
| Impax Asset Management Group plc trimmed | 63,427 | $88M | 0.2% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 63,066 | $87M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 61,251 | $84M | 0.1% | 2026-Q2 |
| CIBC Bancorp USA Inc. trimmed | 61,206 | $85M | 0.1% | 2026-Q2 |
| JONES FINANCIAL COMPANIES LLLP added | 61,012 | $80M | 0.1% | 2026-Q2 |
| BAMCO INC /NY/ trimmed | 58,604 | $81M | 0.1% | 2026-Q2 |
| EVENTIDE ASSET MANAGEMENT, LLC trimmed | 57,790 | $80M | 0.1% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 56,653 | $78M | 0.1% | 2026-Q2 |
| Candriam S.C.A. trimmed | 54,905 | $76M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.