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MPWR in the 13F filings

Monolithic PWR Sys Inc · CUSIP 609839105

Sector · SemiconductorsTheme · AI infrastructure and semiconductors· L3VLUP-definedTheme · Semiconductors
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
30 Sep 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 29 Oct 2025
Managers listing it
16
at least, of 95 tracked, among listed positions
Comparable managers
95
filed both Q2 2025 and Q3 2025; 10 listed it in both
Shares listed
8,702,712
combined, among listed positions
Reported value
$8.0bn
combined, at the quarter end

Among the 95 comparable managers: 10 buyers (opened or added shares) and 8 sellers (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.

Managers listing MPWR in Q3 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q2 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

16 of 16 holders

ActionFiling
Fidelity (FMR LLC)3,564,796$3.3bn0.17%Added+172,09213 Nov 2025 (the filing on sec.gov)
T. Rowe Price Associates Inc1,573,798$1.4bn0.16%Trimmed-515,00614 Nov 2025 (the filing on sec.gov)
Invesco Ltd1,139,133$1.0bn0.17%Trimmed-26,92613 Nov 2025 (the filing on sec.gov)
MFS Investment Management556,587$512m0.16%Added+71,19929 Oct 2025 (the filing on sec.gov)
Wellington Management Group LLP452,938$417m0.07%Trimmed-250,21314 Nov 2025 (the filing on sec.gov)
AllianceBernstein LP280,703$258m0.08%Trimmed-33,43314 Nov 2025 (the filing on sec.gov)
Citadel Advisors LLC260,466$240munder 0.1%Addedn.a.14 Nov 2025 (the filing on sec.gov)
Artisan Partners LP192,749$177m0.25%Trimmed-14,89812 Nov 2025 (the filing on sec.gov)
Millennium Management LLC170,490$157m0.07%Addedn.a.14 Nov 2025 (the filing on sec.gov)
Neuberger Berman Group LLC167,806$154m0.11%Added+57,41727 Oct 2026 (the filing on sec.gov)
Marshall Wace LLP132,145$122m0.12%Newnew13 Nov 2025 (the filing on sec.gov)
Janus Henderson Group Ltd127,738$118m0.05%Added+30914 Nov 2025 (the filing on sec.gov)
Holocene Advisors LP51,171$47m0.11%Newnew14 Nov 2025 (the filing on sec.gov)
Acadian Asset Management LLC17,723$16munder 0.1%Addedn.a.13 Nov 2025 (the filing on sec.gov)
Moore Capital Management LP12,894$12m0.16%Trimmed-7,10614 Nov 2025 (the filing on sec.gov)
Winton Group Ltd1,575$1.4m0.05%Newnew13 Nov 2025 (the filing on sec.gov)

Largest increases and reductions, by shares

Q2 2025 to Q3 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (3)

Exited (2)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
23 in Q3 2024 to 21 in Q2 2026

Tracked managers listing it, at least.

01020302014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
MPWR by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20132$59mn.a.n.a.
Q3 20134$87mn.a.n.a.
Q4 20133$69mn.a.n.a.
Q1 20144$105mn.a.n.a.
Q2 20144$117mn.a.n.a.
Q3 20146$128mn.a.n.a.
Q4 20146$151mn.a.n.a.
Q1 20152$57mn.a.n.a.
Q2 20152$70mn.a.n.a.
Q3 20154$55mn.a.n.a.
Q4 20154$107mn.a.n.a.
Q1 20165$134mn.a.n.a.
Q2 20162$50mn.a.n.a.
Q3 20163$353mn.a.n.a.
Q4 20163$65mn.a.n.a.
Q1 20174$187mn.a.n.a.
Q2 20174$118mn.a.n.a.
Q3 20174$186mn.a.n.a.
Q4 20175$168mn.a.n.a.
Q1 20187$194mn.a.n.a.
Q2 20189$270mn.a.n.a.
Q3 201810$281mn.a.n.a.
Q4 20187$428mn.a.n.a.
Q1 20199$506mn.a.n.a.
Q2 20199$556mn.a.n.a.
Q3 201911$907mn.a.n.a.
Q4 201910$1.1bnn.a.n.a.
Q1 202013$1.2bnn.a.n.a.
Q2 202014$1.7bnn.a.n.a.
Q3 202021$2.0bnn.a.n.a.
Q4 202015$2.4bnn.a.n.a.
Q1 202113$2.1bnn.a.n.a.
Q2 202116$2.1bnn.a.n.a.
Q3 202114$3.2bnn.a.n.a.
Q4 202118$3.5bnn.a.n.a.
Q1 202216$3.7bnn.a.n.a.
Q2 202220$2.8bnn.a.n.a.
Q3 202224$3.4bnn.a.n.a.
Q4 202222$4.1bnn.a.n.a.
Q1 202324$5.8bnn.a.n.a.
Q2 202316$5.9bnn.a.n.a.
Q3 202316$5.0bnn.a.n.a.
Q4 202319$6.4bn1110
Q1 202419$6.7bn912
Q2 202417$8.0bn712
Q3 202423$8.9bn1410
Q4 202417$5.1bn118
Q1 202518$5.6bn117
Q2 202513$6.4bn611
Q3 202516$8.0bn108
Q4 202512$8.8bn1220
Q1 202612$10.3bn1515
Q2 202621$14.1bn2712

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

MPWR and NVDA →MPWR and AVGO →MPWR and MU →Choose a stock to compare with MPWR →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own MPWR, latest filings →Back to the 13F Explorer →