$MPWR

$1,186.33 +$19.06 (1.63%) Live

$MPWR Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 49.1M shares outstanding

Who owns MPWR?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 75.1%

BlackRock, Inc. 17.6% · FMR LLC 10.6%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

1,336

+113 vs last qtr

Net shares bought

−23.8K

by institutions in Q2 2026

New / sold out

220 / 107

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +935.7K
FMR LLC +776.8K

Biggest sellers in Q2 2026

T. Rowe Price Investment Management, Inc. SOLD OUT −721.6K
Hennessy Advisors Inc SOLD OUT −377.8K

Who is planning to sell?

Notices of proposed sale, last 12 months

$743M

53 notices from 21 people

Shares covered

626.1K

1.27% of the company

Arranged in advance

37%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Michael Hsing Officer $216M
Saria Tseng Officer $106M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+15.3%

+1.59% a year

Each share's claim on the business

−13.2%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$647M vs $1.19B

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years79% 3–5 years4% 1–3 years6% Under 1 year11%

Quarterly turnover

10.1%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting MPWR on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	8.6M	17.60%	−251.2K (−2.8%)	≤2021	0.1%
Shares held by quarter Peak holding8.9M (Q1'26) Change over 8 quarters+646.8K Share of the company17.600% BlackRock, Inc.'s full portfolio →
F FMR LLC	5.2M	10.55%	+776.8K (+17.6%)	≤2021	0.3%
Shares held by quarter Peak holding5.2M (Q2'26) Change over 8 quarters+1.6M Share of the company10.550% FMR LLC's full portfolio →

BlackRock, Inc.

8.6M

% of company

17.60%

Change vs last qtr

−251.2K (−2.8%)

Held since

≤2021

FMR LLC

5.2M

% of company

10.55%

Change vs last qtr

+776.8K (+17.6%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Monolithic Power Systems Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting MPWR on Form N-PORT; together they hold 77.6% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$2.13B	2.5M	5.08%	0.09%	June 30, 2026
SS Select Semiconductors Portfolio Fidelity Select Portfolios	$2.08B	1.6M	3.34%	4.64%	August 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$2.13B

% of company

5.08%

% of the fund

0.09%

As of

June 30, 2026

Select Semiconductors Portfolio

Fidelity Select Portfolios

Position value

$2.08B

% of company

3.34%

% of the fund

4.64%

As of

August 31, 2026

23 more funds behind a free account

See every fund holding Monolithic Power Systems Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
HM Hsing Michael Insider	3.6M	7.42%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company7.420% Hsing Michael's insider activity →
CK Chang Kuo Wei Herbert Insider	444.7K	0.90%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.900% Chang Kuo Wei Herbert's insider activity →

Hsing Michael

Insider

3.6M

% of company

7.42%

Change vs last qtr

—

Held since

—

Chang Kuo Wei Herbert

Insider

444.7K

% of company

0.90%

Change vs last qtr

—

Held since

—

10 more holders behind a free account

See every insider and 5%+ holder of Monolithic Power Systems Inc.

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