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Monolithic Power Systems Inc (MPWR)

Technology Semiconductors
1,426.00 $
+8.3% vs. previous close
Closing price · As of: 31. Jul 2026

Who owns Monolithic Power Systems Inc (MPWR)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 96.3% of the shares are freely tradable; institutional investors hold 101.1%.

Ownership Structure

Institutional ownership
101.1%
Insiders
3.7%
Float
96.3%
Short % of float
6.4%
Shares Outstanding
49Mio.

Largest Shareholders

Institutions

Institutions MPWR
Name Stake (%) Shares Change (%) Date
BlackRock Inc 12.36 6,072,467 +1.8 03/31/2026
Vanguard Group Inc 12.28 6,034,394 -0.7 12/31/2025
FMR Inc 8.96 4,400,831 +10.7 03/31/2026
Vanguard Capital Management, LLC 6.28 3,083,449 +0.0 03/31/2026
Vanguard Portfolio Management, LLC 5.12 2,516,492 +0.0 03/31/2026
State Street Corp 4.45 2,188,454 +0.4 03/31/2026
CI Private Wealth LLC 4.27 2,098,506 +3,815.3 12/31/2025
Amvescap Plc. 3.02 1,485,093 +3.5 03/31/2026

Funds

Funds MPWR
Name Stake (%) Shares Change (%) Date
Fidelity Select Semiconductors 3.40 1,668,570 +1.5 04/30/2026
Vanguard Total Stock Mkt Idx Inv 3.00 1,474,124 +0.3 04/30/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Insider Transactions

Insider Transactions
Date Person Role Type Shares Price Value
25. Jul 2026 Dean Robert W Ii Interim CFO Other 1,359 0.00
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 110 1,405.71 154,628
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 117 1,400.45 163,853
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 213 1,396.16 297,382
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 410 1,384.11 567,485
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 418 1,378.73 576,309
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 472 1,375.47 649,222
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 240 1,369.18 328,603
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 50 1,388.19 69,410
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 5,640 1,352.95 7,630,638
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 1,506 1,348.91 2,031,458
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 1,864 1,344.16 2,505,514
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 1,460 1,339.59 1,955,801
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 776 1,334.59 1,035,642
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 464 1,329.30 616,795
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 409 1,323.93 541,487
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 274 1,318.42 361,247
15. Jul 2026 Sciammas Maurice EVP, WW Sales & Marketing Sell 527 1,314.03 692,494

Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.

View all insider transactions →

Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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