Latest Period
Q1 2026
Security Snapshot
MONOLITHIC POWER SYSTEMS INC - Common Stock (MPWR) Institutional Ownership
CUSIP: 609839105
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
1,108
Shares (Excl. Options)
46,195,930
Price
$1093.35
Save this security page for your next review
Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.
- Security type / class
- Equity / Common Stock
- Symbol
- MPWR on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 46,195,930
- Total 13F value
- $50,403,348,665
- Portfolio coverage rank
- 0.02%
- Share change
- -1,674,708
- Value change
- -$1,643,996,404
- Number of holders
- 1,108
- Shares outstanding
- 49,129,186
- SEC-reported price per share
- $1633.17
- Insider filing price
- $1633.17
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- MPWR - MONOLITHIC POWER SYSTEMS INC - Common Stock is tracked under CUSIP 609839105.
- 1108 institutions reported positions in Q1 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 1,054 to 1,108 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $43,197,227,155 to $50,403,348,665.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 1108 institutions filings for Q1 2026.
Security key
609839105
Latest holder period
Q1 2026
13F holders
1,108
13D/G owners
4
CIK / CUSIP context first
Open Q1 2026 holders
MPWR full holder history
MONOLITHIC POWER SYSTEMS INC SEC filings
MONOLITHIC POWER SYSTEMS INC company facts
MONOLITHIC POWER SYSTEMS INC insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 609839105:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
4
Security
MPWR
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 10% | +4% | $4,440,605,266 | +$203,578,448 | 4,899,383 | +4.8% | BlackRock, Inc. | 31 Dec 2025 |
| FMR LLC | 8.3% | $3,604,601,251 | 3,977,008 | FMR LLC | 31 Dec 2025 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 7.2% | $3,894,366,547 | 3,561,866 | Vanguard Capital Management | 31 Mar 2026 | |||
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.1% | $2,765,003,682 | 2,528,928 | Vanguard Portfolio Management | 31 Mar 2026 |
As of 31 Mar 2026, 1,108 institutional investors reported holding 46,195,930 shares of MONOLITHIC POWER SYSTEMS INC - Common Stock (MPWR). This represents 94% of the company’s total 49,129,186 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
64%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 12% | 6,072,467 | +1.8% | 0.12% | $6,639,332,032 |
| FMR LLC | 9% | 4,400,831 | +11% | 0.25% | $4,811,648,189 |
| VANGUARD CAPITAL MANAGEMENT LLC | 6.3% | 3,083,449 | 0% | 0.08% | $3,371,288,965 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.1% | 2,516,492 | 0% | 0.14% | $2,751,406,528 |
| STATE STREET CORP | 4.5% | 2,188,454 | +0.37% | 0.08% | $2,397,061,793 |
| Invesco Ltd. | 3% | 1,485,093 | +3.5% | 0.25% | $1,623,726,783 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.9% | 1,432,066 | +3.6% | 0.1% | $1,560,540,423 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 2.6% | 1,262,954 | -25% | 0.16% | $1,380,852,000 |
| FRANKLIN RESOURCES INC | 1.9% | 928,671 | -12% | 0.25% | $1,015,362,732 |
| T. Rowe Price Investment Management, Inc. | 1.5% | 721,622 | -0.4% | 0.54% | $788,986,000 |
| MORGAN STANLEY | 1.3% | 656,367 | +1.1% | 0.04% | $717,641,962 |
| FIRST TRUST ADVISORS LP | 1.2% | 591,353 | -16% | 0.46% | $646,556,012 |
| GOLDMAN SACHS GROUP INC | 1.2% | 568,064 | -4.3% | 0.08% | $621,092,710 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 1.2% | 567,769 | -0.52% | 0.22% | $620,748,732 |
| BARCLAYS PLC | 1.1% | 555,808 | -8.1% | 0.22% | $607,692,677 |
| JPMORGAN CHASE & CO | 1.1% | 554,919 | +8.3% | 0.04% | $556,219,036 |
| UBS Group AG | 1.1% | 540,413 | +23% | 0.1% | $590,860,554 |
| VAN ECK ASSOCIATES CORP | 1.1% | 524,571 | +4.4% | 0.43% | $573,539,000 |
| NORTHERN TRUST CORP | 1% | 489,120 | +1.1% | 0.07% | $534,779,352 |
| ROYAL BANK OF CANADA | 0.96% | 473,368 | +168% | 0.1% | $517,557,000 |
| VOYA INVESTMENT MANAGEMENT LLC | 0.8% | 393,559 | +16% | 0.45% | $429,851,204 |
| BANK OF AMERICA CORP /DE/ | 0.78% | 382,162 | -30% | 0.03% | $417,836,944 |
| Legal & General Group Plc | 0.77% | 380,089 | +6.6% | 0.1% | $415,570,309 |
| BROWN ADVISORY INC | 0.77% | 379,897 | -24% | 0.68% | $415,383,257 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.77% | 376,374 | +3% | 0.06% | $411,508,513 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
Rows shown
1-25 of 49
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 46,195,930 | $50,403,348,665 | -$1,643,996,404 | $1093.35 | 1,108 |
| 2025 Q4 | 47,667,001 | $43,197,227,155 | +$748,167,007 | $906.36 | 1,054 |
| 2025 Q3 | 46,597,013 | $42,879,888,431 | -$553,016,851 | $920.64 | 971 |
| 2025 Q2 | 47,319,591 | $34,604,458,962 | +$1,173,714,219 | $731.38 | 896 |
| 2025 Q1 | 46,061,486 | $26,700,920,271 | -$286,601,097 | $579.98 | 848 |
| 2024 Q4 | 46,496,915 | $27,530,887,700 | -$375,710,095 | $591.70 | 848 |
| 2024 Q3 | 46,241,327 | $42,731,203,371 | -$427,288,195 | $924.50 | 866 |
| 2024 Q2 | 46,878,387 | $38,519,520,474 | +$907,307,790 | $821.68 | 829 |
| 2024 Q1 | 45,912,491 | $31,091,246,206 | +$223,402,574 | $677.42 | 796 |
| 2023 Q4 | 45,402,028 | $28,629,807,533 | -$418,776,941 | $630.78 | 725 |
| 2023 Q3 | 45,982,739 | $21,242,239,379 | -$481,094,575 | $462.00 | 649 |
| 2023 Q2 | 46,640,420 | $25,183,815,752 | +$71,548,693 | $540.23 | 644 |
| 2023 Q1 | 46,369,939 | $23,198,306,260 | -$181,669,790 | $500.54 | 658 |
| 2022 Q4 | 47,017,508 | $16,624,837,267 | +$359,311,854 | $353.61 | 597 |
| 2022 Q3 | 45,983,338 | $16,720,600,237 | +$788,203,527 | $363.40 | 618 |
| 2022 Q2 | 43,709,252 | $16,792,098,001 | -$82,246,755 | $384.04 | 609 |
| 2022 Q1 | 43,853,705 | $21,267,523,237 | +$130,242,076 | $485.68 | 598 |
| 2021 Q4 | 43,564,292 | $21,489,393,439 | -$228,912,278 | $493.33 | 609 |
| 2021 Q3 | 43,483,682 | $21,075,138,239 | +$250,126,712 | $484.68 | 565 |
| 2021 Q2 | 42,846,046 | $15,982,432,031 | +$416,974,703 | $373.45 | 518 |
| 2021 Q1 | 42,738,703 | $15,095,910,243 | +$67,555,402 | $353.21 | 523 |
| 2020 Q4 | 42,520,318 | $15,566,068,580 | -$7,548,319 | $366.23 | 505 |
| 2020 Q3 | 42,417,552 | $11,858,147,686 | -$118,457,404 | $279.61 | 431 |
| 2020 Q2 | 42,823,926 | $10,170,291,358 | +$97,254,699 | $237.00 | 397 |
| 2020 Q1 | 42,490,931 | $7,116,341,479 | +$34,814,384 | $167.46 | 348 |