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
1,083
Shares (Excl. Options)
45,448,217
Price
$1093.35
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- Type / Class
- Equity / Common Stock
- Symbol
- MPWR on Nasdaq
- Shares outstanding
- 49,129,186
- Price per share
- $1592.17
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 45,448,217
- Total reported value
- $49,574,064,310
- % of total 13F portfolios
- 0.02%
- Share change
- -1,613,633
- Value change
- -$1,562,128,655
- Number of holders
- 1,083
- Price from insider filings
- $1592.17
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- MPWR - MONOLITHIC POWER SYSTEMS INC - Common Stock is tracked under CUSIP 609839105.
- 1083 institutions reported positions in Q1 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 1,052 to 1,083 between Q4 2025 and Q1 2026.
- Reported value moved from $43,186,823,948 to $49,574,064,310.
Why This Matters
- 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.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 1083 institutions filings for Q1 2026.
Investment Quick Answers
What is CUSIP 609839105?
CUSIP 609839105 identifies MPWR - MONOLITHIC POWER SYSTEMS INC - Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q1 2026 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 609839105:
Significant Owners of MONOLITHIC POWER SYSTEMS INC - Common Stock (MPWR) based on Schedule 13D/G filings
| 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, 1,083 institutional investors reported holding 45,448,217 shares of MONOLITHIC POWER SYSTEMS INC - Common Stock (MPWR). This represents 93% of the company’s total 49,129,186 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of MONOLITHIC POWER SYSTEMS INC - Common Stock (MPWR) together control 64% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| 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 |
| 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 |
| CITIGROUP INC | 0.69% | 340,832 | +39% | 0.24% | $372,648,381 |
Institutional Holders of MONOLITHIC POWER SYSTEMS INC - Common Stock (MPWR) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 45,448,217 | $49,574,064,310 | -$1,562,128,655 | $1093.35 | 1,083 |
| 2025 Q4 | 47,655,523 | $43,186,823,948 | +$747,384,818 | $906.36 | 1,052 |
| 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 |
| 2019 Q4 | 41,838,285 | $7,450,515,487 | -$73,246,939 | $178.02 | 349 |
| 2019 Q3 | 42,351,592 | $6,591,532,706 | +$52,861,063 | $155.63 | 343 |
| 2019 Q2 | 42,040,561 | $5,705,771,067 | +$206,501,579 | $135.78 | 339 |
| 2019 Q1 | 41,736,982 | $5,655,841,352 | -$86,747,874 | $135.49 | 341 |
| 2018 Q4 | 42,451,324 | $4,934,913,814 | +$217,806,322 | $116.25 | 334 |
| 2018 Q3 | 40,463,736 | $5,079,641,448 | +$61,916,551 | $125.53 | 350 |
| 2018 Q2 | 39,899,582 | $5,333,990,585 | +$129,032,744 | $133.67 | 341 |
| 2018 Q1 | 38,996,384 | $4,514,731,100 | +$114,994,661 | $115.77 | 325 |
| 2017 Q4 | 38,439,899 | $4,319,265,532 | -$103,793,423 | $112.36 | 318 |
| 2017 Q3 | 39,361,866 | $4,194,367,387 | +$50,635,188 | $106.55 | 291 |
| 2017 Q2 | 38,916,034 | $3,752,216,354 | +$64,874,945 | $96.40 | 283 |
| 2017 Q1 | 38,307,935 | $3,528,140,646 | +$259,835,652 | $92.10 | 286 |
| 2016 Q4 | 39,266,525 | $3,218,544,717 | -$27,440,306 | $81.93 | 263 |
| 2016 Q3 | 39,555,200 | $3,183,026,431 | +$168,636,593 | $80.50 | 240 |
| 2016 Q2 | 39,471,515 | $2,696,704,897 | +$36,924,568 | $68.32 | 209 |
| 2016 Q1 | 39,192,404 | $2,490,943,966 | +$99,987,403 | $63.64 | 197 |
| 2015 Q4 | 37,627,753 | $2,397,322,686 | -$49,743,881 | $63.71 | 191 |
| 2015 Q3 | 38,408,694 | $1,966,058,416 | +$72,980,434 | $51.20 | 178 |
| 2015 Q2 | 37,204,401 | $1,886,652,193 | +$30,569,520 | $50.71 | 178 |
| 2015 Q1 | 36,538,309 | $1,923,031,117 | -$13,631,853 | $52.65 | 177 |
| 2014 Q4 | 36,864,580 | $1,833,337,638 | -$12,959,562 | $49.74 | 169 |
| 2014 Q3 | 37,165,175 | $1,637,185,627 | -$771,817 | $44.05 | 173 |
| 2014 Q2 | 37,224,227 | $1,576,398,316 | -$20,145,088 | $42.35 | 158 |
| 2014 Q1 | 37,700,139 | $1,461,102,651 | +$22,829,601 | $38.77 | 148 |