Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionProShare Advisors LLC
Latest Disclosed Ownership81,441 shares
Latest Disclosed Value $ 89,043,517
ProShare Advisors LLC reports 18.12% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On April 24, 2026 - ProShare Advisors LLC filed a 13F-HR form disclosing ownership of 81,441 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $89,043,517 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 99,461 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -18.12% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-24 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 81,441 -18,020 -18.12 89,044 -1.22 0.1318
2026-02-06 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 99,461 74,082 291.90 90,147 285.84 0.1591
2025-11-06 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 25,379 -3,052 -10.73 23,365 12.36 0.0489
2025-08-07 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 28,431 2,366 9.08 20,794 37.55 0.0415
2025-05-08 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 26,065 8,319 46.88 15,117 43.97 0.0341
2025-02-14 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 17,746 2,570 16.93 10,500 -25.16 0.0240
2024-11-14 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 15,176 -509 -3.25 14,030 8.86 0.0344
2024-08-13 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 15,685 1,630 11.60 12,888 35.36 0.0345
2024-05-08 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 14,055 1,489 11.85 9,521 20.12 0.0253
2024-02-14 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 12,566 -1,454 -10.37 7,926 22.37 0.0242
2023-11-13 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 14,020 -488 -3.36 6,477 -17.35 0.0202
2023-08-10 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 14,508 634 4.57 7,838 12.86 0.0227
2023-05-26 2023-03-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 13,874 420 3.12 6,944 45.97 0.0212
2023-05-12 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 13,874 420 6,944 0.0221
2023-02-02 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 13,454 519 4.01 4,757 1.21 0.0167
2022-11-07 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 12,935 985 8.24 4,700 2.40 0.0180
2022-08-01 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 11,950 -4,235 -26.17 4,590 -41.61 0.0152
2022-05-10 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 16,185 -2,659 -14.11 7,861 -15.44 0.0169
2022-02-08 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 18,844 5,539 41.63 9,296 44.15 0.0182
2021-11-12 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 13,305 342 2.64 6,449 33.22 0.0181
2021-08-13 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 12,963 1,523 13.31 4,841 19.80 0.0142
2021-05-14 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 11,440 3,403 42.34 4,041 37.31 0.0127
2021-02-09 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 8,037 1,507 23.08 2,943 61.17 0.0109
2020-11-13 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 6,530 72 1.11 1,826 19.27 0.0084
2020-08-03 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 6,458 1,798 38.58 1,531 96.28 0.0082
2020-05-15 2020-03-31 13F MONOLITHIC PWR SYS COM 609839105 4,660 -3,074 -39.75 780 -43.36 0.0056
2020-02-12 2019-12-31 13F MONOLITHIC PWR SYS COM 609839105 7,734 626 8.81 1,377 24.50 0.0064
2019-11-12 2019-09-30 13F MONOLITHIC PWR SYS COM 609839105 7,108 419 6.26 1,106 21.81 0.0062
2019-08-13 2019-06-30 13F MONOLITHIC PWR SYS COM 609839105 6,689 -140 -2.05 908 -1.84 0.0054
2019-05-15 2019-03-31 13F MONOLITHIC PWR SYS COM 609839105 6,829 1,100 19.20 925 38.89 0.0055
2019-02-14 2018-12-31 13F MONOLITHIC PWR SYS COM 609839105 5,729 -1,421 -19.87 666 -25.84 0.0047
2018-11-14 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 7,150 -511 -6.67 898 -12.30 0.0061
2018-08-13 2018-06-30 13F MONOLITHIC PWR SYS COM 609839105 7,661 -5,131 -40.11 1,024 -30.86 0.0069
2018-05-14 2018-03-31 13F MONOLITHIC PWR SYS COM 609839105 12,792 -649 -4.83 1,481 -1.92 0.0096
2018-02-14 2017-12-31 13F MONOLITHIC PWR SYS COM 609839105 13,441 5,637 72.23 1,510 81.49 0.0105
2017-11-13 2017-09-30 13F MONOLITHIC PWR SYS COM 609839105 7,804 1,652 26.85 832 40.30 0.0076
2017-08-11 2017-06-30 13F MONOLITHIC PWR SYS COM 609839105 6,152 -1,469 -19.28 593 -15.53 0.0059
2017-05-12 2017-03-31 13F/A-2 MONOLITHIC PWR SYS COM 609839105 7,621 -2,233 -22.66 702 -13.01 0.0073
2017-05-08 2017-03-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 7,621 0 702 0.0073
2017-04-25 2017-03-31 13F MONOLITHIC PWR SYS COM 609839105 7,621 702
2017-02-13 2016-12-31 13F MONOLITHIC PWR SYS COM 609839105 9,854 3,113 46.18 807 48.62 0.0089
2016-11-10 2016-09-30 13F MONOLITHIC PWR SYS COM 609839105 6,741 1,143 20.42 543 42.15 0.0076
2016-08-12 2016-06-30 13F MONOLITHIC PWR SYS COM 609839105 5,598 -88 -1.55 382 5.52 0.0049
2016-05-06 2016-03-31 13F MONOLITHIC PWR SYS COM 609839105 5,686 -971 -14.59 362 -14.62 0.0050
2016-02-05 2015-12-31 13F MONOLITHIC PWR SYS COM 609839105 6,657 2,207 49.60 424 85.96 0.0051
2015-11-06 2015-09-30 13F MONOLITHIC PWR SYS COM 609839105 4,450 -1,204 -21.29 228 -20.56 0.0032
2015-08-11 2015-06-30 13F MONOLITHIC PWR SYS COM 609839105 5,654 -2,774 -32.91 287 -35.36 0.0040
2015-05-08 2015-03-31 13F MONOLITHIC PWR SYS COM 609839105 8,428 8,428 0.00 444 0.0052
2015-01-30 2014-12-31 13F MONOLITHIC PWR SYS COM 609839105 0 -16,261 -100.00 0 -100.00
2014-11-06 2014-09-30 13F MONOLITHIC PWR SYS COM 609839105 16,261 -3,958 -19.58 716 -16.36 0.0095
2014-08-08 2014-06-30 13F MONOLITHIC PWR SYS COM 609839105 20,219 -17,760 -46.76 856 -41.85 0.0111
2014-05-07 2014-03-31 13F MONOLITHIC PWR SYS COM 609839105 37,979 37,979 58.43 1,472 102.75 0.0184
2014-02-04 2013-12-31 13F MONOLITHIC PWR SYS COM 609839105 0 -23,972 -100.00 0 -100.00
2013-11-07 2013-09-30 13F MONOLITHIC PWR SYS COM 609839105 23,972 1,705 7.66 726 35.20 0.0172
2013-07-25 2013-06-30 13F MONOLITHIC PWR SYS COM 609839105 22,267 22,267 537 0.0105
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.