Monolithic Power Systems, Inc.
US ˙ NasdaqGS ˙ US6098391054

SecurityMPWR / Monolithic Power Systems, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership153,767 shares
Latest Disclosed Value $ 168,060,370
Dimensional Fund Advisors Lp reports 1.81% increase in ownership of MPWR / Monolithic Power Systems, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 153,767 shares of Monolithic Power Systems, Inc. (US:MPWR) valued at $168,121,149 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 151,038 shares of Monolithic Power Systems, Inc.. This represents a change in shares of 1.81% during the quarter. The current value of the position is $259,849,316 USD.

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)
2026-05-07 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 153,767 2,729 1.81 168,060 22.76 0.0075
2026-02-12 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 151,038 -5,539 -3.54 136,905 -5.00 0.0287
2025-11-12 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 156,577 6,216 4.13 144,113 31.03 0.0309
2025-08-12 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 150,361 -10,188 -6.35 109,983 18.13 0.0255
2025-05-13 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 160,549 962 0.60 93,105 -1.41 0.0231
2025-02-13 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 159,587 10,761 7.23 94,440 -31.36 0.0227
2024-11-07 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 148,826 -2,580 -1.70 137,592 10.60 0.0334
2024-08-09 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 151,406 2,599 1.75 124,405 23.41 0.0325
2024-05-10 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 148,807 -845 -0.56 100,805 6.79 0.0273
2024-02-07 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 149,652 -3,741 -2.44 94,399 33.21 0.0276
2023-11-09 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 153,393 7,343 5.03 70,864 -10.19 0.0232
2023-08-09 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 146,050 6,839 4.91 78,901 13.23 0.0251
2023-05-12 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 139,211 2,662 1.95 69,680 145,066.67 0.0235
2023-02-09 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 136,549 2,666 1.99 48 -99.90 0.0143
2022-11-10 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 133,883 2,263 1.72 48,656 -3.74 0.0187
2022-08-12 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 131,620 -16,350 -11.05 50,548 -29.67 0.0181
2022-05-13 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 147,970 -1,252 -0.84 71,868 -2.37 0.0221
2022-02-09 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 149,222 -578 -0.39 73,614 1.39 0.0223
2021-11-12 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 149,800 -2,142 -1.41 72,608 27.95 0.0234
2021-08-12 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 151,942 -7,833 -4.90 56,745 0.67 0.0180
2021-05-14 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 159,775 -4,919 -2.99 56,367 -6.54 0.0186
2021-03-08 2020-12-31 13F/A-2 MONOLITHIC PWR SYS COM 609839105 164,694 -14,692 -8.19 60,313 20.25 0.0218
2021-02-11 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 164,694 -14,692 60,313 21,781.8498
2020-11-12 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 179,386 230 0.13 50,155 18.15 0.0213
2020-08-13 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 179,156 -7,895 -4.22 42,451 35.55 0.0187
2020-05-14 2020-03-31 13F MONOLITHIC PWR SYS COM 609839105 187,051 -8,166 -4.18 31,318 -9.88 0.0163
2020-02-14 2019-12-31 13F MONOLITHIC PWR SYS COM 609839105 195,217 3,398 1.77 34,753 16.41 0.0127
2019-11-12 2019-09-30 13F MONOLITHIC PWR SYS COM 609839105 191,819 1,343 0.71 29,854 15.44 0.0116
2019-08-13 2019-06-30 13F MONOLITHIC PWR SYS COM 609839105 190,476 -62,975 -24.85 25,860 -24.69 0.0100
2019-08-12 2019-03-31 13F/A-2 MONOLITHIC PWR SYS COM 609839105 253,451 7,537 3.06 34,340 20.12 0.0137
2019-05-10 2019-03-31 13F MONOLITHIC PWR SYS COM 609839105 253,451 7,537 34,340
2019-02-26 2018-12-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 245,914 8,939 3.77 28,587 -3.90 0.0130
2019-02-13 2018-12-31 13F MONOLITHIC PWR SYS COM 609839105 245,914 8,939 28,587
2018-11-13 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 236,975 4,693 2.02 29,748 -4.19 0.0113
2018-08-10 2018-06-30 13F MONOLITHIC PWR SYS COM 609839105 232,282 4,629 2.03 31,050 17.81 0.0124
2018-05-11 2018-03-31 13F MONOLITHIC PWR SYS COM 609839105 227,653 -12,130 -5.06 26,355 -2.18 0.0110
2018-02-12 2017-12-31 13F MONOLITHIC PWR SYS COM 609839105 239,783 -17,908 -6.95 26,943 -1.87 0.0112
2017-11-13 2017-09-30 13F MONOLITHIC PWR SYS COM 609839105 257,691 -15,657 -5.73 27,457 4.20 0.0120
2017-08-11 2017-06-30 13F MONOLITHIC PWR SYS COM 609839105 273,348 -31,661 -10.38 26,351 -6.19 0.0122
2017-05-12 2017-03-31 13F MONOLITHIC PWR SYS COM 609839105 305,009 -18,452 -5.70 28,091 6.00 0.0134
2017-02-09 2016-12-31 13F MONOLITHIC PWR SYS COM 609839105 323,461 4,174 1.31 26,502 3.11 0.0132
2016-11-10 2016-09-30 13F MONOLITHIC PWR SYS COM 609839105 319,287 -111,057 -25.81 25,702 -12.58 0.0139
2016-08-09 2016-06-30 13F MONOLITHIC PWR SYS COM 609839105 430,344 -52,332 -10.84 29,400 -4.29 0.0169
2016-05-13 2016-03-31 13F MONOLITHIC PWR SYS COM 609839105 482,676 -48 -0.01 30,717 -0.12 0.0184
2016-02-10 2015-12-31 13F MONOLITHIC PWR SYS COM 609839105 482,724 -2,458 -0.51 30,755 23.81 0.0192
2015-11-13 2015-09-30 13F MONOLITHIC PWR SYS COM 609839105 485,182 -4,942 -1.01 24,841 -0.06 0.0163
2015-08-14 2015-06-30 13F MONOLITHIC PWR SYS COM 609839105 490,124 -74,248 -13.16 24,855 -16.35 0.0152
2015-05-14 2015-03-31 13F MONOLITHIC PWR SYS COM 609839105 564,372 -266,189 -32.05 29,714 -28.07 0.0188
2015-02-06 2014-12-31 13F MONOLITHIC PWR SYS COM 609839105 830,561 -627 -0.08 41,312 12.83 0.0271
2014-11-13 2014-09-30 13F MONOLITHIC PWR SYS COM 609839105 831,188 -2,100 -0.25 36,615 3.76 0.0259
2014-08-08 2014-06-30 13F MONOLITHIC PWR SYS COM 609839105 833,288 5 0.00 35,289 9.24 0.0245
2014-05-14 2014-03-31 13F MONOLITHIC PWR SYS COM 609839105 833,283 -65,828 -7.32 32,305 3.66 0.0241
2014-02-12 2013-12-31 13F MONOLITHIC PWR SYS COM 609839105 899,111 -11,132 -1.22 31,163 13.07 0.0243
2013-11-13 2013-09-30 13F MONOLITHIC PWR SYS COM 609839105 910,243 2,269 0.25 27,561 25.90 0.0239
2013-08-15 2013-06-30 13F MONOLITHIC PWR SYS COM 609839105 907,974 907,974 21,891 0.0206
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.