Monolithic Power Systems, Inc.
US ˙ NasdaqGS ˙ US6098391054

SecurityMPWR / Monolithic Power Systems, Inc.
InstitutionPrivate Advisor Group, LLC
Latest Disclosed Ownership4,077 shares
Latest Disclosed Value $ 4,457,834
Private Advisor Group, LLC reports 11.50% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On April 24, 2026 - Private Advisor Group, LLC filed a 13F-HR form disclosing ownership of 4,077 shares of Monolithic Power Systems, Inc. (US:MPWR) valued at $4,457,588 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 4,607 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -11.50% during the quarter. The current value of the position is $6,889,682 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)
2026-04-24 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 4,077 -530 -11.50 4,458 6.75 0.0198
2026-02-17 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 4,607 -850 -15.58 4,176 -16.90 0.0188
2025-11-13 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 5,457 -512 -8.58 5,024 15.10 0.0247
2025-08-11 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 5,969 489 8.92 4,366 37.35 0.0235
2025-05-05 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 5,480 4,970 974.51 3,178 952.32 0.0192
2025-02-03 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 510 -239 -31.91 302 -56.36 0.0017
2024-10-22 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 749 -54 -6.72 692 5.01 0.0043
2024-08-05 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 803 178 28.48 660 55.79 0.0044
2024-04-30 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 625 6 0.97 423 8.46 0.0030
2024-02-06 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 619 619 391 0.0030
2022-10-14 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 0 -1,536 -100.00 0 -100.00
2022-07-13 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 1,536 153 11.06 590 -12.20 0.0053
2022-05-12 2022-03-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 1,383 330 31.34 672 29.48 0.0051
2022-05-10 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 1,053 0 519 0.0039
2022-02-10 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 1,053 -757 -41.82 519 -40.82 0.0039
2021-10-14 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 1,810 993 121.54 877 187.54 0.0056
2021-08-12 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 817 128 18.58 305 25.51 0.0027
2021-04-22 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 689 -3,319 -82.81 243 -83.45 0.0023
2021-04-01 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 4,008 651 19.39 1,468 56.34 0.0153
2020-11-02 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 3,357 -174 -4.93 939 12.19 0.0122
2020-08-17 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 3,531 42 1.20 837 43.32 0.0116
2020-05-12 2020-03-31 13F MONOLITHIC PWR SYS COM 609839105 3,489 -1,967 -36.05 584 -39.86 0.0107
2020-02-10 2019-12-31 13F MONOLITHIC PWR SYS COM 609839105 5,456 2,271 71.30 971 95.77 0.0151
2019-11-13 2019-09-30 13F MONOLITHIC PWR SYS COM 609839105 3,185 1,366 75.10 496 107.53 0.0077
2019-08-14 2019-06-30 13F MONOLITHIC PWR SYS COM 609839105 1,819 -2,171 -54.41 239 -55.08 0.0043
2019-05-13 2019-03-31 13F MONOLITHIC PWR SYS COM 609839105 3,990 1,966 97.13 532 126.38 0.0105
2019-02-08 2018-12-31 13F MONOLITHIC PWR SYS COM 609839105 2,024 -1,957 -49.16 235 -53.00 0.0057
2018-11-01 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 3,981 1,018 34.36 500 25.63 0.0102
2018-08-09 2018-06-30 13F MONOLITHIC PWR SYS COM 609839105 2,963 2,963 398 0.0065
2018-05-09 2018-03-31 13F MONOLITHIC PWR SYS COM 609839105 0 -2,146 -100.00 0 -100.00
2018-02-07 2017-12-31 13F MONOLITHIC PWR SYS COM 609839105 2,146 -1,094 -33.77 260 -26.14 0.0110
2017-11-13 2017-09-30 13F MONOLITHIC PWR SYS COM 609839105 3,240 896 38.23 352 53.71 0.0087
2017-08-10 2017-06-30 13F MONOLITHIC PWR SYS COM 609839105 2,344 2,344 229 0.0062
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.