Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionStratos Wealth Partners, LTD.
Latest Disclosed Ownership9,260 shares
Latest Disclosed Value $ 10,124,759
Stratos Wealth Partners, LTD. reports 0.77% increase in ownership of MPWR / Monolithic Power Systems, Inc.

On April 28, 2026 - Stratos Wealth Partners, LTD. filed a 13F-HR form disclosing ownership of 9,260 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $10,124,759 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 9,189 shares of Monolithic Power Systems, Inc.. This represents a change in shares of 0.77% 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)
2026-04-28 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 9,260 71 0.77 10,125 21.57 0.1151
2026-01-20 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 9,189 -206 -2.19 8,329 -3.72 0.0942
2025-11-06 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 9,395 217 2.36 8,650 28.85 0.1020
2025-07-29 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 9,178 -288 -3.04 6,713 22.28 0.0907
2025-04-30 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 9,466 114 1.22 5,490 -0.78 0.0836
2025-01-27 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 9,352 -157 -1.65 5,534 -37.06 0.0781
2024-10-17 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 9,509 188 2.02 8,791 14.78 0.1269
2024-07-24 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 9,321 242 2.67 7,659 24.54 0.1226
2024-04-16 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 9,079 256 2.90 6,150 10.51 0.1020
2024-01-24 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 8,823 188 2.18 5,565 39.51 0.1038
2023-10-24 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 8,635 361 4.36 3,989 -10.74 0.0859
2023-07-18 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 8,274 379 4.80 4,470 13.11 0.1012
2023-04-27 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 7,895 -253 -3.11 3,952 37.14 0.1054
2023-01-19 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 8,148 -13 -0.16 2,881 -2.87 0.0729
2022-10-24 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 8,161 74 0.92 2,966 -4.51 0.0828
2022-07-22 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 8,087 121 1.52 3,106 -19.72 0.0783
2022-04-26 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 7,966 141 1.80 3,869 0.23 0.0864
2022-01-14 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 7,825 -1,146 -12.77 3,860 -11.22 0.0855
2021-10-19 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 8,971 1,515 20.32 4,348 56.12 0.1107
2021-07-19 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 7,456 98 1.33 2,785 7.16 0.0693
2021-04-27 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 7,358 474 6.89 2,599 3.09 0.0719
2021-01-29 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 6,884 557 8.80 2,521 42.51 0.0749
2020-10-29 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 6,327 6,327 1,769 0.0581
2019-02-08 2018-12-31 13F MONOLITHIC PWR SYS COM 609839105 0 -416 -100.00 0 -100.00
2018-11-02 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 416 416 52 0.0023
2018-08-13 2018-06-30 13F MONOLITHIC PWR SYS COM 609839105 0 -416 -100.00 0 -100.00
2018-05-10 2018-03-31 13F MONOLITHIC PWR SYS COM 609839105 416 195 88.24 48 92.00 0.0020
2018-02-09 2017-12-31 13F MONOLITHIC PWR SYS COM 609839105 221 221 25 0.0011
2015-05-13 2015-03-31 13F MONOLITHIC PWR SYS COM 609839105 0 -214 -100.00 0 -100.00
2015-02-09 2014-12-31 13F MONOLITHIC PWR SYS COM 609839105 214 214 11 0.0017
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.