Monolithic Power Systems, Inc.
US ˙ NasdaqGS ˙ US6098391054

SecurityMPWR / Monolithic Power Systems, Inc.
InstitutionLevel Four Advisory Services, Llc
Latest Disclosed Ownership7,075 shares
Latest Disclosed Value $ 7,736,191
Level Four Advisory Services, Llc reports 3.11% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On May 14, 2026 - Level Four Advisory Services, Llc filed a 13F-HR form disclosing ownership of 7,075 shares of Monolithic Power Systems, Inc. (US:MPWR) valued at $7,735,451 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 7,302 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -3.11% during the quarter. The current value of the position is $11,955,972 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)
2026-05-14 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 7,075 -227 -3.11 7,736 16.89 0.2540
2026-02-13 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 7,302 -2,084 -22.20 6,619 -23.41 0.2166
2025-11-12 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 9,386 -1,229 -11.58 8,642 11.30 0.2959
2025-08-13 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 10,615 1,283 13.75 7,764 43.46 0.2861
2025-05-14 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 9,332 823 9.67 5,413 7.49 0.2226
2025-02-12 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 8,509 646 8.22 5,035 -15.68 0.2058
2024-11-14 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 7,863 -413 -4.99 5,971 -12.19 0.2514
2024-08-09 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 8,276 -283 -3.31 6,801 25.97 0.3066
2024-05-13 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 8,559 594 7.46 5,399 7.44 0.2966
2024-02-08 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 7,965 -111 -1.37 5,024 34.69 0.2819
2023-11-13 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 8,076 222 2.83 3,731 -12.09 0.2405
2023-07-10 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 7,854 152 1.97 4,243 10.06 0.2549
2023-06-05 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 7,702 -735 -8.71 3,855 29.23 0.2529
2023-02-13 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 8,437 -783 -8.49 2,984 -10.98 0.2215
2022-11-07 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 9,220 39 0.42 3,351 -4.96 0.3257
2022-08-08 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 9,181 -172 -1.84 3,526 -22.39 0.3326
2022-05-10 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 9,353 1,314 16.35 4,543 14.55 0.3559
2022-02-11 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 8,039 -3,543 -30.59 3,966 -29.36 0.3024
2021-10-12 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 11,582 -217 -1.84 5,614 27.42 0.5838
2021-08-09 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 11,799 535 4.75 4,406 10.73 0.3047
2021-05-10 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 11,264 378 3.47 3,979 -0.20 0.3090
2021-02-10 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 10,886 -2,397 -18.05 3,987 7.35 0.3200
2020-11-02 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 13,283 -755 -5.38 3,714 11.53 0.2861
2020-08-17 2020-06-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 14,038 343 2.50 3,330 44.78 0.2576
2020-07-27 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 1,171 -12,524 278 697,423.5468
2020-05-13 2020-03-31 13F MONOLITHIC PWR SYS COM 609839105 13,695 -255 -1.83 2,300 -85.16 0.2759
2020-02-13 2019-12-31 13F MONOLITHIC PWR SYS COM 609839105 13,950 2,184 18.56 15,502 746.64 0.6138
2019-11-12 2019-09-30 13F MONOLITHIC PWR SYS COM 609839105 11,766 429 3.78 1,831 18.82 0.1895
2019-08-14 2019-06-30 13F MONOLITHIC PWR SYS COM 609839105 11,337 18 0.16 1,541 0.46 0.1556
2019-05-15 2019-03-31 13F MONOLITHIC PWR SYS COM 609839105 11,319 1,171 11.54 1,534 30.00 0.1690
2019-02-07 2018-12-31 13F MONOLITHIC PWR SYS COM 609839105 10,148 2,817 38.43 1,180 28.26 0.1471
2018-11-14 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 7,331 7,331 920 0.0994
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.