Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionPembroke Management, LTD
Latest Disclosed Ownership34,397 shares
Latest Disclosed Value $ 37,607,960
Pembroke Management, LTD reports 35.27% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On May 14, 2026 - Pembroke Management, LTD filed a 13F-HR form disclosing ownership of 34,397 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $37,607,960 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 53,142 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -35.27% 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)
2026-05-14 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 34,397 -18,745 -35.27 37,608 -21.92 5.4391
2026-02-12 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 53,142 -794 -1.47 48,166 -3.00 4.9761
2025-10-28 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 53,936 -1,033 -1.88 49,656 23.51 4.9271
2025-08-07 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 54,969 12,750 30.20 40,203 64.19 4.8633
2025-05-15 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 42,219 4,250 11.19 24,486 8.99 3.5706
2025-01-31 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 37,969 2,444 6.88 22,466 -31.59 2.8013
2024-10-29 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 35,525 -5,971 -14.39 32,843 -3.68 4.1886
2024-08-01 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 41,496 -10,332 -19.94 34,096 -2.89 4.5804
2024-05-08 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 51,828 -3,069 -5.59 35,109 1.39 4.1311
2024-02-13 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 54,897 -4,419 -7.45 34,628 26.36 4.2990
2023-11-08 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 59,316 -7,247 -10.89 27,404 -23.79 3.7415
2023-07-27 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 66,563 -4,782 -6.70 35,959 0.69 3.8751
2023-05-03 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 71,345 -5,369 -7.00 35,711 31.65 3.9051
2023-02-01 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 76,714 22,595 41.75 27,127 37.93 2.9014
2022-10-24 2022-09-30 13F MONOLITHIC POWER COM 609839105 54,119 -800 -1.46 19,666 -6.76 2.1830
2022-07-26 2022-06-30 13F MONOLITHIC POWER COM 609839105 54,919 8,491 18.29 21,091 -6.47 2.1806
2022-05-06 2022-03-31 13F MONOLITHIC POWER COM 609839105 46,428 975 2.15 22,549 0.56 1.8852
2022-02-09 2021-12-31 13F MONOLITHIC POWER COM 609839105 45,453 1,754 4.01 22,423 5.87 1.6431
2021-11-08 2021-09-30 13F MONOLITHIC POWER COM 609839105 43,699 -2,143 -4.67 21,180 23.71 1.5965
2021-08-11 2021-06-30 13F/A-1 MONOLITHIC POWER COM 609839105 45,842 -4,627 -9.17 17,120 -3.96 1.3423
2021-07-27 2021-06-30 13F MONOLITHIC POWER COM 609839105 50,469 0 17,826 1.4832
2021-05-06 2021-03-31 13F MONOLITHIC POWER COM 609839105 50,469 -27,138 -34.97 17,826 -37.28 1.4832
2021-02-05 2020-12-31 13F MONOLITHIC POWER COM 609839105 77,607 -12,434 -13.81 28,422 12.89 2.3839
2020-11-04 2020-09-30 13F MONOLITHIC POWER COM 609839105 90,041 -706 -0.78 25,176 17.06 2.7425
2020-08-03 2020-06-30 13F MONOLITHIC POWER COM 609839105 90,747 -17,889 -16.47 21,507 18.22 2.5282
2020-04-28 2020-03-31 13F MONOLITHIC POWER COM 609839105 108,636 17,763 19.55 18,192 12.46 2.8881
2020-01-29 2019-12-31 13F MONOLITHIC POWER COM 609839105 90,873 -13,140 -12.63 16,177 -0.07 1.3761
2019-10-29 2019-09-30 13F MONOLITHIC POWER COM 609839105 104,013 -6,724 -6.07 16,188 7.66 1.7610
2019-07-24 2019-06-30 13F MONOLITHIC POWER COM 609839105 110,737 1,476 1.35 15,036 1.57 1.5876
2019-04-12 2019-03-31 13F MONOLITHIC POWER COM 609839105 109,261 -30,752 -21.96 14,804 -9.05 1.6009
2019-01-25 2018-12-31 13F MONOLITHIC POWER COM 609839105 140,013 -22,993 -14.11 16,277 -20.45 2.2193
2018-10-29 2018-09-30 13F MONOLITHIC POWER COM 609839105 163,006 -25,720 -13.63 20,462 -18.89 2.1027
2018-07-27 2018-06-30 13F MONOLITHIC POWER COM 609839105 188,726 24,799 15.13 25,227 32.93 2.5788
2018-04-23 2018-03-31 13F MONOLITHIC POWER COM 609839105 163,927 50,027 43.92 18,978 48.30 2.0109
2018-01-31 2017-12-31 13F MONOLITHIC POWER COM 609839105 113,900 15,900 16.22 12,797 22.55 1.3144
2017-11-08 2017-09-30 13F MONOLITHIC POWER COM 609839105 98,000 5,200 5.60 10,442 16.74 1.0201
2017-07-25 2017-06-30 13F MONOLITHIC POWER COM 609839105 92,800 92,800 8,945 0.7961
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.