Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionAPG Asset Management N.V.
Latest Disclosed Ownership24,660 shares
Latest Disclosed Value $ 23,400,461
APG Asset Management N.V. reports 10.58% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On May 13, 2026 - APG Asset Management N.V. filed a 13F-HR form disclosing ownership of 24,660 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $23,400,461 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 27,578 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -10.58% 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)
2026-05-13 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 24,660 -2,918 -10.58 23,400 9.95 0.0741
2026-02-12 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 27,578 -916 -3.21 21,283 -4.67 0.0604
2025-11-12 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 28,494 0 0.00 22,326 25.75 0.0627
2025-08-12 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 28,494 887 3.21 17,753 19.77 0.0526
2025-05-14 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 27,607 -928 -3.25 14,823 -9.10 0.0460
2025-02-13 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 28,535 24,175 554.47 16,305 351.54 0.0454
2024-11-14 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 4,360 -25,003 -85.15 3,612 -83.96 0.0240
2024-08-14 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 29,363 5,445 22.77 22,512 50.05 0.0402
2024-05-14 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 23,918 -9,604 -28.65 15,002 -21.62 0.0263
2024-02-13 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 33,522 -1,745 -4.95 19,142 17.48 0.0373
2023-11-14 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 35,267 -4,244 -10.74 16,293 -16.72 0.0333
2023-08-14 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 39,511 -9,194 -18.88 19,565 -12.81 0.0395
2023-05-12 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 48,705 -1,597 -3.17 22,439 131,888.24 0.0476
2023-02-14 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 50,302 30,350 152.12 18 -99.77 0.0338
2022-11-14 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 19,952 -6,746 -25.27 7,401 -24.53 0.0191
2022-08-12 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 26,698 6,803 34.19 9,807 12.93 0.0230
2022-05-12 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 19,895 8,600 76.14 8,684 77.22 0.0164
2022-02-11 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 11,295 -1,800 -13.75 4,900 -10.52 0.0083
2021-11-15 2021-09-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 13,095 7,500 134.05 5,476 210.78 0.0097
2021-11-15 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 13,095 7,500 5,476 0.0098
2021-08-13 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 5,595 -600 -9.69 1,762 -5.37 0.0030
2021-05-14 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 6,195 -64,877 -91.28 1,862 -91.25 0.0032
2021-02-12 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 71,072 61,593 649.78 21,273 841.28 0.0347
2020-11-12 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 9,479 6,579 226.86 2,260 269.28 0.0039
2020-08-14 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 2,900 2,900 612 0.0011
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.