Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionStandard Life Aberdeen plc
Latest Disclosed Ownership39,422 shares
Latest Disclosed Value $ 43,102,044
Standard Life Aberdeen plc reports 4.56% increase in ownership of MPWR / Monolithic Power Systems, Inc.

On April 29, 2026 - Standard Life Aberdeen plc filed a 13F-HR form disclosing ownership of 39,422 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $43,102,044 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 16, 2026 disclosing 37,703 shares of Monolithic Power Systems, Inc.. This represents a change in shares of 4.56% 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)
2026-04-29 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 39,422 1,719 4.56 43,102 26.13 0.0378
2026-01-16 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 37,703 -228 -0.60 34,172 -0.38 0.0529
2025-11-07 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 37,931 42 0.11 34,304 22.40 0.0543
2025-07-24 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 37,889 1,600 4.41 28,026 37.73 0.0477
2025-05-13 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 36,289 19,403 114.91 20,350 101.30 0.0397
2025-01-24 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 16,886 -2,177 -11.42 10,109 -42.29 0.0190
2024-10-25 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 19,063 6,646 53.52 17,517 71.69 0.0321
2024-08-09 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 12,417 -9,429 -43.16 10,203 -31.06 0.0196
2024-05-09 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 21,846 1,031 4.95 14,799 12.71 0.0290
2024-01-31 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 20,815 8,294 66.24 13,130 126.99 0.0285
2023-11-07 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 12,521 -424 -3.28 5,785 -17.29 0.0148
2024-06-20 2023-06-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 12,945 -130 -0.99 6,993 6.86 0.0163
2023-08-04 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 12,945 -130 6,993 0.0163
2024-06-20 2023-03-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 13,075 1,485 12.81 6,545 59.69 0.0164
2023-04-28 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 13,075 1,485 6,545 0.0164
2024-06-20 2022-12-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 11,590 379 3.38 4,098 0.59 0.0111
2023-02-10 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 11,590 379 4,098 0.0111
2022-11-10 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 11,211 356 3.28 4,074 -3.62 0.0121
2022-08-05 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 10,855 -1,071 -8.98 4,227 -28.22 0.0133
2022-05-04 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 11,926 -1,763 -12.88 5,889 -12.79 0.0151
2022-02-10 2021-12-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 13,689 32 0.23 6,753 1.23 0.0148
2022-02-08 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 13,689 32 6,753 0.0049
2021-11-15 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 13,657 -675 -4.71 6,671 24.60 0.0150
2021-08-10 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 14,332 -537 -3.61 5,354 1.94 0.0117
2021-05-06 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 14,869 13,345 875.66 5,252 841.22 0.0119
2021-02-10 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 1,524 1,524 558 0.0014
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.