Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionComerica Bank
Latest Disclosed Ownership7,317 shares
Latest Disclosed Value $ 6,631,865
Comerica Bank reports 32.91% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On January 29, 2026 - Comerica Bank filed a 13F-HR form disclosing ownership of 7,317 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $6,631,865 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 10,906 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -32.91% 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)
2026-01-29 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 7,317 -3,589 -32.91 6,632 -33.95 0.0265
2025-11-14 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 10,906 1,000 10.09 10,040 38.58 0.0378
2025-08-14 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 9,906 2,216 28.82 7,245 62.42 0.0281
2025-05-14 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 7,690 -2,819 -26.82 4,460 -28.27 0.0187
2025-02-14 2024-12-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 10,509 -131 -1.23 6,219 -36.78 0.0251
2025-02-14 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 10,509 -131 6,219 0.0208
2024-11-14 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 10,640 52 0.49 9,837 13.06 0.0389
2024-08-15 2024-06-30 13F MONOLITHIC POWER SYSTEMS COMMON 609839105 10,588 -425 -3.86 8,700 16.62 0.0362
2024-05-16 2024-03-31 13F MONOLITHIC POWER SYSTEMS COMMON 609839105 11,013 163 1.50 7,460 9.02 0.0321
2024-02-14 2023-12-31 13F MONOLITHIC POWER SYSTEMS COMMON 609839105 10,850 326 3.10 6,844 40.74 0.0315
2023-11-21 2023-09-30 13F MONOLITHIC PWR SYS COMMON 609839105 10,524 10,524 4,862 0.0253
2023-08-22 2023-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 0 -24,417 -100.00 0 -100.00
2023-01-26 2022-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 24,417 13,860 131.29 10 -99.74 0.0763
2022-10-28 2022-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 10,557 -22 -0.21 3,494 -22.53 0.0295
2022-08-02 2022-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 10,579 180 1.73 4,510 0.33 0.0370
2022-04-27 2022-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 10,399 -106 -1.01 4,495 14.17 0.0326
2022-02-18 2021-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 10,505 -851 -7.49 3,937 -32.14 0.0290
2021-11-22 2021-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 11,356 -2,283 -16.74 5,802 -8.95 0.0349
2021-08-26 2021-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 13,639 -682 -4.76 6,372 16.83 0.0380
2021-04-28 2021-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 14,321 -11,123 -43.72 5,454 -45.99 0.0325
2021-01-28 2020-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 25,444 -823 -3.13 10,099 19.60 0.0641
2020-10-30 2020-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 26,267 32 0.12 8,444 29.13 0.0613
2020-07-31 2020-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 26,235 2,122 8.80 6,539 45.76 0.0504
2020-05-01 2020-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 24,113 15 0.06 4,486 4.30 0.0411
2020-02-07 2019-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 24,098 310 1.30 4,301 20.34 0.0326
2019-10-31 2019-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 23,788 244 1.04 3,574 6.34 0.0282
2019-08-02 2019-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 23,544 -2,511 -9.64 3,361 -13.35 0.0269
2019-05-02 2019-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 26,055 -177 -0.67 3,879 16.94 0.0314
2019-02-06 2018-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 26,232 659 2.58 3,317 12.82 0.0282
2018-11-01 2018-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 25,573 -4,551 -15.11 2,940 -30.95 0.0237
2018-08-01 2018-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 30,124 -997 -3.20 4,258 13.79 0.0298
2018-05-01 2018-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 31,121 223 0.72 3,742 0.94 0.0267
2018-02-02 2017-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 30,898 90 0.29 3,707 0.32 0.0247
2017-11-06 2017-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 30,808 95 0.31 3,695 14.75 0.0267
2017-08-03 2017-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 30,713 372 1.23 3,220 12.35 0.0241
2017-05-03 2017-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 30,341 1,572 5.46 2,866 14.32 0.0218
2017-02-08 2016-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 28,769 -8,326 -22.45 2,507 -8.34 0.0198
2016-08-11 2016-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 37,095 -548 -1.46 2,735 12.32 0.0236
2016-05-11 2016-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 37,643 786 2.13 2,435 15.18 0.0217
2016-02-05 2015-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 36,857 -72 -0.19 2,114 11.79 0.0207
2015-11-12 2015-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 36,929 -37,521 -50.40 1,891 -49.92 0.0179
2015-08-13 2015-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 74,450 38,569 107.49 3,776 99.89 0.0162
2015-05-15 2015-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 35,881 -34,107 -48.73 1,889 -45.75 0.0160
2015-02-13 2014-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 69,988 34,489 97.15 3,482 122.63 0.0151
2014-10-21 2014-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 35,499 1,068 3.10 1,564 7.27 0.0138
2014-08-12 2014-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 34,431 -901 -2.55 1,458 6.42 0.0124
2014-05-15 2014-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 35,332 -763 -2.11 1,370 9.51 0.0105
2014-02-11 2013-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 36,095 -973 -2.62 1,251 11.40 0.0097
2013-11-12 2013-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 37,068 2,390 6.89 1,123 34.33 0.0078
2013-08-13 2013-06-30 13F/A-1 MONOLITHIC POWER SYSTEMS COM 609839105 34,678 34,678 836 0.0068
2013-08-08 2013-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 172,766 4,164
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.