Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionPrincipal Financial Group Inc
Latest Disclosed Ownership174,199 shares
Latest Disclosed Value $ 190,462,749
Principal Financial Group Inc reports 4.15% increase in ownership of MPWR / Monolithic Power Systems, Inc.

On May 4, 2026 - Principal Financial Group Inc filed a 13F-HR form disclosing ownership of 174,199 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $190,462,749 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 167,265 shares of Monolithic Power Systems, Inc.. This represents a change in shares of 4.15% 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)
2026-05-04 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 174,199 6,934 4.15 190,463 25.63 0.1017
2026-02-02 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 167,265 -2,447 -1.44 151,604 -2.97 0.0774
2025-11-04 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 169,712 -133 -0.08 156,246 25.78 0.0788
2025-08-08 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 169,845 -4,797 -2.75 124,223 22.64 0.0657
2025-04-28 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 174,642 231 0.13 101,290 -1.85 0.0568
2025-01-31 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 174,411 93,347 115.15 103,200 37.70 0.0563
2024-10-31 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 81,064 -38,716 -32.32 74,945 -23.85 0.0413
2024-07-29 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 119,780 -9,963 -7.68 98,421 11.98 0.0584
2024-04-29 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 129,743 -12,260 -8.63 87,891 -1.88 0.0517
2024-02-07 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 142,003 13,676 10.66 89,573 51.09 0.0571
2023-11-02 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 128,327 -61,432 -32.37 59,287 -42.17 0.0426
2023-08-07 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 189,759 16,440 9.49 102,512 18.17 0.0701
2023-05-09 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 173,319 33,929 24.34 86,752 76.01 0.0620
2023-02-09 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 139,390 -2,665 -1.88 49,290 -4.53 0.0371
2022-11-09 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 142,055 -2,727 -1.88 51,629 -7.14 0.0410
2022-08-10 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 144,782 6,016 4.34 55,600 -17.50 0.0411
2022-05-09 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 138,766 -2,417 -1.71 67,395 -3.06 0.0267
2022-05-09 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 134,277 65,215
2022-02-09 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 141,183 -4,526 -3.11 69,523 -1.56 0.0415
2021-11-09 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 145,709 6,162 4.42 70,623 35.52 0.0461
2021-08-10 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 139,547 18,551 15.33 52,114 21.94 0.0337
2021-05-10 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 120,996 -84,175 -41.03 42,737 -43.12 0.0302
2021-02-23 2020-12-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 205,171 -8,982 -4.19 75,139 25.48 0.0557
2021-02-08 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 205,175 -8,978 75,141 29,561.6274
2020-11-06 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 214,153 -4,194 -1.92 59,879 15.71 0.0504
2020-08-05 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 218,347 6,707 3.17 51,749 46.02 0.0459
2020-05-12 2020-03-31 13F MONOLITHIC PWR SYS COM 609839105 211,640 -43,910 -17.18 35,439 -22.10 0.0392
2020-02-05 2019-12-31 13F MONOLITHIC PWR SYS COM 609839105 255,550 82,830 47.96 45,494 69.25 0.0379
2019-11-13 2019-09-30 13F MONOLITHIC PWR SYS COM 609839105 172,720 -388 -0.22 26,880 14.36 0.0237
2019-08-12 2019-06-30 13F MONOLITHIC PWR SYS COM 609839105 173,108 -2,592 -1.48 23,505 -1.26 0.0211
2019-05-10 2019-03-31 13F MONOLITHIC PWR SYS COM 609839105 175,700 7,832 4.67 23,806 21.99 0.0222
2019-02-14 2018-12-31 13F MONOLITHIC PWR SYS COM 609839105 167,868 -7,969 -4.53 19,515 -11.59 0.0208
2018-11-14 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 175,837 2,766 1.60 22,073 -4.59 0.0195
2018-08-13 2018-06-30 13F MONOLITHIC PWR SYS COM 609839105 173,071 4,806 2.86 23,135 18.76 0.0213
2018-05-14 2018-03-31 13F MONOLITHIC PWR SYS COM 609839105 168,265 6,251 3.86 19,480 7.01 0.0187
2018-02-12 2017-12-31 13F MONOLITHIC PWR SYS COM 609839105 162,014 328 0.20 18,204 5.67 0.0168
2017-11-02 2017-09-30 13F MONOLITHIC PWR SYS COM 609839105 161,686 947 0.59 17,228 11.18 0.0167
2017-08-08 2017-06-30 13F MONOLITHIC PWR SYS COM 609839105 160,739 6,774 4.40 15,496 9.28 0.0155
2017-05-11 2017-03-31 13F MONOLITHIC PWR SYS COM 609839105 153,965 5,711 3.85 14,180 16.75 0.0171
2017-02-13 2016-12-31 13F MONOLITHIC PWR SYS COM 609839105 148,254 64 0.04 12,146 1.82 0.0154
2016-11-10 2016-09-30 13F MONOLITHIC PWR SYS COM 609839105 148,190 -117,994 -44.33 11,929 -34.41 0.0158
2016-08-09 2016-06-30 13F MONOLITHIC PWR SYS COM 609839105 266,184 7,518 2.91 18,186 10.47 0.0254
2016-05-10 2016-03-31 13F MONOLITHIC PWR SYS COM 609839105 258,666 13,989 5.72 16,462 5.61 0.0239
2016-02-09 2015-12-31 13F MONOLITHIC PWR SYS COM 609839105 244,677 10,163 4.33 15,588 29.82 0.0232
2015-11-12 2015-09-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 234,514 3,626 1.57 12,007 2.55 0.0189
2015-11-09 2015-09-30 13F MONOLITHIC PWR SYS COM 609839105 234,514 12,007
2015-08-10 2015-06-30 13F MONOLITHIC PWR SYS COM 609839105 230,888 23 0.01 11,708 -3.68 0.0175
2015-05-14 2015-03-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 230,865 5,128 2.27 12,155 8.26 0.0181
2015-05-12 2015-03-31 13F MONOLITHIC PWR SYS COM 609839105 230,865 12,155
2015-02-12 2014-12-31 13F MONOLITHIC PWR SYS COM 609839105 225,737 764 0.34 11,228 13.30 0.0174
2014-11-13 2014-09-30 13F MONOLITHIC PWR SYS COM 609839105 224,973 2,808 1.26 9,910 5.32 0.0168
2014-08-12 2014-06-30 13F MONOLITHIC PWR SYS COM 609839105 222,165 -3,074 -1.36 9,409 7.75 0.0158
2014-05-13 2014-03-31 13F MONOLITHIC PWR SYS COM 609839105 225,239 12,142 5.70 8,732 18.22 0.0156
2014-02-12 2013-12-31 13F MONOLITHIC PWR SYS COM 609839105 213,097 15,512 7.85 7,386 23.45 0.0138
2013-11-05 2013-09-30 13F MONOLITHIC PWR SYS COM 609839105 197,585 15,601 8.57 5,983 36.35 0.0124
2013-08-12 2013-06-30 13F MONOLITHIC PWR SYS COM 609839105 181,984 181,984 4,388 0.0097
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.