Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionBaird Financial Group, Inc.
Latest Disclosed Ownership74,271 shares
Latest Disclosed Value $ 81,204,198
Baird Financial Group, Inc. reports 23.91% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On May 14, 2026 - Baird Financial Group, Inc. filed a 13F-HR form disclosing ownership of 74,271 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $81,204,198 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 97,610 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -23.91% 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)
2026-05-14 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 74,271 -23,339 -23.91 81,204 -8.21 0.0683
2026-02-13 2025-12-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 97,610 -10,775 -9.94 88,470 -11.34 0.1379
2025-11-13 2025-09-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 108,385 4,052 3.88 99,784 30.77 0.1605
2025-08-13 2025-06-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 104,333 -4,199 -3.87 76,307 21.23 0.1338
2025-05-15 2025-03-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 108,532 -54,373 -33.38 62,946 -34.70 0.1212
2025-02-14 2024-12-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 162,905 17,661 12.16 96,391 -28.22 0.1843
2024-11-14 2024-09-30 13F MONOLITHIC POWER SYS COMMON 609839105 145,244 -10,728 -6.88 134,279 4.77 0.2608
2024-08-14 2024-06-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 155,972 -4,156 -2.60 128,160 18.15 0.2659
2024-05-14 2024-03-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 160,128 2,680 1.70 108,474 9.22 0.2275
2024-02-14 2023-12-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 157,448 -701 -0.44 99,315 35.93 0.2263
2023-11-13 2023-09-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 158,149 7,568 5.03 73,065 -10.18 0.1993
2023-08-11 2023-06-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 150,581 28,517 23.36 81,348 33.14 0.2147
2023-05-15 2023-03-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 122,064 -36,160 -22.85 61,098 110,987.27 0.1507
2023-02-13 2022-12-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 158,224 -1,348 -0.84 56 -99.91 0.1473
2022-11-15 2022-09-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 159,572 2,911 1.86 57,989 -3.62 0.1709
2022-08-08 2022-06-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 156,661 -77,674 -33.15 60,164 -47.14 0.1670
2022-05-13 2022-03-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 234,335 5,422 2.37 113,811 0.78 0.2812
2022-02-09 2021-12-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 228,913 -8,218 -3.47 112,930 -1.74 0.2640
2021-11-12 2021-09-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 237,131 -1,179 -0.49 114,933 29.14 0.2940
2021-08-11 2021-06-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 238,310 -73,345 -23.53 88,997 -19.15 0.2313
2021-05-13 2021-03-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 311,655 -19,210 -5.81 110,080 -9.15 0.3087
2021-02-11 2020-12-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 330,865 -5,178 -1.54 121,173 28.96 0.3622
2020-11-12 2020-09-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 336,043 -13,659 -3.91 93,961 13.37 0.3219
2020-10-22 2020-06-30 13F/A-1 MONOLITHIC PWR SYS INC COM COMMON 609839105 349,702 -15,115 -4.14 82,879 35.66 0.3122
2020-08-14 2020-06-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 439,925 75,108 78,315 155,202.5371
2020-05-14 2020-03-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 364,817 -77,871 -17.59 61,092 -22.48 0.2790
2020-02-14 2019-12-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 442,688 -38,064 -7.92 78,807 5.33 0.2829
2019-11-14 2019-09-30 13F MONOLITHIC POWER SYSTEMS Common 609839105 480,752 -3,848 -0.79 74,820 13.71 0.2947
2019-08-14 2019-06-30 13F MONOLITHIC POWER SYSTEMS COMMON 609839105 484,600 83,973 20.96 65,799 21.22 0.2558
2019-05-14 2019-03-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 400,627 14,319 3.71 54,281 20.87 0.3174
2019-02-14 2018-12-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 386,308 11,403 3.04 44,908 -3.73 0.3048
2018-11-13 2018-09-30 13F Monolithic Power Systems COMMON 609839105 374,905 3,153 0.85 46,649 -6.12 0.2923
2018-08-13 2018-06-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 371,752 -4,817 -1.28 49,692 13.99 0.3373
2018-05-14 2018-03-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 376,569 -10,519 -2.72 43,595 0.23 0.3070
2018-02-09 2017-12-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 387,088 -4,920 -1.26 43,493 4.13 0.3081
2017-11-14 2017-09-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 392,008 -11,525 -2.86 41,768 7.37 0.3150
2017-08-14 2017-06-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 403,533 -12,329 -2.96 38,901 1.57 0.3048
2017-06-19 2017-03-31 13F/A-1 MONOLITHIC PWR SYS INC COM COMMON 609839105 415,862 -6,573 -1.56 38,301 10.66 0.3098
2017-05-09 2017-03-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 415,862 38,301
2017-02-10 2016-12-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 422,435 -27,008 -6.01 34,610 -4.34 0.3005
2016-11-10 2016-09-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 449,443 -3,678 -0.81 36,180 16.87 0.3241
2016-08-11 2016-06-30 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 453,121 200,742 79.54 30,957 92.75 0.2839
2016-05-12 2016-03-31 13F MONOLITHIC PWR SYS INC COM COMMON 609839105 252,379 252,379 16,061 0.1537
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.