Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionFirst Trust Advisors Lp
Latest Disclosed Ownership591,353 shares
Latest Disclosed Value $ 646,556,012
First Trust Advisors Lp reports 15.70% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On May 13, 2026 - First Trust Advisors Lp filed a 13F-HR form disclosing ownership of 591,353 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $646,556,012 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 701,454 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -15.70% 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 591,353 -110,101 -15.70 646,556 1.70 0.4608
2026-02-13 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 701,454 253,653 56.64 635,770 54.21 0.4621
2025-11-12 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 447,801 178,622 66.36 412,263 109.41 0.3064
2025-08-13 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 269,179 85,777 46.77 196,872 85.08 0.1583
2025-05-14 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 183,402 106,308 137.89 106,369 133.18 0.0942
2025-02-13 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 77,094 -9,392 -10.86 45,616 -42.95 0.0402
2024-11-13 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 86,486 6,881 8.64 79,956 22.24 0.0762
2024-08-13 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 79,605 -18,486 -18.85 65,410 -1.56 0.0667
2024-05-13 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 98,091 65,173 197.99 66,449 220.02 0.0674
2024-02-13 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 32,918 -55,201 -62.64 20,764 -49.00 0.0227
2023-11-13 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 88,119 -4,508 -4.87 40,711 -18.64 0.0482
2023-08-14 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 92,627 56,485 156.29 50,040 176.61 0.0569
2023-05-15 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 36,142 9,618 36.26 18,090 92.88 0.0209
2023-02-09 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 26,524 -35,561 -57.28 9,379 -58.43 0.0112
2022-11-14 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 62,085 -13,734 -18.11 22,561 -22.52 0.0293
2022-08-12 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 75,819 5,142 7.28 29,117 -15.18 0.0360
2022-05-13 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 70,677 -39,953 -36.11 34,326 -37.11 0.0351
2022-02-08 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 110,630 64,614 140.42 54,577 144.71 0.0531
2021-11-15 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 46,016 -59,080 -56.22 22,303 -43.17 0.0240
2021-10-12 2021-06-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 105,096 -33,524 -24.18 39,248 -19.84 0.0425
2021-08-16 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 105,096 -33,524 39,248 0.0405
2021-05-14 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 138,620 -16,272 -10.51 48,962 -13.69 0.0593
2021-02-02 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 154,892 43,264 38.76 56,726 81.74 0.0752
2020-11-05 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 111,628 -48,048 -30.09 31,212 -17.52 0.0500
2020-07-22 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 159,676 -21,402 -11.82 37,843 24.80 0.0656
2020-05-06 2020-03-31 13F MONOLITHIC PWR SYS COM 609839105 181,078 -48,413 -21.10 30,323 -25.78 0.0687
2020-02-03 2019-12-31 13F MONOLITHIC PWR SYS COM 609839105 229,491 210,539 1,110.91 40,854 1,285.35 0.0698
2019-11-04 2019-09-30 13F MONOLITHIC PWR SYS COM 609839105 18,952 -225,613 -92.25 2,949 -91.12 0.0056
2019-07-30 2019-06-30 13F MONOLITHIC PWR SYS COM 609839105 244,565 37,793 18.28 33,207 18.53 0.0626
2019-06-19 2019-03-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 206,772 127,604 161.18 28,016 204.42 0.0557
2019-05-09 2019-03-31 13F MONOLITHIC PWR SYS COM 609839105 206,772 127,604 28,016
2019-02-07 2018-12-31 13F MONOLITHIC PWR SYS COM 609839105 79,168 -196,544 -71.29 9,203 -73.41 0.0218
2018-10-25 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 275,712 240,965 693.48 34,610 645.10 0.0644
2018-08-02 2018-06-30 13F MONOLITHIC PWR SYS COM 609839105 34,747 3,119 9.86 4,645 26.84 0.0096
2018-04-23 2018-03-31 13F MONOLITHIC PWR SYS COM 609839105 31,628 -3,225 -9.25 3,662 -6.49 0.0084
2018-02-08 2017-12-31 13F MONOLITHIC PWR SYS COM 609839105 34,853 4,567 15.08 3,916 21.35 0.0093
2017-10-24 2017-09-30 13F MONOLITHIC PWR SYS COM 609839105 30,286 -255 -0.83 3,227 9.61 0.0083
2017-08-02 2017-06-30 13F MONOLITHIC PWR SYS COM 609839105 30,541 2,573 9.20 2,944 14.29 0.0079
2017-05-02 2017-03-31 13F MONOLITHIC PWR SYS COM 609839105 27,968 -16,104 -36.54 2,576 -28.66 0.0071
2017-02-06 2016-12-31 13F MONOLITHIC PWR SYS COM 609839105 44,072 6,943 18.70 3,611 20.81 0.0107
2016-11-01 2016-09-30 13F MONOLITHIC PWR SYS COM 609839105 37,129 1,570 4.42 2,989 23.05 0.0089
2016-08-04 2016-06-30 13F MONOLITHIC PWR SYS COM 609839105 35,559 2,616 7.94 2,429 15.89 0.0076
2016-05-10 2016-03-31 13F MONOLITHIC PWR SYS COM 609839105 32,943 -5,907 -15.20 2,096 -15.31 0.0067
2016-05-04 2015-12-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 38,850 19,554 101.34 2,475 150.51 0.0064
2016-02-03 2015-12-31 13F MONOLITHIC PWR SYS COM 609839105 38,850 2,475
2015-11-05 2015-09-30 13F MONOLITHIC PWR SYS COM 609839105 19,296 -15,460 -44.48 988 -43.93 0.0029
2015-08-04 2015-06-30 13F MONOLITHIC PWR SYS COM 609839105 34,756 -7,858 -18.44 1,762 -21.48 0.0046
2015-05-04 2015-03-31 13F MONOLITHIC PWR SYS COM 609839105 42,614 -13,401 -23.92 2,244 -19.45 0.0066
2015-02-13 2014-12-31 13F MONOLITHIC PWR SYS COM 609839105 56,015 -757 -1.33 2,786 11.40 0.0094
2014-11-12 2014-09-30 13F MONOLITHIC PWR SYS COM 609839105 56,772 -1,881 -3.21 2,501 0.68 0.0098
2014-08-11 2014-06-30 13F MONOLITHIC PWR SYS COM 609839105 58,653 33,078 129.34 2,484 150.40 0.0103
2014-05-12 2014-03-31 13F MONOLITHIC PWR SYS COM 609839105 25,575 -9,137 -26.32 992 -17.54 0.0044
2014-08-08 2013-12-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 34,712 34,712 138.55 1,203 242.74 0.0058
2014-02-13 2013-12-31 13F MONOLITHIC PWR SYS COM 609839105 34,712 1,203
2013-11-12 2013-09-30 13F MONOLITHIC PWR SYS COM 609839105 0 -14,551 -100.00 0 -100.00
2013-08-12 2013-06-30 13F MONOLITHIC PWR SYS COM 609839105 14,551 14,551 351 0.0023
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.