Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionSignaturefd, Llc
Latest Disclosed Ownership982 shares
Latest Disclosed Value $ 1,074,079
Signaturefd, Llc reports 6.51% increase in ownership of MPWR / Monolithic Power Systems, Inc.

On April 7, 2026 - Signaturefd, Llc filed a 13F-HR form disclosing ownership of 982 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $1,074,079 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 922 shares of Monolithic Power Systems, Inc.. This represents a change in shares of 6.51% 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)
2026-04-07 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 982 60 6.51 1,074 28.47 0.0165
2026-01-20 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 922 86 10.29 836 8.71 0.0128
2025-10-21 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 836 29 3.59 770 30.34 0.0121
2025-07-16 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 807 138 20.63 590 52.06 0.0101
2025-05-02 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 669 103 18.20 388 15.82 0.0073
2025-02-10 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 566 -152 -21.17 335 -49.47 0.0063
2024-10-21 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 718 60 9.12 663 22.78 0.0126
2024-07-29 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 658 37 5.96 541 28.57 0.0110
2024-05-03 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 621 65 11.69 421 20.00 0.0089
2024-02-01 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 556 16 2.96 351 40.56 0.0081
2023-11-03 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 540 82 17.90 249 0.81 0.0065
2023-08-01 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 458 6 1.33 247 9.29 0.0063
2023-04-28 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 452 -6 -1.31 226 40.37 0.0062
2023-01-30 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 458 -84 -15.50 162 -18.27 0.0047
2022-11-08 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 542 -143 -20.88 197 -25.10 0.0067
2022-08-10 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 685 -33 -4.60 263 -24.64 0.0090
2022-05-02 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 718 159 28.44 349 26.45 0.0105
2022-01-25 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 559 76 15.73 276 17.95 0.0085
2021-10-28 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 483 62 14.73 234 49.04 0.0081
2021-07-26 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 421 -8 -1.86 157 3.29 0.0063
2021-04-30 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 429 116 37.06 152 32.17 0.0067
2021-02-11 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 313 -30 -8.75 115 19.79 0.0054
2020-11-03 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 343 16 4.89 96 24.68 0.0051
2020-07-30 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 327 30 10.10 77 54.00 0.0047
2020-04-23 2020-03-31 13F MONOLITHIC PWR SYS COM 609839105 297 78 35.62 50 28.21 0.0043
2020-02-05 2019-12-31 13F MONOLITHIC PWR SYS COM 609839105 219 -15 -6.41 39 8.33 0.0029
2019-10-16 2019-09-30 13F MONOLITHIC PWR SYS COM 609839105 234 0 0.00 36 12.50 0.0030
2019-07-31 2019-06-30 13F MONOLITHIC PWR SYS COM 609839105 234 -15 -6.02 32 -5.88 0.0028
2019-05-09 2019-03-31 13F MONOLITHIC PWR SYS COM 609839105 249 -11 -4.23 34 13.33 0.0029
2019-02-13 2018-12-31 13F MONOLITHIC PWR SYS COM 609839105 260 128 96.97 30 76.47 0.0028
2018-11-14 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 132 16 13.79 17 6.25 0.0017
2018-08-14 2018-06-30 13F MONOLITHIC PWR SYS COM 609839105 116 0 0.00 16 23.08 0.0018
2018-05-08 2018-03-31 13F MONOLITHIC PWR SYS COM 609839105 116 116 13 0.0015
2016-05-12 2016-03-31 13F MONOLITHIC PWR SYS COM 609839105 0 -11 -100.00 0 -100.00
2016-01-22 2015-12-31 13F MONOLITHIC PWR SYS COM 609839105 11 0 0.00 1 0.00 0.0002
2015-10-23 2015-09-30 13F MONOLITHIC PWR SYS COM 609839105 11 0 0.00 1 0.00 0.0002
2015-07-15 2015-06-30 13F MONOLITHIC PWR SYS COM 609839105 11 0 0.00 1 0.00 0.0002
2015-04-15 2015-03-31 13F MONOLITHIC PWR SYS COM 609839105 11 11 1 0.0002
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.