Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionSummit Trail Advisors, Llc
Latest Disclosed Ownership4,325 shares
Latest Disclosed Value $ 4,728,739
Summit Trail Advisors, Llc reports 12.81% increase in ownership of MPWR / Monolithic Power Systems, Inc.

On May 12, 2026 - Summit Trail Advisors, Llc filed a 13F-HR form disclosing ownership of 4,325 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $4,728,739 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 3,834 shares of Monolithic Power Systems, Inc.. This represents a change in shares of 12.81% 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)
2026-05-12 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 4,325 491 12.81 4,729 35.86 0.0677
2026-02-17 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 3,834 107 2.87 3,481 1.28 0.0602
2025-11-14 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 3,727 723 24.07 3,437 56.04 0.0475
2025-08-14 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 3,004 3,004 2,202 0.0378
2025-01-29 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 0 -291 -100.00 0 -100.00
2024-11-12 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 291 291 269 0.0067
2018-08-10 2018-06-30 13F MONOLITHIC PWR SYS INC COM EQUITY 609839105 0 -98,226 -100.00 0 -100.00
2018-05-21 2018-03-31 13F MONOLITHIC PWR SYS INC COM EQUITY 609839105 98,226 96,836 6,966.62 98 -39.51 0.0153
2018-02-14 2017-12-31 13F MONOLITHIC PWR SYS INC COM EQUITY 609839105 1,390 1,390 162 0.0205
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.