Monolithic Power Systems, Inc.
US ˙ NasdaqGS ˙ US6098391054

SecurityMPWR / Monolithic Power Systems, Inc.
InstitutionColdstream Capital Management Inc
Latest Disclosed Ownership3,342 shares
Latest Disclosed Value $ 3,653,218
Coldstream Capital Management Inc reports 31.33% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On May 8, 2026 - Coldstream Capital Management Inc filed a 13F-HR form disclosing ownership of 3,342 shares of Monolithic Power Systems, Inc. (US:MPWR) valued at $3,653,976 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 4,867 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -31.33% during the quarter. The current value of the position is $5,647,612 USD.

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)
2026-05-08 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 3,342 -1,525 -31.33 3,653 -17.18 0.0392
2026-02-09 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 4,867 -288 -5.59 4,412 -7.06 0.0569
2025-11-19 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 5,155 -2 -0.04 4,746 25.86 0.0639
2025-08-12 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 5,157 276 5.65 3,772 33.25 0.0617
2025-05-13 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 4,881 928 23.48 2,831 20.99 0.0603
2025-02-14 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 3,953 178 4.72 2,339 -32.46 0.0499
2024-11-18 2024-09-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 3,775 -460 -10.86 3,464 -0.46 0.0748
2024-11-18 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 3,775 3,464
2024-08-07 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 4,235 161 3.95 3,480 26.10 0.0848
2024-05-14 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 4,074 -772 -15.93 2,760 -9.72 0.0701
2024-02-09 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 4,846 265 5.78 3,057 44.42 0.0855
2023-11-02 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 4,581 47 1.04 2,116 -13.60 0.0691
2023-08-03 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 4,534 -26 -0.57 2,449 7.32 0.0776
2023-05-15 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 4,560 78 1.74 2,282 43.97 0.0766
2023-01-10 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 4,482 -244 -5.16 1,585 -12.67 0.0580
2022-08-08 2022-06-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 4,726 390 8.99 1,815 -13.82 0.0707
2022-08-08 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 4,083 -253 1,568 0.0667
2022-05-11 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 4,336 -2,322 -34.88 2,106 -35.89 0.0726
2022-02-11 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 6,658 5,374 418.54 3,285 815.04 0.1031
2021-11-12 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 1,284 -8,301 -86.60 359 -89.97 0.0174
2021-08-16 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 9,585 5,494 134.29 3,580 147.75 0.1441
2021-06-16 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 4,091 -290 -6.62 1,445 -9.91 0.0846
2021-02-16 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 4,381 3,122 247.97 1,604 355.68 0.0968
2020-11-16 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 1,259 0 0.00 352 18.12 0.0293
2020-08-12 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 1,259 -64 -4.84 298 34.23 0.0268
2020-05-27 2020-03-31 13F MONOLITHIC PWR SYS COM 609839105 1,323 -157 -10.61 222 -15.91 0.0243
2020-02-13 2019-12-31 13F MONOLITHIC PWR SYS COM 609839105 1,480 -49 -3.20 264 10.92 0.0216
2019-11-15 2019-09-30 13F MONOLITHIC PWR SYS COM 609839105 1,529 0 0.00 238 14.98 0.0200
2019-08-15 2019-06-30 13F MONOLITHIC PWR SYS COM 609839105 1,529 -3 -0.20 207 -0.48 0.0172
2019-05-10 2019-03-31 13F MONOLITHIC PWR SYS COM 609839105 1,532 1,532 208 0.0182
2018-11-14 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 0 -1,504 -100.00 0 -100.00
2018-08-14 2018-06-30 13F MONOLITHIC PWR SYS COM 609839105 1,504 1,504 201 0.0203
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.