Monolithic Power Systems, Inc.
US ˙ NasdaqGS ˙ US6098391054

SecurityMPWR / Monolithic Power Systems, Inc.
InstitutionMacquarie Group Ltd
Latest Disclosed Ownership10,489 shares
Latest Disclosed Value $ 11,468,148
Macquarie Group Ltd reports 64.51% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On May 15, 2026 - Macquarie Group Ltd filed a 13F-HR form disclosing ownership of 10,489 shares of Monolithic Power Systems, Inc. (US:MPWR) valued at $11,468,148 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 29,556 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -64.51% during the quarter. The current value of the position is $17,725,256 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)
2026-05-15 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 10,489 -19,067 -64.51 11,468 -57.19 0.0534
2026-02-13 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 29,556 -151,239 -83.65 26,788 -83.91 0.1171
2025-11-13 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 180,795 -13,699 -7.04 166,448 17.01 0.1943
2025-08-14 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 194,494 -30,381 -13.51 142,249 9.07 0.1745
2025-08-14 2025-03-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 224,875 -38,164 -14.51 130,423 -15.76 0.1619
2025-05-15 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 227,657 -35,382 128,813 0.1052
2025-02-14 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 263,039 -8,906 -3.27 154,817 -38.42 0.1878
2024-11-14 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 271,945 -90,236 -24.91 251,413 -15.52 0.2714
2024-08-09 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 362,181 -84,216 -18.87 297,597 -1.59 0.3413
2024-05-14 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 446,397 -7,740 -1.70 302,398 5.56 0.3430
2024-02-14 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 454,137 -17,366 -3.68 286,461 31.50 0.3309
2023-11-14 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 471,503 -107,056 -18.50 217,835 -30.31 0.2736
2023-10-27 2023-06-30 13F/A-2 MONOLITHIC PWR SYS COM 609839105 578,559 -55,941 -8.82 312,555 -1.59 0.3574
2023-10-12 2023-06-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 578,559 -55,941 312,555 0.3142
2023-08-14 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 578,559 -55,941 312,555 0.3171
2023-06-01 2023-03-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 634,500 -11,138 -1.73 317,592 39.11 0.3773
2023-05-15 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 634,500 -11,138 317,592 0.2915
2023-02-21 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 645,638 -10,877 -1.66 228,304 -4.31 0.2696
2022-11-14 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 656,515 -130,310 -16.56 238,577 -21.05 0.2926
2022-08-17 2022-06-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 786,825 -84,100 -9.66 302,172 -28.56 0.3393
2022-08-15 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 786,825 -84,100 302,172 0.1082
2022-05-16 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 870,925 -124,670 -12.52 422,991 -13.88 0.3217
2022-02-11 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 995,595 -55,754 -5.30 491,156 -3.61 0.4092
2021-11-12 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 1,051,349 -100,358 -8.71 509,568 18.48 0.4343
2021-08-13 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 1,151,707 900,527 358.52 430,105 384.79 0.3532
2021-05-14 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 251,180 61,267 32.26 88,719 27.56 0.1254
2021-02-16 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 189,913 -11,454 -5.69 69,552 23.53 0.1016
2020-11-13 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 201,367 -238 -0.12 56,304 17.84 0.0953
2020-08-11 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 201,605 -2,567 -1.26 47,780 39.75 0.0823
2020-05-15 2020-03-31 13F MONOLITHIC PWR SYS COM 609839105 204,172 -34,725 -14.54 34,190 -19.61 0.0702
2020-03-18 2019-12-31 13F/A-2 MONOLITHIC PWR SYS COM 609839105 238,897 -3,977 -1.64 42,529 12.51 0.0607
2020-02-28 2019-12-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 238,897 0 42,529 0.0614
2020-02-14 2019-12-31 13F MONOLITHIC PWR SYS COM 609839105 238,897 -3,977 42,529 53,370.2908
2019-11-14 2019-09-30 13F MONOLITHIC PWR SYS COM 609839105 242,874 -26 -0.01 37,799 14.61 0.0634
2019-11-06 2019-06-30 13F/A-2 MONOLITHIC PWR SYS COM 609839105 242,900 -9,525 -3.77 32,981 -3.57 0.0556
2019-09-24 2019-06-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 242,900 0 32,981 0.0561
2019-08-14 2019-06-30 13F MONOLITHIC PWR SYS COM 609839105 242,900 -9,525 32,981
2019-05-15 2019-03-31 13F MONOLITHIC PWR SYS COM 609839105 252,425 24,369 10.69 34,201 29.00 0.0583
2019-02-15 2018-12-31 13F MONOLITHIC PWR SYS COM 609839105 228,056 -3,214 -1.39 26,512 -8.68 0.0512
2018-11-15 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 231,270 9,035 4.07 29,031 -2.27 0.0473
2019-03-21 2018-06-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 222,235 30,935 16.17 29,706 34.13 0.0512
2018-08-14 2018-06-30 13F MONOLITHIC PWR SYS COM 609839105 222,235 30,935 29,706
2018-05-11 2018-03-31 13F MONOLITHIC PWR SYS COM 609839105 191,300 54,000 39.33 22,147 43.56 0.0404
2018-02-14 2017-12-31 13F MONOLITHIC PWR SYS COM 609839105 137,300 19,550 16.60 15,427 22.96 0.0273
2017-11-08 2017-09-30 13F MONOLITHIC PWR SYS COM 609839105 117,750 117,750 12,546 0.0225
2016-08-15 2016-06-30 13F MONOLITHIC POWER SYSTEMS COMMON 609839105 0 -40,072 -100.00 0 -100.00
2016-05-16 2016-03-31 13F MONOLITHIC POWER SYSTEMS COMMON 609839105 40,072 -2,442 -5.74 2,550 -5.87 0.0051
2016-02-16 2015-12-31 13F MONOLITHIC POWER SYSTEMS COMMON 609839105 42,514 8,061 23.40 2,709 53.57 0.0056
2015-11-16 2015-09-30 13F MONOLITHIC POWER SYSTEMS COMMON 609839105 34,453 34,453 1,764 0.0038
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.