Monolithic Power Systems, Inc.
US ˙ NasdaqGS ˙ US6098391054

SecurityMPWR / Monolithic Power Systems, Inc.
InstitutionGuggenheim Capital Llc
Latest Disclosed Ownership14,080 shares
Latest Disclosed Value $ 15,394,368
Guggenheim Capital Llc reports 13.24% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On May 15, 2026 - Guggenheim Capital Llc filed a 13F-HR form disclosing ownership of 14,080 shares of Monolithic Power Systems, Inc. (US:MPWR) valued at $15,394,368 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 16,228 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -13.24% during the quarter. The current value of the position is $20,853,184 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 14,080 -2,148 -13.24 15,394 4.66 0.0595
2026-02-17 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 16,228 12,846 379.83 14,708 372.47 0.1053
2025-11-13 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 3,382 78 2.36 3,114 28.85 0.0226
2025-08-13 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 3,304 -413 -11.11 2,416 12.11 0.0192
2025-05-14 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 3,717 -963 -20.58 2,156 -22.17 0.0198
2025-02-13 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 4,680 -5,082 -52.06 2,769 -69.32 0.0224
2024-11-13 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 9,762 2,154 28.31 9,025 44.36 0.0632
2024-08-14 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 7,608 658 9.47 6,251 32.77 0.0443
2024-05-14 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 6,950 111 1.62 4,708 9.16 0.0332
2024-02-14 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 6,839 -163 -2.33 4,314 33.36 0.0326
2023-11-14 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 7,002 -830 -10.60 3,235 -23.56 0.0278
2023-08-11 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 7,832 1,109 16.50 4,231 25.74 0.0332
2023-05-11 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 6,723 1,350 25.13 3,365 77.20 0.0283
2023-02-14 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 5,373 -1,510 -21.94 1,900 -24.10 0.0167
2022-11-14 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 6,883 -2,083 -23.23 2,502 -27.33 0.0229
2022-08-15 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 8,966 -3,913 -30.38 3,443 -44.96 0.0272
2022-05-16 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 12,879 -5,238 -28.91 6,255 -30.01 0.0376
2022-02-14 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 18,117 6,058 50.24 8,937 52.90 0.0466
2021-11-15 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 12,059 -1,347 -10.05 5,845 16.76 0.0351
2021-08-13 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 13,406 877 7.00 5,006 13.13 0.0295
2021-05-13 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 12,529 1,336 11.94 4,425 7.95 0.0290
2021-02-16 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 11,193 1,456 14.95 4,099 50.53 0.0257
2020-11-13 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 9,737 -532 -5.18 2,723 11.87 0.0197
2020-08-14 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 10,269 1,780 20.97 2,434 71.17 0.0188
2020-06-02 2020-03-31 13F MONOLITHIC PWR SYS COM 609839105 8,489 -2,968 -25.91 1,422 -30.29 0.0143
2020-02-20 2019-12-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 11,457 3,217 39.04 2,040 59.13 0.0153
2020-02-14 2019-12-31 13F MONOLITHIC PWR SYS COM 609839105 11,457 3,217 2,040 12,090.6722
2020-02-20 2019-09-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 8,240 3,742 83.19 1,282 109.82 0.0102
2019-11-14 2019-09-30 13F MONOLITHIC PWR SYS COM 609839105 8,240 3,742 1,282 9,394.8720
2019-08-14 2019-06-30 13F MONOLITHIC PWR SYS COM 609839105 4,498 -1,333 -22.86 611 -22.66 0.0050
2019-05-15 2019-03-31 13F MONOLITHIC PWR SYS COM 609839105 5,831 1,545 36.05 790 58.63 0.0064
2019-02-14 2018-12-31 13F MONOLITHIC PWR SYS COM 609839105 4,286 -12,542 -74.53 498 -76.42 0.0042
2018-11-14 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 16,828 -3,490 -17.18 2,112 -22.18 0.0138
2018-08-14 2018-06-30 13F MONOLITHIC PWR SYS COM 609839105 20,318 -68,941 -77.24 2,714 -73.73 0.0181
2018-05-15 2018-03-31 13F MONOLITHIC PWR SYS COM 609839105 89,259 430 0.48 10,333 3.54 0.0252
2018-02-14 2017-12-31 13F MONOLITHIC PWR SYS COM 609839105 88,829 -18,778 -17.45 9,980 -12.96 0.0236
2017-11-14 2017-09-30 13F MONOLITHIC PWR SYS COM 609839105 107,607 4,733 4.60 11,466 15.60 0.0269
2017-08-14 2017-06-30 13F MONOLITHIC PWR SYS COM 609839105 102,874 -20,114 -16.35 9,919 -12.42 0.0263
2017-05-15 2017-03-31 13F MONOLITHIC PWR SYS COM 609839105 122,988 -5,430 -4.23 11,326 7.66 0.0307
2017-02-14 2016-12-31 13F MONOLITHIC PWR SYS COM 609839105 128,418 17,877 16.17 10,520 18.22 0.0301
2016-11-14 2016-09-30 13F MONOLITHIC PWR SYS COM 609839105 110,541 54,759 98.17 8,899 133.51 0.0277
2016-08-15 2016-06-30 13F MONOLITHIC PWR SYS COM 609839105 55,782 1,662 3.07 3,811 10.66 0.0120
2016-05-16 2016-03-31 13F MONOLITHIC PWR SYS COM 609839105 54,120 -4,708 -8.00 3,444 -8.14 0.0109
2016-02-16 2015-12-31 13F MONOLITHIC PWR SYS COM 609839105 58,828 -12,096 -17.05 3,749 3.22 0.0109
2015-11-16 2015-09-30 13F MONOLITHIC PWR SYS COM 609839105 70,924 19,098 36.85 3,632 38.20 0.0112
2015-08-14 2015-06-30 13F MONOLITHIC PWR SYS COM 609839105 51,826 16,012 44.71 2,628 39.34 0.0065
2015-05-18 2015-03-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 35,814 5,154 16.81 1,886 23.67 0.0045
2015-05-15 2015-03-31 13F MONOLITHIC PWR SYS COM 609839105 35,814 1,886
2015-02-17 2014-12-31 13F MONOLITHIC PWR SYS COM 609839105 30,660 16,152 111.33 1,525 138.65 0.0038
2014-11-14 2014-09-30 13F MONOLITHIC PWR SYS COM 609839105 14,508 5,980 70.12 639 77.01 0.0015
2014-08-14 2014-06-30 13F MONOLITHIC PWR SYS COM 609839105 8,528 8,528 -73.77 361 -63.31 0.0009
2014-02-14 2013-12-31 13F MONOLITHIC PWR SYS COM 609839105 0 -32,512 -100.00 0 -100.00
2013-11-14 2013-09-30 13F MONOLITHIC PWR SYS COM 609839105 32,512 -2,031 -5.88 984 18.13 0.0035
2013-08-22 2013-06-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 34,543 34,543 833 0.0035
2013-08-14 2013-06-30 13F MONOLITHIC PWR SYS COM 609839105 34,543 833 0.0035
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.