Monolithic Power Systems, Inc.
US ˙ NasdaqGS ˙ US6098391054

SecurityMPWR / Monolithic Power Systems, Inc.
InstitutionJennison Associates Llc
Latest Disclosed Ownership49,394 shares
Latest Disclosed Value $ 54,004,536
Jennison Associates Llc reports 20.11% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

On May 6, 2026 - Jennison Associates Llc filed a 13F-HR form disclosing ownership of 49,394 shares of Monolithic Power Systems, Inc. (US:MPWR) valued at $54,004,930 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 61,828 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -20.11% during the quarter. The current value of the position is $73,154,984 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)
2026-05-06 2026-03-31 13F MONOLITHIC PWR SYS COM 609839105 49,394 -12,434 -20.11 54,005 -3.63 0.0199
2026-01-30 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 61,828 7,873 14.59 56,038 12.81 0.0336
2025-10-30 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 53,955 3,271 6.45 49,673 34.00 0.0289
2025-08-01 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 50,684 9,045 21.72 37,069 53.50 0.0220
2025-05-05 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 41,639 3,628 9.54 24,150 7.37 0.0169
2025-01-24 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 38,011 -63,907 -62.70 22,491 -76.13 0.0137
2024-11-08 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 101,918 101,211 14,315.56 94,223 16,145.34 0.0585
2024-08-05 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 707 0 0.00 581 21.34 0.0004
2024-05-02 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 707 187 35.96 479 45.73 0.0003
2024-02-01 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 520 -485 -48.26 328 -29.31 0.0002
2023-10-31 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 1,005 -34,892 -97.20 464 -97.61 0.0004
2023-08-03 2023-06-30 13F MONOLITHIC PWR SYS COM 609839105 35,897 18,752 109.37 19,393 125.99 0.0159
2023-04-26 2023-03-31 13F MONOLITHIC PWR SYS COM 609839105 17,145 17,145 8,582 0.0079
2023-02-09 2022-12-31 13F MONOLITHIC PWR SYS COM 609839105 0 -32,624 -100.00 0 -100.00
2022-11-01 2022-09-30 13F MONOLITHIC PWR SYS COM 609839105 32,624 -11,413 -25.92 11,856 -29.90 0.0118
2022-08-02 2022-06-30 13F MONOLITHIC PWR SYS COM 609839105 44,037 -33,680 -43.34 16,912 -55.20 0.0169
2022-05-11 2022-03-31 13F MONOLITHIC PWR SYS COM 609839105 77,717 21,610 38.52 37,746 36.37 0.0278
2022-02-08 2021-12-31 13F MONOLITHIC PWR SYS COM 609839105 56,107 -13,595 -19.50 27,679 -18.07 0.0176
2021-11-09 2021-09-30 13F MONOLITHIC PWR SYS COM 609839105 69,702 -20,556 -22.77 33,783 0.23 0.0218
2021-08-12 2021-06-30 13F MONOLITHIC PWR SYS COM 609839105 90,258 -12,348 -12.03 33,707 -6.99 0.0223
2021-05-11 2021-03-31 13F MONOLITHIC PWR SYS COM 609839105 102,606 -63,581 -38.26 36,241 -40.45 0.0265
2021-02-05 2020-12-31 13F MONOLITHIC PWR SYS COM 609839105 166,187 -51,299 -23.59 60,863 0.09 0.0434
2020-11-04 2020-09-30 13F MONOLITHIC PWR SYS COM 609839105 217,486 12,460 6.08 60,811 25.15 0.0489
2020-08-06 2020-06-30 13F MONOLITHIC PWR SYS COM 609839105 205,026 -31,552 -13.34 48,591 22.65 0.0439
2020-05-06 2020-03-31 13F MONOLITHIC PWR SYS COM 609839105 236,578 -10,579 -4.28 39,617 -9.96 0.0481
2020-02-07 2019-12-31 13F MONOLITHIC PWR SYS COM 609839105 247,157 -19,946 -7.47 43,999 5.85 0.0444
2019-11-08 2019-09-30 13F MONOLITHIC PWR SYS COM 609839105 267,103 -5,322 -1.95 41,569 12.38 0.0439
2019-08-06 2019-06-30 13F MONOLITHIC PWR SYS COM 609839105 272,425 10,132 3.86 36,990 4.09 0.0370
2019-05-10 2019-03-31 13F MONOLITHIC PWR SYS COM 609839105 262,293 -1,532 -0.58 35,538 15.87 0.0353
2019-02-06 2018-12-31 13F MONOLITHIC PWR SYS COM 609839105 263,825 349 0.13 30,670 -7.27 0.0343
2018-11-08 2018-09-30 13F MONOLITHIC PWR SYS COM 609839105 263,476 140,649 114.51 33,074 101.45 0.0305
2018-08-02 2018-06-30 13F MONOLITHIC PWR SYS COM 609839105 122,827 -6,877 -5.30 16,418 9.34 0.0160
2018-04-20 2018-03-31 13F MONOLITHIC PWR SYS COM 609839105 129,704 -10,347 -7.39 15,016 -4.58 0.0149
2018-01-25 2017-12-31 13F MONOLITHIC PWR SYS COM 609839105 140,051 -653 -0.46 15,736 4.96 0.0155
2017-11-03 2017-09-30 13F MONOLITHIC PWR SYS COM 609839105 140,704 -15,246 -9.78 14,992 -0.28 0.0154
2017-08-04 2017-06-30 13F MONOLITHIC PWR SYS COM 609839105 155,950 -2,892 -1.82 15,034 2.77 0.0159
2017-08-02 2017-03-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 158,842 -30,767 -16.23 14,629 -5.83 0.0157
2017-04-28 2017-03-31 13F MONOLITHIC PWR SYS COM 609839105 158,842 -30,767 14,629
2017-08-02 2016-12-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 189,609 -164,985 -46.53 15,535 -45.58 0.0173
2017-02-06 2016-12-31 13F MONOLITHIC PWR SYS COM 609839105 189,609 -164,985 15,535
2016-11-01 2016-09-30 13F MONOLITHIC PWR SYS COM 609839105 354,594 -97,127 -21.50 28,545 -7.51 0.0308
2016-08-03 2016-06-30 13F MONOLITHIC PWR SYS COM 609839105 451,721 -63,891 -12.39 30,862 -5.95 0.0339
2016-05-03 2016-03-31 13F MONOLITHIC PWR SYS COM 609839105 515,612 21,909 4.44 32,814 4.32 0.0344
2016-02-10 2015-12-31 13F MONOLITHIC PWR SYS COM 609839105 493,703 47,565 10.66 31,454 37.70 0.0309
2015-11-06 2015-09-30 13F MONOLITHIC PWR SYS COM 609839105 446,138 -46,688 -9.47 22,842 -8.60 0.0243
2015-08-03 2015-06-30 13F MONOLITHIC PWR SYS COM 609839105 492,826 7,545 1.55 24,991 -2.19 0.0229
2015-06-25 2015-03-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 485,281 1,562 0.32 25,550 6.19 0.0234
2015-05-04 2015-03-31 13F MONOLITHIC PWR SYS COM 609839105 485,281 25,550
2015-06-25 2014-12-31 13F/A-1 MONOLITHIC PWR SYS COM 609839105 483,719 134,836 38.65 24,060 56.56 0.0225
2015-02-06 2014-12-31 13F MONOLITHIC PWR SYS COM 609839105 483,719 134,836 24,060 0.0225
2014-11-12 2014-09-30 13F/A-1 MONOLITHIC PWR SYS COM 609839105 348,883 348,883 15,368 0.0143
2014-11-05 2014-09-30 13F MONOLITHIC PWR SYS COM 609839105 348,883 348,883 15,368 0.0146
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.