Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionGeode Capital Management, Llc
Latest Disclosed Ownership1,432,066 shares
Latest Disclosed Value $ 1,560,540,423
Geode Capital Management, Llc reports 3.60% increase in ownership of MPWR / Monolithic Power Systems, Inc.

On May 15, 2026 - Geode Capital Management, Llc filed a 13F-HR form disclosing ownership of 1,432,066 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $1,560,540,423 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 1,382,280 shares of Monolithic Power Systems, Inc.. This represents a change in shares of 3.60% 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)
2026-05-15 2026-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 1,432,066 49,786 3.60 1,560,540 25.00 0.0519
2026-02-09 2025-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 1,382,280 44,583 3.33 1,248,436 1.76 0.0770
2025-11-12 2025-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 1,337,697 19,156 1.45 1,226,829 27.52 0.0783
2025-08-08 2025-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 1,318,541 -87,495 -6.22 962,039 18.13 0.0674
2025-05-13 2025-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 1,406,036 40,577 2.97 814,384 0.90 0.0640
2025-02-12 2024-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 1,365,459 31,295 2.35 807,158 -34.41 0.0625
2024-11-12 2024-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 1,334,164 133,838 11.15 1,230,626 25.09 0.0996
2024-08-09 2024-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 1,200,326 52,451 4.57 983,755 26.83 0.0863
2024-05-13 2024-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 1,147,875 51,365 4.68 775,642 12.42 0.0717
2024-02-13 2023-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 1,096,510 33,185 3.12 689,924 40.73 0.0722
2023-11-13 2023-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 1,063,325 65,252 6.54 490,249 -8.85 0.0584
2023-08-11 2023-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 998,073 31,774 3.29 537,840 11.44 0.0632
2023-05-15 2023-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 966,299 13,218 1.39 482,618 143,536.31 0.0627
2023-02-13 2022-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 953,081 26,320 2.84 336 -99.90 0.0472
2022-11-14 2022-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 926,761 33,947 3.80 336,412 -1.71 0.0510
2022-08-12 2022-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 892,814 8,452 0.96 342,279 -20.13 0.0501
2022-05-13 2022-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 884,362 29,567 3.46 428,550 1.87 0.0535
2022-02-11 2021-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 854,795 25,061 3.02 420,694 4.86 0.0507
2021-11-12 2021-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 829,734 23,443 2.91 401,204 33.59 0.0540
2021-08-13 2021-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 806,291 1,263 0.16 300,318 5.88 0.0414
2021-05-12 2021-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 805,028 242,275 43.05 283,651 37.78 0.0434
2021-02-12 2020-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 562,753 42,630 8.20 205,868 41.56 0.0346
2020-11-13 2020-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 520,123 -16,875 -3.14 145,431 14.27 0.0285
2020-08-13 2020-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 536,998 19,035 3.67 127,267 46.73 0.0272
2020-05-14 2020-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 517,963 11,139 2.20 86,737 -3.86 0.0226
2020-02-20 2019-12-31 13F/A-1 MONOLITHIC POWER SYSTEMS COM 609839105 506,824 19,408 3.98 90,224 18.94 0.0189
2020-02-13 2019-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 506,824 19,408 90,224 11,498.2577
2019-11-12 2019-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 487,416 20,560 4.40 75,856 19.67 0.0177
2019-08-14 2019-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 466,856 13,939 3.08 63,389 3.30 0.0153
2019-05-14 2019-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 452,917 20,703 4.79 61,365 22.13 0.0159
2019-03-06 2018-12-31 13F/A-1 MONOLITHIC POWER SYSTEMS COM 609839105 432,214 28,955 7.18 50,244 -0.74 0.0155
2019-02-13 2018-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 432,214 28,955 50,244
2018-11-13 2018-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 403,259 12,277 3.14 50,620 -3.14 0.0143
2018-08-14 2018-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 390,982 36,646 10.34 52,262 27.40 0.0161
2018-05-15 2018-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 354,336 4,956 1.42 41,021 4.50 0.0134
2018-02-13 2017-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 349,380 38 0.01 39,256 5.46 0.0133
2017-11-14 2017-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 349,342 13,815 4.12 37,222 15.08 0.0137
2017-08-14 2017-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 335,527 15,777 4.93 32,344 9.83 0.0127
2017-06-21 2017-03-31 13F/A-1 MONOLITHIC POWER SYSTEMS COM 609839105 319,750 28,155 9.66 29,448 23.26 0.0121
2017-05-12 2017-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 319,750 29,448
2017-02-14 2016-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 291,595 24,503 9.17 23,890 11.12 0.0111
2016-11-10 2016-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 267,092 2,134 0.81 21,500 18.78 0.0108
2016-08-12 2016-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 264,958 9,907 3.88 18,101 11.52 0.0098
2016-05-13 2016-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 255,051 16,840 7.07 16,231 6.95 0.0086
2016-02-12 2015-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 238,211 3,410 1.45 15,176 26.25 0.0086
2015-11-13 2015-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 234,801 3,437 1.49 12,021 2.46 0.0073
2015-08-14 2015-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 231,364 14,573 6.72 11,732 2.79 0.0067
2015-05-14 2015-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 216,791 7,980 3.82 11,414 9.90 0.0065
2015-02-12 2014-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 208,811 14,039 7.21 10,386 21.06 0.0062
2014-11-14 2014-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 194,772 2,235 1.16 8,579 5.23 0.0056
2014-08-13 2014-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 192,537 2,447 1.29 8,153 10.64 0.0053
2014-05-14 2014-03-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 190,090 16,746 9.66 7,369 22.65 0.0049
2014-02-14 2013-12-31 13F MONOLITHIC POWER SYSTEMS COM 609839105 173,344 9,242 5.63 6,008 20.91 0.0042
2013-11-14 2013-09-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 164,102 20,266 14.09 4,969 43.28 0.0040
2013-08-14 2013-06-30 13F MONOLITHIC POWER SYSTEMS COM 609839105 143,836 143,836 3,468 0.0030
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.