Monolithic Power Systems, Inc.
MX ˙ BMV ˙ US6098391054
SecurityMX:MPWR / Monolithic Power Systems, Inc.
InstitutionEarnest Partners Llc
Latest Disclosed Ownership1,863,588 shares
Ownership 4.80%
Earnest Partners Llc ownership in MPWR / Monolithic Power Systems, Inc.

2014-11-10 - Earnest Partners Llc has filed an SC 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 1,863,588 shares of Monolithic Power Systems, Inc. (MX:MPWR). This represents 4.8 percent ownership of the company.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2014-11-10 2014-11-10 13G/A 1,863,588 4.80
2014-10-10 2014-10-10 13G/A 1,986,392 5.10
2014-07-10 2014-07-10 13G/A 1,943,283 5.00
2014-02-14 2014-02-14 13G 2,082,594 5.50

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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.

Upgrade to unlock premium data and export to Excel .

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 151,771 -4,872 -3.11 165,939 16.88 0.6842
2026-02-12 2025-12-31 13F MONOLITHIC PWR SYS COM 609839105 156,643 -49,136 -23.88 141,975 -25.06 0.6084
2025-11-14 2025-09-30 13F MONOLITHIC PWR SYS COM 609839105 205,779 2,643 1.30 189,448 27.52 0.8218
2025-08-15 2025-06-30 13F MONOLITHIC PWR SYS COM 609839105 203,136 17 0.01 148,570 26.12 0.6697
2025-05-14 2025-03-31 13F MONOLITHIC PWR SYS COM 609839105 203,119 108 0.05 117,805 -1.93 0.5641
2025-02-14 2024-12-31 13F MONOLITHIC PWR SYS COM 609839105 203,011 -12,480 -5.79 120,122 -39.70 0.5368
2024-11-14 2024-09-30 13F MONOLITHIC PWR SYS COM 609839105 215,491 -10,946 -4.83 199,221 7.07 0.8674
2024-08-14 2024-06-30 13F MONOLITHIC PWR SYS COM 609839105 226,437 -64,439 -22.15 186,059 -5.58 0.8699
2024-05-15 2024-03-31 13F MONOLITHIC PWR SYS COM 609839105 290,876 14,327 5.18 197,045 12.96 0.9022
2024-02-14 2023-12-31 13F MONOLITHIC PWR SYS COM 609839105 276,549 40,152 16.98 174,442 59.72 0.8710
2023-11-14 2023-09-30 13F MONOLITHIC PWR SYS COM 609839105 236,397 16,553 7.53 109,215 -8.04 0.6299
2023-08-07 2023-06-30 13F MONOLITHIC POWER COM 609839105 219,844 14,642 7.14 118,766 15.63 0.6638
2023-05-15 2023-03-31 13F MONOLITHIC POWER COM 609839105 205,202 10,703 5.50 102,712 49.34 0.5940
2023-02-14 2022-12-31 13F MONOLITHIC POWER COM 609839105 194,499 -28,169 -12.65 68,777 -15.01 0.4215
2022-11-14 2022-09-30 13F MONOLITHIC POWER COM 609839105 222,668 -169,379 -43.20 80,918 -46.26 0.5435
2022-08-12 2022-06-30 13F MONOLITHIC POWER COM 609839105 392,047 15,693 4.17 150,562 -17.63 1.0029
2022-05-16 2022-03-31 13F MONOLITHIC POWER COM 609839105 376,354 -6,292 -1.64 182,788 -3.17 1.0826
2022-02-07 2021-12-31 13F MONOLITHIC POWER COM 609839105 382,646 -16,577 -4.15 188,771 -2.44 1.0889
2021-11-15 2021-09-30 13F MONOLITHIC POWER COM 609839105 399,223 -149,018 -27.18 193,495 -5.49 1.1826
2021-08-16 2021-06-30 13F MONOLITHIC POWER COM 609839105 548,241 13,264 2.48 204,741 8.35 1.2030
2021-05-17 2021-03-31 13F MONOLITHIC POWER COM 609839105 534,977 50,764 10.48 188,959 6.56 1.1288
2021-02-16 2020-12-31 13F MONOLITHIC POWER COM 609839105 484,213 -291,461 -37.58 177,333 -18.24 1.2251
2020-11-16 2020-09-30 13F MONOLITHIC POWER COM 609839105 775,674 -13,644 -1.73 216,886 15.94 1.8710
2020-08-13 2020-06-30 13F MONOLITHIC POWER COM 609839105 789,318 -144,669 -15.49 187,068 19.60 1.7674
2020-05-14 2020-03-31 13F MONOLITHIC POWER COM 609839105 933,987 25,738 2.83 156,405 -3.27 1.7624
2020-02-07 2019-12-31 13F MONOLITHIC POWER COM 609839105 908,249 89,093 10.88 161,686 26.83 1.2708
2019-11-14 2019-09-30 13F MONOLITHIC POWER COM 609839105 819,156 8,590 1.06 127,485 15.83 1.1519
2019-08-13 2019-06-30 13F MONOLITHIC POWER COM 609839105 810,566 -9,241 -1.13 110,059 -0.92 0.9944
2019-05-15 2019-03-31 13F MONOLITHIC POWER COM 609839105 819,807 12,308 1.52 111,076 18.33 1.0611
2019-02-14 2018-12-31 13F MONOLITHIC POWER COM 609839105 807,499 -12,872 -1.57 93,872 -8.85 1.0222
2018-11-14 2018-09-30 13F MONOLITHIC POWER COM 609839105 820,371 -920 -0.11 102,981 -6.20 0.9225
2018-08-13 2018-06-30 13F MONOLITHIC POWER COM 609839105 821,291 1,587 0.19 109,782 15.69 1.0269
2018-05-15 2018-03-31 13F MONOLITHIC POWER COM 609839105 819,704 14,090 1.75 94,897 4.84 0.8975
2018-02-14 2017-12-31 13F MONOLITHIC POWER COM 609839105 805,614 -182,765 -18.49 90,519 -14.05 0.8667
2017-11-14 2017-09-30 13F MONOLITHIC POWER COM 609839105 988,379 3,973 0.40 105,312 10.98 1.0491
2017-08-14 2017-06-30 13F MONOLITHIC POWER COM 609839105 984,406 11,856 1.22 94,897 5.94 0.9968
2017-05-15 2017-03-31 13F MONOLITHIC POWER COM 609839105 972,550 -14,299 -1.45 89,572 10.78 0.9555
2017-02-14 2016-12-31 13F MONOLITHIC POWER COM 609839105 986,849 -108,529 -9.91 80,853 -8.31 0.8828
2016-11-14 2016-09-30 13F MONOLITHIC POWER COM 609839105 1,095,378 -70,120 -6.02 88,178 10.74 0.9249
2016-08-15 2016-06-30 13F MONOLITHIC POWER COM 609839105 1,165,498 -15,563 -1.32 79,627 5.94 0.8640
2016-05-16 2016-03-31 13F MONOLITHIC POWER COM 609839105 1,181,061 -30,550 -2.52 75,163 -2.63 0.7876
2016-02-16 2015-12-31 13F MONOLITHIC POWER COM 609839105 1,211,611 -71,542 -5.58 77,192 17.50 0.7872
2015-11-16 2015-09-30 13F MONOLITHIC POWER COM 609839105 1,283,153 -417,820 -24.56 65,697 -23.83 0.6454
2015-08-14 2015-06-30 13F MONOLITHIC POWER COM 609839105 1,700,973 2,454 0.14 86,256 -3.55 0.7534
2015-05-15 2015-03-31 13F MONOLITHIC POWER COM 609839105 1,698,519 -156,178 -8.42 89,427 -3.06 0.7696
2015-02-17 2014-12-31 13F MONOLITHIC POWER COM 609839105 1,854,697 -131,695 -6.63 92,253 5.43 0.7571
2014-11-14 2014-09-30 13F Monolithic Power Systems COM 609839105 1,986,392 43,109 2.22 87,501 6.32 0.7316
2014-08-14 2014-06-30 13F MONOLITHIC POWER COM 609839105 1,943,283 -32,744 -1.66 82,298 7.42 0.6552
2014-05-15 2014-03-31 13F Monolithic Power Systems COM 609839105 1,976,027 -106,567 -5.12 76,611 6.13 0.6145
2014-02-14 2013-12-31 13F Monolithic Power Systems COM 609839105 2,082,594 2,082,594 72,183 0.5789
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.