Utah Retirement Systems reports 1.49% decrease in ownership of MPWR / Monolithic Power Systems, Inc.

Monolithic Power Systems, Inc.

MX ˙ BMV ˙ US6098391054

Security	MX:MPWR / Monolithic Power Systems, Inc.
Institution	Utah Retirement Systems
Latest Disclosed Ownership	7,525 shares
Latest Disclosed Value	$ 8,227,458

On May 15, 2026 - Utah Retirement Systems filed a 13F-HR form disclosing ownership of 7,525 shares of Monolithic Power Systems, Inc. (MX:MPWR) valued at $8,227,458 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 7,639 shares of Monolithic Power Systems, Inc.. This represents a change in shares of -1.49% 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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-15	2026-03-31	13F	MONOLITHIC PWR SYS	COM	609839105	7,525	-114	-1.49	8,227	18.84	0.0841
2026-02-17	2025-12-31	13F	MONOLITHIC PWR SYS	COM	609839105	7,639	0	0.00	6,924	-1.55	0.0659
2025-11-14	2025-09-30	13F	MONOLITHIC PWR SYS	COM	609839105	7,639	-50	-0.65	7,033	25.06	0.0683
2025-08-14	2025-06-30	13F	MONOLITHIC PWR SYS	COM	609839105	7,689	-70	-0.90	5,624	24.96	0.0587
2025-05-15	2025-03-31	13F	MONOLITHIC PWR SYS	COM	609839105	7,759	0	0.00	4,500	-1.98	0.0519
2025-02-14	2024-12-31	13F	MONOLITHIC PWR SYS	COM	609839105	7,759	0	0.00	4,591	-36.00	0.0506
2024-11-14	2024-09-30	13F	MONOLITHIC PWR SYS	COM	609839105	7,759	29	0.38	7,173	12.94	0.0809
2024-08-14	2024-06-30	13F	MONOLITHIC PWR SYS	COM	609839105	7,730	-257	-3.22	6,352	17.39	0.0754
2024-05-15	2024-03-31	13F	MONOLITHIC PWR SYS	COM	609839105	7,987	0	0.00	5,411	7.38	0.0633
2024-02-14	2023-12-31	13F	MONOLITHIC PWR SYS	COM	609839105	7,987	173	2.21	5,038	39.56	0.0642
2023-11-14	2023-09-30	13F	MONOLITHIC PWR SYS	COM	609839105	7,814	22	0.28	3,610	-14.23	0.0516
2023-08-14	2023-06-30	13F	MONOLITHIC PWR SYS	COM	609839105	7,792	-336	-4.13	4,209	3.47	0.0584
2023-05-16	2023-03-31	13F	MONOLITHIC PWR SYS	COM	609839105	8,128	50	0.62	4,068	42.44	0.0588
2023-02-15	2022-12-31	13F	MONOLITHIC PWR SYS	COM	609839105	8,078	-72	-0.88	2,856	-3.58	0.0453
2022-11-14	2022-09-30	13F	MONOLITHIC PWR SYS	COM	609839105	8,150	24	0.30	2,962	-5.09	0.0494
2022-08-16	2022-06-30	13F	MONOLITHIC PWR SYS	COM	609839105	8,126	0	0.00	3,121	-20.93	0.0500
2022-05-13	2022-03-31	13F	MONOLITHIC PWR SYS	COM	609839105	8,126	31	0.38	3,947	-1.18	0.0525
2022-02-14	2021-12-31	13F	MONOLITHIC PWR SYS	COM	609839105	8,095	39	0.48	3,994	2.28	0.0494
2021-11-16	2021-09-30	13F	MONOLITHIC PWR SYS	COM	609839105	8,056	-500	-5.84	3,905	22.22	0.0528
2021-08-16	2021-06-30	13F	MONOLITHIC PWR SYS	COM	609839105	8,556	260	3.13	3,195	9.04	0.0411
2021-05-17	2021-03-31	13F	MONOLITHIC PWR SYS	COM	609839105	8,296	-400	-4.60	2,930	-7.98	0.0408
2021-02-16	2020-12-31	13F	MONOLITHIC PWR SYS	COM	609839105	8,696	354	4.24	3,184	36.54	0.0452
2020-11-16	2020-09-30	13F	MONOLITHIC PWR SYS	COM	609839105	8,342	100	1.21	2,332	19.34	0.0387
2020-08-13	2020-06-30	13F/A-1	MONOLITHIC PWR SYS	COM	609839105	8,242	200	2.49	1,954	45.17	0.0359
2020-08-13	2020-06-30	13F	MONOLITHIC PWR SYS	COM	609839105	8,242	200		1,954		35,863.8056
2020-05-15	2020-03-31	13F	MONOLITHIC PWR SYS	COM	609839105	8,042	0	0.00	1,346	-5.94	0.0291
2020-02-12	2019-12-31	13F	MONOLITHIC PWR SYS	COM	609839105	8,042	100	1.26	1,431	15.78	0.0252
2019-11-14	2019-09-30	13F	MONOLITHIC PWR SYS	COM	609839105	7,942	100	1.28	1,236	16.06	0.0235
2019-08-14	2019-06-30	13F	MONOLITHIC PWR SYS	COM	609839105	7,842	197	2.58	1,065	2.90	0.0204
2019-05-15	2019-03-31	13F	MONOLITHIC PWR SYS	COM	609839105	7,645	45	0.59	1,035	17.08	0.0205
2019-02-08	2018-12-31	13F	MONOLITHIC PWR SYS	COM	609839105	7,600	0	0.00	884	-7.34	0.0200
2018-11-13	2018-09-30	13F	MONOLITHIC PWR SYS	COM	609839105	7,600	100	1.33	954	-4.79	0.0185
2018-08-10	2018-06-30	13F	MONOLITHIC PWR SYS	COM	609839105	7,500	7,500		1,002		0.0207

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.