Question 1

How many shares of MPWR does MASSACHUSETTS FINANCIAL SERVICES CO /MA/ own?

Accepted Answer

As of 2026-Q2, MASSACHUSETTS FINANCIAL SERVICES CO /MA/ holds 442,176 shares of MPWR (MONOLITHIC PWR SYS INC).

Question 2

What is MASSACHUSETTS FINANCIAL SERVICES CO /MA/'s MPWR position worth?

Accepted Answer

As of 2026-Q2, MASSACHUSETTS FINANCIAL SERVICES CO /MA/'s MPWR position is worth $611.2M.

Question 3

Is MASSACHUSETTS FINANCIAL SERVICES CO /MA/ buying or selling MPWR?

Accepted Answer

In 2026-Q2, MASSACHUSETTS FINANCIAL SERVICES CO /MA/ decreased their MPWR position (-22.1% change in shares).

Question 4

When did MASSACHUSETTS FINANCIAL SERVICES CO /MA/ first buy MPWR?

Accepted Answer

Based on available 13F filings, MASSACHUSETTS FINANCIAL SERVICES CO /MA/ first reported a position in MPWR in 2019-Q1. They have held the position across 30 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Decreased	442,176	-22.1%	$611.2M	0.2%	$1,380.32	0
2026-Q1	Decreased	567,769	-0.5%	$620.7M	0.2%	$1,090.07	0
2025-Q4	Increased	570,719	+2.5%	$517.3M	0.2%	$901.84	38
2025-Q3	Increased	556,587	+14.7%	$512.4M	0.2%	$914.50	43
2025-Q2	Increased	485,388	+6.1%	$355M	0.1%	$725.23	39
2025-Q1	Decreased	457,551	-6.3%	$265.4M	0.1%	$573.88	0
2024-Q4	Decreased	488,300	-28.0%	$288.9M	0.1%	$583.90	0
2024-Q3	Decreased	678,093	-28.0%	$626.9M	0.2%	$910.43	0
2024-Q2	Decreased	941,376	-4.4%	$773.5M	0.2%	$808.08	0
2024-Q1	Decreased	985,041	-6.7%	$667.3M	0.2%	$665.18	0
2023-Q4	Increased	1.1M	+0.3%	$666.2M	0.2%	$618.22	38
2023-Q3	Decreased	1.1M	-3.5%	$486.5M	0.2%	$452.09	0
2023-Q2	Decreased	1.1M	-3.5%	$589.5M	0.2%	$527.44	0
2023-Q1	Increased	1.1M	+1.0%	$566.1M	0.2%	$487.77	38
2022-Q4	Decreased	1.1M	-12.3%	$396M	0.1%	$343.88	0
2022-Q3	Increased	1.3M	+0.3%	$464M	0.2%	$352.63	37
2022-Q2	Increased	1.3M	+12.7%	$489M	0.2%	$371.92	42
2022-Q1	Decreased	1.1M	-1.3%	$548.8M	0.2%	$469.46	0
2021-Q4	Decreased	1.1M	-6.2%	$564.7M	0.2%	$476.16	0
2021-Q3	Decreased	1.2M	-0.9%	$591.5M	0.2%	$467.25	0
2021-Q2	Decreased	1.2M	-1.3%	$460M	0.1%	$359.58	0
2021-Q1	Increased	1.2M	+1.9%	$441M	0.1%	$339.54	38
2020-Q4	Decreased	1.2M	-2.4%	$448.8M	0.1%	$351.44	0
2020-Q3	Increased	1.3M	+2.9%	$351.2M	0.1%	$267.94	38
2020-Q2	Increased	1.2M	+15.3%	$289.4M	0.1%	$226.69	42
2020-Q1	Decreased	1.1M	-7.0%	$177.3M	0.1%	$159.82	0
2019-Q4	Increased	1.1M	+19.7%	$202.7M	0.1%	$169.38	36
2019-Q3	Increased	951,482	+7.9%	$148.1M	0.1%	$147.74	33
2019-Q2	Increased	881,860	+24.2%	$119.7M	0.0%	$128.58	37
2019-Q1	First report	710,071	-	$96.2M	0.0%	$127.90	0

MPWR30 quarters

MPWR
30 quarters