Atom Investors’s Monolithic Power Systems MPWR Stock Holding History

Atom Investors’s Portfolio MPWR Stock Details MPWR Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q4	–	Sell	-271	Closed	-$249K	–	728
2025 Q3	$249K	Buy	+271	New	+$220K	0.02%	472
2024 Q4	–	Sell	-302	Closed	-$279K	–	585
2024 Q3	$279K	Buy	302 +1	+0.3%	+$863	0.03%	386
2024 Q2	$247K	Sell	301 -940	-76%	-$678K	0.02%	400
2024 Q1	$841K	Sell	1,241 -9	-0.7%	-$6.01K	0.1%	247
2023 Q4	$788K	Buy	+1,250	New	+$653K	0.14%	211
2022 Q2	–	Sell	-1,037	Closed	-$504K	–	295
2022 Q1	$504K	Buy	1,037 +344	+50%	+$150K	0.24%	97
2021 Q4	$342K	Sell	693 -3,045	-81%	-$1.57M	0.06%	188
2021 Q3	$1.81M	Sell	3,738 -3,116	-45%	-$1.42M	0.15%	79
2021 Q2	$2.56M	Buy	6,854 +4,313	+170%	+$1.52M	0.32%	58
2021 Q1	$898K	Buy	+2,541	New	+$925K	0.15%	116
2020 Q3	–	Sell	-4,342	Closed	-$1.03M	–	578
2020 Q2	$1.03M	Buy	+4,342	New	+$879K	0.07%	203
2019 Q4	–	Sell	-54,383	Closed	-$8.46M	–	280
2019 Q3	$8.46M	Buy	+54,383	New	+$8.13M	0.58%	53

Other funds holding MPWR

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Franklin Resources San Mateo, California $462B AUM 39.16% 1-Year Est. Return

Norges Bank Oslo, Norway $1T AUM

T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return

Atom Investors's MPWR Position: Q4 2025 in Review

Atom Investors sold out of Monolithic Power Systems (MPWR) in Q4 2025, closing a stake of 271 shares — an estimated $249K sold.

Atom Investors first reported a position in MPWR in Q3 2019 and held it in 12 quarters. The position peaked at $8.46M in Q3 2019. 1,061 funds tracked by Wall St. Rank hold MPWR as of Q4 2025.

Atom Investors reported no remaining Monolithic Power Systems position as of Q4 2025 after selling out during the quarter.
Atom Investors sold 271 Monolithic Power Systems shares in Q4 2025, an estimated $249K.
Atom Investors first reported a position in Monolithic Power Systems in Q3 2019 and held it in 12 quarters.
Atom Investors's Monolithic Power Systems position peaked at $8.46M in Q3 2019.
1,061 funds tracked by Wall St. Rank held Monolithic Power Systems as of Q4 2025.

Based on Atom Investors's 13F filing for Q4 2025, filed 17 Feb 2026.