Simplex Trading
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Simplex Trading’s Monolithic Power Systems MPWR Stock Holding History

Simplex Trading’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
2026
Q1 		$2.51M Sell
2,300
-3,300
-59% -$3.61M ﹤0.01% 1639
2025
Q4 		$5.08M Sell
5,600
-3,300
-37% -$3.18M ﹤0.01% 1250
2025
Q3 		$8.19M Buy
8,900
+3,300
+59% +$2.68M ﹤0.01% 1100
2025
Q2 		$4.09M Sell
5,600
-1,900
-25% -$1.21M ﹤0.01% 1516
2025
Q1 		$4.35M Sell
7,500
-13,900
-65% -$8.76M ﹤0.01% 1401
2024
Q4 		$12.7M Buy
21,400
+16,600
+346% +$12M 0.01% 890
2024
Q3 		$4.44M Sell
4,800
-12,000
-71% -$10.4M ﹤0.01% 1592
2024
Q2 		$13.8M Sell
16,800
-12,200
-42% -$8.8M 0.01% 801
2024
Q1 		$19.6M Buy
29,000
+10,900
+60% +$7.28M 0.01% 703
2023
Q4 		$11.4M Buy
18,100
+300
+2% +$157K 0.01% 1003
2023
Q3 		$8.22M Buy
17,800
+5,500
+45% +$2.81M 0.01% 1017
2023
Q2 		$6.64M Buy
12,300
+700
+6% +$333K 0.01% 1133
2023
Q1 		$5.81M Buy
11,600
+5,600
+93% +$2.57M 0.01% 1206
2022
Q4 		$2.12M Buy
6,000
+4,300
+253% +$1.54M ﹤0.01% 1821
2022
Q3 		$617K Sell
1,700
-6,800
-80% -$3.02M ﹤0.01% 3218
2022
Q2 		$3.26M Sell
8,500
-8,700
-51% -$3.67M ﹤0.01% 1429
2022
Q1 		$8.35M Buy
17,200
+16,500
+2,357% +$7.19M 0.01% 925
2021
Q4 		$345K Sell
700
-2,700
-79% -$1.39M ﹤0.01% 4351
2021
Q3 		$1.26M Hold
3,400
– – ﹤0.01% 2761
2021
Q2 		$1.27M Buy
3,400
+3,359
+8,193% +$1.18M ﹤0.01% 2785
2021
Q1 		$1.45M Buy
41
+40
+4,000% +$14.6K ﹤0.01% 1985
2020
Q4 		$36K Hold
1
– – ﹤0.01% 6496
2020
Q3 		$27K Sell
1
-24
-96% -$6.25K ﹤0.01% 6160
2020
Q2 		$592K Sell
25
-7
-22% -$1.42K ﹤0.01% 2708
2020
Q1 		$535K Sell
32
-9
-22% -$1.54K ﹤0.01% 2515
2019
Q4 		$729K Sell
41
-39
-49% -$6.23K ﹤0.01% 2373
2019
Q3 		$1.25M Buy
80
+47
+142% +$7.03K ﹤0.01% 1733
2019
Q2 		$448K Sell
33
-251
-88% -$34.1K ﹤0.01% 2670
2019
Q1 		$3.85M Buy
284
+247
+668% +$32.4K 0.01% 857
2018
Q4 		$430K Sell
37
-43
-54% -$5.15K ﹤0.01% 2366
2018
Q3 		$1M Sell
80
-37
-32% -$5.16K ﹤0.01% 1883
2018
Q2 		$1.56M Buy
+117
New +$14.9K 0.01% 1357
2017
Q3 		– Sell
-57
Closed -$8K – 6346
2017
Q2 		$8K Buy
57
+32
+128% +$3.05K ﹤0.01% 4178
2017
Q1 		$4K Buy
25
+5
+25% +$443 ﹤0.01% 4786
2016
Q4 		$4K Sell
20
-36
-64% -$2.89K ﹤0.01% 4551
2016
Q3 		$5K Sell
56
-10
-15% -$739 ﹤0.01% 4287
2016
Q2 		$11K Sell
66
-29
-31% -$1.9K ﹤0.01% 3516
2016
Q1 		$22K Buy
95
+75
+375% +$4.47K ﹤0.01% 2716
2015
Q4 		$1K Buy
+20
New +$1.24K ﹤0.01% 4924

Other funds holding MPWR

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
Franklin Resources
Franklin Resources San Mateo, California $408B AUM 30.18% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return

Simplex Trading's MPWR Position: Q4 2025 in Review

Simplex Trading sold out of Monolithic Power Systems (MPWR) in Q4 2025, closing a stake of 710 shares — an estimated $683K sold.

Simplex Trading first reported a position in MPWR in Q1 2015 and held it in 21 quarters. The position peaked at $2.67M in Q2 2023. 1,059 funds tracked by Wall St. Rank hold MPWR as of Q4 2025.

  • Simplex Trading reported no remaining Monolithic Power Systems position as of Q4 2025 after selling out during the quarter.
  • Simplex Trading sold 710 Monolithic Power Systems shares in Q4 2025, an estimated $683K.
  • Simplex Trading first reported a position in Monolithic Power Systems in Q1 2015 and held it in 21 quarters.
  • Simplex Trading's Monolithic Power Systems position peaked at $2.67M in Q2 2023.
  • 1,059 funds tracked by Wall St. Rank held Monolithic Power Systems as of Q4 2025.

Based on Simplex Trading's 13F filing for Q4 2025, filed 11 Feb 2026.