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 		$3.17M Sell
2,900
-2,800
-49% -$3.06M ﹤0.01% 1455
2025
Q4 		$5.17M Buy
5,700
+2,300
+68% +$2.21M ﹤0.01% 1238
2025
Q3 		$3.13M Sell
3,400
-1,700
-33% -$1.38M ﹤0.01% 1889
2025
Q2 		$3.73M Sell
5,100
-5,600
-52% -$3.57M ﹤0.01% 1589
2025
Q1 		$6.21M Buy
10,700
+1,500
+16% +$945K ﹤0.01% 1168
2024
Q4 		$5.44M Buy
9,200
+3,800
+70% +$2.75M ﹤0.01% 1426
2024
Q3 		$4.99M Sell
5,400
-3,200
-37% -$2.76M ﹤0.01% 1491
2024
Q2 		$7.07M Sell
8,600
-4,100
-32% -$2.96M ﹤0.01% 1229
2024
Q1 		$8.6M Buy
12,700
+700
+6% +$467K 0.01% 1227
2023
Q4 		$7.57M Sell
12,000
-3,800
-24% -$1.99M ﹤0.01% 1274
2023
Q3 		$7.3M Sell
15,800
-16,100
-50% -$8.24M 0.01% 1102
2023
Q2 		$17.2M Buy
31,900
+28,600
+867% +$13.6M 0.01% 646
2023
Q1 		$1.65M Sell
3,300
-2,700
-45% -$1.24M ﹤0.01% 2107
2022
Q4 		$2.12M Sell
6,000
-7,400
-55% -$2.66M ﹤0.01% 1820
2022
Q3 		$4.87M Buy
13,400
+5,800
+76% +$2.58M 0.01% 1225
2022
Q2 		$2.92M Sell
7,600
-3,500
-32% -$1.48M ﹤0.01% 1523
2022
Q1 		$5.39M Sell
11,100
-5,100
-31% -$2.22M ﹤0.01% 1189
2021
Q4 		$7.99M Buy
16,200
+12,700
+363% +$6.55M 0.01% 913
2021
Q3 		$1.29M Hold
3,500
– – ﹤0.01% 2725
2021
Q2 		$1.31M Buy
3,500
+3,481
+18,321% +$1.23M ﹤0.01% 2743
2021
Q1 		$671K Sell
19
-24
-56% -$8.74K ﹤0.01% 2931
2020
Q4 		$1.57M Buy
43
+37
+617% +$11.9K ﹤0.01% 2019
2020
Q3 		$167K Sell
6
-11
-65% -$2.86K ﹤0.01% 4327
2020
Q2 		$402K Buy
17
+13
+325% +$2.63K ﹤0.01% 3172
2020
Q1 		$66K Sell
4
-2
-33% -$343 ﹤0.01% 4840
2019
Q4 		$106K Sell
6
-175
-97% -$27.9K ﹤0.01% 4457
2019
Q3 		$2.82M Buy
181
+180
+18,000% +$26.9K 0.01% 1065
2019
Q2 		$13K Sell
1
-53
-98% -$7.21K ﹤0.01% 5947
2019
Q1 		$731K Buy
+54
New +$7.09K ﹤0.01% 2268
2018
Q4 		– Sell
-6
Closed -$75K – 7516
2018
Q3 		$75K Sell
6
-9
-60% -$1.25K ﹤0.01% 4732
2018
Q2 		$200K Buy
+15
New +$1.91K ﹤0.01% 3487
2017
Q4 		– Sell
-23
Closed -$4K – 6407
2017
Q3 		$4K Buy
+23
New +$2.33K ﹤0.01% 4574
2017
Q2 		– Sell
-50
Closed -$17K – 6524
2017
Q1 		$17K Buy
50
+33
+194% +$2.92K ﹤0.01% 3420
2016
Q4 		$3K Sell
17
-13
-43% -$1.04K ﹤0.01% 4764
2016
Q3 		$7K Sell
30
-5
-14% -$369 ﹤0.01% 3954
2016
Q2 		$6K Buy
35
+31
+775% +$2.03K ﹤0.01% 4087
2016
Q1 		$2K Buy
+4
New +$238 ﹤0.01% 4751
2015
Q1 		– Sell
-9
Closed -$1K – 5345
2014
Q4 		$1K Buy
+9
New +$404 ﹤0.01% 4184

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.