Simplex Trading
MPWR icon

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
Q3 		$839K Buy
+623
New +$816K ﹤0.01% 2942
2025
Q4 		– Sell
-710
Closed -$683K – 9490
2025
Q3 		$653K Buy
710
+370
+109% +$300K ﹤0.01% 3511
2025
Q2 		$248K Sell
340
-811
-70% -$517K ﹤0.01% 4271
2025
Q1 		$667K Buy
+1,151
New +$725K ﹤0.01% 3084
2023
Q4 		– Sell
-1,573
Closed -$822K – 9437
2023
Q3 		$726K Sell
1,573
-3,378
-68% -$1.73M ﹤0.01% 3007
2023
Q2 		$2.67M Buy
4,951
+4,615
+1,374% +$2.19M ﹤0.01% 1738
2023
Q1 		$168K Buy
+336
New +$154K ﹤0.01% 4524
2021
Q2 		– Sell
-44
Closed -$15.5K – 10446
2021
Q1 		$15K Sell
44
-2,305
-98% -$839K ﹤0.01% 7667
2020
Q4 		$860K Buy
+2,349
New +$753K ﹤0.01% 2752
2020
Q1 		– Sell
-768
Closed -$132K – 8002
2019
Q4 		$136K Buy
+768
New +$123K ﹤0.01% 4169
2019
Q3 		– Sell
-2,418
Closed -$362K – 7648
2019
Q2 		$328K Buy
+2,418
New +$329K ﹤0.01% 2976
2018
Q3 		– Sell
-9
Closed -$1.25K – 7799
2018
Q2 		$1K Sell
9
-368
-98% -$46.9K ﹤0.01% 7172
2018
Q1 		$43K Sell
377
-537
-59% -$63.6K ﹤0.01% 2583
2017
Q4 		$102K Buy
+914
New +$106K ﹤0.01% 1787
2017
Q3 		– Sell
-1,764
Closed -$179K – 6345
2017
Q2 		$170K Buy
+1,764
New +$168K 0.01% 1303
2017
Q1 		– Sell
-229
Closed -$20.3K – 6543
2016
Q4 		$18K Sell
229
-2,525
-92% -$203K ﹤0.01% 3131
2016
Q3 		$221K Buy
2,754
+2,420
+725% +$179K 0.02% 962
2016
Q2 		$22K Sell
334
-1,522
-82% -$100K ﹤0.01% 2816
2016
Q1 		$118K Buy
1,856
+444
+31% +$26.5K 0.01% 1219
2015
Q4 		$89K Buy
1,412
+539
+62% +$33.5K 0.01% 1449
2015
Q3 		$44K Buy
+873
New +$43.3K ﹤0.01% 2098
2015
Q2 		– Sell
-2,168
Closed -$114K – 5598
2015
Q1 		$114K Buy
+2,168
New +$109K 0.01% 1021

Other funds holding MPWR

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Barclays
Barclays London, United Kingdom $500B AUM 36.84% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $765B AUM 28.39% 1-Year Est. Return
VOYA Investment Management
VOYA Investment Management Atlanta, Georgia $109B AUM 51.53% 1-Year Est. Return
Bank of New York Mellon
Bank of New York Mellon New York $608B AUM 32.77% 1-Year Est. Return
Amundi
Amundi Paris, France $496B AUM 35.36% 1-Year Est. Return
Fidelity International
Fidelity International Hamilton, Bermuda $144B AUM 22.91% 1-Year Est. Return
Deutsche Bank
Deutsche Bank Frankfurt Am Main Ge, Germany $362B AUM 34.89% 1-Year Est. Return
Citigroup
Citigroup New York $308B AUM 40.94% 1-Year Est. Return

Simplex Trading's MPWR Position: Q3 2026 in Review

Simplex Trading opened a new position in Monolithic Power Systems (MPWR) in Q3 2026: 623 shares worth $839K. The stake represents ﹤0.01% of the portfolio and ranks #2942 among its holdings. This is a return to the name: Simplex Trading previously reported a position in MPWR as recently as Q3 2025.

Simplex Trading first reported a position in MPWR in Q1 2015 and has held it in 22 quarters since. The position peaked at $2.67M in Q2 2023. 763 funds tracked by Wall St. Rank hold MPWR as of Q3 2026.

  • Simplex Trading held 623 shares of Monolithic Power Systems worth $839K as of Q3 2026.
  • Monolithic Power Systems was a new Simplex Trading position in Q3 2026.
  • Monolithic Power Systems made up ﹤0.01% of Simplex Trading's portfolio in Q3 2026, its #2942 holding.
  • Simplex Trading first reported a position in Monolithic Power Systems in Q1 2015 and has held it in 22 quarters since.
  • Simplex Trading's Monolithic Power Systems position peaked at $2.67M in Q2 2023.
  • 763 funds tracked by Wall St. Rank held Monolithic Power Systems as of Q3 2026.

Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.