Simplex Trading
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Simplex Trading’s Seagate STX Stock Holding History

Simplex Trading’s Portfolio STX Stock Details STX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$54.7M Buy
+139,600
New +$53.3M 0.04% 207
2025
Q4 		– Sell
-121,300
Closed -$28.6M – 10006
2025
Q3 		$28.6M Sell
121,300
-37,700
-24% -$6.43M 0.01% 502
2025
Q2 		$22.9M Sell
159,000
-24,000
-13% -$2.48M 0.01% 509
2025
Q1 		$15.5M Buy
183,000
+21,100
+13% +$1.99M 0.01% 641
2024
Q4 		$14M Sell
161,900
-65,700
-29% -$6.61M 0.01% 830
2024
Q3 		$24.9M Sell
227,600
-107,700
-32% -$11M 0.01% 553
2024
Q2 		$34.6M Buy
335,300
+91,400
+37% +$8.54M 0.02% 411
2024
Q1 		$22.7M Buy
243,900
+79,300
+48% +$6.97M 0.01% 632
2023
Q4 		$14.1M Buy
164,600
+35,300
+27% +$2.63M 0.01% 893
2023
Q3 		$8.53M Sell
129,300
-76,100
-37% -$4.9M 0.01% 1004
2023
Q2 		$12.7M Sell
205,400
-84,000
-29% -$5.13M 0.01% 763
2023
Q1 		$19.1M Buy
289,400
+42,300
+17% +$2.69M 0.02% 606
2022
Q4 		$13M Sell
247,100
-43,900
-15% -$2.33M 0.01% 740
2022
Q3 		$15.5M Buy
291,000
+105,500
+57% +$7.62M 0.02% 601
2022
Q2 		$13.3M Buy
185,500
+47,200
+34% +$3.83M 0.01% 684
2022
Q1 		$12.4M Buy
138,300
+48,200
+53% +$4.93M 0.01% 725
2021
Q4 		$10.2M Sell
90,100
-359,200
-80% -$34.9M 0.01% 777
2021
Q3 		$38.9M Buy
449,300
+12,400
+3% +$1.08M 0.04% 295
2021
Q2 		$38.4M Buy
+436,900
New +$39.4M 0.04% 292
2021
Q1 		– Sell
-578
Closed -$3.59M – 9977
2020
Q4 		$3.59M Sell
578
-42
-7% -$2.36K ﹤0.01% 1241
2020
Q3 		$3.05M Buy
620
+28
+5% +$1.32K ﹤0.01% 1192
2020
Q2 		$2.87M Sell
592
-259
-30% -$13K ﹤0.01% 1224
2020
Q1 		$4.15M Buy
851
+107
+14% +$5.71K 0.01% 797
2019
Q4 		$4.43M Sell
744
-1,376
-65% -$79K 0.01% 879
2019
Q3 		$11.4M Buy
2,120
+709
+50% +$34.8K 0.03% 380
2019
Q2 		$6.65M Buy
1,411
+728
+107% +$33.9K 0.02% 545
2019
Q1 		$3.27M Sell
683
-1,689
-71% -$74.9K 0.01% 973
2018
Q4 		$9.15M Buy
2,372
+984
+71% +$41.4K 0.03% 364
2018
Q3 		$6.57M Buy
1,388
+537
+63% +$28.7K 0.02% 497
2018
Q2 		$4.8M Sell
851
-635
-43% -$36.7K 0.02% 579
2018
Q1 		$58K Sell
1,486
-793
-35% -$42.2K ﹤0.01% 2296
2017
Q4 		$234K Sell
2,279
-369
-14% -$14.1K 0.01% 1168
2017
Q3 		$830K Sell
2,648
-850
-24% -$28.9K 0.03% 438
2017
Q2 		$959K Buy
3,498
+335
+11% +$14.6K 0.04% 377
2017
Q1 		$513K Buy
3,163
+1,662
+111% +$73.8K 0.02% 659
2016
Q4 		$193K Sell
1,501
-465
-24% -$17.4K 0.01% 1079
2016
Q3 		$122K Buy
1,966
+249
+15% +$8.08K 0.01% 1382
2016
Q2 		$373K Buy
1,717
+1,054
+159% +$25.6K 0.02% 667
2016
Q1 		$135K Buy
663
+346
+109% +$11.2K 0.01% 1130
2015
Q4 		$65K Sell
317
-59
-16% -$2.25K 0.01% 1712
2015
Q3 		$142K Sell
376
-29
-7% -$1.4K 0.01% 1140
2015
Q2 		$147K Buy
405
+134
+49% +$7.4K 0.01% 968
2015
Q1 		$145K Buy
+271
New +$16.1K 0.02% 875

Other funds holding STX

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Sanders Capital
Sanders Capital West Palm Beach, Florida $83.9B AUM 37.89% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Simplex Trading's STX Position: Q1 2026 in Review

Simplex Trading opened a new position in Seagate (STX) in Q1 2026: 2,599 shares worth $1.02M. The stake represents ﹤0.01% of the portfolio and ranks #2484 among its holdings. This is a return to the name: Simplex Trading previously reported a position in STX as recently as Q2 2025.

Simplex Trading first reported a position in STX in Q4 2014 and has held it in 20 quarters since. The position peaked at $8.77M in Q2 2024. 1,455 funds tracked by Wall St. Rank hold STX as of Q1 2026.

  • Simplex Trading held 2,599 shares of Seagate worth $1.02M as of Q1 2026.
  • Seagate was a new Simplex Trading position in Q1 2026.
  • Seagate made up ﹤0.01% of Simplex Trading's portfolio in Q1 2026, its #2484 holding.
  • Simplex Trading first reported a position in Seagate in Q4 2014 and has held it in 20 quarters since.
  • Simplex Trading's Seagate position peaked at $8.77M in Q2 2024.
  • 1,455 funds tracked by Wall St. Rank held Seagate as of Q1 2026.

Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.