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 		$39.3M Buy
+100,200
New +$38.2M 0.03% 273
2025
Q4 		– Sell
-235,200
Closed -$55.5M – 10005
2025
Q3 		$55.5M Buy
235,200
+87,200
+59% +$14.9M 0.03% 329
2025
Q2 		$21.4M Sell
148,000
-133,300
-47% -$13.8M 0.01% 535
2025
Q1 		$23.9M Buy
281,300
+187,800
+201% +$17.7M 0.02% 462
2024
Q4 		$8.07M Sell
93,500
-61,400
-40% -$6.18M ﹤0.01% 1167
2024
Q3 		$17M Buy
154,900
+24,200
+19% +$2.47M 0.01% 732
2024
Q2 		$13.5M Sell
130,700
-246,600
-65% -$23M 0.01% 819
2024
Q1 		$35.1M Buy
377,300
+262,600
+229% +$23.1M 0.02% 454
2023
Q4 		$9.79M Sell
114,700
-159,400
-58% -$11.9M 0.01% 1101
2023
Q3 		$18.1M Sell
274,100
-10,200
-4% -$657K 0.01% 635
2023
Q2 		$17.6M Hold
284,300
– – 0.01% 638
2023
Q1 		$18.8M Sell
284,300
-6,000
-2% -$382K 0.02% 614
2022
Q4 		$15.3M Buy
290,300
+167,200
+136% +$8.89M 0.02% 661
2022
Q3 		$6.55M Sell
123,100
-48,800
-28% -$3.53M 0.01% 1030
2022
Q2 		$12.3M Buy
171,900
+10,500
+7% +$853K 0.01% 726
2022
Q1 		$14.5M Buy
161,400
+29,100
+22% +$2.98M 0.01% 656
2021
Q4 		$14.9M Sell
132,300
-206,300
-61% -$20M 0.02% 615
2021
Q3 		$29.3M Buy
338,600
+10,800
+3% +$940K 0.03% 352
2021
Q2 		$28.8M Buy
+327,800
New +$29.5M 0.03% 346
2021
Q1 		– Sell
-1,475
Closed -$9.17M – 9976
2020
Q4 		$9.17M Buy
1,475
+54
+4% +$3.04K 0.01% 627
2020
Q3 		$7M Sell
1,421
-338
-19% -$15.9K 0.01% 681
2020
Q2 		$8.52M Buy
1,759
+286
+19% +$14.4K 0.01% 582
2020
Q1 		$7.19M Buy
1,473
+555
+60% +$29.6K 0.01% 530
2019
Q4 		$5.46M Sell
918
-996
-52% -$57.2K 0.01% 747
2019
Q3 		$10.3M Buy
1,914
+652
+52% +$32K 0.03% 408
2019
Q2 		$5.95M Buy
1,262
+301
+31% +$14K 0.02% 595
2019
Q1 		$4.6M Sell
961
-1,071
-53% -$47.5K 0.01% 738
2018
Q4 		$7.84M Buy
2,032
+952
+88% +$40.1K 0.02% 410
2018
Q3 		$5.11M Buy
1,080
+371
+52% +$19.8K 0.02% 609
2018
Q2 		$4M Sell
709
-685
-49% -$39.6K 0.02% 668
2018
Q1 		$713K Buy
1,394
+205
+17% +$10.9K 0.03% 536
2017
Q4 		$231K Sell
1,189
-2,277
-66% -$87K 0.01% 1174
2017
Q3 		$280K Sell
3,466
-22
-0.6% -$747 0.01% 993
2017
Q2 		$181K Buy
3,488
+2,420
+227% +$106K 0.01% 1258
2017
Q1 		$382K Sell
1,068
-582
-35% -$25.8K 0.02% 830
2016
Q4 		$376K Sell
1,650
-531
-24% -$19.8K 0.02% 686
2016
Q3 		$645K Buy
2,181
+1,282
+143% +$41.6K 0.04% 401
2016
Q2 		$120K Buy
899
+106
+13% +$2.57K 0.01% 1350
2016
Q1 		$174K Buy
793
+492
+163% +$15.9K 0.01% 963
2015
Q4 		$45K Sell
301
-361
-55% -$13.7K ﹤0.01% 2002
2015
Q3 		$29K Buy
662
+594
+874% +$28.7K ﹤0.01% 2431
2015
Q2 		$9K Sell
68
-154
-69% -$8.5K ﹤0.01% 3176
2015
Q1 		$11K Buy
+222
New +$13.2K ﹤0.01% 2890

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.