William John Sempolinski
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William John Sempolinski’s Seagate STX Stock Holding History

William John Sempolinski’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
Q3 		$392K Sell
425
-250
-37% -$213K 0.15% 74
2026
Q2 		$651K Hold
675
– – 0.26% 65
2026
Q1 		$264K Buy
+675
New +$258K 0.13% 81

Other funds holding STX

BlackRock
BlackRock New York $6.79T AUM 37.06% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.76T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.27T AUM 50.62% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.84T AUM 33.86% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $704B AUM 26.74% 1-Year Est. Return
WCM Investment Management
WCM Investment Management Laguna Beach, California $59.1B AUM 41.96% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.21T AUM

William John Sempolinski's STX Position: Q3 2026 in Review

William John Sempolinski reduced its Seagate (STX) stake by 37% in Q3 2026, selling an estimated $213K and leaving 425 shares worth $392K. The position accounts for 0.15% of the portfolio, ranked #74.

William John Sempolinski first reported a position in STX in Q1 2026 and has held it in 3 quarters since. The position peaked at $651K in Q2 2026. 1,666 funds tracked by Wall St. Rank hold STX as of Q3 2026.

  • William John Sempolinski held 425 shares of Seagate worth $392K as of Q3 2026.
  • William John Sempolinski sold 250 Seagate shares in Q3 2026, an estimated $213K.
  • Seagate made up 0.15% of William John Sempolinski's portfolio in Q3 2026, its #74 holding.
  • William John Sempolinski first reported a position in Seagate in Q1 2026 and has held it in 3 quarters since.
  • William John Sempolinski's Seagate position peaked at $651K in Q2 2026.
  • 1,666 funds tracked by Wall St. Rank held Seagate as of Q3 2026.

Based on William John Sempolinski's 13F filing for Q3 2026, filed 20 Oct 2026.