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William John Sempolinski’s Costco COST Stock Holding History

William John Sempolinski’s Portfolio COST Stock Details COST Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$327K Hold
350
– – 0.13% 85
2026
Q1 		$349K Buy
350
+50
+17% +$48.7K 0.18% 70
2025
Q4 		$259K Buy
+300
New +$272K 0.13% 73

Other funds holding COST

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return
Norges Bank
Norges Bank Oslo, Norway $1T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

William John Sempolinski's COST Position: Q2 2026 in Review

William John Sempolinski held its Costco (COST) position steady in Q2 2026 at 350 shares worth $327K. The position accounts for 0.13% of the portfolio, ranked #85.

William John Sempolinski first reported a position in COST in Q4 2025 and has held it in 3 quarters since. The position peaked at $349K in Q1 2026. 4,259 funds tracked by Wall St. Rank hold COST as of Q2 2026.

  • William John Sempolinski held 350 shares of Costco worth $327K as of Q2 2026.
  • William John Sempolinski left its Costco share count unchanged in Q2 2026.
  • Costco made up 0.13% of William John Sempolinski's portfolio in Q2 2026, its #85 holding.
  • William John Sempolinski first reported a position in Costco in Q4 2025 and has held it in 3 quarters since.
  • William John Sempolinski's Costco position peaked at $349K in Q1 2026.
  • 4,259 funds tracked by Wall St. Rank held Costco as of Q2 2026.

Based on William John Sempolinski's 13F filing for Q2 2026, filed 14 Aug 2026.