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Sienna Gestion’s Costco COST Stock Holding History

Sienna Gestion’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 		$12.3M Buy
+12,872
New +$12.8M 0.72% 40
2025
Q3 		– Sell
-18,961
Closed -$17.1M – 167
2025
Q2 		$17.1M Buy
18,961
+1,807
+11% +$1.8M 1.18% 18
2025
Q1 		$15.8M Sell
17,154
-1,995
-10% -$1.95M 1.28% 12
2024
Q4 		$17.5M Hold
19,149
– – 1.18% 14
2024
Q3 		$16.9M Buy
19,149
+3,497
+22% +$3.04M 1.13% 15
2024
Q2 		$13.3M Buy
15,652
+645
+4% +$503K 1.18% 13
2024
Q1 		$11M Buy
+15,007
New +$10.7M 0.94% 27

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 $3.37T AUM 44.26% 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

Sienna Gestion's COST Position: Q2 2026 in Review

Sienna Gestion opened a new position in Costco (COST) in Q2 2026: 12,872 shares worth $12.3M. The stake represents 0.72% of the portfolio and ranks #40 among its holdings. This is a return to the name: Sienna Gestion previously reported a position in COST as recently as Q2 2025.

Sienna Gestion first reported a position in COST in Q1 2024 and has held it in 7 quarters since. The position peaked at $17.5M in Q4 2024. 4,252 funds tracked by Wall St. Rank hold COST as of Q2 2026.

  • Sienna Gestion held 12,872 shares of Costco worth $12.3M as of Q2 2026.
  • Costco was a new Sienna Gestion position in Q2 2026.
  • Costco made up 0.72% of Sienna Gestion's portfolio in Q2 2026, its #40 holding.
  • Sienna Gestion first reported a position in Costco in Q1 2024 and has held it in 7 quarters since.
  • Sienna Gestion's Costco position peaked at $17.5M in Q4 2024.
  • 4,252 funds tracked by Wall St. Rank held Costco as of Q2 2026.

Based on Sienna Gestion's 13F filing for Q2 2026, filed 13 Aug 2026.